PostgreSQL VACUUM

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PostgreSQL VACUUM garbage-collect and optionally analyze a database.

VACUUM reclaims storage occupied by dead tuples.


Examples:

  • 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]

Related terms[edit]

See also[edit]

  • https://www.postgresql.org/docs/current/sql-vacuum.html
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