1DROP INDEX(7)            PostgreSQL 15.4 Documentation           DROP INDEX(7)
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NAME

6       DROP_INDEX - remove an index
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SYNOPSIS

9       DROP INDEX [ CONCURRENTLY ] [ IF EXISTS ] name [, ...] [ CASCADE | RESTRICT ]
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DESCRIPTION

12       DROP INDEX drops an existing index from the database system. To execute
13       this command you must be the owner of the index.
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PARAMETERS

16       CONCURRENTLY
17           Drop the index without locking out concurrent selects, inserts,
18           updates, and deletes on the index's table. A normal DROP INDEX
19           acquires an ACCESS EXCLUSIVE lock on the table, blocking other
20           accesses until the index drop can be completed. With this option,
21           the command instead waits until conflicting transactions have
22           completed.
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24           There are several caveats to be aware of when using this option.
25           Only one index name can be specified, and the CASCADE option is not
26           supported. (Thus, an index that supports a UNIQUE or PRIMARY KEY
27           constraint cannot be dropped this way.) Also, regular DROP INDEX
28           commands can be performed within a transaction block, but DROP
29           INDEX CONCURRENTLY cannot. Lastly, indexes on partitioned tables
30           cannot be dropped using this option.
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32           For temporary tables, DROP INDEX is always non-concurrent, as no
33           other session can access them, and non-concurrent index drop is
34           cheaper.
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36       IF EXISTS
37           Do not throw an error if the index does not exist. A notice is
38           issued in this case.
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40       name
41           The name (optionally schema-qualified) of an index to remove.
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43       CASCADE
44           Automatically drop objects that depend on the index, and in turn
45           all objects that depend on those objects (see Section 5.14).
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47       RESTRICT
48           Refuse to drop the index if any objects depend on it. This is the
49           default.
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EXAMPLES

52       This command will remove the index title_idx:
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54           DROP INDEX title_idx;
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COMPATIBILITY

57       DROP INDEX is a PostgreSQL language extension. There are no provisions
58       for indexes in the SQL standard.
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SEE ALSO

61       CREATE INDEX (CREATE_INDEX(7))
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65PostgreSQL 15.4                      2023                        DROP INDEX(7)
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