Re: How to get the value in the lastvalue field

If I was you, I would assign separate non-overlapping sequence ranges
for all servers from start. The ranges should be sized considering what
traffic each server will have. When one of the servers is close to use
up it's sequence range, assign it another one...
Then you will always know that one or other record is coming from which
server, and don't need to care when moving between servers. All other
scenarios are error prone.

Cheers,
Csaba.

On Wed, 2005-10-26 at 14:42, Venki wrote:
> Hi
> thanks for the replies. The situation is as follows. We get backups
> from the production server and update the local database in the
> local server but each time when we restore the database backup the
> sequence values are not getting updated properly. So what i thought
> was to write a function which will check the last value of the row in
> the table and compare it with the lastvalue of the sequnce and if it
> is not proper then update the lastvalue of the sequence to a proper
> value.
>
> I Hope that i have explained the situation properly. If you have any
> other suggestion it will be greatly helpful as we are new to postgres
> and might be doing something wrong when restoring the database.
>
> Regards
> venki
>
> -------Original Message-------
>
> From: Csaba Nagy
> Date: 10/26/05 18:24:48
> To: Venki
> Cc: Postgres general mailing list
> Subject: Re: [GENERAL] How to get the value in the lastvalue field
>
> You can select it from the sequence's associated relation as from any
> table... try:
>
> select * from sequence_name;
>
> However, be aware that what you see there is the situation only in
> your
> transaction, and it is very possible that other transactions will use
> higher values concurrently. So it really depends on what you want to
> do
> if it is actually safe to do it this way...
>
> Cheers,
> Csaba.
>
>
> On Wed, 2005-10-26 at 14:23, Venki wrote:
> > Hi,
> > Can anyone in the list tell me how to get the value in the lastvalue
> > field of a sequence. I tried
> >
> > select currval('field_seq');
> >
> > but got an error message
> >
> > ERROR: currval of sequence "field_seq" is not yet defined in this
> > session.
> >
> > I think currval will work only after an insert. I don't want to use
> > nextval as this increases the lastvalue value.
> >
> >
> >
> > Thanks in advance
> >
> > Kind Regards,
> > Venki
> >
> >
> >
> >
> >
> >
>
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>