Remove the special behavior of oid columns (Andres Freund, John Naylor) \u00a7
\nPreviously, a normally-invisible oid column could be specified during table creation using WITH OIDS; that ability has been removed. Columns can still be explicitly declared as type oid. Operations on tables that have columns created using WITH OIDS will need adjustment.
The system catalogs that previously had hidden oid columns now have ordinary oid columns. Hence, SELECT * will now output those columns, whereas previously they would be displayed only if selected explicitly.
Remove data types abstime, reltime, and tinterval (Andres Freund) \u00a7
These are obsoleted by SQL-standard types such as timestamp.
Remove the timetravel extension (Andres Freund) \u00a7
Move recovery.conf settings into postgresql.conf (Masao Fujii, Simon Riggs, Abhijit Menon-Sen, Sergei Kornilov) \u00a7
recovery.conf is no longer used, and the server will not start if that file exists. recovery.signal and standby.signal files are now used to switch into non-primary mode. The trigger_file setting has been renamed to promote_trigger_file. The standby_mode setting has been removed.
Do not allow multiple conflicting recovery_target* specifications (Peter Eisentraut) \u00a7
Specifically, only allow one of recovery_target, recovery_target_lsn, recovery_target_name, recovery_target_time, and recovery_target_xid. Previously, multiple different instances of these parameters could be specified, and the last one was honored. Now, only one can be specified, though the same one can be specified multiple times and the last specification is honored.
", "text": "Do not allow multiple conflicting recovery_target* specifications (Peter Eisentraut) \u00a7 Specifically, only allow one of recovery_target, recovery_target_lsn, recovery_target_name, recovery_target_time, and recovery_target_xid. Previously, multiple different instances of these parameters could be specified, and the last one was honored. Now, only one can be specified, though the same one can be specified multiple times and the last specification is honored.", "title": "Do not allow multiple conflicting recovery_target* specifications", "commits": ["f2cbffc7a"], "section": "Compatibility", "category": "compatibility", "source_url": "/docs/release/12.0/#id-1.11.6.28.4", "source_hash": "fad2d6a2ad9f324e20ef3ac8d91c870684fee613526ec2ced1a845c19a3db4e5", "section_path": ["Compatibility"], "commit_groups": [["f2cbffc7a"]], "identity_text": "Do not allow multiple conflicting recovery_target* specifications (Peter Eisentraut) Specifically, only allow one of guc-recovery-target , guc-recovery-target-lsn , guc-recovery-target-name , guc-recovery-target-time , and guc-recovery-target-xid . Previously, multiple different instances of these parameters could be specified, and the last one was honored. Now, only one can be specified, though the same one can be specified multiple times and the last specification is honored.", "commit_aliases": ["f2cbffc7a"], "source_commits": ["f2cbffc7a"], "source_entry_id": "12.0/migration/005", "db_id": "86c144405f8c41cd8b0a9caca14a0400", "patch_ids": ["9b1295b2da67a371becbd16e0536209e"], "statement_hash": "44d748fa1ce3e82a41012868460e0f33f0e495a9a6ba707671a4969841b3f51f", "relations": [], "category_label": "Compatibility", "url": "/docs/compare/?release=12.0#12.0-0d313d7d81a8ac70", "migration": true}, {"id": "12.0-7958e5d19551bf1a", "cves": [], "html": "Cause recovery to advance to the latest timeline by default (Peter Eisentraut) \u00a7
\nSpecifically, recovery_target_timeline now defaults to latest. Previously, it defaulted to current.
Refactor code for geometric functions and operators (Emre Hasegeli) \u00a7 \u00a7 \u00a7
\nThis could lead to more accurate, but slightly different, results compared to previous releases. Notably, cases involving NaN, underflow, overflow, and division by zero are handled more consistently than before.
", "text": "Refactor code for geometric functions and operators (Emre Hasegeli) \u00a7 \u00a7 \u00a7 This could lead to more accurate, but slightly different, results compared to previous releases. Notably, cases involving NaN, underflow, overflow, and division by zero are handled more consistently than before.", "title": "Refactor code for geometric functions and operators", "commits": ["2e2a392de", "a7dc63d90", "c4c340088"], "section": "Compatibility", "category": "compatibility", "source_url": "/docs/release/12.0/#id-1.11.6.28.4", "source_hash": "b1ca0eae846b8380319be35e6655c93e12bf0475cf7c27685404868c7b23d78a", "section_path": ["Compatibility"], "commit_groups": [["2e2a392de"], ["a7dc63d90"], ["c4c340088"]], "identity_text": "Refactor code for geometric functions and operators (Emre Hasegeli) This could lead to more accurate, but slightly different, results compared to previous releases. Notably, cases involving NaN, underflow, overflow, and division by zero are handled more consistently than before.", "commit_aliases": ["2e2a392de", "a7dc63d90", "c4c340088"], "source_commits": ["2e2a392de", "a7dc63d90", "c4c340088"], "source_entry_id": "12.0/migration/007", "db_id": "01d2a7a76e1c8c7e81512a30209a2adc", "patch_ids": ["4b08607cab81347ded8c176477ecd212", "7e4cc49893c3728a5da3858fa7cbe3a0", "f9735f476c008bf5007f44787426e3c8"], "statement_hash": "620f296b2f6a12b9a7fc195445bc003cb0098deefbafe17084a073eb9f58f0b6", "relations": [], "category_label": "Compatibility", "url": "/docs/compare/?release=12.0#12.0-fafce29314664030", "migration": true}, {"id": "12.0-52ca837d7c13aad9", "cves": [], "html": "Improve performance by using a new algorithm for output of real and double precision values (Andrew Gierth) \u00a7 \u00a7
Previously, displayed floating-point values were rounded to 6 (for real) or 15 (for double precision) digits by default, adjusted by the value of extra_float_digits. Now, whenever extra_float_digits is more than zero (as it now is by default), only the minimum number of digits required to preserve the exact binary value are output. The behavior is the same as before when extra_float_digits is set to zero or less.
Also, formatting of floating-point exponents is now uniform across platforms: two digits are used unless three are necessary. In previous releases, Windows builds always printed three digits.
", "text": "Improve performance by using a new algorithm for output of real and double precision values (Andrew Gierth) \u00a7 \u00a7 Previously, displayed floating-point values were rounded to 6 (for real) or 15 (for double precision) digits by default, adjusted by the value of extra_float_digits. Now, whenever extra_float_digits is more than zero (as it now is by default), only the minimum number of digits required to preserve the exact binary value are output. The behavior is the same as before when extra_float_digits is set to zero or less. Also, formatting of floating-point exponents is now uniform across platforms: two digits are used unless three are necessary. In previous releases, Windows builds always printed three digits.", "title": "Improve performance by using a new algorithm for output of real and double precision values", "commits": ["02ddd4993", "f1885386f"], "section": "Compatibility", "category": "compatibility", "source_url": "/docs/release/12.0/#id-1.11.6.28.4", "source_hash": "dab0a1b0cc48b9a5bf410d249a5497f93e9bef45faacf7f49e44fd9b222ab196", "section_path": ["Compatibility"], "commit_groups": [["02ddd4993"], ["f1885386f"]], "identity_text": "Improve performance by using a new algorithm for output of real and double precision values (Andrew Gierth) Previously, displayed floating-point values were rounded to 6 (for real) or 15 (for double precision) digits by default, adjusted by the value of guc-extra-float-digits . Now, whenever extra_float_digits is more than zero (as it now is by default), only the minimum number of digits required to preserve the exact binary value are output. The behavior is the same as before when extra_float_digits is set to zero or less. Also, formatting of floating-point exponents is now uniform across platforms: two digits are used unless three are necessary. In previous releases, Windows builds always printed three digits.", "commit_aliases": ["02ddd4993", "f1885386f"], "source_commits": ["02ddd4993", "f1885386f"], "source_entry_id": "12.0/migration/008", "db_id": "bfbe67b81c03b40560f30245ff680049", "patch_ids": ["4c6aa50270eed3114a78085b39bc9f31", "7e14126e5c64583e0fabbeac1ac3d4f5"], "statement_hash": "e78a41ca94a6779e9557c0c1add6dffda635aad95aac66bb84ba32c46664500c", "relations": [], "category_label": "Compatibility", "url": "/docs/compare/?release=12.0#12.0-52ca837d7c13aad9", "migration": true}, {"id": "12.0-eacf18ab586153a7", "cves": [], "html": "random() and setseed() now behave uniformly across platforms (Tom Lane) \u00a7 \u00a7
The sequence of random() values generated following a setseed() call with a particular seed value is likely to be different now than before. However, it will also be repeatable, which was not previously guaranteed because of interference from other uses of random numbers inside the server. The SQL random() function now has its own private per-session state to forestall that.
