Re: query performance

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Brian Cox <brian(dot)cox(at)ca(dot)com>
Cc: "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>
Subject: Re: query performance
Date: 2008-04-25 00:34:53
Message-ID: 11185.1209083693@sss.pgh.pa.us
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Brian Cox <brian(dot)cox(at)ca(dot)com> writes:
> Any hints as to where the FSM info is in this file?

At the very end ... you're looking for these messages:

ereport(elevel,
(errmsg("free space map contains %d pages in %d relations",
storedPages, numRels),
errdetail("A total of %.0f page slots are in use (including overhead).\n"
"%.0f page slots are required to track all free space.\n"
"Current limits are: %d page slots, %d relations, using %.0f kB.",
Min(needed, MaxFSMPages),
needed,
MaxFSMPages, MaxFSMRelations,
(double) FreeSpaceShmemSize() / 1024.0)));

if (numRels == MaxFSMRelations)
ereport(elevel,
(errmsg("max_fsm_relations(%d) equals the number of relations checked",
MaxFSMRelations),
errhint("You have at least %d relations. "
"Consider increasing the configuration parameter \"max_fsm_relations\".",
numRels)));
else if (needed > MaxFSMPages)
ereport(elevel,
(errmsg("number of page slots needed (%.0f) exceeds max_fsm_pages (%d)",
needed, MaxFSMPages),
errhint("Consider increasing the configuration parameter \"max_fsm_pages\" "
"to a value over %.0f.", needed)));

regards, tom lane

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