DROP INDEX(7)            PostgreSQL 16.2 Documentation           DROP INDEX(7)

NAME
       DROP_INDEX - remove an index

SYNOPSIS
       DROP INDEX [ CONCURRENTLY ] [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]

DESCRIPTION
       DROP INDEX drops an existing index from the database system. To execute
       this command you must be the owner of the index.

PARAMETERS
       CONCURRENTLY
           Drop the index without locking out concurrent selects, inserts,
           updates, and deletes on the index's table. A normal DROP INDEX
           acquires an ACCESS EXCLUSIVE lock on the table, blocking other
           accesses until the index drop can be completed. With this option,
           the command instead waits until conflicting transactions have
           completed.

           There are several caveats to be aware of when using this option.
           Only one index name can be specified, and the CASCADE option is not
           supported. (Thus, an index that supports a UNIQUE or PRIMARY KEY
           constraint cannot be dropped this way.) Also, regular DROP INDEX
           commands can be performed within a transaction block, but DROP
           INDEX CONCURRENTLY cannot. Lastly, indexes on partitioned tables
           cannot be dropped using this option.

           For temporary tables, DROP INDEX is always non-concurrent, as no
           other session can access them, and non-concurrent index drop is
           cheaper.

       IF EXISTS
           Do not throw an error if the index does not exist. A notice is
           issued in this case.

       name
           The name (optionally schema-qualified) of an index to remove.

       CASCADE
           Automatically drop objects that depend on the index, and in turn
           all objects that depend on those objects (see Section 5.14).

       RESTRICT
           Refuse to drop the index if any objects depend on it. This is the
           default.

EXAMPLES
       This command will remove the index title_idx:

           DROP INDEX title_idx;

COMPATIBILITY
       DROP INDEX is a PostgreSQL language extension. There are no provisions
       for indexes in the SQL standard.

SEE ALSO
       CREATE INDEX (CREATE_INDEX(7))

PostgreSQL 16.2                      2024                        DROP INDEX(7)