What changed?

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-This optional parameter specifies a shell command that will be executed at every restartpoint. The purpose of archive_cleanup_command is to provide a mechanism for cleaning up old archived WAL files that are no longer needed by the standby server. Any %r is replaced by the name of the file containing the last valid restart point. That is the earliest file that must be kept to allow a restore to be restartable, and so all files earlier than %r may be safely removed. This information can be used to truncate the archive to just the minimum required to support restart from the current restore. The pg_archivecleanup module is often used in archive_cleanup_command for single-standby configurations, for example: archive_cleanup_command = 'pg_archivecleanup /mnt/server/archivedir %r' Note however that if multiple standby servers are restoring from the same archive directory, you will need to ensure that you do not delete WAL files until they are no longer needed by any of the servers. archive_cleanup_command would typically be used in a warm-standby configuration (see Section 26.2). Write %% to embed an actual % character in the command. If the command returns a nonzero exit status then a warning log message will be written. An exception is that if the command was terminated by a signal or an error by the shell (such as command not found), a fatal error will be raised. This parameter can only be set in the postgresql.conf file or on the server command line.
+This optional parameter specifies a shell command that will be executed at every restartpoint. The purpose of archive_cleanup_command is to provide a mechanism for cleaning up old archived WAL files that are no longer needed by the standby server. Any %r is replaced by the name of the file containing the last valid restartpoint. That is the earliest file that must be kept to allow a restore to be restartable, and so all files earlier than %r may be safely removed. This information can be used to truncate the archive to just the minimum required to support restart from the current restore. The pg_archivecleanup module is often used in archive_cleanup_command for single-standby configurations, for example: archive_cleanup_command = 'pg_archivecleanup /mnt/server/archivedir "%r"' Note however that if multiple standby servers are restoring from the same archive directory, you will need to ensure that you do not delete WAL files until they are no longer needed by any of the servers. archive_cleanup_command would typically be used in a warm-standby configuration (see Section 26.2). Write %% to embed an actual % character in the command. If the command returns a nonzero exit status then a warning log message will be written. An exception is that if the command was terminated by a signal or an error by the shell (such as command not found), a fatal error will be raised. This parameter can only be set in the postgresql.conf file or on the server command line.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: ['always', 'on', 'off']
 
-When archive_mode is enabled, completed WAL segments are sent to archive storage by setting archive_command or archive_library. In addition to off, to disable, there are two modes: on, and always. During normal operation, there is no difference between the two modes, but when set to always the WAL archiver is enabled also during archive recovery or standby mode. In always mode, all files restored from the archive or streamed with streaming replication will be archived (again). See Section 26.2.9 for details. archive_mode is a separate setting from archive_command and archive_library so that archive_command and archive_library can be changed without leaving archiving mode. This parameter can only be set at server start. archive_mode cannot be enabled when wal_level is set to minimal.
+When archive_mode is enabled, completed WAL segments are sent to archive storage by setting archive_command or archive_library. In addition to off, to disable, there are two modes: on, and always. During normal operation, there is no difference between the two modes, but when set to always the WAL archiver is enabled also during archive recovery or standby mode. In always mode, all files restored from the archive or streamed with streaming physical replication will be archived (again). See Section 26.2.10 for details. archive_mode is a separate setting from archive_command and archive_library so that archive_command and archive_library can be changed without leaving archiving mode. This parameter can only be set at server start. archive_mode cannot be enabled when wal_level is set to minimal.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: s
 enumvals: None
 
-The archive_command or archive_library is only invoked for completed WAL segments. Hence, if your server generates little WAL traffic (or has slack periods where it does so), there could be a long delay between the completion of a transaction and its safe recording in archive storage. To limit how old unarchived data can be, you can set archive_timeout to force the server to switch to a new WAL segment file periodically. When this parameter is greater than zero, the server will switch to a new segment file whenever this amount of time has elapsed since the last segment file switch, and there has been any database activity, including a single checkpoint (checkpoints are skipped if there is no database activity). Note that archived files that are closed early due to a forced switch are still the same length as completely full files. Therefore, it is unwise to use a very short archive_timeout — it will bloat your archive storage. archive_timeout settings of a minute or so are usually reasonable. You should consider using streaming replication, instead of archiving, if you want data to be copied off the primary server more quickly than that. If this value is specified without units, it is taken as seconds. This parameter can only be set in the postgresql.conf file or on the server command line.
+The archive_command or archive_library is only invoked for completed WAL segments. Hence, if your server generates little WAL traffic (or has slack periods where it does so), there could be a long delay between the completion of a transaction and its safe recording in archive storage. To limit how old unarchived data can be, you can set archive_timeout to force the server to switch to a new WAL segment file periodically. When this parameter is greater than zero, the server will switch to a new segment file whenever this amount of time has elapsed since the last segment file switch, and there has been any database activity, including a single checkpoint (checkpoints are skipped if there is no database activity). Note that archived files that are closed early due to a forced switch are still the same length as completely full files. Therefore, it is unwise to use a very short archive_timeout — it will bloat your archive storage. archive_timeout settings of a minute or so are usually reasonable. You should consider using streaming physical replication, instead of archiving, if you want data to be copied off the primary server more quickly than that. If this value is specified without units, it is taken as seconds. This parameter can only be set in the postgresql.conf file or on the server command line.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: real
+context: sighup
+boot_val: 1
+unit: None
+enumvals: None
+
+Specifies the scaling factor of the analyze threshold component of the score used by autovacuum for prioritization purposes. The default is 1.0. This parameter can only be set in the postgresql.conf file or on the server command line. See Section 24.1.6.1 for more information.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: real
+context: sighup
+boot_val: 1
+unit: None
+enumvals: None
+
+Specifies the scaling factor of the transaction ID age component of the score used by autovacuum for prioritization purposes. The default is 1.0. This parameter can only be set in the postgresql.conf file or on the server command line. See Section 24.1.6.1 for more information.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: integer
+context: sighup
+boot_val: 0
+unit: None
+enumvals: None
+
+Sets the maximum number of parallel workers that can be used by a single autovacuum worker to process indexes. This limit applies specifically to the index vacuuming and index cleanup phases (for the details of each autovacuum phase, please refer to Table 27.51). The actual number of parallel workers is further limited by max_parallel_workers. This is the per-autovacuum worker equivalent of the PARALLEL option of the VACUUM command. Setting this value to 0 disables parallel vacuum during autovacuum. The default is 0.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: real
+context: sighup
+boot_val: 1
+unit: None
+enumvals: None
+
+Specifies the scaling factor of the multixact ID age component of the score used by autovacuum for prioritization purposes. The default is 1.0. This parameter can only be set in the postgresql.conf file or on the server command line. See Section 24.1.6.1 for more information.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: real
+context: sighup
+boot_val: 1
+unit: None
+enumvals: None
+
+Specifies the scaling factor of the vacuum insert threshold component of the score used by autovacuum for prioritization purposes. The default is 1.0. This parameter can only be set in the postgresql.conf file or on the server command line. See Section 24.1.6.1 for more information.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: real
+context: sighup
+boot_val: 1
+unit: None
+enumvals: None
+
+Specifies the scaling factor of the vacuum threshold component of the score used by autovacuum for prioritization purposes. The default is 1.0. This parameter can only be set in the postgresql.conf file or on the server command line. See Section 24.1.6.1 for more information.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: ['safe_encoding', 'on', 'off']
 
