Re: feature: dynamic DB cache resizing

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От Bruce Momjian
Тема Re: feature: dynamic DB cache resizing
Дата
Msg-id 200512052156.jB5LuAA25103@candle.pha.pa.us
обсуждение исходный текст
Ответ на feature: dynamic DB cache resizing  ("Ed L." <pgsql@bluepolka.net>)
Ответы Re: feature: dynamic DB cache resizing  (Tom Lane <tgl@sss.pgh.pa.us>)
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Ed L. wrote:
> We have ~75 pgsql clusters running in environments where downtime
> comes at a premium cost.  We often run multiple clusters on a
> single box, and find it necessary to adjust the size of the
> static DB cache as we add or move clusters.  Unfortunately, that
> means some downtime.  It would be extremely useful in minimizing
> downtime to be able to dynamically resize the DB cache without
> having to restart the cluster.  How hard would that be?

We can't think of how to do because it is all shared memory shared by
ever forked process --- does that help explain its complexity?
;-)

--
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  pgman@candle.pha.pa.us               |  (610) 359-1001
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