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PL/Perl is a loadable procedural language that enables you to write PostgreSQL functions in the Perl programming language.
To install PL/Perl in a particular database, use createlang plperl dbname.
Tip: If a language is installed into template1, all subsequently created databases will have the language installed automatically.
Note: Users of source packages must specially enable the build of PL/Perl during the installation process. (Refer to Section 14.1 for more information.) Users of binary packages might find PL/Perl in a separate subpackage.