Change SQL-style substring() to have standard-compliant greediness behavior (Tom Lane) \u00a7
In cases where the pattern can be matched in more than one way, the initial sub-pattern is now treated as matching the least possible amount of text rather than the greatest; for example, a pattern such as %#\"aa*#\"% now selects the first group of a's from the input, not the last group.
Do not pretty-print the result of xpath() or the XMLTABLE construct (Tom Lane) \u00a7
In some cases, these functions would insert extra whitespace (newlines and/or spaces) in nodeset values. This is undesirable since depending on usage, the whitespace might be considered semantically significant.
", "text": "Do not pretty-print the result of xpath() or the XMLTABLE construct (Tom Lane) \u00a7 In some cases, these functions would insert extra whitespace (newlines and/or spaces) in nodeset values. This is undesirable since depending on usage, the whitespace might be considered semantically significant.", "title": "Do not pretty-print the result of xpath() or the XMLTABLE construct", "commits": ["c06e3550d"], "section": "Compatibility", "category": "compatibility", "source_url": "/docs/release/12.0/#id-1.11.6.28.4", "source_hash": "f85a1ea6bc54cf5412cc6e62a23ccd9db784544dc53576ba91420aa04bdbb45d", "section_path": ["Compatibility"], "commit_groups": [["c06e3550d"]], "identity_text": "Do not pretty-print the result of xpath() or the XMLTABLE construct (Tom Lane) In some cases, these functions would insert extra whitespace (newlines and/or spaces) in nodeset values. This is undesirable since depending on usage, the whitespace might be considered semantically significant.", "commit_aliases": ["c06e3550d"], "source_commits": ["c06e3550d"], "source_entry_id": "12.0/migration/011", "db_id": "8716d023f130c790c8eb92d3ac539ea2", "patch_ids": ["86841fc8e89d64fa796ca0a2224a90fc"], "statement_hash": "ba87e28346ceb127f86f2a36668ff4dfe4567bf84d196ed06a16fc2e85ea9e89", "relations": [], "category_label": "Compatibility", "url": "/docs/compare/?release=12.0#12.0-39f003b755289ae3", "migration": true}, {"id": "12.0-f0852cf31947cb08", "cves": [], "html": "Rename command-line tool pg_verify_checksums to pg_checksums (Micha\u00ebl Paquier) \u00a7
", "text": "Rename command-line tool pg_verify_checksums to pg_checksums (Micha\u00ebl Paquier) \u00a7", "title": "Rename command-line tool pg_verify_checksums to pg_checksums", "commits": ["6dd263cfa"], "section": "Compatibility", "category": "compatibility", "source_url": "/docs/release/12.0/#id-1.11.6.28.4", "source_hash": "a2f33e3193d08a422f462163c6c3a5c6fa9c0a7e3a1cd6df65e7f70d86771bb9", "section_path": ["Compatibility"], "commit_groups": [["6dd263cfa"]], "identity_text": "Rename command-line tool pg_verify_checksums to app-pgchecksums (Micha\u00ebl Paquier)", "commit_aliases": ["6dd263cfa"], "source_commits": ["6dd263cfa"], "source_entry_id": "12.0/migration/012", "db_id": "15b78f9b2e86ec480cb59f59cdb2884c", "patch_ids": ["3d81f3bdd33615533411e7a33aec69ff"], "statement_hash": "6f52efc19efbc75d23ffa67a5f64724f2c1f9c9ef7ff08716f1c3be7bb28605b", "relations": [], "category_label": "Compatibility", "url": "/docs/compare/?release=12.0#12.0-f0852cf31947cb08", "migration": true}, {"id": "12.0-fee9dbd95d921244", "cves": [], "html": "In pg_restore, require specification of -f - to send the dump contents to standard output (Euler Taveira) \u00a7
Previously, this happened by default if no destination was specified, but that was deemed to be unfriendly.
", "text": "In pg_restore, require specification of -f - to send the dump contents to standard output (Euler Taveira) \u00a7 Previously, this happened by default if no destination was specified, but that was deemed to be unfriendly.", "title": "In pg_restore, require specification of -f - to send the dump contents to standard output", "commits": ["413ccaa74"], "section": "Compatibility", "category": "compatibility", "source_url": "/docs/release/12.0/#id-1.11.6.28.4", "source_hash": "588bd80793977eca8da5f1b7c2b62f4d763b95055428bbc0b1d41e3832b33677", "section_path": ["Compatibility"], "commit_groups": [["413ccaa74"]], "identity_text": "In app-pgrestore , require specification of -f - to send the dump contents to standard output (Euler Taveira) Previously, this happened by default if no destination was specified, but that was deemed to be unfriendly.", "commit_aliases": ["413ccaa74"], "source_commits": ["413ccaa74"], "source_entry_id": "12.0/migration/013", "db_id": "76ec4d4b6d7ddc35f24914ca4317c35e", "patch_ids": ["a3b8c238e373d06d74534a0a9bcfb350"], "statement_hash": "db990fbc25e557db13bf91492fc43ba521a7dd3ddb098cbd75ba716ca953d04a", "relations": [], "category_label": "Compatibility", "url": "/docs/compare/?release=12.0#12.0-fee9dbd95d921244", "migration": true}, {"id": "12.0-bf14302696d38d09", "cves": [], "html": "Disallow non-unique abbreviations in psql's \\pset format command (Daniel V\u00e9rit\u00e9) \u00a7 \u00a7
Previously, for example, \\pset format a chose aligned; it will now fail since that could equally well mean asciidoc.
In new btree indexes, the maximum index entry length is reduced by eight bytes, to improve handling of duplicate entries (Peter Geoghegan) \u00a7
\nThis means that a REINDEX operation on an index pg_upgrade'd from a previous release could potentially fail.
", "text": "In new btree indexes, the maximum index entry length is reduced by eight bytes, to improve handling of duplicate entries (Peter Geoghegan) \u00a7 This means that a REINDEX operation on an index pg_upgrade'd from a previous release could potentially fail.", "title": "In new btree indexes, the maximum index entry length is reduced by eight bytes, to improve handling of duplicate entries", "commits": ["dd299df81"], "section": "Compatibility", "category": "compatibility", "source_url": "/docs/release/12.0/#id-1.11.6.28.4", "source_hash": "56b3b4590cec7cbffd38c20164be5705411ce92bdb773b31eabcb4e9c5abd016", "section_path": ["Compatibility"], "commit_groups": [["dd299df81"]], "identity_text": "In new btree indexes, the maximum index entry length is reduced by eight bytes, to improve handling of duplicate entries (Peter Geoghegan) This means that a sql-reindex operation on an index pg_upgrade'd from a previous release could potentially fail.", "commit_aliases": ["dd299df81"], "source_commits": ["dd299df81"], "source_entry_id": "12.0/migration/015", "db_id": "77c2078559927cb4722625ff14b67cfd", "patch_ids": ["a43ca6400105f4870998ecb53a5cd53b"], "statement_hash": "b4c594071658d7c9fac0f2e3a788138a8a2256d3f93632c720090c586d203c8d", "relations": [{"rule": 2, "type": "related", "target": "aad8107f07f86f1bde08c4fc057e36e3", "evidence": {"same_day": true, "patch_ids": ["a43ca6400105f4870998ecb53a5cd53b"]}}], "category_label": "Compatibility", "url": "/docs/compare/?release=12.0#12.0-a316fc9b14a3be83", "migration": true}, {"id": "12.0-fdf6fa70e9bf908d", "cves": [], "html": "Cause DROP IF EXISTS FUNCTION/PROCEDURE/AGGREGATE/ROUTINE to generate an error if no argument list is supplied and there are multiple matching objects (David Rowley) \u00a7
Also improve the error message in such cases.
