DROP INDEX(7)                     PostgreSQL 12.3 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 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.

           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 12.3                                2020                                 DROP INDEX(7)