DROP INDEX(7) PostgreSQL 9.6.6 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, and in turn
all objects that depend on those objects (see Section 5.13,
"Dependency Tracking", in the documentation).
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 9.6.6 2017 DROP INDEX(7)
PostgreSQL 9.6.6 - Generated Sat Dec 2 08:51:24 CST 2017