| From: | Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
|---|---|
| To: | Sreejith P <sreejith(at)lifetrenz(dot)com> |
| Cc: | "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Check replication lag |
| Date: | 2020-08-06 02:28:11 |
| Message-ID: | CA+hUKGK+gHZbZiHy30J_ft2Srywa8WZ314nrCG0e7UukxPeDeA@mail.gmail.com |
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| Lists: | pgsql-general |
On Thu, Aug 6, 2020 at 7:02 AM Sreejith P <sreejith(at)lifetrenz(dot)com> wrote:
> IN SYNC mode of replication what would be the impact on Master DB server in terms of over all performance ?
The pg_stat_replication columns write_lag, flush_lag and replay_lag
are designed tell you how long to expect commits to take for
synchronous standbys, based on recent history, if synchronous_commit
it set to remote_write, on or remote_apply respectively. Those times
tell you about commit latency, which limits sequential commit rate for
each session.
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