", "text": "Cause DROP IF EXISTS FUNCTION/PROCEDURE/AGGREGATE/ROUTINE to generate an error if no argument list is supplied and there are multiple matching objects (David Rowley) \u00a7 Also improve the error message in such cases.", "title": "Cause DROP IF EXISTS FUNCTION/PROCEDURE/AGGREGATE/ROUTINE to generate an error if no argument list is supplied and there are multiple matching objects", "commits": ["bfb456c1b"], "section": "Compatibility", "category": "compatibility", "source_url": "/docs/release/12.0/#id-1.11.6.28.4", "source_hash": "ab9230b5836eaad5e3ee9ede05ef657febe94de0965eb4c94bff5ee9a9a7eab3", "section_path": ["Compatibility"], "commit_groups": [["bfb456c1b"]], "identity_text": "Cause DROP IF EXISTS FUNCTION/PROCEDURE/AGGREGATE/ROUTINE to generate an error if no argument list is supplied and there are multiple matching objects (David Rowley) Also improve the error message in such cases.", "commit_aliases": ["bfb456c1b"], "source_commits": ["bfb456c1b"], "source_entry_id": "12.0/migration/016", "db_id": "0235c27f5f6234d0ddc2f3943fe28903", "patch_ids": ["3ab14ad146dfca49718dd441c433ca90"], "statement_hash": "d9a13f536419bce12dcebcec26bdb174dd54ac99e8a88ea08c2e706fa9636b9f", "relations": [], "category_label": "Compatibility", "url": "/docs/compare/?release=12.0#12.0-fdf6fa70e9bf908d", "migration": true}, {"id": "12.0-5eda978cc5761799", "cves": [], "html": "Split the pg_statistic_ext catalog into two catalogs, and add the pg_stats_ext view of it (Dean Rasheed, Tomas Vondra) \u00a7 \u00a7
This change supports hiding potentially-sensitive statistics data from unprivileged users.
", "text": "Split the pg_statistic_ext catalog into two catalogs, and add the pg_stats_ext view of it (Dean Rasheed, Tomas Vondra) \u00a7 \u00a7 This change supports hiding potentially-sensitive statistics data from unprivileged users.", "title": "Split the pg_statistic_ext catalog into two catalogs, and add the pg_stats_ext view of it", "commits": ["6cbfb784c", "aa087ec64"], "section": "Compatibility", "category": "compatibility", "source_url": "/docs/release/12.0/#id-1.11.6.28.4", "source_hash": "24953cdc97926cab02809e0d9cbccbc620a01980ad29e92b026aaf2fb32c1a79", "section_path": ["Compatibility"], "commit_groups": [["6cbfb784c"], ["aa087ec64"]], "identity_text": "Split the pg_statistic_ext catalog into two catalogs, and add the pg_stats_ext view of it (Dean Rasheed, Tomas Vondra) This change supports hiding potentially-sensitive statistics data from unprivileged users.", "commit_aliases": ["6cbfb784c", "aa087ec64"], "source_commits": ["6cbfb784c", "aa087ec64"], "source_entry_id": "12.0/migration/017", "db_id": "2c459fa6fb9d0b0257d58e699a5cb1d8", "patch_ids": ["3d504a760f99aa341951c42126673643", "4b39c020512cd33481dd3ddc8ee9ebc9"], "statement_hash": "010ea0b44f70c3142a933ff4c0414153b2bfee01435909ec5a1105fc274c2e18", "relations": [], "category_label": "Compatibility", "url": "/docs/compare/?release=12.0#12.0-5eda978cc5761799", "migration": true}, {"id": "12.0-d00c4bd3641fd1a2", "cves": [], "html": "Remove obsolete pg_constraint.consrc column (Peter Eisentraut) \u00a7
This column has been deprecated for a long time, because it did not update in response to other catalog changes (such as column renamings). The recommended way to get a text version of a check constraint's expression from pg_constraint is pg_get_expr(conbin, conrelid). pg_get_constraintdef() is also a useful alternative.
Remove obsolete pg_attrdef.adsrc column (Peter Eisentraut) \u00a7
This column has been deprecated for a long time, because it did not update in response to other catalog changes (such as column renamings). The recommended way to get a text version of a default-value expression from pg_attrdef is pg_get_expr(adbin, adrelid).
Mark table columns of type name as having \u201cC\u201d collation by default (Tom Lane, Daniel V\u00e9rit\u00e9) \u00a7 \u00a7
\nThe comparison operators for data type name can now use any collation, rather than always using \u201cC\u201d collation. To preserve the previous semantics of queries, columns of type name are now explicitly marked as having \u201cC\u201d collation. A side effect of this is that regular-expression operators on name columns will now use the \u201cC\u201d collation by default, not the database collation, to determine the behavior of locale-dependent regular expression patterns (such as \\w). If you want non-C behavior for a regular expression on a name column, attach an explicit COLLATE clause. (For user-defined name columns, another possibility is to specify a different collation at table creation time; but that just moves the non-backwards-compatibility to the comparison operators.)
Treat object-name columns in the information_schema views as being of type name, not varchar (Tom Lane) \u00a7 \u00a7 \u00a7
Per the SQL standard, object-name columns in the information_schema views are declared as being of domain type sql_identifier. In PostgreSQL, the underlying catalog columns are really of type name. This change makes sql_identifier be a domain over name, rather than varchar as before. This eliminates a semantic mismatch in comparison and sorting behavior, which can greatly improve the performance of queries on information_schema views that restrict an object-name column. Note however that inequality restrictions, for example
SELECT ... FROM information_schema.tables WHERE table_name < 'foo';\n\n
will now use \u201cC\u201d-locale comparison semantics by default, rather than the database's default collation as before. Sorting on these columns will also follow \u201cC\u201d ordering rules. The previous behavior (and inefficiency) can be enforced by adding a COLLATE \"default\" clause.
Remove the ability to disable dynamic shared memory (Kyotaro Horiguchi) \u00a7
\nSpecifically, dynamic_shared_memory_type can no longer be set to none.
Parse libpq integer connection parameters more strictly (Fabien Coelho) \u00a7
\nIn previous releases, using an incorrect integer value for connection parameters connect_timeout, keepalives, keepalives_count, keepalives_idle, keepalives_interval and port resulted in libpq either ignoring those values or failing with incorrect error messages.
Improve performance of many operations on partitioned tables (Amit Langote, David Rowley, Tom Lane, \u00c1lvaro Herrera) \u00a7 \u00a7 \u00a7 \u00a7 \u00a7
\nAllow tables with thousands of child partitions to be processed efficiently by operations that only affect a small number of partitions.
", "text": "Improve performance of many operations on partitioned tables (Amit Langote, David Rowley, Tom Lane, \u00c1lvaro Herrera) \u00a7 \u00a7 \u00a7 \u00a7 \u00a7 Allow tables with thousands of child partitions to be processed efficiently by operations that only affect a small number of partitions.", "title": "Improve performance of many operations on partitioned tables", "commits": ["34c9e455d", "3f2393ede", "428b260f8", "9eefba181", "c6e4133fa"], "section": "Server / Partitioning", "category": "performance", "source_url": "/docs/release/12.0/#id-1.11.6.28.5.3.2", "source_hash": "a030c44a6bda49aa7c10130b1ea630d92d4ccb1693797a3fa5d67c26e30977b2", "section_path": ["Server", "Partitioning"], "commit_groups": [["34c9e455d"], ["3f2393ede"], ["428b260f8"], ["9eefba181"], ["c6e4133fa"]], "identity_text": "Improve performance of many operations on partitioned tables (Amit Langote, David Rowley, Tom Lane, \u00c1lvaro Herrera) Allow tables with thousands of child partitions to be processed efficiently by operations that only affect a small number of partitions.", "commit_aliases": ["34c9e455d", "3f2393ede", "428b260f8", "9eefba181", "c6e4133fa"], "source_commits": ["34c9e455d", "3f2393ede", "428b260f8", "9eefba181", "c6e4133fa"], "source_entry_id": "12.0/changes/001", "db_id": "6581fcf4cf7e96cc3cf66a5c2b61f96b", "patch_ids": ["2152487ea6caf346741426532b6bc621", "30c3100ae10f72b727560637b07a7130", "968dede4cc487f6435cd952fdc9d4c7f", "d7af3ea5e86b657289ed413905a3fafc", "f8f7d9451de18f0b7f511197046cc3d4"], "statement_hash": "301dd5333d6443589c319946860fa172fc1cf6cbe0e0fee545d436039230cbd5", "relations": [], "category_label": "Performance", "url": "/docs/compare/?release=12.0#12.0-600449968eb181e8", "migration": false}, {"id": "12.0-954c401b872686d9", "cves": [], "html": "Allow foreign keys to reference partitioned tables (\u00c1lvaro Herrera) \u00a7
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Allow partition bounds to be any expression (Kyotaro Horiguchi, Tom Lane, Amit Langote) \u00a7
\nSuch expressions are evaluated at partitioned-table creation time. Previously, only simple constants were allowed as partition bounds.
