On 10/27/2015 07:44 AM, Andres Freund wrote:
>> Unlinking old pg_clog files is strictly an optimization.  If you were to
>> > comment out every unlink() call in slru.c, the only ill effect on CLOG is 
>> > the
>> > waste of disk space.  Is the same true of MultiXact?
> Well, multixacts are a lot larger than the other SLRUs, I think that
> makes some sort of difference.

And by "a lot larger" we're talking like 50X to 100X.  I regularly see
pg_multixact directories larger than 1GB.

Josh Berkus
PostgreSQL Experts Inc.

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