Provided by: postgresql-client-8.0_8.0.7-2build1_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 ]
           [ RESTART [ WITH ] start ] [ CACHE cache ] [ [ NO ] CYCLE ]

DESCRIPTION

       ALTER   SEQUENCE   changes  the  parameters  of  an  existing  sequence
       generator. Any parameter not specifically set  in  the  ALTER  SEQUENCE
       command retains its prior setting.

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 RESTART WITH start changes the current value
              of the sequence.

       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 may 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 behaviour will be maintained.

EXAMPLES

       Restart a sequence called serial, at 105:

       ALTER SEQUENCE serial RESTART WITH 105;

NOTES

       To  avoid  blocking of concurrent transactions that obtain numbers from
       the same sequence, ALTER SEQUENCE is never  rolled  back;  the  changes
       take effect immediately and are not reversible.

       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 parameters.  The  current  backend  will  be  affected
       immediately.

COMPATIBILITY

       ALTER SEQUENCE conforms with SQL:2003.