Difference between revisions of "PostgreSQL VACUUM"
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↑ https://www.postgresql.org/docs/current/sql-vacuum.html
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| − | Examples | + | == Examples == |
| − | * <code>VACUUM (VERBOSE, ANALYZE) my_table;</code> | + | * <code>VACUUM (VERBOSE, [[ANALYZE]]) my_table;</code> |
| − | * <code>VACUUM FULL my_table;</code> | + | * <code>[[VACUUM FULL]] my_table;</code> |
SELECT | SELECT | ||
| Line 23: | Line 23: | ||
== News == | == News == | ||
| − | * [[PostgreSQL 13]] parallelized vacuuming of indexes | + | * [[PostgreSQL 13]] (Oct 2020) parallelized vacuuming of [[indexes]] |
| − | |||
| + | == Logs == | ||
| + | 2023-07-10 10:01:39 UTC [520415]: LOG: skipping [[vacuum]] of "your_test" --- [[lock not available]] | ||
== Related terms == | == Related terms == | ||
| Line 32: | Line 33: | ||
* [[Tuple]] | * [[Tuple]] | ||
* [[Redshift VACCUM]] | * [[Redshift VACCUM]] | ||
| + | * "plain" VACCUM | ||
| + | * [[Index Locking]] | ||
== See also == | == See also == | ||
Latest revision as of 10:32, 11 July 2023
PostgreSQL VACUUM garbage-collect and optionally analyze a database.
VACUUM reclaims storage occupied by dead tuples.
Contents
Examples[edit]
VACUUM (VERBOSE, ANALYZE) my_table;VACUUM FULL my_table;
SELECT schemaname, relname, last_vacuum, last_autovacuum, vacuum_count, autovacuum_count FROM pg_stat_user_tables;
select count(*) from pg_stat_activity where query like 'autovacuum:%';
PosgreSQL recommend that active production databases be vacuumed frequently (at least nightly), in order to remove dead rows. [1]
VACUUM causes a substantial increase in I/O traffic.
News[edit]
- PostgreSQL 13 (Oct 2020) parallelized vacuuming of indexes
Logs[edit]
2023-07-10 10:01:39 UTC [520415]: LOG: skipping vacuum of "your_test" --- lock not available
Related terms[edit]
- GIN indexes
- Autovacuum
- Tuple
- Redshift VACCUM
- "plain" VACCUM
- Index Locking
See also[edit]
- VACUUM: PostgreSQL VACUUM, Autovacuum,
pg_database, pg_stat_activity, Redshift VACUUM - PostgreSQL:
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