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Tweak code so that pg_subtrans is never consulted for XIDs older than

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RecentXmin (== MyProc->xmin).  This ensures that it will be safe to
truncate pg_subtrans at RecentGlobalXmin, which should largely eliminate
any fear of bloat.  Along the way, eliminate SubTransXidsHaveCommonAncestor,
which isn't really needed and could not give a trustworthy result anyway
under the lookback restriction.
In an unrelated but nearby change, #ifdef out GetUndoRecPtr, which has
been dead code since 2001 and seems unlikely to ever be resurrected.
This commit is contained in:
Tom Lane
2004-08-22 02:41:58 +00:00
parent 37d937ea2c
commit f009c316ba
7 changed files with 40 additions and 56 deletions
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3
src/include/access/subtrans.h
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/subtrans.h,v 1.1 2004/07/01 00:51:38 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/subtrans.h,v 1.2 2004/08/22 02:41:58 tgl Exp $
*/
#ifndef SUBTRANS_H
#define SUBTRANS_H
@@ -20,7 +20,6 @@
extern void SubTransSetParent(TransactionId xid, TransactionId parent);
extern TransactionId SubTransGetParent(TransactionId xid);
extern TransactionId SubTransGetTopmostTransaction(TransactionId xid);
extern bool SubTransXidsHaveCommonAncestor(TransactionId xid1, TransactionId xid2);
extern int SUBTRANSShmemSize(void);
extern void SUBTRANSShmemInit(void);