January 2019
Beginner
556 pages
14h 19m
English
Content preview from Learning PostgreSQL 11 - Third Edition
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Data cleanup
Cleaning up bloated tables and indexes can be done by invoking the VACUUM FULL statement for tables and REINDEX for indexes; VACUUM FULL requires exclusive lock, which means there will be an outage and the table is not accessible. There are third-party tools, such as pg_repack, which can help in solving such issues.
You can take a look at the Bucardo check_postgres Nagios plugin code at https://bucardo.org/wiki/Check_postgres to understand how bloats in tables and indexes can be calculated. Another useful contribution module is pgstattuple, which contains many functions to get statistics about tuples. Refer to https://www.postgresql.org/docs/current/pgstattuple.html.
Cleaning up data is an important topic; often, the data life ...
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