-This controls whether a quote mark can be represented by \' in a string literal. The preferred, SQL-standard way to represent a quote mark is by doubling it ('') but PostgreSQL has historically also accepted \'. However, use of \' creates security risks because in some client character set encodings, there are multibyte characters in which the last byte is numerically equivalent to ASCII \. If client-side code does escaping incorrectly then an SQL-injection attack is possible. This risk can be prevented by making the server reject queries in which a quote mark appears to be escaped by a backslash. The allowed values of backslash_quote are on (allow \' always), off (reject always), and safe_encoding (allow only if client encoding does not allow ASCII \ within a multibyte character). safe_encoding is the default setting. Note that in a standard-conforming string literal, \ just means \ anyway. This parameter only affects the handling of non-standard-conforming literals, including escape string syntax (E'...').
+This parameter controls whether a quote mark can be represented by \' in the escape string syntax (E'...'). The preferred, SQL-standard way to represent a quote mark is by doubling it ('') but PostgreSQL has historically also accepted \'. However, use of \' creates security risks because in some client character set encodings, there are multibyte characters in which the last byte is numerically equivalent to ASCII \. If client-side code does escaping incorrectly then an SQL-injection attack is possible. This risk can be prevented by making the server reject queries in which a quote mark appears to be escaped by a backslash. The allowed values of backslash_quote are on (allow \' always), off (reject always), and safe_encoding (allow only if client encoding does not allow ASCII \ within a multibyte character). safe_encoding is the default setting. Note that in an ordinary string literal, \ just means \ anyway. This parameter only affects the handling of escape string syntax.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: ['partition', 'on', 'off']
 
-Controls the query planner's use of table constraints to optimize queries. The allowed values of constraint_exclusion are on (examine constraints for all tables), off (never examine constraints), and partition (examine constraints only for inheritance child tables and UNION ALL subqueries). partition is the default setting. It is often used with traditional inheritance trees to improve performance. When this parameter allows it for a particular table, the planner compares query conditions with the table's CHECK constraints, and omits scanning tables for which the conditions contradict the constraints. For example: CREATE TABLE parent(key integer, ...); CREATE TABLE child1000(check (key between 1000 and 1999)) INHERITS(parent); CREATE TABLE child2000(check (key between 2000 and 2999)) INHERITS(parent); ... SELECT * FROM parent WHERE key = 2400; With constraint exclusion enabled, this SELECT will not scan child1000 at all, improving performance. Currently, constraint exclusion is enabled by default only for cases that are often used to implement table partitioning via inheritance trees. Turning it on for all tables imposes extra planning overhead that is quite noticeable on simple queries, and most often will yield no benefit for simple queries. If you have no tables that are partitioned using traditional inheritance, you might prefer to turn it off entirely. (Note that the equivalent feature for partitioned tables is controlled by a separate parameter, enable_partition_pruning.) Refer to Section 5.12.5 for more information on using constraint exclusion to implement partitioning.
+Controls the query planner's use of table constraints to optimize queries. The allowed values of constraint_exclusion are on (examine constraints for all tables), off (never examine constraints), and partition (examine constraints only for inheritance child tables and UNION ALL subqueries). partition is the default setting. It is often used with traditional inheritance trees to improve performance. When this parameter allows it for a particular table, the planner compares query conditions with the table's CHECK constraints, and omits scanning tables for which the conditions contradict the constraints. For example: CREATE TABLE parent(key integer, ...); CREATE TABLE child1000(CHECK (key BETWEEN 1000 AND 1999)) INHERITS(parent); CREATE TABLE child2000(CHECK (key BETWEEN 2000 AND 2999)) INHERITS(parent); ... SELECT * FROM parent WHERE key = 2400; With constraint exclusion enabled, this SELECT will not scan child1000 at all, improving performance. Currently, constraint exclusion is enabled by default only for cases that are often used to implement table partitioning via inheritance trees. Turning it on for all tables imposes extra planning overhead that is quite noticeable on simple queries, and most often will yield no benefit for simple queries. If you have no tables that are partitioned using traditional inheritance, you might prefer to turn it off entirely. (Note that the equivalent feature for partitioned tables is controlled by a separate parameter, enable_partition_pruning.) Refer to Section 5.13.5 for more information on using constraint exclusion to implement partitioning.

--- 18
+++ 19 beta 3
@@ -1,7 +1,7 @@
-vartype: bool
+vartype: enum
 context: internal
 boot_val: off
 unit: None
-enumvals: None
+enumvals: ['']
 
-Reports whether data checksums are enabled for this cluster. See -k for more information.
+Reports the state of data checksums for this cluster. Possible values are on, off, inprogress-on and inprogress-off. See Section 28.2 for more information.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: bool
+context: internal
+boot_val: off
+unit: None
+enumvals: None
+
+Reports whether PostgreSQL has been built with EXEC_BACKEND enabled. That is the case on Windows or if the macro EXEC_BACKEND is defined when PostgreSQL is built.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-When set, debug_pretty_print indents the messages produced by debug_print_parse, debug_print_rewritten, or debug_print_plan. This results in more readable but much longer output than the “compact” format used when it is off. It is on by default.
+When set, debug_pretty_print indents the messages produced by debug_print_raw_parse, debug_print_parse, debug_print_rewritten, or debug_print_plan. This results in more readable but much longer output than the “compact” format used when it is off. It is on by default.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-These parameters enable various debugging output to be emitted. When set, they print the resulting parse tree, the query rewriter output, or the execution plan for each executed query. These messages are emitted at LOG message level, so by default they will appear in the server log but will not be sent to the client. You can change that by adjusting client_min_messages and/or log_min_messages. These parameters are off by default.
+These parameters enable various debugging output to be emitted. When set, they print the resulting raw parse tree, the parse tree, the query rewriter output, or the execution plan for each executed query. These messages are emitted at LOG message level, so by default they will appear in the server log but will not be sent to the client. You can change that by adjusting client_min_messages and/or log_min_messages. These parameters are off by default.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-These parameters enable various debugging output to be emitted. When set, they print the resulting parse tree, the query rewriter output, or the execution plan for each executed query. These messages are emitted at LOG message level, so by default they will appear in the server log but will not be sent to the client. You can change that by adjusting client_min_messages and/or log_min_messages. These parameters are off by default.
+These parameters enable various debugging output to be emitted. When set, they print the resulting raw parse tree, the parse tree, the query rewriter output, or the execution plan for each executed query. These messages are emitted at LOG message level, so by default they will appear in the server log but will not be sent to the client. You can change that by adjusting client_min_messages and/or log_min_messages. These parameters are off by default.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: bool
+context: user
+boot_val: off
+unit: None
+enumvals: None
+
+These parameters enable various debugging output to be emitted. When set, they print the resulting raw parse tree, the parse tree, the query rewriter output, or the execution plan for each executed query. These messages are emitted at LOG message level, so by default they will appear in the server log but will not be sent to the client. You can change that by adjusting client_min_messages and/or log_min_messages. These parameters are off by default.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-These parameters enable various debugging output to be emitted. When set, they print the resulting parse tree, the query rewriter output, or the execution plan for each executed query. These messages are emitted at LOG message level, so by default they will appear in the server log but will not be sent to the client. You can change that by adjusting client_min_messages and/or log_min_messages. These parameters are off by default.
+These parameters enable various debugging output to be emitted. When set, they print the resulting raw parse tree, the parse tree, the query rewriter output, or the execution plan for each executed query. These messages are emitted at LOG message level, so by default they will appear in the server log but will not be sent to the client. You can change that by adjusting client_min_messages and/or log_min_messages. These parameters are off by default.

