Difference between revisions of "PostgreSQL VACUUM"
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| − | PostgreSQL VACUUM [[garbage-collect]] and optionally analyze a database. | + | PostgreSQL [[VACUUM]] [[garbage-collect]] and optionally analyze a database. |
* https://www.postgresql.org/docs/current/sql-vacuum.html | * https://www.postgresql.org/docs/current/sql-vacuum.html | ||
| Line 5: | Line 5: | ||
| − | Examples | + | == Examples == |
| − | * <code>VACUUM (VERBOSE, ANALYZE) my_table;</code> | + | * <code>VACUUM (VERBOSE, [[ANALYZE]]) my_table;</code> |
| − | + | * <code>[[VACUUM FULL]] my_table;</code> | |
SELECT | SELECT | ||
| Line 15: | Line 15: | ||
FROM [[pg_stat_user_tables]]; | FROM [[pg_stat_user_tables]]; | ||
| − | select count(*) from [[pg_stat_activity]] where query like 'autovacuum:%'; | + | [[select count]](*) from [[pg_stat_activity]] where query like '[[autovacuum]]:%'; |
| Line 21: | Line 21: | ||
VACUUM causes a substantial increase in [[I/O]] traffic. | VACUUM causes a substantial increase in [[I/O]] traffic. | ||
| + | |||
| + | == News == | ||
| + | * [[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 26: | Line 32: | ||
* [[Autovacuum]] | * [[Autovacuum]] | ||
* [[Tuple]] | * [[Tuple]] | ||
| + | * [[Redshift VACCUM]] | ||
| + | * "plain" VACCUM | ||
| + | * [[Index Locking]] | ||
== See also == | == See also == | ||
| + | * {{VACUUM}} | ||
* {{PostgreSQL}} | * {{PostgreSQL}} | ||
[[Category:PostgreSQL]] | [[Category:PostgreSQL]] | ||
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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