Re: sequence increment jumps?

On 1/25/07, John Smith <jayzee(dot)smith(at)gmail(dot)com> wrote:
> guys,
> i inserted 1 record into my database (default
> nextval('sequencename'::regclass) where (start 1 increment 1)). then i
> tried to insert 1 other record twice but both those inserts failed
> because of a domain check ("ERROR: value too long for type character
> varying(X)". when i was finally able to insert that record the
> sequence jumped 2 places. seems like it counted the failed inserts?

if you absolutely must have gapless identifiers in your database,
follow this procedure:
http://www.varlena.com/GeneralBits/130.php

as others have stated, sequences are (much) faster than rule/trigger
based solutions and have better concurrency.

merlin