12th September 2019: PostgreSQL 12 Beta 4 Released!
Supported Versions: Current (11) / 10 / 9.6 / 9.5 / 9.4
Development Versions: 12 / devel
Unsupported versions: 9.3 / 9.2 / 9.1 / 9.0 / 8.4 / 8.3 / 8.2 / 8.1 / 8.0 / 7.4 / 7.3
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You may want to view the same page for the current version, or one of the supported versions listed above instead.

21.2. Routine Reindexing

In some situations it is worthwhile to rebuild indexes periodically with the REINDEX command. (There is also contrib/reindexdb which can reindex an entire database.) However, PostgreSQL 7.4 has substantially reduced the need for this activity compared to earlier releases.