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Avoid sorting when partitions are already being scanned in the necessary order (David Rowley) \u00a7
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\nThe new function pg_partition_root() returns the top-most parent of a partition tree, pg_partition_ancestors() reports all ancestors of a partition, and pg_partition_tree() displays information about partitions.
Include partitioned indexes in the system view pg_indexes (Suraj Kharage) \u00a7
Add psql command \\dP to list partitioned tables and indexes (Pavel Stehule) \u00a7
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Fix bugs that could cause ALTER TABLE DETACH PARTITION to leave behind incorrect dependency state, allowing subsequent operations to misbehave, for example by not dropping a former partition child index when its table is dropped (Tom Lane) \u00a7
Improve performance and space utilization of btree indexes with many duplicates (Peter Geoghegan, Heikki Linnakangas) \u00a7 \u00a7 \u00a7
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Indexes pg_upgrade'd from previous releases will not have these benefits.
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\nIndexes pg_upgrade'd from previous releases will not have these benefits.
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Add support for nearest-neighbor (KNN) searches of SP-GiST indexes (Nikita Glukhov, Alexander Korotkov, Vlad Sterzhanov) \u00a7
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Reduce locking requirements for index renaming (Peter Eisentraut) \u00a7
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Allow common table expressions (CTEs) to be inlined into the outer query (Andreas Karlsson, Andrew Gierth, David Fetter, Tom Lane) \u00a7 \u00a7
\nSpecifically, CTEs are automatically inlined if they have no side-effects, are not recursive, and are referenced only once in the query. Inlining can be prevented by specifying MATERIALIZED, or forced for multiply-referenced CTEs by specifying NOT MATERIALIZED. Previously, CTEs were never inlined and were always evaluated before the rest of the query.
Allow control over when generic plans are used for prepared statements (Pavel Stehule) \u00a7
\nThis is controlled by the plan_cache_mode server parameter.
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Improve processing of domains that have no check constraints (Tom Lane) \u00a7
\nDomains that are being used purely as type aliases no longer cause optimization difficulties.
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Improve optimizer's ability to verify that partial indexes with IS NOT NULL conditions are usable in queries (Tom Lane, James Coleman) \u00a7 \u00a7
Usability can now be recognized in more cases where the calling query involves casts or large x IN (array)
Compute ANALYZE statistics using the collation defined for each column (Tom Lane) \u00a7
Previously, the database's default collation was used for all statistics. This potentially gives better optimizer behavior for columns with non-default collations.
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These changes primarily improve the efficiency of self-joins on ctid columns.
Fix the leakproofness designations of some btree comparison operators and support functions (Tom Lane) \u00a7 \u00a7
\nThis allows some optimizations that previously would not have been applied in the presence of security barrier views or row-level security.
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\nNote that this support is not built by default, but has to be selected explicitly while configuring the build.
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", "text": "Speed up keyword lookup (John Naylor, Joerg Sonnenberger, Tom Lane) \u00a7 \u00a7", "title": "Speed up keyword lookup", "commits": ["afb0d0712", "c64d0cd5c"], "section": "Server / General Performance", "category": "performance", "source_url": "/docs/release/12.0/#id-1.11.6.28.5.3.5", "source_hash": "2bd45e72812f16605270930458a4b481160c52036c2a3b38e4e104ef2d9452e8", "section_path": ["Server", "General Performance"], "commit_groups": [["afb0d0712"], ["c64d0cd5c"]], "identity_text": "Speed up keyword lookup (John Naylor, Joerg Sonnenberger, Tom Lane)", "commit_aliases": ["afb0d0712", "c64d0cd5c"], "source_commits": ["afb0d0712", "c64d0cd5c"], "source_entry_id": "12.0/changes/035", "db_id": "448151831a0ba46fd1ed924df359038f", "patch_ids": ["4b03e6a5b223c217cc49d22f94ce596a", "8160758b3010e76b4610c28aa1e93227"], "statement_hash": "a5dd222691bf226cdaf2164f766805d93c7e30b8dfade4215c55173491894a97", "relations": [], "category_label": "Performance", "url": "/docs/compare/?release=12.0#12.0-73db492cee076bc3", "migration": false}, {"id": "12.0-fa202b552fd2017b", "cves": [], "html": "Improve search performance for multi-byte characters in position() and related functions (Heikki Linnakangas) \u00a7
Allow toasted values to be minimally decompressed (Paul Ramsey) \u00a7
\nThis is useful for routines that only need to examine the initial portion of a toasted field.
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This can be optimized when the table's column constraints can be recognized as disallowing nulls.
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Previously, parallelism was disabled when in this mode.
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This reduces the number of system calls required for I/O.
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\nThe parameter log_transaction_sample_rate controls this.
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Add progress reporting to CLUSTER and VACUUM FULL (Tatsuro Yamada) \u00a7
Progress is reported in the pg_stat_progress_cluster system view.
Add progress reporting to pg_checksums (Michael Banck, Bernd Helmle) \u00a7
\nThis is enabled with the option --progress.
Add counter of checksum failures to pg_stat_database (Magnus Hagander) \u00a7
Add tracking of global objects in system view pg_stat_database (Julien Rouhaud) \u00a7
Global objects are shown with a pg_stat_database.datid value of zero.
Add the ability to list the contents of the archive directory (Christoph Moench-Tegeder) \u00a7
\nThe function is pg_ls_archive_statusdir().
Add the ability to list the contents of temporary directories (Nathan Bossart) \u00a7
\nThe function, pg_ls_tmpdir(), optionally allows specification of a tablespace.
Add information about the client certificate to the system view pg_stat_ssl (Peter Eisentraut) \u00a7
The new columns are client_serial and issuer_dn. Column clientdn has been renamed to client_dn for clarity.
Restrict visibility of rows in pg_stat_ssl for unprivileged users (Peter Eisentraut) \u00a7
At server start, emit a log message including the server version number (Christoph Berg) \u00a7
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\nThis avoids log spam from certain forms of monitoring.
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Add a wait event for fsync of WAL segments (Konstantin Knizhnik) \u00a7
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Allow the clientcert pg_hba.conf option to check that the database user name matches the client certificate's common name (Julian Markwort, Marius Timmer) \u00a7
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Allow discovery of an LDAP server using DNS SRV records (Thomas Munro) \u00a7
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Add ability to enable/disable cluster checksums using pg_checksums (Michael Banck, Micha\u00ebl Paquier) \u00a7
\nThe cluster must be shut down for these operations.
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Allow fractional input for integer server parameters (Tom Lane) \u00a7
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Allow units to be defined for floating-point server parameters (Tom Lane) \u00a7
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\nAvoiding file recycling can be beneficial on copy-on-write file systems like ZFS.
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\nThe server parameters are ssl_min_protocol_version and ssl_max_protocol_version.
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\nThis allows selection of System V shared memory, if desired.
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\nThe functions for this are pg_copy_physical_replication_slot() and pg_copy_logical_replication_slot().
