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ALTER INDEX(7)          PostgreSQL 9.5.0 Documentation          ALTER INDEX(7)

NAME
       ALTER_INDEX - change the definition of an index

SYNOPSIS
       ALTER INDEX [ IF EXISTS ] name RENAME TO new_name
       ALTER INDEX [ IF EXISTS ] name SET TABLESPACE tablespace_name
       ALTER INDEX [ IF EXISTS ] name SET ( storage_parameter = value [, ... ] )
       ALTER INDEX [ IF EXISTS ] name RESET ( storage_parameter [, ... ] )
       ALTER INDEX ALL IN TABLESPACE name [ OWNED BY role_name [, ... ] ]
           SET TABLESPACE new_tablespace [ NOWAIT ]

DESCRIPTION
       ALTER INDEX changes the definition of an existing index. There are
       several subforms:

       IF EXISTS
           Do not throw an error if the index does not exist. A notice is
           issued in this case.

       RENAME
           The RENAME form changes the name of the index. There is no effect
           on the stored data.

       SET TABLESPACE
           This form changes the index's tablespace to the specified
           tablespace and moves the data file(s) associated with the index to
           the new tablespace. To change the tablespace of an index, you must
           own the index and have CREATE privilege on the new tablespace. All
           indexes in the current database in a tablespace can be moved by
           using the ALL IN TABLESPACE form, which will lock all indexes to be
           moved and then move each one. This form also supports OWNED BY,
           which will only move indexes owned by the roles specified. If the
           NOWAIT option is specified then the command will fail if it is
           unable to acquire all of the locks required immediately. Note that
           system catalogs will not be moved by this command, use ALTER
           DATABASE or explicit ALTER INDEX invocations instead if desired.
           See also CREATE TABLESPACE (CREATE_TABLESPACE(7)).

       SET ( storage_parameter = value [, ... ] )
           This form changes one or more index-method-specific storage
           parameters for the index. See CREATE INDEX (CREATE_INDEX(7)) for
           details on the available parameters. Note that the index contents
           will not be modified immediately by this command; depending on the
           parameter you might need to rebuild the index with REINDEX(7) to
           get the desired effects.

       RESET ( storage_parameter [, ... ] )
           This form resets one or more index-method-specific storage
           parameters to their defaults. As with SET, a REINDEX might be
           needed to update the index entirely.

PARAMETERS
       name
           The name (possibly schema-qualified) of an existing index to alter.

       new_name
           The new name for the index.

       tablespace_name
           The tablespace to which the index will be moved.

       storage_parameter
           The name of an index-method-specific storage parameter.

       value
           The new value for an index-method-specific storage parameter. This
           might be a number or a word depending on the parameter.

NOTES
       These operations are also possible using ALTER TABLE (ALTER_TABLE(7)).
       ALTER INDEX is in fact just an alias for the forms of ALTER TABLE that
       apply to indexes.

       There was formerly an ALTER INDEX OWNER variant, but this is now
       ignored (with a warning). An index cannot have an owner different from
       its table's owner. Changing the table's owner automatically changes the
       index as well.

       Changing any part of a system catalog index is not permitted.

EXAMPLES
       To rename an existing index:

           ALTER INDEX distributors RENAME TO suppliers;

       To move an index to a different tablespace:

           ALTER INDEX distributors SET TABLESPACE fasttablespace;

       To change an index's fill factor (assuming that the index method
       supports it):

           ALTER INDEX distributors SET (fillfactor = 75);
           REINDEX INDEX distributors;

COMPATIBILITY
       ALTER INDEX is a PostgreSQL extension.

SEE ALSO
       CREATE INDEX (CREATE_INDEX(7)), REINDEX(7)

PostgreSQL 9.5.0                     2016                       ALTER INDEX(7)