PostgreSQL Storage Parameters

Controls usage of the B-tree deduplication technique described in Section 65.1.4.3 . Set to ON or OFF to enable or disable the optimization. (Alternative spellings of ON and OFF are allowed as described in Section 19.1 .) The default is ON .

Controls how full the index method will try to pack index pages. For B-trees, leaf pages are filled to this percentage during initial index builds, and also when extending the index at the right (adding new largest key values). If pages subsequently become completely full, they will be split, leading to fragmentation of the on-disk index structure. B-trees use a default fillfactor of 90, but any integer value from 10 to 100 can be selected.

Not recorded in the selected version.

Defines whether a summarization run is queued for the previous page range whenever an insertion is detected on the next one (see Section 65.5.1.1 for more details). The default is off .

Defines the number of table blocks that make up one block range for each entry of a BRIN index (see Section 65.5.1 for more details). The default is 128 .

Controls usage of the fast update technique described in Section 65.4.4.1 . ON enables fast update, OFF disables it. The default is ON .

Overrides the global setting of gin_pending_list_limit for this index. This value is specified in kilobytes.

Controls whether the buffered build technique described in Section 65.2.4.1 is used to build the index. With OFF buffering is disabled, with ON it is enabled, and with AUTO it is initially disabled, but is turned on on-the-fly once the index size reaches effective_cache_size . The default is AUTO . Note that if sorted build is possible, it will be used instead of buffered build unless buffering=ON is specified.

Controls how full the index method will try to pack index pages. For B-trees, leaf pages are filled to this percentage during initial index builds, and also when extending the index at the right (adding new largest key values). If pages subsequently become completely full, they will be split, leading to fragmentation of the on-disk index structure. B-trees use a default fillfactor of 90, but any integer value from 10 to 100 can be selected.

Controls how full the index method will try to pack index pages. For B-trees, leaf pages are filled to this percentage during initial index builds, and also when extending the index at the right (adding new largest key values). If pages subsequently become completely full, they will be split, leading to fragmentation of the on-disk index structure. B-trees use a default fillfactor of 90, but any integer value from 10 to 100 can be selected.

Controls how full the index method will try to pack index pages. For B-trees, leaf pages are filled to this percentage during initial index builds, and also when extending the index at the right (adding new largest key values). If pages subsequently become completely full, they will be split, leading to fragmentation of the on-disk index structure. B-trees use a default fillfactor of 90, but any integer value from 10 to 100 can be selected.

Enables or disables the autovacuum daemon for a particular table. If true, the autovacuum daemon will perform automatic VACUUM and/or ANALYZE operations on this table following the rules discussed in Section 24.1.6 . If false, this table will not be autovacuumed, except to prevent transaction ID wraparound. See Section 24.1.5 for more about wraparound prevention. Note that the autovacuum daemon does not run at all (except to prevent transaction ID wraparound) if the autovacuum parameter is false; setting individual tables' storage parameters does not override that. Therefore there is seldom much point in explicitly setting this storage parameter to true , only to false .

Per-table value for autovacuum_freeze_max_age parameter. Note that autovacuum will ignore per-table autovacuum_freeze_max_age parameters that are larger than the system-wide setting (it can only be set smaller).

Per-table value for vacuum_freeze_min_age parameter. Note that autovacuum will ignore per-table autovacuum_freeze_min_age parameters that are larger than half the system-wide autovacuum_freeze_max_age setting.

Per-table value for vacuum_freeze_table_age parameter.

Per-table value for autovacuum_multixact_freeze_max_age parameter. Note that autovacuum will ignore per-table autovacuum_multixact_freeze_max_age parameters that are larger than the system-wide setting (it can only be set smaller).

Per-table value for vacuum_multixact_freeze_min_age parameter. Note that autovacuum will ignore per-table autovacuum_multixact_freeze_min_age parameters that are larger than half the system-wide autovacuum_multixact_freeze_max_age setting.

Per-table value for vacuum_multixact_freeze_table_age parameter.

Per-table value for autovacuum_vacuum_cost_delay parameter.

Per-table value for autovacuum_vacuum_cost_limit parameter.

Per-table value for autovacuum_vacuum_insert_scale_factor parameter.

Per-table value for autovacuum_vacuum_insert_threshold parameter. The special value of -1 may be used to disable insert vacuums on the table.

Per-table value for autovacuum_vacuum_max_threshold parameter.

Per-table value for autovacuum_vacuum_scale_factor parameter.

Per-table value for autovacuum_vacuum_threshold parameter.

Per-table value for log_autovacuum_min_duration parameter.

Forces or disables index cleanup when VACUUM is run on this table. The default value is AUTO . With OFF , index cleanup is disabled, with ON it is enabled, and with AUTO a decision is made dynamically, each time VACUUM runs. The dynamic behavior allows VACUUM to avoid needlessly scanning indexes to remove very few dead tuples. Forcibly disabling all index cleanup can speed up VACUUM very significantly, but may also lead to severely bloated indexes if table modifications are frequent. The INDEX_CLEANUP parameter of VACUUM , if specified, overrides the value of this option.

Per-table value for vacuum_max_eager_freeze_failure_rate parameter.

Per-table value for vacuum_truncate parameter. The TRUNCATE parameter of VACUUM , if specified, overrides the value of this option.