Make max_wal_senders not count as part of max_connections (Alexander Kukushkin) \u00a7
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Make recovery fail if a two-phase transaction status file is corrupt (Micha\u00ebl Paquier) \u00a7
\nPreviously, a warning was logged and recovery continued, allowing the transaction to be lost.
", "text": "Make recovery fail if a two-phase transaction status file is corrupt (Micha\u00ebl Paquier) \u00a7 Previously, a warning was logged and recovery continued, allowing the transaction to be lost.", "title": "Make recovery fail if a two-phase transaction status file is corrupt", "commits": ["8582b4d04"], "section": "Streaming Replication and Recovery", "category": "feature", "source_url": "/docs/release/12.0/#id-1.11.6.28.5.4", "source_hash": "a48c96e23009aacaa4968eae7a3c995d5ce138caa21d7c90b291fc8a197f8be1", "section_path": ["Streaming Replication and Recovery"], "commit_groups": [["8582b4d04"]], "identity_text": "Make recovery fail if a two-phase transaction status file is corrupt (Micha\u00ebl Paquier) Previously, a warning was logged and recovery continued, allowing the transaction to be lost.", "commit_aliases": ["8582b4d04"], "source_commits": ["8582b4d04"], "source_entry_id": "12.0/changes/080", "db_id": "93c983372e45e7180e8bfbe83ed56ae0", "patch_ids": ["c9289fef90f130eda88fdbe1be027b16"], "statement_hash": "c2352ea8afe9fd0dab4c9353c201f4a81f3cfbc74e4fd3c56338125c52312206", "relations": [], "category_label": "Features", "url": "/docs/compare/?release=12.0#12.0-f5669c9f77ba59db", "migration": false}, {"id": "12.0-78d26fcc74e98aec", "cves": [], "html": "Add REINDEX CONCURRENTLY option to allow reindexing without locking out writes (Micha\u00ebl Paquier, Andreas Karlsson, Peter Eisentraut) \u00a7
This is also controlled by the reindexdb application's --concurrently option.
Add support for generated columns (Peter Eisentraut) \u00a7
\nThe content of generated columns are computed from expressions (including references to other columns in the same table) rather than being specified by INSERT or UPDATE commands.
Add a WHERE clause to COPY FROM to control which rows are accepted (Surafel Temesgen) \u00a7
This provides a simple way to filter incoming data.
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\nPreviously, ALTER TYPE ... ADD VALUE could not be called in a transaction block, unless it was part of the same transaction that created the enumerated type. Now it can be called in a later transaction, so long as the new enumerated value is not referenced until after it is committed.
Add commands to end a transaction and start a new one (Peter Eisentraut) \u00a7
\nThe commands are COMMIT AND CHAIN and ROLLBACK AND CHAIN.
Add VACUUM and CREATE TABLE options to prevent VACUUM from truncating trailing empty pages (Takayuki Tsunakawa) \u00a7 \u00a7
These options are vacuum_truncate and toast.vacuum_truncate. Use of these options reduces VACUUM's locking requirements, but prevents returning disk space to the operating system.
Allow VACUUM to skip index cleanup (Masahiko Sawada) \u00a7 \u00a7
This change adds a VACUUM command option INDEX_CLEANUP as well as a table storage option vacuum_index_cleanup. Use of this option reduces the ability to reclaim space and can lead to index bloat, but it is helpful when the main goal is to freeze old tuples.
Add the ability to skip VACUUM and ANALYZE operations on tables that cannot be locked immediately (Nathan Bossart) \u00a7
This option is called SKIP_LOCKED.
Allow VACUUM and ANALYZE to take optional Boolean argument specifications (Masahiko Sawada) \u00a7
Prevent TRUNCATE, VACUUM and ANALYZE from requesting a lock on tables for which the user lacks permission (Micha\u00ebl Paquier) \u00a7 \u00a7
This prevents unauthorized locking, which could interfere with user queries.
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This output can also be obtained when using auto_explain by setting auto_explain.log_settings.
Add OR REPLACE option to CREATE AGGREGATE (Andrew Gierth) \u00a7
Allow modifications of system catalogs' options using ALTER TABLE (Peter Eisentraut) \u00a7
\nModifications of catalogs' reloptions and autovacuum settings are now supported. (Setting allow_system_table_mods is still required.)
Use all key columns' names when selecting default constraint names for foreign keys (Peter Eisentraut) \u00a7
\nPreviously, only the first column name was included in the constraint name, resulting in ambiguity for multi-column foreign keys.
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\nThis fixes, for example, cases where psql would misformat output involving combining characters.
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\nThis adds word stemming support for Arabic, Indonesian, Irish, Lithuanian, Nepali, and Tamil to full text search.
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\nThis feature supports \u201cnondeterministic\u201d collations that can define case- and accent-agnostic equality comparisons. Thus, for example, a case-insensitive uniqueness constraint on a text column can be made more easily than before. This is only supported for ICU collations.
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\nThis allows customization of the collation rules in a consistent way across all ICU versions.
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\nType name now behaves much like a domain over type text that has default collation \u201cC\u201d. This allows cross-type comparisons to be processed more efficiently.
Add support for the SQL/JSON path language (Nikita Glukhov, Teodor Sigaev, Alexander Korotkov, Oleg Bartunov, Liudmila Mantrova) \u00a7 \u00a7 \u00a7
\nThis allows execution of complex queries on JSON values using an SQL-standard language.
Add support for hyperbolic functions (L\u00e6titia Avrot) \u00a7
\nAlso add log10() as an alias for log(), for standards compliance.
Improve the accuracy of statistical aggregates like variance() by using more precise algorithms (Dean Rasheed) \u00a7
Allow date_trunc() to have an additional argument to control the time zone (Vik Fearing, Tom Lane) \u00a7
This is faster and simpler than using the AT TIME ZONE clause.
Adjust to_timestamp()/to_date() functions to be more forgiving of template mismatches (Artur Zakirov, Alexander Korotkov, Liudmila Mantrova) \u00a7
This new behavior more closely matches the Oracle functions of the same name.
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\nSpecifically, in XMLTABLE, xpath(), and xmlexists(), fix some cases where nothing was output for a node, or an unexpected error was thrown, or necessary escaping of XML special characters was omitted.
Allow the BY VALUE clause in XMLEXISTS and XMLTABLE (Chapman Flack) \u00a7
This SQL-standard clause has no effect in PostgreSQL's implementation, but it was unnecessarily being rejected.
", "text": "Allow the BY VALUE clause in XMLEXISTS and XMLTABLE (Chapman Flack) \u00a7 This SQL-standard clause has no effect in PostgreSQL's implementation, but it was unnecessarily being rejected.", "title": "Allow the BY VALUE clause in XMLEXISTS and XMLTABLE", "commits": ["eaaa5986a"], "section": "Functions", "category": "feature", "source_url": "/docs/release/12.0/#id-1.11.6.28.5.7", "source_hash": "53fd6bf2caaa3dd4909b22afe47104fdfb3726df21e1ee9241198d58cff632de", "section_path": ["Functions"], "commit_groups": [["eaaa5986a"]], "identity_text": "Allow the BY VALUE clause in XMLEXISTS and XMLTABLE (Chapman Flack) This SQL-standard clause has no effect in PostgreSQL's implementation, but it was unnecessarily being rejected.", "commit_aliases": ["eaaa5986a"], "source_commits": ["eaaa5986a"], "source_entry_id": "12.0/changes/106", "db_id": "1c2383816f96a4e0dac5aded9ae8bb3e", "patch_ids": ["7b61764fb26efb36ac3ab940951c9504"], "statement_hash": "033adc62d1b77dcc18f6d69a5acd77a18eeb74482a2cd6d77977070d6a2abdbc", "relations": [], "category_label": "Features", "url": "/docs/compare/?release=12.0#12.0-ada7ec68084a03c2", "migration": false}, {"id": "12.0-6f7b752690058d32", "cves": [], "html": "Prevent current_schema() and current_schemas() from being run by parallel workers, as they are not parallel-safe (Micha\u00ebl Paquier) \u00a7
Allow RECORD and RECORD[] to be used as column types in a query's column definition list for a table function that is declared to return RECORD (Elvis Pranskevichus) \u00a7
Allow SQL commands and variables with the same names as those commands to be used in the same PL/pgSQL function (Tom Lane) \u00a7
\nFor example, allow a variable called comment to exist in a function that calls the COMMENT SQL command. Previously this combination caused a parse error.
