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Fix from Jan for vacuum statistics loss.

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This commit is contained in:
Bruce Momjian 1998-10-23 16:49:24 +00:00
parent 3037aace73
commit 54fd5f6cc4
1 changed files with 24 additions and 4 deletions
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28
src/backend/commands/vacuum.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.89 1998/10/23 01:02:08 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.90 1998/10/23 16:49:24 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -1792,8 +1792,16 @@ vc_updstats(Oid relid, int num_pages, int num_tuples, bool hasindex, VRelStats *
/* overwrite the existing statistics in the tuple */
if (VacAttrStatsEqValid(stats))
{
Buffer abuffer;
/*
* We manipulate the heap tuple in the
* buffer, so we fetch it to get the
* buffer number
*/
atup = heap_fetch(ad, SnapshotNow, &atup->t_ctid, &abuffer);
vc_setpagelock(ad, ItemPointerGetBlockNumber(&atup->t_ctid));
attp = (Form_pg_attribute) GETSTRUCT(atup);
if (stats->nonnull_cnt + stats->null_cnt == 0 ||
(stats->null_cnt <= 1 && stats->best_cnt == 1))
@ -1822,7 +1830,14 @@ vc_updstats(Oid relid, int num_pages, int num_tuples, bool hasindex, VRelStats *
if (selratio > 1.0)
selratio = 1.0;
attp->attdisbursion = selratio;
WriteNoReleaseBuffer(ItemPointerGetBlockNumber(&atup->t_ctid));
/*
* Invalidate the cache for the tuple
* and write the buffer
*/
RelationInvalidateHeapTuple(ad, atup);
WriteNoReleaseBuffer(abuffer);
ReleaseBuffer(abuffer);
/* DO PG_STATISTIC INSERTS */
@ -1875,10 +1890,15 @@ vc_updstats(Oid relid, int num_pages, int num_tuples, bool hasindex, VRelStats *
heap_close(sd);
}
/*
* Invalidate the cached pg_class tuple and
* write the buffer
*/
RelationInvalidateHeapTuple(rd, rtup);
/* XXX -- after write, should invalidate relcache in other backends */
WriteBuffer(ItemPointerGetBlockNumber(&rtup->t_ctid));
WriteNoReleaseBuffer(buffer);
ReleaseBuffer(buffer);
heap_close(rd);
}