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ALTER INDEX(7) PostgreSQL 9.5.0 Documentation ALTER INDEX(7)
ALTER_INDEX - change the definition of an index
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 ]
ALTER INDEX changes the definition of an existing index. There are
Do not throw an error if the index does not exist. A notice is
issued in this case.
The RENAME form changes the name of the index. There is no effect
on the stored data.
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.
The name (possibly schema-qualified) of an existing index to alter.
The new name for the index.
The tablespace to which the index will be moved.
The name of an index-method-specific storage parameter.
The new value for an index-method-specific storage parameter. This
might be a number or a word depending on the parameter.
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.
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
ALTER INDEX distributors SET (fillfactor = 75);
REINDEX INDEX distributors;
ALTER INDEX is a PostgreSQL extension.
CREATE INDEX (CREATE_INDEX(7)), REINDEX(7)
PostgreSQL 9.5.0 2016 ALTER INDEX(7)