Add new optional warning and error checks to PL/pgSQL (Pavel Stehule) \u00a7
\nThe new checks allow for run-time validation of INTO column counts and single-row results.
Add connection parameter tcp_user_timeout to control libpq's TCP timeout (Ryohei Nagaura) \u00a7
", "text": "Add connection parameter tcp_user_timeout to control libpq's TCP timeout (Ryohei Nagaura) \u00a7", "title": "Add connection parameter tcp_user_timeout to control libpq's TCP timeout", "commits": ["249d64999"], "section": "Client Interfaces", "category": "feature", "source_url": "/docs/release/12.0/#id-1.11.6.28.5.9", "source_hash": "ad6e36f035ab73c79bc69d12634ae19d75ef0384486d33345f1232e800e74696", "section_path": ["Client Interfaces"], "commit_groups": [["249d64999"]], "identity_text": "Add connection parameter libpq-tcp-user-timeout to control libpq's TCP timeout (Ryohei Nagaura)", "commit_aliases": ["249d64999"], "source_commits": ["249d64999"], "source_entry_id": "12.0/changes/111", "db_id": "6cdb02aaf10f70c32c4fa280b47ff16d", "patch_ids": ["e1d646e699a8d1ecb622399096f1c3c4"], "statement_hash": "b7aecfa776c3ce1693c6703745dfde3f8a502d30cff5487dafbb27e51f1eaec5", "relations": [{"rule": 2, "type": "related", "target": "0ed4ea34f97ff2c06b766fe41327709b", "evidence": {"same_day": true, "patch_ids": ["e1d646e699a8d1ecb622399096f1c3c4"], "ambiguous_patch_ids": ["e1d646e699a8d1ecb622399096f1c3c4"]}}], "category_label": "Features", "url": "/docs/compare/?release=12.0#12.0-f250a6e6a6a49ea7", "migration": false}, {"id": "12.0-610ebb3c8a33bb1f", "cves": [], "html": "Allow libpq (and thus psql) to report only the SQLSTATE value in error messages (Didier Gautheron) \u00a7
Add libpq function PQresultMemorySize() to report the memory used by a query result (Lars Kanis, Tom Lane) \u00a7
Remove the no-display/debug flag from libpq's options connection parameter (Peter Eisentraut) \u00a7
This allows this parameter to be set by postgres_fdw.
", "text": "Remove the no-display/debug flag from libpq's options connection parameter (Peter Eisentraut) \u00a7 This allows this parameter to be set by postgres_fdw.", "title": "Remove the no-display/debug flag from libpq's options connection parameter", "commits": ["1fea1e325"], "section": "Client Interfaces", "category": "feature", "source_url": "/docs/release/12.0/#id-1.11.6.28.5.9", "source_hash": "ea337f36889acd097c5f9da41d08fb6845f9d53571504fd177ef8cbccac74957", "section_path": ["Client Interfaces"], "commit_groups": [["1fea1e325"]], "identity_text": "Remove the no-display/debug flag from libpq's options connection parameter (Peter Eisentraut) This allows this parameter to be set by postgres_fdw.", "commit_aliases": ["1fea1e325"], "source_commits": ["1fea1e325"], "source_entry_id": "12.0/changes/114", "db_id": "8b21ccfc7ae0efc34381be889421dffa", "patch_ids": ["a654a979680d8eaa50e6aa436de3b2e0"], "statement_hash": "32ae72e5e513511ad52a620417361712771819e524a1a06cddd3540c2e7b542f", "relations": [], "category_label": "Features", "url": "/docs/compare/?release=12.0#12.0-5b1ad53be8e2a120", "migration": false}, {"id": "12.0-dbf1d8cedbbbf7b3", "cves": [], "html": "Allow ecpg to create variables of data type bytea (Ryo Matsumura) \u00a7
This allows ECPG clients to interact with bytea data directly, rather than using an encoded form.
Add PREPARE AS support to ECPG (Ryo Matsumura) \u00a7
Allow vacuumdb to select tables for vacuum based on their wraparound horizon (Nathan Bossart) \u00a7
\nThe options are --min-xid-age and --min-mxid-age.
Allow vacuumdb to disable waiting for locks or skipping all-visible pages (Nathan Bossart) \u00a7
\nThe options are --skip-locked and --disable-page-skipping.
Add colorization to the output of command-line utilities (Peter Eisentraut) \u00a7
\nThis is enabled by setting the environment variable PG_COLOR to always or auto. The specific colors used can be adjusted by setting the environment variable PG_COLORS, using ANSI escape codes for colors. For example, the default behavior is equivalent to PG_COLORS=\"error=01;31:warning=01;35:locus=01\".
Add CSV table output mode in psql (Daniel V\u00e9rit\u00e9) \u00a7
\nThis is controlled by \\pset format csv or the command-line --csv option.
Show the manual page URL in psql's \\help output for a SQL command (Peter Eisentraut) \u00a7
Display the IP address in psql's \\conninfo (Fabien Coelho) \u00a7 \u00a7
Improve tab completion of CREATE TABLE, CREATE TRIGGER, CREATE EVENT TRIGGER, ANALYZE, EXPLAIN, VACUUM, ALTER TABLE, ALTER INDEX, ALTER DATABASE, and ALTER INDEX ALTER COLUMN (Dagfinn Ilmari Manns\u00e5ker, Tatsuro Yamada, Micha\u00ebl Paquier, Tom Lane, Justin Pryzby) \u00a7 \u00a7 \u00a7 \u00a7 \u00a7 \u00a7 \u00a7 \u00a7 \u00a7
Allow values produced by queries to be assigned to pgbench variables (Fabien Coelho, \u00c1lvaro Herrera) \u00a7 \u00a7
\nThe command for this is \\gset.
Improve precision of pgbench's --rate option (Tom Lane) \u00a7
Improve pgbench's error reporting with clearer messages and return codes (Peter Eisentraut) \u00a7
", "text": "Improve pgbench's error reporting with clearer messages and return codes (Peter Eisentraut) \u00a7", "title": "Improve pgbench's error reporting with clearer messages and return codes", "commits": ["5b75a4f82"], "section": "Client Applications / pgbench", "category": "feature", "source_url": "/docs/release/12.0/#id-1.11.6.28.5.10.4", "source_hash": "70f56686a4d90fcbd387c0b3880333053689d2af5522739ca5dc24124a37be66", "section_path": ["Client Applications", "pgbench"], "commit_groups": [["5b75a4f82"]], "identity_text": "Improve pgbench's error reporting with clearer messages and return codes (Peter Eisentraut)", "commit_aliases": ["5b75a4f82"], "source_commits": ["5b75a4f82"], "source_entry_id": "12.0/changes/126", "db_id": "b34967b756cb0050557488269791fb73", "patch_ids": ["f15f2a5462dc93102decd67620d93b82"], "statement_hash": "8a5912671f6656f5c93b8c47474b3f29dd960b34e21089514d916517445b6b27", "relations": [], "category_label": "Features", "url": "/docs/compare/?release=12.0#12.0-011e01c868c7f840", "migration": false}, {"id": "12.0-576f974015ee4a7f", "cves": [], "html": "Allow control of log file rotation via pg_ctl (Kyotaro Horiguchi, Alexander Kuzmenkov, Alexander Korotkov) \u00a7
\nPreviously, this was only possible via an SQL function or a process signal.
