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Re: keeping a timestamp of the last stats reset (for a db, table and function)

From: Jim Nasby <jim(at)nasby(dot)net>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Tomas Vondra <tv(at)fuzzy(dot)cz>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: keeping a timestamp of the last stats reset (for a db, table and function)
Date: 2010-12-19 18:13:49
Message-ID: 1F8EECEB-9C01-449A-8BBF-BFF6D553B74F@nasby.net (view raw or flat)
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Lists: pgsql-hackers
On Dec 18, 2010, at 8:51 PM, Tom Lane wrote:
> Tomas Vondra <tv(at)fuzzy(dot)cz> writes:
>> I've done several small changes to the patch, namely
> 
>> - added docs for the functions (in SGML)
>> - added the same thing for background writer
> 
>> So I think now it's 'complete' and I'll add it to the commit fest in a
>> few minutes.
> 
> Please split this into separate patches for database-level and
> table-level tracking, because I think it's highly likely that the latter
> will get rejected.  We have had multiple complaints already about the
> size of the stats file for databases with many tables.  I don't believe
> that it's worth bloating the per-table entries even further with this
> information.  Tracking reset time it per-database doesn't seem like a
> problem though.

Is there a reason this info needs to be tracked in the stats table? I know it's the most obvious place, but since we're worried about the size of it, what about tracking it in pg_class or somewhere else?
--
Jim C. Nasby, Database Architect                   jim(at)nasby(dot)net
512.569.9461 (cell)                         http://jim.nasby.net



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