Re: Guideline To Resolve LWLock:SubtransControlLock

From: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
To: Fred Habash <fmhabash(at)gmail(dot)com>
Cc: pgsql-performance(at)lists(dot)postgresql(dot)org
Subject: Re: Guideline To Resolve LWLock:SubtransControlLock
Date: 2018-08-17 18:26:45
Message-ID: 20180817182645.nmfaw6w7qzqb2dau@alvherre.pgsql
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On 2018-Aug-17, Fred Habash wrote:

> Aurora Postgres 9.6.3

Oh, okay, I don't know this one. Did you contact Amazon support?

> So, no chance to recompile (AFAIK).
> Is there a design anti-pattern at the schema or data access level that we
> should look for and correct?

Maybe ...

> And as for the recompile, are you thinking 'NUM_SUBTRANS_BUFFERS'?

Yes, that's one option, but there's also TOTAL_MAX_CACHED_SUBXIDS.

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

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