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Re: Streaming Replication Hooks

From: Sergey Konoplev <gray(dot)ru(at)gmail(dot)com>
To: David Fennell <david(dot)fennell(at)hospedia(dot)co(dot)uk>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: Streaming Replication Hooks
Date: 2012-03-15 12:12:09
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-admin
Probably you will find pg_last_xact_replay_timestamp() interesting. It
returns the timestamp of the last transaction (when the transaction
was commited) that was replayed on slave.

On Wed, Mar 14, 2012 at 9:47 PM, David Fennell
<david(dot)fennell(at)hospedia(dot)co(dot)uk> wrote:
> Hi All,
> I hope this is the correct mailing list to ask this question.
> We are setting up a system using postgresql 9.1 and streaming replication to
> copy reference data from a single central location to several remote sites.
> The database changes will come in clumps with long periods of no activity in
> between.  I would like to add some kind of programmatic hook to tell us that
> new changes have been received from central so that we can trigger messages
> to be sent out to devices on the site that may require updates of their data
> so that I don't have to rely on polling the database(s).
> Is there any way to hook at this point? Even if it didn't tell exactly what
> had changed, just that a particular database or table had been modified that
> would be perfect.  I don't mind what language is required either.
> I found reference to wal_sender and wal_receiver hooks which sounds very
> close to what I need, but I suspect that wal_receiver is processed before
> the data is applied to the database and I would like a hook after the
> database has been updated.
> I am assuming that normal triggers cannot be used on a replicated database?
> Can someone confirm or deny this?
> Thanks in advance.
> Dave Fennell

Sergey Konoplev

JID/GTalk: gray(dot)ru(at)gmail(dot)com Skype: gray-hemp

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