CREATE FUNCTION defines a new function. CREATE OR REPLACE FUNCTION will either create a new function, or replace an existing definition. To be able to define a function, the user must have the USAGE ...

A data change trigger is declared as a function with no arguments and a return type of trigger. Note that the function must be declared with no arguments even if it expects to receive some arguments ...

If you have pattern matching needs that go beyond this, consider writing a user-defined function in Perl or Tcl. While most regular-expression searches can be executed very quickly, regular ...

The first time a user-defined function in a particular loadable object file is called in a session, the dynamic loader loads that object file into memory so that the function can be called. The CREATE ...

Value expressions are used in a variety of contexts, such as in the target list of the SELECT command, as new column values in INSERT or UPDATE, or in search conditions in a number of commands. The ...

There are several password-based authentication methods. These methods operate similarly but differ in how the users' passwords are stored on the server and how the password provided by a client is ...

CREATE EXTENSION loads a new extension into the current database. There must not be an extension of the same name already loaded. Loading an extension requires the same privileges that would be ...

CREATE INDEX constructs an index on the specified column(s) of the specified table. Indexes are primarily used to enhance database performance (though inappropriate use can result in slower ...

ALTER LARGE OBJECT — change the definition of a large object ALTER MATERIALIZED VIEW — change the definition of a materialized view ALTER OPERATOR — change the definition of an operator ALTER OPERATOR ...

There are several settings that can cause the query planner not to generate a parallel query plan under any circumstances. In order for any parallel query plans whatsoever to be generated, the ...

pg_upgrade (formerly called pg_migrator) allows data stored in PostgreSQL data files to be upgraded to a later PostgreSQL major version without the data dump/restore ...

postmaster.opts A file recording the command-line options the server was last started with postmaster.pid A lock file recording the current postmaster process ID (PID), cluster data directory path, ...