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Fix up pgstats counting of live and dead tuples to recognize that committed

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and aborted transactions have different effects; also teach it not to assume
that prepared transactions are always committed.

Along the way, simplify the pgstats API by tying counting directly to
Relations; I cannot detect any redeeming social value in having stats
pointers in HeapScanDesc and IndexScanDesc structures.  And fix a few
corner cases in which counts might be missed because the relation's
pgstat_info pointer hadn't been set.
This commit is contained in:
Tom Lane
2007-05-27 03:50:39 +00:00
parent cadb78330e
commit 77947c51c0
20 changed files with 805 additions and 417 deletions
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4
src/backend/access/index/genam.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/index/genam.c,v 1.61 2007/01/20 18:43:35 neilc Exp $
* $PostgreSQL: pgsql/src/backend/access/index/genam.c,v 1.62 2007/05/27 03:50:38 tgl Exp $
*
* NOTES
* many of the old access method routines have been turned into
@@ -96,8 +96,6 @@ RelationGetIndexScan(Relation indexRelation,
scan->xs_ctup.t_data = NULL;
scan->xs_cbuf = InvalidBuffer;
pgstat_initstats(&scan->xs_pgstat_info, indexRelation);
/*
* Let the AM fill in the key and any opaque data it wants.
*/