On Mon, Jan 3, 2011 at 11:35, Greg Smith <greg(at)2ndquadrant(dot)com> wrote:
> Couple of doc suggestions:
> --- doc/src/sgml/high-availability.sgml
> + The number of query cancels and the reason for them can be viewed
> + the <structname>pg_stat_database_conflicts</> system view on the slave
> + server.
> For compleness sake, this should also mention the per-database summary, even
> though I'm not sure how valuable that view is. Also, "on a standby server"
> instead of "on the slave server" here. "slave" is mentioned once as a
> synonym in high-availability.sgml once, but that's it, and there can be more
> than one standby you want to pull these stats from.
Good point, changed and added.
> *** doc/src/sgml/monitoring.sgml
> ! number of rows returned, fetched, inserted, updated and deleted, and
> ! total number of queries cancelled due to conflict with recovery.
> This would be clearer if it said you're talking about standby recovery here,
> and possibly that this info is only available on the standby. I could see
> someone reading this and thinking it's possible for general database crash
> recovery to produce cancelled queries, instead of the way connections are
> actually blocked until that's done.
> ! <entry><structname>pg_stat_database_conflicts</>
> ! <entry>One row per database, showing database OID, database name and
> ! the number of queries that have been cancelled in this database due
> ! dropped tablespaces, lock timeouts, old snapshots, pinned buffers
> ! deadlocks.
> A clarification that you're talking about standby query cancellation here
> might be helpful too. I don't think that's necessary for all of the
> detailed pg_stat_get_* functions that regular users are less likely to care
> about, just these higher level ones.
Yeah, those both make sense - I've updated the docs and am running tests ATM.
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