| From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
|---|---|
| To: | Boszormenyi Zoltan <zb(at)cybertec(dot)at> |
| Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Hans-Juergen Schoenig <hs(at)cybertec(dot)at> |
| Subject: | Re: Question about WAL and XID |
| Date: | 2010-04-06 09:00:15 |
| Message-ID: | 4BBAF81F.8000509@enterprisedb.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
Boszormenyi Zoltan wrote:
> am I right that an XID is global across the whole DB cluster
> under the same $PGDATA?
Yes.
> I am asking this because I need to check
> TransactionIdDidCommit(XLogRecord->xl_xid)
> from the walreciver. Can I expect it to work on any
> xl_xid that walreceiver encounters?
Walreceiver is only responsible for receiving the WAL from the master
server, and write to disk. It doesn't apply the log, it doesn't look
into the contents at all. So TransactionIdDidCommit(XLogRecord->xl_xid)
always returns false on WAL it has received, because it hasn't been
applied yet.
What are you trying to do?
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Boszormenyi Zoltan | 2010-04-06 09:08:47 | Re: Question about WAL and XID |
| Previous Message | Andrew Dunstan | 2010-04-06 08:59:58 | Re: Prepared query parsing much slower in 9.0? |