Re: Protect syscache from bloating with negative cache entries

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Craig Ringer <craig(at)2ndquadrant(dot)com>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Protect syscache from bloating with negative cache entries
Date: 2016-12-20 15:09:18
Message-ID: 30868.1482246558@sss.pgh.pa.us
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Craig Ringer <craig(at)2ndquadrant(dot)com> writes:
> On 20 December 2016 at 21:59, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>> We could implement this by having
>> some process, like the background writer,
>> SendProcSignal(PROCSIG_HOUSEKEEPING) to every process in the system
>> every 10 minutes or so.

> ... on a rolling basis.

I don't understand why we'd make that a system-wide behavior at all,
rather than expecting each process to manage its own cache.

regards, tom lane

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