From: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: Mon, 24 Oct 2016 12:27:24 +0000 (-0300)
Subject: Preserve commit timestamps across clean restart
X-Git-Tag: REL9_5_5~3
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=7a2fa5774a52bf7469f622e3ed4d6317c1d5a64e;p=postgresql

Preserve commit timestamps across clean restart

An oversight in setting the boundaries of known commit timestamps during
startup caused old commit timestamps to become inaccessible after a
server restart.

Author and reporter: Julien Rouhaud
Review, test code: Craig Ringer
---

diff --git a/src/backend/access/transam/commit_ts.c b/src/backend/access/transam/commit_ts.c
index a284894862..38dba8cef4 100644
--- a/src/backend/access/transam/commit_ts.c
+++ b/src/backend/access/transam/commit_ts.c
@@ -842,6 +842,8 @@ SetCommitTsLimit(TransactionId oldestXact, TransactionId newestXact)
 	else
 	{
 		Assert(ShmemVariableCache->newestCommitTsXid == InvalidTransactionId);
+		ShmemVariableCache->oldestCommitTsXid = oldestXact;
+		ShmemVariableCache->newestCommitTsXid = newestXact;
 	}
 	LWLockRelease(CommitTsLock);
 }