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))