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       ALTER INDEX - change the definition of an index


       ALTER INDEX name RENAME TO new_name
       ALTER INDEX name SET TABLESPACE tablespace_name
       ALTER INDEX name SET ( storage_parameter = value [, ... ] )
       ALTER INDEX name RESET ( storage_parameter [, ... ] )


       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.

              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.    See   also   CREATE   TABLESPACE

       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 [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.


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

              The new name for the index.

              The tablespace to which the index will be moved.

              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.


       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
       supports it):

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


       ALTER INDEX is a PostgreSQL extension.


       CREATE INDEX [create_index(7)], REINDEX [reindex(7)]