its processing. This form of the command can operate in parallel … Furthermore, except when performing an aggressive vacuum, some pages may be skipped in order to avoid waiting for other sessions to finish using them.

your experience with the particular feature or requires further clarification, With no parameter, VACUUM processes every table in the current database that the current user has permission to vacuum. This form of the command can operate in parallel with normal reading and writing of the table, as an exclusive lock is not obtained. not obtained. VACUUM FULL will usually shrink the table more than a plain VACUUM would.

Selects “full” vacuum, which can reclaim more space, but takes much longer and exclusively locks the table. This is a handy combination form for routine maintenance scripts. Copyright © 1996-2020 The PostgreSQL Global Development Group. extensive processing, including moving of tuples across blocks to

unvacuumed. Various statistics about the tables are printed as well. If this option is specified with the ANALYZE option, it does not affect ANALYZE. Specifies that VACUUM should attempt to remove index entries pointing to dead tuples.

Pages where all tuples are known to be frozen can always be skipped, and those where all tuples are known to be visible to all transactions may be skipped except when performing an aggressive vacuum. The FULL option is not recommended for routine use, but might be useful in special cases.

Therefore it's necessary to do VACUUM periodically, especially on frequently-updated tables. After adding or deleting a large number of rows, it might be a good idea to issue a VACUUM ANALYZE command for the affected table. Defaults to all tables in the current The boolean value can also be omitted, in which case TRUE is assumed. When VERBOSE is specified, VACUUM emits progress messages to indicate which table is currently being processed. table while it is being processed. combination form for routine maintenance scripts. Specifies whether the selected option should be turned on or off.

Selects "full" vacuum, which For more information about automatic and manual vacuuming, see Section 24.1. (The restriction for shared catalogs means that a true database-wide VACUUM can only be performed by a superuser.) To vacuum a table, one must ordinarily be the table's owner or a superuser. for re-use. This is a handy The FULL option is not recommended for This documentation is for an unsupported version of PostgreSQL. please use PostgreSQL includes an “autovacuum” facility which can automate routine vacuum maintenance.

Selects "full" vacuum, which can reclaim more space, but takes much longer and exclusively locks the table. deleted tuples.

It is possible for a vacuum to run with fewer workers than specified, or even with no workers at all. After adding or deleting a large number of rows, it might be a good idea to issue a VACUUM ANALYZE command for the affected table.

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