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Two syscache identifiers are added for extension names and OIDs. Shared libraries of extensions might want to invalidate or update their own caches whenever a CREATE, ALTER or DROP EXTENSION command is run for their extension (in any backend). Right now this is non-trivial to do correctly and efficiently, but, if an extension catalog is part of a syscache, this could simply be done by registering an callback using CacheRegisterSyscacheCallback for the relevant syscache. Another case where this is useful is a loaded library where some of its code paths rely on some objects of the extension to exist; it can be simpler and more efficient to do an existence check directly on the extension through the syscache. Author: Jelte Fennema-Nio Reviewed-by: Alexander Korotkov, Pavel Stehule Discussion: https://postgr.es/m/CAGECzQTWm9sex719Hptbq4j56hBGUti7J9OWjeMobQ1ccRok9w@mail.gmail.com
PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.