| From: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com> |
|---|---|
| To: | Chris Redekop <chris(at)replicon(dot)com> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: master-side counterpart of pg_last_xact_replay_timestamp? |
| Date: | 2011-09-08 05:43:18 |
| Message-ID: | CAHGQGwGcuA2Lv06yw-L8FBObdn-nhGYNdqnLz+CwwCgGPR4iRQ@mail.gmail.com |
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| Lists: | pgsql-general |
On Thu, Sep 8, 2011 at 7:06 AM, Chris Redekop <chris(at)replicon(dot)com> wrote:
> Is there anything available to get the last time a transaction
> occurred?....like say "pg_last_xact_timestamp"?
No.
> In order to accurately
> calculate how far behind my slave is I need to do something like
> master::pg_last_xact_timestamp() -
> slave::pg_last_xact_replay_timestamp()....currently I'm using now() instead
> of the pg_last_xact_timestamp() call, but then when the master is not busy
> the slave appears to lag behind. I'm considering writing a C module to get
> the last modified file time of the xlog, but I'm hoping there is a better
> alternative that I haven't found yet....
Your complaint makes sense. I'll implement something like
pg_last_xact_timestamp() for 9.2. But unfortunately there is
no way to know such a timestamp on the master, in 9.1..
Regards,
--
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center
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