Man Linux: Main Page and Category List


       ALTER SEQUENCE - change the definition of a sequence generator


       ALTER SEQUENCE name [ INCREMENT [ BY ] increment ]
           [ MINVALUE minvalue | NO MINVALUE ] [ MAXVALUE maxvalue | NO MAXVALUE ]
           [ START [ WITH ] start ]
           [ RESTART [ [ WITH ] restart ] ]
           [ CACHE cache ] [ [ NO ] CYCLE ]
           [ OWNED BY { table.column | NONE } ]
       ALTER SEQUENCE name OWNER TO new_owner
       ALTER SEQUENCE name RENAME TO new_name
       ALTER SEQUENCE name SET SCHEMA new_schema


       ALTER   SEQUENCE   changes  the  parameters  of  an  existing  sequence
       generator. Any parameters not specifically set in  the  ALTER  SEQUENCE
       command retain their prior settings.

       You  must  own  the  sequence  to  use  ALTER  SEQUENCE.   To  change a
       sequence’s schema, you must also  have  CREATE  privilege  on  the  new
       schema.   To  alter  the  owner,  you must also be a direct or indirect
       member of the new owning role, and that role must have CREATE privilege
       on the sequence’s schema. (These restrictions enforce that altering the
       owner doesn’t do anything you couldn’t do by  dropping  and  recreating
       the sequence.  However, a superuser can alter ownership of any sequence


       name   The name (optionally  schema-qualified)  of  a  sequence  to  be

              The  clause INCREMENT BY increment is optional. A positive value
              will make an ascending sequence, a  negative  one  a  descending
              sequence.  If  unspecified,  the  old  increment  value  will be


              The optional clause MINVALUE  minvalue  determines  the  minimum
              value  a sequence can generate. If NO MINVALUE is specified, the
              defaults of 1 and -263-1 for ascending and descending sequences,
              respectively,  will be used. If neither option is specified, the
              current minimum value will be maintained.


              The optional clause MAXVALUE  maxvalue  determines  the  maximum
              value  for  the  sequence.  If  NO  MAXVALUE  is  specified, the
              defaults  are  263-1  and  -1  for  ascending   and   descending
              sequences,  respectively,  will  be  used.  If neither option is
              specified, the current maximum value will be maintained.

       start  The optional clause START WITH start changes the recorded  start
              value  of  the  sequence.  This  has  no  effect  on the current
              sequence value; it simply  sets  the  value  that  future  ALTER
              SEQUENCE RESTART commands will use.

              The optional clause RESTART [ WITH restart ] changes the current
              value of the sequence. This is equivalent to calling the  setval
              function  with  is_called  =  false: the specified value will be
              returned by the next call of nextval.  Writing RESTART  with  no
              restart  value  is  equivalent to supplying the start value that
              was recorded by CREATE SEQUENCE or last set  by  ALTER  SEQUENCE
              START WITH.

       cache  The   clause   CACHE   cache  enables  sequence  numbers  to  be
              preallocated and stored in memory for faster access. The minimum
              value  is 1 (only one value can be generated at a time, i.e., no
              cache). If unspecified, the old cache value will be  maintained.

       CYCLE  The  optional  CYCLE key word can be used to enable the sequence
              to wrap around when the maxvalue or minvalue has been reached by
              an  ascending  or descending sequence respectively. If the limit
              is reached, the next number generated will be  the  minvalue  or
              maxvalue, respectively.

       NO CYCLE
              If  the  optional  NO  CYCLE key word is specified, any calls to
              nextval after the sequence has reached its  maximum  value  will
              return  an  error.   If neither CYCLE or NO CYCLE are specified,
              the old cycle behavior will be maintained.

       OWNED BY table.column

              The OWNED BY option causes the sequence to be associated with  a
              specific  table  column,  such that if that column (or its whole
              table) is dropped, the sequence will be automatically dropped as
              well.  If  specified,  this  association replaces any previously
              specified association for the sequence. The specified table must
              have  the  same owner and be in the same schema as the sequence.
              Specifying OWNED  BY  NONE  removes  any  existing  association,
              making the sequence ‘‘free-standing’’.

              The user name of the new owner of the sequence.

              The new name for the sequence.

              The new schema for the sequence.


       To  avoid  blocking of concurrent transactions that obtain numbers from
       the same sequence, ALTER SEQUENCE’s effects on the sequence  generation
       parameters are never rolled back; those changes take effect immediately
       and are not reversible. However, the OWNED BY, OWNER TO, RENAME TO, and
       SET  SCHEMA  clauses  cause ordinary catalog updates that can be rolled

       ALTER SEQUENCE will not immediately affect nextval results in backends,
       other  than  the  current one, that have preallocated (cached) sequence
       values. They will use up  all  cached  values  prior  to  noticing  the
       changed  sequence  generation  parameters.  The current backend will be
       affected immediately.

       ALTER SEQUENCE does not affect the currval  status  for  the  sequence.
       (Before PostgreSQL 8.3, it sometimes did.)

       For historical reasons, ALTER TABLE can be used with sequences too; but
       the only variants of ALTER TABLE that are allowed  with  sequences  are
       equivalent to the forms shown above.


       Restart a sequence called serial, at 105:



       ALTER SEQUENCE conforms to the SQL standard, except for the START WITH,
       OWNED BY, OWNER TO, RENAME  TO,  and  SET  SCHEMA  clauses,  which  are
       PostgreSQL extensions.


       CREATE SEQUENCE [create_sequence(7)], DROP SEQUENCE [drop_sequence(7)]