This clause specifies optional storage parameters for a table or index; see Storage Parameters below for more information. For backward-compatibility the WITH clause for a table can also include OIDS=FALSE to specify that rows of the new table should not contain OIDs (object identifiers), OIDS=TRUE is not supported anymore.

Per-table value for autovacuum_analyze_scale_factor parameter.

Per-table value for autovacuum_analyze_threshold parameter.

Enables or disables the autovacuum daemon for a particular table. If true, the autovacuum daemon will perform automatic VACUUM and/or ANALYZE operations on this table following the rules discussed in Section 24.1.6 . If false, this table will not be autovacuumed, except to prevent transaction ID wraparound. See Section 24.1.5 for more about wraparound prevention. Note that the autovacuum daemon does not run at all (except to prevent transaction ID wraparound) if the autovacuum parameter is false; setting individual tables' storage parameters does not override that. Therefore there is seldom much point in explicitly setting this storage parameter to true , only to false .

Per-table value for autovacuum_freeze_max_age parameter. Note that autovacuum will ignore per-table autovacuum_freeze_max_age parameters that are larger than the system-wide setting (it can only be set smaller).

Per-table value for vacuum_freeze_min_age parameter. Note that autovacuum will ignore per-table autovacuum_freeze_min_age parameters that are larger than half the system-wide autovacuum_freeze_max_age setting.

Per-table value for vacuum_freeze_table_age parameter.

Per-table value for autovacuum_multixact_freeze_max_age parameter. Note that autovacuum will ignore per-table autovacuum_multixact_freeze_max_age parameters that are larger than the system-wide setting (it can only be set smaller).

Per-table value for vacuum_multixact_freeze_min_age parameter. Note that autovacuum will ignore per-table autovacuum_multixact_freeze_min_age parameters that are larger than half the system-wide autovacuum_multixact_freeze_max_age setting.

Per-table value for vacuum_multixact_freeze_table_age parameter.

Not recorded in the selected version.

Per-table value for autovacuum_vacuum_cost_delay parameter.

Per-table value for autovacuum_vacuum_cost_limit parameter.

Per-table value for autovacuum_vacuum_insert_scale_factor parameter.

Per-table value for autovacuum_vacuum_insert_threshold parameter. The special value of -1 may be used to disable insert vacuums on the table.

Per-table value for autovacuum_vacuum_max_threshold parameter.

Per-table value for autovacuum_vacuum_scale_factor parameter.

Per-table value for autovacuum_vacuum_threshold parameter.

The fillfactor for a table is a percentage between 10 and 100. 100 (complete packing) is the default. When a smaller fillfactor is specified, INSERT operations pack table pages only to the indicated percentage; the remaining space on each page is reserved for updating rows on that page. This gives UPDATE a chance to place the updated copy of a row on the same page as the original, which is more efficient than placing it on a different page, and makes heap-only tuple updates more likely. For a table whose entries are never updated, complete packing is the best choice, but in heavily updated tables smaller fillfactors are appropriate. This parameter cannot be set for TOAST tables.

Not recorded in the selected version.

Per-table value for log_autovacuum_min_duration parameter.

This sets the number of workers that should be used to assist a parallel scan of this table. If not set, the system will determine a value based on the relation size. The actual number of workers chosen by the planner or by utility statements that use parallel scans may be less, for example due to the setting of max_worker_processes .

The toast_tuple_target specifies the minimum tuple length required before we try to compress and/or move long column values into TOAST tables, and is also the target length we try to reduce the length below once toasting begins. This affects columns marked as External (for move), Main (for compression), or Extended (for both) and applies only to new tuples. There is no effect on existing rows. By default this parameter is set to allow at least 4 tuples per block, which with the default block size will be 2040 bytes. Valid values are between 128 bytes and the (block size - header), by default 8160 bytes. Changing this value may not be useful for very short or very long rows. Note that the default setting is often close to optimal, and it is possible that setting this parameter could have negative effects in some cases. This parameter cannot be set for TOAST tables.

Not recorded in the selected version.

Declare the table as an additional catalog table for purposes of logical replication. See Section 47.6.2 for details. This parameter cannot be set for TOAST tables.

Forces or disables index cleanup when VACUUM is run on this table. The default value is AUTO . With OFF , index cleanup is disabled, with ON it is enabled, and with AUTO a decision is made dynamically, each time VACUUM runs. The dynamic behavior allows VACUUM to avoid needlessly scanning indexes to remove very few dead tuples. Forcibly disabling all index cleanup can speed up VACUUM very significantly, but may also lead to severely bloated indexes if table modifications are frequent. The INDEX_CLEANUP parameter of VACUUM , if specified, overrides the value of this option.

Per-table value for vacuum_max_eager_freeze_failure_rate parameter.

Per-table value for vacuum_truncate parameter. The TRUNCATE parameter of VACUUM , if specified, overrides the value of this option.

This parameter may be either local or cascaded , and is equivalent to specifying WITH [ CASCADED | LOCAL ] CHECK OPTION (see below).

This should be used if the view is intended to provide row-level security. See Section 39.5 for full details.

This option causes the underlying base relations to be checked against the privileges of the user of the view rather than the view owner. See the notes below for full details.