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DROP INDEX(7) PostgreSQL 9.5.0 Documentation DROP INDEX(7)
DROP_INDEX - remove an index
DROP INDEX [ CONCURRENTLY ] [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]
DROP INDEX drops an existing index from the database system. To execute
this command you must be the owner of the index.
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.
Do not throw an error if the index does not exist. A notice is
issued in this case.
The name (optionally schema-qualified) of an index to remove.
Automatically drop objects that depend on the index.
Refuse to drop the index if any objects depend on it. This is the
This command will remove the index title_idx:
DROP INDEX title_idx;
DROP INDEX is a PostgreSQL language extension. There are no provisions
for indexes in the SQL standard.
CREATE INDEX (CREATE_INDEX(7))
PostgreSQL 9.5.0 2016 DROP INDEX(7)