alter_sequence man page on aLinux

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ALTER SEQUENCE()		 SQL Commands		      ALTER SEQUENCE()

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 ]
       ALTER SEQUENCE name SET SCHEMA new_schema

DESCRIPTION
       ALTER  SEQUENCE	changes the parameters of an existing sequence genera‐
       tor. 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.

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	 main‐
	      tained.

       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  preallo‐
	      cated  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 behavior will be maintained.

       new_schema
	      The new schema for the sequence.

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 imme‐
       diately.

       Some variants of ALTER TABLE can be used with sequences	as  well;  for
       example, to rename a sequence use ALTER TABLE RENAME.

COMPATIBILITY
       ALTER  SEQUENCE conforms to the SQL standard, except for the SET SCHEMA
       variant, which is a PostgreSQL extension.

SQL - Language Statements	  2005-11-05		      ALTER SEQUENCE()
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