DROP INDEX — remove an index
DROP INDEX [ CONCURRENTLY ] [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]
DROP INDEXdrops 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 INDEXacquires 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
CASCADEoption is not supported. (Thus, an index that supports a
PRIMARY KEYconstraint cannot be dropped this way.) Also, regular
DROP INDEXcommands can be performed within a transaction block, but
DROP INDEX CONCURRENTLYcannot.
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.
Refuse to drop the index if any objects depend on it. This is the default.
This command will remove the index
DROP INDEX title_idx;
DROP INDEXis a PostgreSQL language extension. There are no provisions for indexes in the SQL standard.