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Improve handling of prune/no-prune decisions by storing a page's oldest

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unpruned XMAX in its header.  At the cost of 4 bytes per page, this keeps us
from performing heap_page_prune when there's no chance of pruning anything.
Seems to be necessary per Heikki's preliminary performance testing.
This commit is contained in:
Tom Lane
2007-09-21 21:25:42 +00:00
parent 386a5d4268
commit cc59049daf
10 changed files with 92 additions and 59 deletions
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7
contrib/pageinspect/rawpage.c
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@ -8,7 +8,7 @@
* Copyright (c) 2007, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/contrib/pageinspect/rawpage.c,v 1.1 2007/05/17 19:11:24 momjian Exp $
* $PostgreSQL: pgsql/contrib/pageinspect/rawpage.c,v 1.2 2007/09/21 21:25:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -110,8 +110,8 @@ page_header(PG_FUNCTION_ARGS)
Datum result;
HeapTuple tuple;
Datum values[8];
bool nulls[8];
Datum values[9];
bool nulls[9];
PageHeader page;
XLogRecPtr lsn;
@ -152,6 +152,7 @@ page_header(PG_FUNCTION_ARGS)
values[5] = UInt16GetDatum(page->pd_special);
values[6] = UInt16GetDatum(PageGetPageSize(page));
values[7] = UInt16GetDatum(PageGetPageLayoutVersion(page));
values[8] = TransactionIdGetDatum(page->pd_prune_xid);
/* Build and return the tuple. */