Provided by: postgresql-client-9.1_9.1.1-1_i386 bug

NAME

       ALTER_SEQUENCE - change the definition of a sequence generator

SYNOPSIS

       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

DESCRIPTION

       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 anyway.)

PARAMETERS

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

       increment
           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
           maintained.

       minvalue, NO MINVALUE
           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.

       maxvalue, NO MAXVALUE
           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.

       restart
           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, OWNED BY NONE
           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".

       new_owner
           The user name of the new owner of the sequence.

       new_name
           The new name for the sequence.

       new_schema
           The new schema for the sequence.

NOTES

       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
       back.

       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.

EXAMPLES

       Restart a sequence called serial, at 105:

           ALTER SEQUENCE serial RESTART WITH 105;

COMPATIBILITY

       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.

SEE ALSO

       CREATE SEQUENCE (CREATE_SEQUENCE(7)), DROP SEQUENCE (DROP_SEQUENCE(7))