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From: Fernando Nasser <fnasser(at)cygnus(dot)com>
To: pgsql-patches(at)postgresql(dot)org
Subject: ANALYZE command [REPOST]
Date: 2001-04-24 22:30:09
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-patches
[My apologies: I forgot to tell to which sources the patch applies, as required and, which is worse, I attached the wrong patch;  I have corrected it now.]

This patch is a follow-up to the split of the vacuum and analyze (done by Bruce Momjian last year).  I applies to today's CVS sources.

It adds a separate SQL extension command ANALYZE that will only perform the analyze part and thus only use shared locks.

I will submit the doc and test changes in a separate patch, if you decide that we are really going ahead with the ANALYZE command.

This version still does not update pg_class.  Those statistics are still tied in the vacuum part (num. of pages, tuples and indication if the relation has an index).  The patch allows for analyze_rel() to work differently if run as part of a VACUUM or as an standalone ANALYZE, so the missing bits can be added without changes to the current
behavior of VACUUM ANALYZE.

Possible future improvements:

1) Add the pg_class update to ANALYZE;

2) Add a VERBOSE option that prints information to gives the DBA a hint if it is worth of running VACUUM or not. 


Fernando Nasser
Red Hat Inc.              E-Mail:  fnasser(at)redhat(dot)com

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