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To: Craig James <craig_james@emolecules.com>
cc: PGSQL Performance <pgsql-performance@postgresql.org>
Subject: Re: Is ANALYZE transactional? 
In-reply-to: <472FF7C5.2060402@emolecules.com> 
References: <1d219a6f0711051043x569b7f51r4cee3353e6ea9f10@mail.gmail.com>
	<472F781F.6080200@enterprisedb.com>
	<472FF7C5.2060402@emolecules.com>
Comments: In-reply-to Craig James <craig_james@emolecules.com>
	message dated "Mon, 05 Nov 2007 21:12:37 -0800"
Date: Tue, 06 Nov 2007 00:30:34 -0500
Message-ID: <8739.1194327034@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
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Craig James <craig_james@emolecules.com> writes:
> If I do:
>   begin;
>   update some_table set foo = newvalue where a_bunch_of_rows_are_changed;
>   analyze some_table;
>   rollback;

> does it roll back the statistics?  (I think the answer is yes, but I need to be sure.)

Yes --- ANALYZE doesn't do anything magic, just a plain UPDATE of those
rows.  (You could have easily tested this for yourself...)

			regards, tom lane