--- 18
+++ 19 beta 3
@@ -1,7 +1,7 @@
 vartype: enum
 context: user
-boot_val: pglz
+boot_val: lz4
 unit: None
 enumvals: ['pglz', 'lz4']
 
-This variable sets the default TOAST compression method for values of compressible columns. (This can be overridden for individual columns by setting the COMPRESSION column option in CREATE TABLE or ALTER TABLE.) The supported compression methods are pglz and (if PostgreSQL was compiled with --with-lz4) lz4. The default is pglz.
+This variable sets the default TOAST compression method for values of compressible columns. (This can be overridden for individual columns by setting the COMPRESSION column option in CREATE TABLE or ALTER TABLE.) The supported compression methods are pglz and (if PostgreSQL was compiled with --with-lz4) lz4. The default is lz4 (if available); otherwise, pglz.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: enum
+context: internal
+boot_val: replica
+unit: None
+enumvals: ['minimal', 'replica', 'logical']
+
+Reports the actual WAL logging level currently in effect in the system. This parameter shares the same set of values as wal_level, but reflects the operational WAL level rather than the configured setting. For descriptions of possible values, refer to the wal_level parameter documentation. The effective WAL level can differ from the configured wal_level in certain situations. For example, when wal_level is set to replica and the system has one or more logical replication slots, effective_wal_level will show logical to indicate that the system is maintaining WAL records at logical level equivalent. On standby servers, effective_wal_level matches the value of effective_wal_level from the most upstream server in the replication chain.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: bool
+context: user
+boot_val: on
+unit: None
+enumvals: None
+
+Enables or disables the query planner's ability to partially push aggregation past a join, and finalize it once all the relations are joined. The default is on.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-Enables or disables the query planner's ability to eliminate a partitioned table's partitions from query plans. This also controls the planner's ability to generate query plans which allow the query executor to remove (ignore) partitions during query execution. The default is on. See Section 5.12.4 for details.
+Enables or disables the query planner's ability to eliminate a partitioned table's partitions from query plans. This also controls the planner's ability to generate query plans which allow the query executor to remove (ignore) partitions during query execution. The default is on. See Section 5.13.4 for details.

--- 18
+++ 19 beta 3
@@ -1,7 +0,0 @@
-vartype: bool
-context: user
-boot_val: on
-unit: None
-enumvals: None
-
-When on, a warning is issued if a backslash (\) appears in an ordinary string literal ('...' syntax) and standard_conforming_strings is off. The default is on. Applications that wish to use backslash as escape should be modified to use escape string syntax (E'...'), because the default behavior of ordinary strings is now to treat backslash as an ordinary character, per SQL standard. This variable can be enabled to help locate code that needs to be changed.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: string
+context: postmaster
+boot_val: None
+unit: None
+enumvals: None
+
+Specifies the configuration file for host-based SSL configuration (customarily called pg_hosts.conf). This parameter can only be set at server start. See also Section 18.9.6.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: integer
+context: sighup
+boot_val: 8
+unit: None
+enumvals: None
+
+Sets the maximum number of I/O worker processes. The default is 8. This parameter can only be set in the postgresql.conf file or on the server command line. Only has an effect if io_method is set to worker.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: integer
+context: sighup
+boot_val: 2
+unit: None
+enumvals: None
+
+Sets the minimum number of I/O worker processes. The default is 2. This parameter can only be set in the postgresql.conf file or on the server command line. Only has an effect if io_method is set to worker.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: integer
+context: sighup
+boot_val: 60000
+unit: ms
+enumvals: None
+
+Sets the time after which entirely idle I/O worker processes exit, reducing the size of pool to match demand. The default is 1 minute. This parameter can only be set in the postgresql.conf file or on the server command line. Only has an effect if io_method is set to worker.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: integer
+context: sighup
+boot_val: 100
+unit: ms
+enumvals: None
+
+Sets the minimum time before another I/O worker can be launched. This avoids creating too many for an unsustained burst of activity. The default is 100ms. This parameter can only be set in the postgresql.conf file or on the server command line. Only has an effect if io_method is set to worker.

--- 18
+++ 19 beta 3
@@ -1,7 +0,0 @@
-vartype: integer
-context: sighup
-boot_val: 3
-unit: None
-enumvals: None
-
-Selects the number of I/O worker processes to use. The default is 3. This parameter can only be set in the postgresql.conf file or on the server command line. Only has an effect if io_method is set to worker.

--- 18
+++ 19 beta 3
@@ -1,7 +1,7 @@
 vartype: bool
 context: user
-boot_val: on
+boot_val: off
 unit: None
 enumvals: None
 
-Determines whether JIT compilation may be used by PostgreSQL, if available (see Chapter 30). The default is on.
+Determines whether JIT compilation may be used by PostgreSQL, if available (see Chapter 30). The default is off.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: integer
+context: sighup
+boot_val: 600000
+unit: ms
+enumvals: None
+
+Causes analyze action executed by autovacuum to be logged if it ran for at least the specified amount of time. Setting this to zero logs all analyze actions by autovacuum. -1 disables logging analyze actions by autovacuum. If this value is specified without units, it is taken as milliseconds. For example, if you set this to 250ms then all automatic analyzes that run 250ms or longer will be logged. In addition, when this parameter is set to any value other than -1, a message will be logged if an analyze action by autovacuum is skipped due to a conflicting lock or a concurrently dropped relation. The default is 10min. Enabling this parameter can be helpful in tracking analyze activity by autovacuum. This parameter can only be set in the postgresql.conf file or on the server command line; but the setting can be overridden for individual tables by changing table storage parameters.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: ms
 enumvals: None
 
-Causes each action executed by autovacuum to be logged if it ran for at least the specified amount of time. Setting this to zero logs all autovacuum actions. -1 disables logging autovacuum actions. If this value is specified without units, it is taken as milliseconds. For example, if you set this to 250ms then all automatic vacuums and analyzes that run 250ms or longer will be logged. In addition, when this parameter is set to any value other than -1, a message will be logged if an autovacuum action is skipped due to a conflicting lock or a concurrently dropped relation. The default is 10min. Enabling this parameter can be helpful in tracking autovacuum activity. This parameter can only be set in the postgresql.conf file or on the server command line; but the setting can be overridden for individual tables by changing table storage parameters.
+Causes vacuum action executed by autovacuum to be logged if it ran for at least the specified amount of time. Setting this to zero logs all vacuum actions by autovacuum. -1 disables logging vacuum actions by autovacuum. If this value is specified without units, it is taken as milliseconds. For example, if you set this to 250ms then all automatic vacuums that run 250ms or longer will be logged. In addition, when this parameter is set to any value other than -1, a message will be logged if a vacuum action by autovacuum is skipped due to a conflicting lock or a concurrently dropped relation. The default is 10min. Enabling this parameter can be helpful in tracking vacuum activity by autovacuum. This parameter can only be set in the postgresql.conf file or on the server command line; but the setting can be overridden for individual tables by changing table storage parameters.

--- 18
+++ 19 beta 3
@@ -1,7 +1,7 @@
 vartype: bool
 context: superuser
-boot_val: off
+boot_val: on
 unit: None
 enumvals: None
 
-Controls whether a log message is produced when a session waits longer than deadlock_timeout to acquire a lock. This is useful in determining if lock waits are causing poor performance. The default is off. Only superusers and users with the appropriate SET privilege can change this setting.
+Controls whether a log message is produced when a session waits longer than deadlock_timeout to acquire a lock. This is useful in determining if lock waits are causing poor performance. The default is on. Only superusers and users with the appropriate SET privilege can change this setting.