", "text": "Allow control of log file rotation via pg_ctl (Kyotaro Horiguchi, Alexander Kuzmenkov, Alexander Korotkov) \u00a7 Previously, this was only possible via an SQL function or a process signal.", "title": "Allow control of log file rotation via pg_ctl", "commits": ["ec7436993"], "section": "Server Applications", "category": "feature", "source_url": "/docs/release/12.0/#id-1.11.6.28.5.11", "source_hash": "16669d62eb5a19dd4f555c3bc170e55b10d23bcc8bcc813489a55d510f7baf91", "section_path": ["Server Applications"], "commit_groups": [["ec7436993"]], "identity_text": "Allow control of log file rotation via app-pg-ctl (Kyotaro Horiguchi, Alexander Kuzmenkov, Alexander Korotkov) Previously, this was only possible via an SQL function or a process signal.", "commit_aliases": ["ec7436993"], "source_commits": ["ec7436993"], "source_entry_id": "12.0/changes/127", "db_id": "934eb313c54cc14112284a154340e81b", "patch_ids": ["4a36c7ccf2387c3538e7c7b7e59c0cf6"], "statement_hash": "7776d576c40eb2c163768f6b7f865d6981cd0aa190cc209087685b4aa258d61b", "relations": [], "category_label": "Features", "url": "/docs/compare/?release=12.0#12.0-576f974015ee4a7f", "migration": false}, {"id": "12.0-175cfb60fdbdbf14", "cves": [], "html": "Properly detach the new server process during pg_ctl start (Paul Guo) \u00a7
This prevents the server from being shut down if the shell script that invoked pg_ctl is interrupted later.
", "text": "Properly detach the new server process during pg_ctl start (Paul Guo) \u00a7 This prevents the server from being shut down if the shell script that invoked pg_ctl is interrupted later.", "title": "Properly detach the new server process during pg_ctl start", "commits": ["bb24439ce"], "section": "Server Applications", "category": "feature", "source_url": "/docs/release/12.0/#id-1.11.6.28.5.11", "source_hash": "869df87919811771d9d752021a5a11b17b77fbaaf27df4a6c2073f9437c3203c", "section_path": ["Server Applications"], "commit_groups": [["bb24439ce"]], "identity_text": "Properly detach the new server process during pg_ctl start (Paul Guo) This prevents the server from being shut down if the shell script that invoked pg_ctl is interrupted later.", "commit_aliases": ["bb24439ce"], "source_commits": ["bb24439ce"], "source_entry_id": "12.0/changes/128", "db_id": "c07f4ba6408ddca19d410c753094fd7f", "patch_ids": ["8a62b8bfc3713ca19b23e7d6cddf422a"], "statement_hash": "ab6fe4f2414ccb534c7abc0b7af4ae89621d429c666251db515d814a7126dd2e", "relations": [], "category_label": "Features", "url": "/docs/compare/?release=12.0#12.0-175cfb60fdbdbf14", "migration": false}, {"id": "12.0-fad36d5468e88dcc", "cves": [], "html": "Allow pg_upgrade to use the file system's cloning feature, if there is one (Peter Eisentraut) \u00a7
\nThe --clone option has the advantages of --link, while preventing the old cluster from being changed after the new cluster has started.
Allow specification of the socket directory to use in pg_upgrade (Daniel Gustafsson) \u00a7
\nThis is controlled by --socketdir; the default is the current directory.
Allow pg_checksums to disable fsync operations (Micha\u00ebl Paquier) \u00a7
\nThis is controlled by the --no-sync option.
Allow pg_rewind to disable fsync operations (Micha\u00ebl Paquier) \u00a7
", "text": "Allow pg_rewind to disable fsync operations (Micha\u00ebl Paquier) \u00a7", "title": "Allow pg_rewind to disable fsync operations", "commits": ["8a00b96aa"], "section": "Server Applications", "category": "feature", "source_url": "/docs/release/12.0/#id-1.11.6.28.5.11", "source_hash": "dfb8f3f1d38d48d98444aaa4ca07f33696c208af07b97398ab2936333c8a0cf8", "section_path": ["Server Applications"], "commit_groups": [["8a00b96aa"]], "identity_text": "Allow app-pgrewind to disable fsync operations (Micha\u00ebl Paquier)", "commit_aliases": ["8a00b96aa"], "source_commits": ["8a00b96aa"], "source_entry_id": "12.0/changes/132", "db_id": "1fe8a3d66d8a6cb9033efd97aa152e55", "patch_ids": ["235a28e7a91383eeabe77514336521e1"], "statement_hash": "77b62676357a372445263b021c8934b15694978bc72f6c972bce5d21dd9a6d8b", "relations": [], "category_label": "Features", "url": "/docs/compare/?release=12.0#12.0-ca6d790a1bcb1b7a", "migration": false}, {"id": "12.0-81a702f54eac0d3e", "cves": [], "html": "Fix pg_test_fsync to report accurate open_datasync durations on Windows (Laurenz Albe) \u00a7 \u00a7
When pg_dump emits data with INSERT commands rather than COPY, allow more than one data row to be included in each INSERT (Surafel Temesgen, David Rowley) \u00a7 \u00a7
The option controlling this is --rows-per-insert.
Allow pg_dump to emit INSERT ... ON CONFLICT DO NOTHING (Surafel Temesgen) \u00a7
This avoids conflict failures during restore. The option is --on-conflict-do-nothing.
Decouple the order of operations in a parallel pg_dump from the order used by a subsequent parallel pg_restore (Tom Lane) \u00a7
\nThis allows pg_restore to perform more-fully-parallelized parallel restores, especially in cases where the original dump was not done in parallel. Scheduling of a parallel pg_dump is also somewhat improved.
", "text": "Decouple the order of operations in a parallel pg_dump from the order used by a subsequent parallel pg_restore (Tom Lane) \u00a7 This allows pg_restore to perform more-fully-parallelized parallel restores, especially in cases where the original dump was not done in parallel. Scheduling of a parallel pg_dump is also somewhat improved.", "title": "Decouple the order of operations in a parallel pg_dump from the order used by a subsequent parallel pg_restore", "commits": ["548e50976"], "section": "Server Applications / pg_dump, pg_dumpall, pg_restore", "category": "feature", "source_url": "/docs/release/12.0/#id-1.11.6.28.5.11.3", "source_hash": "b778609f6a2763e9f4475773b79adc41cc02a954ecfc61c1caef41eed4584187", "section_path": ["Server Applications", "pg_dump, pg_dumpall, pg_restore"], "commit_groups": [["548e50976"]], "identity_text": "Decouple the order of operations in a parallel pg_dump from the order used by a subsequent parallel pg_restore (Tom Lane) This allows pg_restore to perform more-fully-parallelized parallel restores, especially in cases where the original dump was not done in parallel. Scheduling of a parallel pg_dump is also somewhat improved.", "commit_aliases": ["548e50976"], "source_commits": ["548e50976"], "source_entry_id": "12.0/changes/136", "db_id": "9ac2dd2d83983b11edb9741383f6d5a7", "patch_ids": ["2b44a3d19f343e081b49ab63e384aea9"], "statement_hash": "a271a2007dd879d7cba68b6cb44aefa78c027117dc7857af268d051c02a071af", "relations": [], "category_label": "Features", "url": "/docs/compare/?release=12.0#12.0-e8c9ec7ed4c84677", "migration": false}, {"id": "12.0-f9a5d05a4f9617fc", "cves": [], "html": "Allow the extra_float_digits setting to be specified for pg_dump and pg_dumpall (Andrew Dunstan) \u00a7
\nThis is primarily useful for making dumps that are exactly comparable across different source server versions. It is not recommended for normal use, as it may result in loss of precision when the dump is restored.
