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Derive latestRemovedXid for btree deletes by reading heap pages. The

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WAL record for btree delete contains a list of tids, even when backup
blocks are present. We follow the tids to their heap tuples, taking
care to follow LP_REDIRECT tuples. We ignore LP_DEAD tuples on the
understanding that they will always have xmin/xmax earlier than any
LP_NORMAL tuples referred to by killed index tuples. Iff all tuples
are LP_DEAD we return InvalidTransactionId. The heap relfilenode is
added to the WAL record, requiring API changes to pass down the heap
Relation. XLOG_PAGE_MAGIC updated.
This commit is contained in:
Simon Riggs
2010-03-28 09:27:02 +00:00
parent 59292f28ca
commit a760893dbd
6 changed files with 254 additions and 71 deletions
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4
src/include/access/xlog_internal.h
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@@ -11,7 +11,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/xlog_internal.h,v 1.30 2010/03/19 17:42:10 sriggs Exp $
* $PostgreSQL: pgsql/src/include/access/xlog_internal.h,v 1.31 2010/03/28 09:27:02 sriggs Exp $
*/
#ifndef XLOG_INTERNAL_H
#define XLOG_INTERNAL_H
@@ -71,7 +71,7 @@ typedef struct XLogContRecord
/*
* Each page of XLOG file has a header like this:
*/
#define XLOG_PAGE_MAGIC 0x9002 /* can be used as WAL version indicator */
#define XLOG_PAGE_MAGIC 0x9003 /* can be used as WAL version indicator */
typedef struct XLogPageHeaderData
{