ALTER INDEX — change the definition of an index
ALTER INDEXnameRENAME TOnew_nameALTER INDEXnameSET TABLESPACEtablespace_name
ALTER INDEX changes the definition of an existing index.
There are several subforms:
RENAME The RENAME form changes the name of the index.
There is no effect on the stored data.
SET TABLESPACEThis form changes the index's tablespace to the specified tablespace and moves the data file(s) associated with the index to the new tablespace. See also CREATE TABLESPACE.
nameThe name (possibly schema-qualified) of an existing index to alter.
new_nameNew name for the index.
tablespace_nameThe tablespace to which the index will be moved.
These operations are also possible using
ALTER TABLE.
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.