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DROP INDEX(7)           PostgreSQL 9.5.0 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.

       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.

       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 9.5.0                     2016                        DROP INDEX(7)