--- 18
+++ 19 beta 3
@@ -1,7 +1,7 @@
-vartype: enum
+vartype: string
 context: superuser
 boot_val: warning
 unit: None
-enumvals: ['debug5', 'debug4', 'debug3', 'debug2', 'debug1', 'info', 'notice', 'warning', 'error', 'log', 'fatal', 'panic']
+enumvals: None
 
-Controls which message levels are written to the server log. Valid values are DEBUG5, DEBUG4, DEBUG3, DEBUG2, DEBUG1, INFO, NOTICE, WARNING, ERROR, LOG, FATAL, and PANIC. Each level includes all the levels that follow it. The later the level, the fewer messages are sent to the log. The default is WARNING. Note that LOG has a different rank here than in client_min_messages. Only superusers and users with the appropriate SET privilege can change this setting.
+Controls which message levels are written to the server log. The value is a comma-separated list of zero or more process type:level entries and exactly one mandatory level entry, which becomes the default for process types not listed. Valid process types are listed in the table below. archiver bgwriter postmaster walreceiver autovacuum checkpointer slotsyncworker walsender backend checksums startup walsummarizer bgworker ioworker syslogger walwriter Valid level values are DEBUG5, DEBUG4, DEBUG3, DEBUG2, DEBUG1, INFO, NOTICE, WARNING, ERROR, LOG, FATAL, and PANIC. Each level includes all the levels that follow it. The later the level, the fewer messages are sent to the log. The default is WARNING, which applies that level to all process types. Note that LOG has a different rank here than in client_min_messages. Only superusers and users with the appropriate SET privilege can change this setting. Example: To log walsender and autovacuum at level DEBUG1 and everything else at ERROR, set log_min_messages to error, walsender:debug1, autovacuum:debug1.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: kB
 enumvals: None
 
-Specifies the maximum amount of memory to be used by logical decoding, before some of the decoded changes are written to local disk. This limits the amount of memory used by logical streaming replication connections. It defaults to 64 megabytes (64MB). Since each replication connection only uses a single buffer of this size, and an installation normally doesn't have many such connections concurrently (as limited by max_wal_senders), it's safe to set this value significantly higher than work_mem, reducing the amount of decoded changes written to disk.
+Specifies the maximum amount of memory to be used by logical decoding, before some of the decoded changes are written to local disk. This limits the amount of memory used by streaming logical replication connections. It defaults to 64 megabytes (64MB). Since each replication connection only uses a single buffer of this size, and an installation normally doesn't have many such connections concurrently (as limited by max_wal_senders), it's safe to set this value significantly higher than work_mem, reducing the amount of decoded changes written to disk.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-Sets the maximum number of open files each server subprocess is allowed to open simultaneously; files already opened in the postmaster are not counted toward this limit. The default is one thousand files. If the kernel is enforcing a safe per-process limit, you don't need to worry about this setting. But on some platforms (notably, most BSD systems), the kernel will allow individual processes to open many more files than the system can actually support if many processes all try to open that many files. If you find yourself seeing “Too many open files” failures, try reducing this setting. This parameter can only be set at server start.
+Sets the maximum number of files each server subprocess is allowed to have open simultaneously; files already opened in the postmaster are not counted toward this limit. The default is one thousand files. If the kernel is enforcing a safe per-process limit, you don't need to worry about this setting. But on some platforms (notably, most BSD systems), the kernel will allow individual processes to open many more files than the system can actually support if many processes all try to open that many files. If you find yourself seeing “Too many open files” failures, try reducing this setting. This parameter can only be set at server start.

--- 18
+++ 19 beta 3
@@ -1,7 +1,7 @@
 vartype: integer
 context: postmaster
-boot_val: 64
+boot_val: 128
 unit: None
 enumvals: None
 
-The shared lock table has space for max_locks_per_transaction objects (e.g., tables) per server process or prepared transaction; hence, no more than this many distinct objects can be locked at any one time. This parameter limits the average number of object locks used by each transaction; individual transactions can lock more objects as long as the locks of all transactions fit in the lock table. This is not the number of rows that can be locked; that value is unlimited. The default, 64, has historically proven sufficient, but you might need to raise this value if you have queries that touch many different tables in a single transaction, e.g., query of a parent table with many children. This parameter can only be set at server start. When running a standby server, you must set this parameter to have the same or higher value as on the primary server. Otherwise, queries will not be allowed in the standby server.
+The shared lock table has space for max_locks_per_transaction objects (e.g., tables) per server process or prepared transaction; hence, no more than this many distinct objects can be locked at any one time. This parameter limits the average number of object locks used by each transaction; individual transactions can lock more objects as long as the locks of all transactions fit in the lock table. This is not the number of rows that can be locked; that value is unlimited. The default, 128, has historically proven sufficient, but you might need to raise this value if you have queries that touch many different tables in a single transaction, e.g., query of a parent table with many children. This parameter can only be set at server start. When running a standby server, you must set this parameter to have the same or higher value as on the primary server. Otherwise, queries will not be allowed in the standby server.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-Specifies maximum number of logical replication workers. This includes leader apply workers, parallel apply workers, and table synchronization workers. Logical replication workers are taken from the pool defined by max_worker_processes. The default value is 4. This parameter can only be set at server start.
+Specifies maximum number of logical replication workers. This includes leader apply workers, parallel apply workers, and table/sequence synchronization workers. Logical replication workers are taken from the pool defined by max_worker_processes. The default value is 4. This parameter can only be set at server start.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: integer
+context: postmaster
+boot_val: 5
+unit: None
+enumvals: None
+
+Specifies the maximum number of replication slots for use of the REPACK command. The default is 5. This parameter can only be set at server start.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: ms
 enumvals: None
 
