Re: LWLocks by LockManager slowing large DB - Mailing list pgsql-performance

From Andres Freund
Subject Re: LWLocks by LockManager slowing large DB
Date
Msg-id 20210413204806.v4y5luxzaozmbafg@alap3.anarazel.de
Whole thread Raw
In response to RE: LWLocks by LockManager slowing large DB  (Paul Friedman <paul.friedman@streetlightdata.com>)
Responses Re: LWLocks by LockManager slowing large DB  (Tom Lane <tgl@sss.pgh.pa.us>)
RE: LWLocks by LockManager slowing large DB  (Paul Friedman <paul.friedman@streetlightdata.com>)
List pgsql-performance
Hi,

On 2021-04-13 11:47:06 -0700, Paul Friedman wrote:
> YES!!!  This completely alleviates the bottleneck and I'm able to run the
> queries full-throttle.  Thank you SO much for your help+insight.

Cool. And damn: I can't immediately think of a way to optimize this to
not require this kind of hack in the future.


> Interestingly, "lock pg_toast.pg_toast_2233612264 in ACCESS SHARE MODE;"
> which should do the same thing returns an error " ERROR:
> "pg_toast_2233612264" is not a table or view"
>
> Sounds like I should file this as a requested improvement?

The ability to lock a toast table? Yea, it might be worth doing that. I
seem to recall this being discussed not too long ago...

Greetings,

Andres Freund



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