| From: | "Simon Riggs" <simon(at)2ndquadrant(dot)com> |
|---|---|
| To: | "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | "Heikki Linnakangas" <heikki(at)enterprisedb(dot)com>, "Bruce Momjian" <bruce(at)momjian(dot)us>, "PostgreSQL-development" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: XID wraparound and busy databases |
| Date: | 2007-08-16 12:44:05 |
| Message-ID: | 1187268245.4460.7.camel@ebony.site |
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| Lists: | pgsql-hackers |
On Wed, 2007-08-15 at 12:49 -0400, Tom Lane wrote:
> Heikki Linnakangas <heikki(at)enterprisedb(dot)com> writes:
> > Maybe we can do something to reduce the xid consumption? For example,
> > reuse xids for read-only queries.
>
> Hmm, that's an idea.
That would be a very useful idea for additional scalability and it does
sound like a good idea.
We kicked around the idea of reusing snapshots previously also, as a way
of reducing access to the ProcArray. That idea had some problems, but if
your workload was all read-only and we reused xids then everybody would
have an identical snapshot, so reusing it would make lots of sense.
--
Simon Riggs
EnterpriseDB http://www.enterprisedb.com
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