Re: Sequence Current Value Resetting

Twice a year we import class information into table class. My first
time doing this was with the spring import in August and the import
failed because the Current Value was less than the Max ID in the table.
I changed the Current Value to the Max ID and was able to do the import.
After the import, the new Current Value matched the Max ID and I thought
I had solved my problem. I did not expect any problem today when I when
to do the fall import. I was unable to do the import and discovered
that the Current Value was 156 less than the Max ID. I advanced the
current value to 21557, was able to import 276 rows, and the current
value properly became 21832. Any thoughts as to why this value keeps
"slipping?" Thanks.

Property Value

----- -----

Name tblclass_classid_seq

OID 23937

Owner dbdevel

ACL
(dbdevel=awrdRxt/dbdevel,jboss=arwd/dbdevel)

Current Value 21832

Minimum 1

Maximum 9223372036854775807

Increment 1

Cache 1

Cycled No

System sequence? No

Comment

-- Sequence: tblclass_classid_seq

-- DROP SEQUENCE tblclass_classid_seq;

CREATE SEQUENCE tblclass_classid_seq

INCREMENT 1

MINVALUE 1

MAXVALUE 9223372036854775807

START 21832

CACHE 1;

ALTER TABLE tblclass_classid_seq OWNER TO dbdevel;

GRANT ALL ON TABLE tblclass_classid_seq TO dbdevel;

GRANT SELECT, UPDATE, INSERT, DELETE ON TABLE tblclass_classid_seq TO
jboss;

On Apr 4, 2006, at 2:02 PM, Douglas Doolittle wrote:

> Twice a year we import class information into table class. My
> first time doing this was with the spring import in August and the
> import failed because the Current Value was less than the Max ID in
> the table. I changed the Current Value to the Max ID and was able
> to do the import. After the import, the new Current Value matched
> the Max ID and I thought I had solved my problem. I did not expect
> any problem today when I when to do the fall import. I was unable
> to do the import and discovered that the Current Value was 156 less
> than the Max ID. I advanced the current value to 21557, was able
> to import 276 rows, and the current value properly became 21832.
> Any thoughts as to why this value keeps “slipping?” Thanks.

I doubt there is anything wrong with the sequence. Do the records you
are importing already have an which could be coming from somewhere
other than the sequence you mentioned? If the imported records have a
value for this column, the sequence will not be advanced. Are you
doing inserts anywhere where the ID value is provided rather than
using the sequence value?

John DeSoi, Ph.D.
http://pgedit.com/
Power Tools for PostgreSQL