-When hot standby is active, this parameter determines how long the standby server should wait before canceling standby queries that conflict with about-to-be-applied WAL entries, as described in Section 26.4.2. max_standby_streaming_delay applies when WAL data is being received via streaming replication. If this value is specified without units, it is taken as milliseconds. The default is 30 seconds. A value of -1 allows the standby to wait forever for conflicting queries to complete. This parameter can only be set in the postgresql.conf file or on the server command line. Note that max_standby_streaming_delay is not the same as the maximum length of time a query can run before cancellation; rather it is the maximum total time allowed to apply WAL data once it has been received from the primary server. Thus, if one query has resulted in significant delay, subsequent conflicting queries will have much less grace time until the standby server has caught up again.
+When hot standby is active, this parameter determines how long the standby server should wait before canceling standby queries that conflict with about-to-be-applied WAL entries, as described in Section 26.4.2. max_standby_streaming_delay applies when WAL data is being received via streaming physical replication. If this value is specified without units, it is taken as milliseconds. The default is 30 seconds. A value of -1 allows the standby to wait forever for conflicting queries to complete. This parameter can only be set in the postgresql.conf file or on the server command line. Note that max_standby_streaming_delay is not the same as the maximum length of time a query can run before cancellation; rather it is the maximum total time allowed to apply WAL data once it has been received from the primary server. Thus, if one query has resulted in significant delay, subsequent conflicting queries will have much less grace time until the standby server has caught up again.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-Maximum number of synchronization workers per subscription. This parameter controls the amount of parallelism of the initial data copy during the subscription initialization or when new tables are added. Currently, there can be only one synchronization worker per table. The synchronization workers are taken from the pool defined by max_logical_replication_workers. The default value is 2. This parameter can only be set in the postgresql.conf file or on the server command line.
+Maximum number of synchronization workers per subscription. This parameter controls the amount of parallelism of the initial data copy for tables during the subscription initialization or when new tables are added. One additional worker is also needed for sequence synchronization. Currently, there can be only one table synchronization worker per table and one sequence synchronization worker to synchronize per subscription. The synchronization workers are taken from the pool defined by max_logical_replication_workers. The default value is 2. This parameter can only be set in the postgresql.conf file or on the server command line.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-Sets the maximum number of background processes that the cluster can support. This parameter can only be set at server start. The default is 8. When running a standby server, you must set this parameter to the same or higher value than on the primary server. Otherwise, queries will not be allowed in the standby server. When changing this value, consider also adjusting max_parallel_workers, max_parallel_maintenance_workers, and max_parallel_workers_per_gather.
+Sets the maximum number of background processes that the cluster can support. This parameter can only be set at server start. The default is 8. When running a standby server, you must set this parameter to the same or higher value than on the primary server. Otherwise, queries will not be allowed in the standby server. When changing this value, consider also adjusting max_parallel_workers, autovacuum_max_parallel_workers, max_parallel_maintenance_workers, and max_parallel_workers_per_gather.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-Controls whether a WARNING about MD5 password deprecation is produced when a CREATE ROLE or ALTER ROLE statement sets an MD5-encrypted password. The default value is on.
+Controls whether a WARNING about MD5 password deprecation is produced upon successful authentication using an MD5-encrypted password or when a CREATE ROLE or ALTER ROLE statement sets an MD5-encrypted password. The default value is on.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: real
+context: user
+boot_val: 8
+unit: None
+enumvals: None
+
+Sets the minimum average group size required to consider applying eager aggregation. This helps avoid the overhead of eager aggregation when it does not offer significant row count reduction. The default is 8.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-The library/libraries to use for validating OAuth connection tokens. If only one validator library is provided, it will be used by default for any OAuth connections; otherwise, all oauth HBA entries must explicitly set a validator chosen from this list. If set to an empty string (the default), OAuth connections will be refused. This parameter can only be set in the postgresql.conf file. Validator modules must be implemented/obtained separately; PostgreSQL does not ship with any default implementations. For more information on implementing OAuth validators, see Chapter 50.
+Sets the library/libraries to use for validating OAuth connection tokens. If only one validator library is provided, it will be used by default for any OAuth connections; otherwise, all oauth HBA entries must explicitly set a validator chosen from this list. If set to an empty string (the default), OAuth connections will be refused. This parameter can only be set in the postgresql.conf file. Validator modules must be implemented/obtained separately; PostgreSQL does not ship with any default implementations. For more information on implementing OAuth validators, see Chapter 50.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: integer
+context: sighup
+boot_val: 604800
+unit: s
+enumvals: None
+
+When this parameter is greater than zero, the server will emit a WARNING upon successful password authentication if less than this amount of time remains until the authenticated role's password expires. Note that a role's password only expires if a date was specified in a VALID UNTIL clause for CREATE ROLE or ALTER ROLE. If this value is specified without units, it is taken as seconds. The default is 7 days. This parameter can only be set in the postgresql.conf file or on the server command line.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-Optionally specifies an existing replication slot to be used when connecting to the sending server via streaming replication to control resource removal on the upstream node (see Section 26.2.6). This parameter can only be set in the postgresql.conf file or on the server command line. If this parameter is changed while the WAL receiver process is running, that process is signaled to shut down and expected to restart with the new setting. This setting has no effect if primary_conninfo is not set or the server is not in standby mode.
+Optionally specifies an existing replication slot to be used when connecting to the sending server via streaming replication to control resource removal on the upstream node (see Section 26.2.6). This parameter can only be set in the postgresql.conf file or on the server command line. If this parameter is changed while the WAL receiver process is running, that process is signaled to shut down and expected to restart with the new setting. This setting has no effect if primary_conninfo is not set or the server is not in standby mode. The name cannot be pg_conflict_detection as it is reserved for the conflict detection slot.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-This parameter specifies a shell command that will be executed once only at the end of recovery. This parameter is optional. The purpose of the recovery_end_command is to provide a mechanism for cleanup following replication or recovery. Any %r is replaced by the name of the file containing the last valid restart point, like in archive_cleanup_command. If the command returns a nonzero exit status then a warning log message will be written and the database will proceed to start up anyway. An exception is that if the command was terminated by a signal or an error by the shell (such as command not found), the database will not proceed with startup. This parameter can only be set in the postgresql.conf file or on the server command line.
+This parameter specifies a shell command that will be executed once only at the end of recovery. This parameter is optional. The purpose of the recovery_end_command is to provide a mechanism for cleanup following replication or recovery. Any %r is replaced by the name of the file containing the last valid restartpoint, like in archive_cleanup_command. If the command returns a nonzero exit status then a warning log message will be written and the database will proceed to start up anyway. An exception is that if the command was terminated by a signal or an error by the shell (such as command not found), the database will not proceed with startup. This parameter can only be set in the postgresql.conf file or on the server command line.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: ms
 enumvals: None
 
-By default, a standby server restores WAL records from the sending server as soon as possible. It may be useful to have a time-delayed copy of the data, offering opportunities to correct data loss errors. This parameter allows you to delay recovery by a specified amount of time. For example, if you set this parameter to 5min, the standby will replay each transaction commit only when the system time on the standby is at least five minutes past the commit time reported by the primary. If this value is specified without units, it is taken as milliseconds. The default is zero, adding no delay. It is possible that the replication delay between servers exceeds the value of this parameter, in which case no delay is added. Note that the delay is calculated between the WAL time stamp as written on primary and the current time on the standby. Delays in transfer because of network lag or cascading replication configurations may reduce the actual wait time significantly. If the system clocks on primary and standby are not synchronized, this may lead to recovery applying records earlier than expected; but that is not a major issue because useful settings of this parameter are much larger than typical time deviations between servers. The delay occurs only on WAL records for transaction commits. Other records are replayed as quickly as possible, which is not a problem because MVCC visibility rules ensure their effects are not visible until the corresponding commit record is applied. The delay occurs once the database in recovery has reached a consistent state, until the standby is promoted or triggered. After that the standby will end recovery without further waiting. WAL records must be kept on the standby until they are ready to be applied. Therefore, longer delays will result in a greater accumulation of WAL files, increasing disk space requirements for the standby's pg_wal directory. This parameter is intended for use with streaming replication deployments; however, if the parameter is specified it will be honored in all cases except crash recovery. hot_standby_feedback will be delayed by use of this feature which could lead to bloat on the primary; use both together with care. Warning Synchronous replication is affected by this setting when synchronous_commit is set to remote_apply; every COMMIT will need to wait to be applied. This parameter can only be set in the postgresql.conf file or on the server command line.
+By default, a standby server restores WAL records from the sending server as soon as possible. It may be useful to have a time-delayed copy of the data, offering opportunities to correct data loss errors. This parameter allows you to delay recovery by a specified amount of time. For example, if you set this parameter to 5min, the standby will replay each transaction commit only when the system time on the standby is at least five minutes past the commit time reported by the primary. If this value is specified without units, it is taken as milliseconds. The default is zero, adding no delay. It is possible that the replication delay between servers exceeds the value of this parameter, in which case no delay is added. Note that the delay is calculated between the WAL time stamp as written on primary and the current time on the standby. Delays in transfer because of network lag or cascading replication configurations may reduce the actual wait time significantly. If the system clocks on primary and standby are not synchronized, this may lead to recovery applying records earlier than expected; but that is not a major issue because useful settings of this parameter are much larger than typical time deviations between servers. The delay occurs only on WAL records for transaction commits. Other records are replayed as quickly as possible, which is not a problem because MVCC visibility rules ensure their effects are not visible until the corresponding commit record is applied. The delay occurs once the database in recovery has reached a consistent state, until the standby is promoted or triggered. After that the standby will end recovery without further waiting. WAL records must be kept on the standby until they are ready to be applied. Therefore, longer delays will result in a greater accumulation of WAL files, increasing disk space requirements for the standby's pg_wal directory. This parameter is intended for use with streaming physical replication deployments; however, if the parameter is specified it will be honored in all cases except crash recovery. hot_standby_feedback will be delayed by use of this feature which could lead to bloat on the primary; use both together with care. Warning Synchronous replication is affected by this setting when synchronous_commit is set to remote_apply; every COMMIT will need to wait to be applied. This parameter can only be set in the postgresql.conf file or on the server command line.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: ['pause', 'promote', 'shutdown']
 
