Re: When do vacuumed pages/tuples become available for reuse?

From: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
To: rihad <rihad(at)mail(dot)ru>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-general General <pgsql-general(at)postgresql(dot)org>
Subject: Re: When do vacuumed pages/tuples become available for reuse?
Date: 2019-04-11 14:09:38
Message-ID: 20190411140938.GA22402@alvherre.pgsql
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On 2019-Apr-11, rihad wrote:

> Thanks! Our autovacuum_work_mem = 1GB, so this probably means any space
> would be available for reuse only at the end of the vacuum? Are there any
> downsides in decreasing it to, say, 64MB? I see only pluses )

Yes, each vacuum will take longer and will use much more I/O.

--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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