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Moving pgstat.stat and pgstat.tmp

From: Erik Jones <erik(at)myemma(dot)com>
To: Postgres General <pgsql-general(at)postgresql(dot)org>
Subject: Moving pgstat.stat and pgstat.tmp
Date: 2007-12-03 21:37:37
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-general
Hi, I'm currently doctoring a situation wherein we've got table  
inheritance scheme that over the years that has ballooned like only  
in your nightmares (think well over 100K tables + indexes on those).   
The obvious solution is to re-design the schema with a better  
partitioning scheme in mind (see another msg from me later today on  
that) but that's a big project that's just getting underway and an  
immediate concern is the I/O on out data partition due in large part  
to the stats file(s) getting hammered.  We can verify this by looking  
at our write volume 45+ Mbits/s and watching it drop to well below 10  
on average when we disable stat_row_level as well as watching the  
insane amounts of writes to pgstat.tmp when running the rwsnoop  
dtrace script.

So, for the interim we're looking to move where the stats files are  
written to.  I've made the changes to the file paths for pgstat.stat  
and pgstat.tmp in src/backend/postmaster/pgstat.c, recompiled and  
verified that everything seems to be working ok on our test machine.   
However, seeing as how I'm not all that familiar with the code base,  
I'm asking here:  is that all I need to do?  Is there anything I've  

Erik Jones

Software Developer | Emma®
800.595.4401 or 615.292.5888
615.292.0777 (fax)

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