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Teach ANALYZE to distinguish dead and in-doubt tuples, which it formerly

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classed all as "dead"; also get it to count DEAD item pointers as dead rows,
instead of ignoring them as before.  Also improve matters so that tuples
previously inserted or deleted by our own transaction are handled nicely:
the stats collector's live-tuple and dead-tuple counts will end up correct
after our transaction ends, regardless of whether we end in commit or abort.

While there's more work that could be done to improve the counting of in-doubt
tuples in both VACUUM and ANALYZE, this commit is enough to alleviate some
known bad behaviors in 8.3; and the other stuff that's been discussed seems
like research projects anyway.

Pavan Deolasee and Tom Lane
This commit is contained in:
Tom Lane
2008-04-03 16:27:25 +00:00
parent f1e0d5a8ca
commit 51e1445f10
3 changed files with 143 additions and 37 deletions
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4
src/include/pgstat.h
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@ -5,7 +5,7 @@
*
* Copyright (c) 2001-2008, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/include/pgstat.h,v 1.73 2008/03/24 18:22:36 tgl Exp $
* $PostgreSQL: pgsql/src/include/pgstat.h,v 1.74 2008/04/03 16:27:25 tgl Exp $
* ----------
*/
#ifndef PGSTAT_H
@ -497,7 +497,7 @@ extern void pgstat_reset_counters(void);
extern void pgstat_report_autovac(Oid dboid);
extern void pgstat_report_vacuum(Oid tableoid, bool shared,
bool analyze, PgStat_Counter tuples);
extern void pgstat_report_analyze(Oid tableoid, bool shared,
extern void pgstat_report_analyze(Relation rel,
PgStat_Counter livetuples,
PgStat_Counter deadtuples);