-Specifies what action the server should take once the recovery target is reached. The default is pause, which means recovery will be paused. promote means the recovery process will finish and the server will start to accept connections. Finally shutdown will stop the server after reaching the recovery target. The intended use of the pause setting is to allow queries to be executed against the database to check if this recovery target is the most desirable point for recovery. The paused state can be resumed by using pg_wal_replay_resume() (see Table 9.99), which then causes recovery to end. If this recovery target is not the desired stopping point, then shut down the server, change the recovery target settings to a later target and restart to continue recovery. The shutdown setting is useful to have the instance ready at the exact replay point desired. The instance will still be able to replay more WAL records (and in fact will have to replay WAL records since the last checkpoint next time it is started). Note that because recovery.signal will not be removed when recovery_target_action is set to shutdown, any subsequent start will end with immediate shutdown unless the configuration is changed or the recovery.signal file is removed manually. This setting has no effect if no recovery target is set. If hot_standby is not enabled, a setting of pause will act the same as shutdown. If the recovery target is reached while a promotion is ongoing, a setting of pause will act the same as promote. In any case, if a recovery target is configured but the archive recovery ends before the target is reached, the server will shut down with a fatal error.
+Specifies what action the server should take once the recovery target is reached. The default is pause, which means recovery will be paused. promote means the recovery process will finish and the server will start to accept connections. Finally shutdown will stop the server after reaching the recovery target. The intended use of the pause setting is to allow queries to be executed against the database to check if this recovery target is the most desirable point for recovery. The paused state can be resumed by using pg_wal_replay_resume() (see Table 9.101), which then causes recovery to end. If this recovery target is not the desired stopping point, then shut down the server, change the recovery target settings to a later target and restart to continue recovery. The shutdown setting is useful to have the instance ready at the exact replay point desired. The instance will still be able to replay more WAL records (and in fact will have to replay WAL records since the last checkpoint next time it is started). Note that because recovery.signal will not be removed when recovery_target_action is set to shutdown, any subsequent start will end with immediate shutdown unless the configuration is changed or the recovery.signal file is removed manually. This setting has no effect if no recovery target is set. If hot_standby is not enabled, a setting of pause will act the same as shutdown. If the recovery target is reached while a promotion is ongoing, a setting of pause will act the same as promote. In any case, if a recovery target is configured but the archive recovery ends before the target is reached, the server will shut down with a fatal error.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-This parameter specifies the transaction ID up to which recovery will proceed. Keep in mind that while transaction IDs are assigned sequentially at transaction start, transactions can complete in a different numeric order. The transactions that will be recovered are those that committed before (and optionally including) the specified one. The precise stopping point is also influenced by recovery_target_inclusive.
+This parameter specifies the transaction ID up to which recovery will proceed. Keep in mind that while transaction IDs are assigned sequentially at transaction start, transactions can complete in a different numeric order. The transactions that will be recovered are those that committed before (and optionally including) the specified one. The precise stopping point is also influenced by recovery_target_inclusive. The value can be specified as either a 32-bit transaction ID or a 64-bit transaction ID (consisting of an epoch and a 32-bit ID), such as the value returned by pg_current_xact_id(). When a 64-bit transaction ID is provided, only its 32-bit transaction ID portion is used as the recovery target. For example, the values 4294968296 (epoch 1) and 8589935592 (epoch 2) both refer to the same 32-bit transaction ID, 1000. The effective transaction ID (the 32-bit portion) must be greater than or equal to 3.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-The local shell command to execute to retrieve an archived segment of the WAL file series. This parameter is required for archive recovery, but optional for streaming replication. Any %f in the string is replaced by the name of the file to retrieve from the archive, and any %p is replaced by the copy destination path name on the server. (The path name is relative to the current working directory, i.e., the cluster's data directory.) Any %r is replaced by the name of the file containing the last valid restart point. That is the earliest file that must be kept to allow a restore to be restartable, so this information can be used to truncate the archive to just the minimum required to support restarting from the current restore. %r is typically only used by warm-standby configurations (see Section 26.2). Write %% to embed an actual % character. It is important for the command to return a zero exit status only if it succeeds. The command will be asked for file names that are not present in the archive; it must return nonzero when so asked. Examples: restore_command = 'cp /mnt/server/archivedir/%f "%p"' restore_command = 'copy "C:\\server\\archivedir\\%f" "%p"' # Windows An exception is that if the command was terminated by a signal (other than SIGTERM, which is used as part of a database server shutdown) or an error by the shell (such as command not found), then recovery will abort and the server will not start up. This parameter can only be set in the postgresql.conf file or on the server command line.
+The local shell command to execute to retrieve an archived segment of the WAL file series. This parameter is required for archive recovery, but optional for streaming physical replication. Any %f in the string is replaced by the name of the file to retrieve from the archive, and any %p is replaced by the copy destination path name on the server. (The path name is relative to the current working directory, i.e., the cluster's data directory.) Any %r is replaced by the name of the file containing the last valid restartpoint. That is the earliest file that must be kept to allow a restore to be restartable, so this information can be used to truncate the archive to just the minimum required to support restarting from the current restore. %r is typically only used by warm-standby configurations (see Section 26.2). Write %% to embed an actual % character. It is important for the command to return a zero exit status only if it succeeds. The command will be asked for file names that are not present in the archive; it must return nonzero when so asked. Examples: restore_command = 'cp "/mnt/server/archivedir/%f" "%p"' restore_command = 'copy "C:\\server\\archivedir\\%f" "%p"' # Windows An exception is that if the command was terminated by a signal (other than SIGTERM, which is used as part of a database server shutdown) or an error by the shell (such as command not found), then recovery will abort and the server will not start up. This parameter can only be set in the postgresql.conf file or on the server command line.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-This variable specifies the order in which schemas are searched when an object (table, data type, function, etc.) is referenced by a simple name with no schema specified. When there are objects of identical names in different schemas, the one found first in the search path is used. An object that is not in any of the schemas in the search path can only be referenced by specifying its containing schema with a qualified (dotted) name. The value for search_path must be a comma-separated list of schema names. Any name that is not an existing schema, or is a schema for which the user does not have USAGE permission, is silently ignored. If one of the list items is the special name $user, then the schema having the name returned by CURRENT_USER is substituted, if there is such a schema and the user has USAGE permission for it. (If not, $user is ignored.) The system catalog schema, pg_catalog, is always searched, whether it is mentioned in the path or not. If it is mentioned in the path then it will be searched in the specified order. If pg_catalog is not in the path then it will be searched before searching any of the path items. Likewise, the current session's temporary-table schema, pg_temp_nnn, is always searched if it exists. It can be explicitly listed in the path by using the alias pg_temp. If it is not listed in the path then it is searched first (even before pg_catalog). However, the temporary schema is only searched for relation (table, view, sequence, etc.) and data type names. It is never searched for function or operator names. When objects are created without specifying a particular target schema, they will be placed in the first valid schema named in search_path. An error is reported if the search path is empty. The default value for this parameter is "$user", public. This setting supports shared use of a database (where no users have private schemas, and all share use of public), private per-user schemas, and combinations of these. Other effects can be obtained by altering the default search path setting, either globally or per-user. For more information on schema handling, see Section 5.10. In particular, the default configuration is suitable only when the database has a single user or a few mutually-trusting users. The current effective value of the search path can be examined via the SQL function current_schemas (see Section 9.27). This is not quite the same as examining the value of search_path, since current_schemas shows how the items appearing in search_path were resolved.
+This variable specifies the order in which schemas are searched when an object (table, data type, function, etc.) is referenced by a simple name with no schema specified. When there are objects of identical names in different schemas, the one found first in the search path is used. An object that is not in any of the schemas in the search path can only be referenced by specifying its containing schema with a qualified (dotted) name. The value for search_path must be a comma-separated list of schema names. Any name that is not an existing schema, or is a schema for which the user does not have USAGE permission, is silently ignored. If one of the list items is the special name $user, then the schema having the name returned by CURRENT_USER is substituted, if there is such a schema and the user has USAGE permission for it. (If not, $user is ignored.) The system catalog schema, pg_catalog, is always searched, whether it is mentioned in the path or not. If it is mentioned in the path then it will be searched in the specified order. If pg_catalog is not in the path then it will be searched before searching any of the path items. Likewise, the current session's temporary-table schema, pg_temp_nnn, is always searched if it exists. It can be explicitly listed in the path by using the alias pg_temp. If it is not listed in the path then it is searched first (even before pg_catalog). However, the temporary schema is only searched for relation (table, view, sequence, etc.) and data type names. It is never searched for function or operator names. When objects are created without specifying a particular target schema, they will be placed in the first valid schema named in search_path. An error is reported if the search path is empty. The default value for this parameter is "$user", public. This setting supports shared use of a database (where no users have private schemas, and all share use of public), private per-user schemas, and combinations of these. Other effects can be obtained by altering the default search path setting, either globally or per-user. For more information on schema handling, see Section 5.11. In particular, the default configuration is suitable only when the database has a single user or a few mutually-trusting users. The current effective value of the search path can be examined via the SQL function current_schemas (see Section 9.28). This is not quite the same as examining the value of search_path, since current_schemas shows how the items appearing in search_path were resolved.