", "text": "Allow the extra_float_digits setting to be specified for pg_dump and pg_dumpall (Andrew Dunstan) \u00a7 This is primarily useful for making dumps that are exactly comparable across different source server versions. It is not recommended for normal use, as it may result in loss of precision when the dump is restored.", "title": "Allow the extra_float_digits setting to be specified for pg_dump and pg_dumpall", "commits": ["af25bc03e"], "section": "Server Applications / pg_dump, pg_dumpall, pg_restore", "category": "feature", "source_url": "/docs/release/12.0/#id-1.11.6.28.5.11.3", "source_hash": "e87a673e94faf5b17ec71709151920ef5d697d0b927230ebe35ee4be1b2b9311", "section_path": ["Server Applications", "pg_dump, pg_dumpall, pg_restore"], "commit_groups": [["af25bc03e"]], "identity_text": "Allow the guc-extra-float-digits setting to be specified for pg_dump and pg_dumpall (Andrew Dunstan) This is primarily useful for making dumps that are exactly comparable across different source server versions. It is not recommended for normal use, as it may result in loss of precision when the dump is restored.", "commit_aliases": ["af25bc03e"], "source_commits": ["af25bc03e"], "source_entry_id": "12.0/changes/137", "db_id": "95be938be35e54680ff3d63ac6955603", "patch_ids": ["655515ce83eaa999f57ae43f6863da7e"], "statement_hash": "3dbfd51c5a2c8e5b36cc76ebf5a33cd809201df0ba25fdcb2e368de839443455", "relations": [], "category_label": "Features", "url": "/docs/compare/?release=12.0#12.0-f9a5d05a4f9617fc", "migration": false}, {"id": "12.0-a1bd110b371aeb70", "cves": [], "html": "Add --exclude-database option to pg_dumpall (Andrew Dunstan) \u00a7
Add CREATE ACCESS METHOD command to create new table types (Andres Freund, Haribabu Kommi, \u00c1lvaro Herrera, Alexander Korotkov, Dmitry Dolgov) \u00a7 \u00a7 \u00a7 \u00a7 \u00a7 \u00a7 \u00a7 \u00a7 \u00a7
\nThis enables the development of new table access methods, which can optimize storage for different use cases. The existing heap access method remains the default.
Add planner support function interfaces to improve optimizer estimates, inlining, and indexing for functions (Tom Lane) \u00a7 \u00a7 \u00a7
\nThis allows extensions to create planner support functions that can provide function-specific selectivity, cost, and row-count estimates that can depend on the function's arguments. Support functions can also supply simplified representations and index conditions, greatly expanding optimization possibilities.
", "text": "Add planner support function interfaces to improve optimizer estimates, inlining, and indexing for functions (Tom Lane) \u00a7 \u00a7 \u00a7 This allows extensions to create planner support functions that can provide function-specific selectivity, cost, and row-count estimates that can depend on the function's arguments. Support functions can also supply simplified representations and index conditions, greatly expanding optimization possibilities.", "title": "Add planner support function interfaces to improve optimizer estimates, inlining, and indexing for functions", "commits": ["1fb57af92", "74dfe58a5", "a391ff3c3"], "section": "Source Code", "category": "feature", "source_url": "/docs/release/12.0/#id-1.11.6.28.5.12", "source_hash": "2fec88a66bdd20182d8857c17d339c0e810461d03c31f0b1cd0cd7d0a2dd20b9", "section_path": ["Source Code"], "commit_groups": [["1fb57af92"], ["74dfe58a5"], ["a391ff3c3"]], "identity_text": "Add planner support function interfaces to improve optimizer estimates, inlining, and indexing for functions (Tom Lane) This allows extensions to create planner support functions that can provide function-specific selectivity, cost, and row-count estimates that can depend on the function's arguments. Support functions can also supply simplified representations and index conditions, greatly expanding optimization possibilities.", "commit_aliases": ["1fb57af92", "74dfe58a5", "a391ff3c3"], "source_commits": ["1fb57af92", "74dfe58a5", "a391ff3c3"], "source_entry_id": "12.0/changes/140", "db_id": "852c2d9e0d22e1bfd695c303d812de98", "patch_ids": ["1eb34fc8eefc88301b430b0045e2baf2", "8bf46bad1becda768f3b1bcd39fec488", "beb0d0ab33e958d1b78c5b778cd98c9c"], "statement_hash": "978e917a3371935361250c11d7ef60692499766b0f17810b7c150afc1c7472e2", "relations": [], "category_label": "Features", "url": "/docs/compare/?release=12.0#12.0-cf52e70066c2817c", "migration": false}, {"id": "12.0-09471871203e0854", "cves": [], "html": "Simplify renumbering manually-assigned OIDs, and establish a new project policy for management of such OIDs (John Naylor, Tom Lane) \u00a7 \u00a7
\nPatches that manually assign OIDs for new built-in objects (such as new functions) should now randomly choose OIDs in the range 8000\u20149999. At the end of a development cycle, the OIDs used by committed patches will be renumbered down to lower numbers, currently somewhere in the 4xxx range, using the new renumber_oids.pl script. This approach should greatly reduce the odds of OID collisions between different in-process patches.
While there is no specific policy reserving any OIDs for external use, it is recommended that forks and other projects needing private manually-assigned OIDs use numbers in the high 7xxx range. This will avoid conflicts with recently-merged patches, and it should be a long time before the core project reaches that range.
Build Cygwin binaries using dynamic instead of static libraries (Marco Atzeri) \u00a7
", "text": "Build Cygwin binaries using dynamic instead of static libraries (Marco Atzeri) \u00a7", "title": "Build Cygwin binaries using dynamic instead of static libraries", "commits": ["a33245a85"], "section": "Source Code", "category": "feature", "source_url": "/docs/release/12.0/#id-1.11.6.28.5.12", "source_hash": "99a462b66670e9162f8c73812e6ed8c656020864d76be3acdb3c9ab15f243672", "section_path": ["Source Code"], "commit_groups": [["a33245a85"]], "identity_text": "Build Cygwin binaries using dynamic instead of static libraries (Marco Atzeri)", "commit_aliases": ["a33245a85"], "source_commits": ["a33245a85"], "source_entry_id": "12.0/changes/142", "db_id": "20a353f28edeb7257874c5db1e742db7", "patch_ids": ["eea6b33f6e0dc696b10101d55394ebca"], "statement_hash": "d14cdfc217efb96fb24258ce765d40fad38139b8d6b9ac317e02f2c296a44582", "relations": [], "category_label": "Features", "url": "/docs/compare/?release=12.0#12.0-0846ac0a23d159d6", "migration": false}, {"id": "12.0-341c6d96d93d73d7", "cves": [], "html": "Remove configure switch --disable-strong-random (Micha\u00ebl Paquier) \u00a7
A strong random-number source is now required.
", "text": "Remove configure switch --disable-strong-random (Micha\u00ebl Paquier) \u00a7 A strong random-number source is now required.", "title": "Remove configure switch --disable-strong-random", "commits": ["1707a0d2a"], "section": "Source Code", "category": "feature", "source_url": "/docs/release/12.0/#id-1.11.6.28.5.12", "source_hash": "d09c0da117ffce1bcfb621caf531a324c91a4a5581d39f158ae5bf353cea40e5", "section_path": ["Source Code"], "commit_groups": [["1707a0d2a"]], "identity_text": "Remove configure switch --disable-strong-random (Micha\u00ebl Paquier) A strong random-number source is now required.", "commit_aliases": ["1707a0d2a"], "source_commits": ["1707a0d2a"], "source_entry_id": "12.0/changes/143", "db_id": "b535a7440b1204745b0f1abe95eccc8b", "patch_ids": ["17ce59fac67f817920814a79409a8fc7"], "statement_hash": "b37340a826eca7e80380e0764f9da44a647b5171d9130756840887a924bbd337", "relations": [], "category_label": "Features", "url": "/docs/compare/?release=12.0#12.0-341c6d96d93d73d7", "migration": false}, {"id": "12.0-0dcb95e61a98e161", "cves": [], "html": "printf-family functions, as well as strerror and strerror_r, now behave uniformly across platforms within Postgres code (Tom Lane) \u00a7 \u00a7 \u00a7 \u00a7
Notably, printf understands %m everywhere; on Windows, strerror copes with Winsock error codes (it used to do so in backend but not frontend code); and strerror_r always follows the GNU return convention.
Require a C99-compliant compiler, and MSVC 2013 or later on Windows (Andres Freund) \u00a7
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\nThis affects only the INSTALL file generated during make dist and the seldom-used plain-text postgres.txt output file. Pandoc produces better output than lynx and avoids some locale/encoding issues. Pandoc version 1.13 or later is required.
Support use of images in the PostgreSQL documentation (J\u00fcrgen Purtz) \u00a7
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Improve optimizer cost accounting for postgres_fdw queries (Etsuro Fujita) \u00a7 \u00a7 \u00a7
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\nVersion 12 contains a number of changes that may affect compatibility with previous releases. Observe the following incompatibilities:
\n