Hi, Heikki Linnakangas írta: > 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. >
I guessed so, I intended to collect the xl_xid values in a cache array and check periodically. > What are you trying to do? > Synchronous replication. :-) Best regards, Zoltán Böszörményi -- Bible has answers for everything. Proof: "But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil." (Matthew 5:37) - basics of digital technology. "May your kingdom come" - superficial description of plate tectonics ---------------------------------- Zoltán Böszörményi Cybertec Schönig & Schönig GmbH http://www.postgresql.at/ -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