--- 18
+++ 19 beta 3
@@ -1,6 +1,6 @@
 vartype: string
 context: internal
-boot_val: 18.6 (Debian 18.6-1.pgdg13+2)
+boot_val: 19beta3 (Debian 19~beta3-1.pgdg13+1)
 unit: None
 enumvals: None
 

--- 18
+++ 19 beta 3
@@ -1,6 +1,6 @@
 vartype: integer
 context: internal
-boot_val: 180006
+boot_val: 190000
 unit: None
 enumvals: None
 

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-Specifies the named group to use for TLS key exchange. It needs to be supported by all clients that connect. Multiple groups can be specified by using a colon-separated list. It does not need to match the key type used by the server certificate. This parameter can only be set in the postgresql.conf file or on the server command line. The default is X25519:prime256v1. OpenSSL names for the most common groups are: prime256v1 (NIST P-256), secp384r1 (NIST P-384), secp521r1 (NIST P-521). An incomplete list of available groups can be shown with the command openssl ecparam -list_curves. Not all of them are usable with TLS though, and many supported group names and aliases are omitted. In PostgreSQL versions before 18.0 this setting was named ssl_ecdh_curve and only accepted a single value.
+Specifies the named group to use for TLS key exchange. It needs to be supported by all clients that connect. Multiple groups can be specified by using a colon-separated list. It does not need to match the key type used by the server certificate. This parameter can only be set in the postgresql.conf file or on the server command line. The default is X25519:prime256v1. Note X25519 is not allowed when OpenSSL is configured for FIPS mode and must be removed from the server configuration when FIPS mode is enabled. OpenSSL names for the most common groups are: prime256v1 (NIST P-256), secp384r1 (NIST P-384), secp521r1 (NIST P-521). An incomplete list of available groups can be shown with the command openssl ecparam -list_curves. Not all of them are usable with TLS though, and many supported group names and aliases are omitted. In PostgreSQL versions before 18.0 this setting was named ssl_ecdh_curve and only accepted a single value.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: bool
+context: sighup
+boot_val: off
+unit: None
+enumvals: None
+
+Enables SNI configuration for SSL connections. When set to on host configuration from hosts_file is used, see Section 18.9.6 for more details. This parameter can only be set in the postgresql.conf file or on the server command line. The default is off.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-Specifies a list of cipher suites that are allowed by connections using TLS version 1.3. Multiple cipher suites can be specified by using a colon separated list. If left blank, the default set of cipher suites in OpenSSL will be used. This parameter can only be set in the postgresql.conf file or on the server command line.
+Specifies a list of cipher suites that are allowed by connections using TLS version 1.3. Multiple cipher suites can be specified by using a colon-separated list. If left blank, the default set of cipher suites in OpenSSL will be used. This parameter can only be set in the postgresql.conf file or on the server command line.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: None
 
-This controls whether ordinary string literals ('...') treat backslashes literally, as specified in the SQL standard. Beginning in PostgreSQL 9.1, the default is on (prior releases defaulted to off). Applications can check this parameter to determine how string literals will be processed. The presence of this parameter can also be taken as an indication that the escape string syntax (E'...') is supported. Escape string syntax (Section 4.1.2.2) should be used if an application desires backslashes to be treated as escape characters.
+Beginning in PostgreSQL 19, this parameter is always on. String literals are always parsed as specified in the SQL standard (that is, backslashes are ordinary characters within a string literal). This parameter continues to exist because applications may consult it; but it cannot be set to off. Escape string syntax (Section 4.1.2.2) should be used if an application desires backslashes to be treated as escape characters.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: enum
+context: superuser
+boot_val: auto
+unit: None
+enumvals: ['auto', 'system', 'tsc']
+
+Selects the method for making timing measurements using the OS or specialized CPU instructions. Possible values are: auto (automatically chooses TSC clock source on supported x86-64 CPUs, otherwise uses the OS system clock) system (measures timing using the OS system clock) tsc (measures timing with a CPU instruction, e.g. using RDTSC/RDTSCP on x86-64) The default is auto. Only superusers can change this setting. Changing the setting during query execution is not recommended and may cause interval timings to jump significantly or produce negative values. If enabled, the TSC clock source, named after the Time-Stamp Counter on x86-64, will use specialized CPU instructions when measuring time intervals. This lowers timing overhead compared to reading the OS system clock, and reduces the measurement error on top of the actual runtime, for example with EXPLAIN ANALYZE. On x86-64 CPUs the TSC clock source utilizes the RDTSC instruction for EXPLAIN ANALYZE. For timings that require higher precision the RDTSCP instruction is used, which avoids inaccuracies due to CPU instruction re-ordering. Use of the TSC clock source is not supported on older x86-64 CPUs and other architectures, and is not advised on systems that utilize an emulated TSC, as it is likely slower than the system clock source. To help decide which clock source to use you can run the pg_test_timing utility to check TSC availability, and perform timing measurements.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: ['minimal', 'replica', 'logical']
 
