DROP INDEX
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, and in turn all objects that depend on those objects (see Section 5.13).
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.