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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/hash/hashsearch.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/hash/hashsearch.c,v 1.49 2007/05/03 16:45:58 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/hash/hashsearch.c,v 1.50 2007/05/27 03:50:38 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -127,7 +127,7 @@ _hash_first(IndexScanDesc scan, ScanDirection dir)
ItemPointer current;
OffsetNumber offnum;
pgstat_count_index_scan(&scan->xs_pgstat_info);
pgstat_count_index_scan(rel);
current = &(so->hashso_curpos);
ItemPointerSetInvalid(current);