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PG.CENTER connects PostgreSQL documentation, reference, and ecosystem knowledge. Maintained by Pigsty.

Supported versions: Current (18) / 17 / 16 / 15 / 14
Development versions: 19 / devel
Unsupported versions: 13 / 12 / 11 / 10 / 9.6 / 9.5 / 9.4 / 9.3 / 9.2 / 9.1 / 9.0 / 8.4 / 8.3 / 8.2 / 8.1 / 8.0
Historical version. PostgreSQL 9.6 reached end of support in November 2021. See the current version for supported releases.
PostgreSQL 9.6.24 Documentation
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H.4. Extensions

PostgreSQL is designed to be easily extensible. For this reason, extensions loaded into the database can function just like features that are built in. The contrib/ directory shipped with the source code contains several extensions, which are described in Appendix F. Other extensions are developed independently, like PostGIS. Even PostgreSQL replication solutions can be developed externally. For example, Slony-I is a popular master/standby replication solution that is developed independently from the core project.

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Read the upstream documentation. For corrections, first check the current version.