git.postgresql.org Git - postgresql.git/commitdiff

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c

index 617895c147ae6054579e73681070aec3a13e1d8e..fd7f20546680a93e909a0df1414f30884bfa211e 100644 (file)

--- a/src/backend/access/transam/xlog.c

+++ b/src/backend/access/transam/xlog.c

* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group

* Portions Copyright (c) 1994, Regents of the University of California

*

- * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.432 2010年08月26日 19:23:41 alvherre Exp $

+ * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.433 2010年08月30日 14:22:05 sriggs Exp $

*

*-------------------------------------------------------------------------

*/

}

/*

- * Currently, there is no need to truncate pg_subtrans during recovery. If

- * we did do that, we will need to have called StartupSUBTRANS() already

- * and then TruncateSUBTRANS() would go here.

+ * Truncate pg_subtrans if possible. We can throw away all data before

+ * the oldest XMIN of any running transaction. No future transaction will

+ * attempt to reference any pg_subtrans entry older than that (see Asserts

+ * in subtrans.c). When hot standby is disabled, though, we mustn't do

+ * this because StartupSUBTRANS hasn't been called yet.

*/

+ if (EnableHotStandby)

+ TruncateSUBTRANS(GetOldestXmin(true, false));

/* All real work is done, but log before releasing lock. */

if (log_checkpoints)