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From: Ron Mayer <rm_pg@cheapcomplexdevices.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Subject: Re: Missed index opportunity for outer join?
Date: Tue, 06 Dec 2005 13:42:09 -0800
Message-ID: <439605B1.5070800@cheapcomplexdevices.com> (raw)
In-Reply-To: <16502.1133904299@sss.pgh.pa.us>
References: <Pine.LNX.4.58.0512051401090.21335@greenie.cheapcomplexdevices.com>
	<3267.1133822299@sss.pgh.pa.us>
	<Pine.LNX.4.58.0512051443130.21474@greenie.cheapcomplexdevices.com>
	<4678.1133888239@sss.pgh.pa.us>
	<4395F1F3.1000803@cheapcomplexdevices.com>
	<15962.1133901211@sss.pgh.pa.us>
	<4395FF61.6060301@cheapcomplexdevices.com>
	<16502.1133904299@sss.pgh.pa.us>

Tom Lane wrote:
> If you have background tasks doing ANALYZEs then this explanation seems
> plausible enough.  I'm willing to accept it anyway ...

Yup, there are such tasks.   I could dig through logs to try to confirm
or reject it; but I think it's reasonably likely that this happened.
Basically, data gets added to that table as it becomes ready from other
systems, and after each batch a vacuum analyze is run.



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