-wal_level determines how much information is written to the WAL. The default value is replica, which writes enough data to support WAL archiving and replication, including running read-only queries on a standby server. minimal removes all logging except the information required to recover from a crash or immediate shutdown. Finally, logical adds information necessary to support logical decoding. Each level includes the information logged at all lower levels. This parameter can only be set at server start. The minimal level generates the least WAL volume. It logs no row information for permanent relations in transactions that create or rewrite them. This can make operations much faster (see Section 14.4.7). Operations that initiate this optimization include: ALTER ... SET TABLESPACE CLUSTER CREATE TABLE REFRESH MATERIALIZED VIEW (without CONCURRENTLY) REINDEX TRUNCATE However, minimal WAL does not contain sufficient information for point-in-time recovery, so replica or higher must be used to enable continuous archiving (archive_mode) and streaming binary replication. In fact, the server will not even start in this mode if max_wal_senders is non-zero. Note that changing wal_level to minimal makes previous base backups unusable for point-in-time recovery and standby servers. In logical level, the same information is logged as with replica, plus information needed to extract logical change sets from the WAL. Using a level of logical will increase the WAL volume, particularly if many tables are configured for REPLICA IDENTITY FULL and many UPDATE and DELETE statements are executed. In releases prior to 9.6, this parameter also allowed the values archive and hot_standby. These are still accepted but mapped to replica.
+wal_level determines how much information is written to the WAL. The default value is replica, which writes enough data to support WAL archiving and replication, including running read-only queries on a standby server. minimal removes all logging except the information required to recover from a crash or immediate shutdown. Finally, logical adds information necessary to support logical decoding. Each level includes the information logged at all lower levels. This parameter can only be set at server start. The minimal level generates the least WAL volume. It logs no row information for permanent relations in transactions that create or rewrite them. This can make operations much faster (see Section 14.4.7). Operations that initiate this optimization include: ALTER ... SET TABLESPACE CLUSTER CREATE TABLE REFRESH MATERIALIZED VIEW (without CONCURRENTLY) REINDEX TRUNCATE However, minimal WAL does not contain sufficient information for point-in-time recovery, so replica or higher must be used to enable continuous archiving (archive_mode) and streaming binary replication. In fact, the server will not even start in this mode if max_wal_senders is non-zero. Note that changing wal_level to minimal makes previous base backups unusable for point-in-time recovery and standby servers. In logical level, the same information is logged as with replica, plus information needed to extract logical change sets from the WAL. Using a level of logical will increase the WAL volume, particularly if many tables are configured for REPLICA IDENTITY FULL and many UPDATE and DELETE statements are executed. It is important to note that when wal_level is set to replica, the effective WAL level can automatically change based on the presence of logical replication slots. The system automatically increases the effective WAL level to logical when creating the first logical replication slot, and decreases it back to replica when dropping or invalidating the last logical replication slot. The current effective WAL level can be monitored through effective_wal_level parameter. In releases prior to 9.6, this parameter also allowed the values archive and hot_standby. These are still accepted but mapped to replica.

--- 18
+++ 19 beta 3
@@ -1,7 +1,7 @@
 vartype: integer
-context: sighup
+context: user
 boot_val: 60000
 unit: ms
 enumvals: None
 
-Terminate replication connections that are inactive for longer than this amount of time. This is useful for the receiving standby server to detect a primary node crash or network outage. If this value is specified without units, it is taken as milliseconds. The default value is 60 seconds. A value of zero disables the timeout mechanism. This parameter can only be set in the postgresql.conf file or on the server command line.
+Terminate replication connections that are inactive for longer than this amount of time. This is useful for the receiving standby server to detect a primary node crash or network outage. If this value is specified without units, it is taken as milliseconds. The default value is 60 seconds. A value of zero disables the timeout mechanism.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: ms
 enumvals: None
 
-Specifies how long the standby server should wait when WAL data is not available from any sources (streaming replication, local pg_wal or WAL archive) before trying again to retrieve WAL data. If this value is specified without units, it is taken as milliseconds. The default value is 5 seconds. This parameter can only be set in the postgresql.conf file or on the server command line. This parameter is useful in configurations where a node in recovery needs to control the amount of time to wait for new WAL data to be available. For example, in archive recovery, it is possible to make the recovery more responsive in the detection of a new WAL file by reducing the value of this parameter. On a system with low WAL activity, increasing it reduces the amount of requests necessary to access WAL archives, something useful for example in cloud environments where the number of times an infrastructure is accessed is taken into account. In logical replication, this parameter also limits how often a failing replication apply worker or table synchronization worker will be respawned.
+Specifies how long the standby server should wait when WAL data is not available from any sources (streaming physical replication, local pg_wal or WAL archive) before trying again to retrieve WAL data. If this value is specified without units, it is taken as milliseconds. The default value is 5 seconds. This parameter can only be set in the postgresql.conf file or on the server command line. This parameter is useful in configurations where a node in recovery needs to control the amount of time to wait for new WAL data to be available. For example, in archive recovery, it is possible to make the recovery more responsive in the detection of a new WAL file by reducing the value of this parameter. On a system with low WAL activity, increasing it reduces the amount of requests necessary to access WAL archives, something useful for example in cloud environments where the number of times an infrastructure is accessed is taken into account. In logical replication, this parameter also limits how often a failing replication apply worker or table/sequence synchronization worker will be respawned.

--- 18
+++ 19 beta 3
@@ -0,0 +1,7 @@
+vartype: integer
+context: user
+boot_val: -1
+unit: ms
+enumvals: None
+
+Specifies the maximum time the server waits during shutdown for all WAL data to be replicated to the receiver. If this value is specified without units, it is taken as milliseconds. A value of -1 (the default) disables the timeout mechanism, allowing the WAL sender to wait as long as necessary for the receiver to catch up. A value of 0 causes the WAL sender to terminate without waiting for the receiver to catch up. When replication is in use, the sending server normally waits until all WAL data has been transferred to the receiver before completing shutdown. This helps keep sender and receiver in sync after shutdown, which is especially important for physical replication switchovers, but it can delay shutdown. If this parameter is set to zero or a positive value, the server stops waiting and completes shutdown when the timeout expires. This can shorten shutdown time, for example, when replication is slow on high-latency networks or when a logical replication apply worker is blocked waiting for locks. However, in this case the sender and receiver may be out of sync after shutdown. Care should be taken to select a value high enough to allow all WAL data to be replicated to the receiver under normal circumstances. This parameter can be set in primary_conninfo and in the CONNECTION clause of CREATE SUBSCRIPTION (for example, include options=-cwal_sender_shutdown_timeout=10s in the connection string), allowing different timeouts per replication connection. For example, when both physical and logical replication are used, it can be disabled for physical replication (e.g., for switchovers) while enabled for logical replication to limit shutdown time.

--- 18
+++ 19 beta 3
@@ -4,4 +4,4 @@
 unit: None
 enumvals: ['base64', 'hex']
 
-Sets how binary values are to be encoded in XML. This applies for example when bytea values are converted to XML by the functions xmlelement or xmlforest. Possible values are base64 and hex, which are both defined in the XML Schema standard. The default is base64. For further information about XML-related functions, see Section 9.15. The actual choice here is mostly a matter of taste, constrained only by possible restrictions in client applications. Both methods support all possible values, although the hex encoding will be somewhat larger than the base64 encoding.
+Sets how binary values are to be encoded in XML. This applies for example when bytea values are converted to XML by the functions xmlelement or xmlforest. Possible values are base64 and hex, which are both defined in the XML Schema standard. The default is base64. For further information about XML-related functions, see Section 9.16. The actual choice here is mostly a matter of taste, constrained only by possible restrictions in client applications. Both methods support all possible values, although the hex encoding will be somewhat larger than the base64 encoding.