From 4b113d9cdc8654e3f979497e057c7f9062bfa612 Mon Sep 17 00:00:00 2001
From: Bruce Momjian
Date: Fri, 5 Feb 2010 23:37:43 +0000
Subject: Document that archive_timeout will force new WAL files  even if a
 single checkpoint has happened, and recommend adjusting checkpoint_timeout to
 reduce the impact of this.

---
 src/backend/postmaster/bgwriter.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'src/backend/postmaster/bgwriter.c')

diff --git a/src/backend/postmaster/bgwriter.c b/src/backend/postmaster/bgwriter.c
index b51cceea74d..9a3956a5094 100644
--- a/src/backend/postmaster/bgwriter.c
+++ b/src/backend/postmaster/bgwriter.c
@@ -38,7 +38,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/postmaster/bgwriter.c,v 1.66 2010/01/15 09:19:02 heikki Exp $
+ *	  $PostgreSQL: pgsql/src/backend/postmaster/bgwriter.c,v 1.67 2010/02/05 23:37:43 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -543,7 +543,10 @@ BackgroundWriterMain(void)
 
 /*
  * CheckArchiveTimeout -- check for archive_timeout and switch xlog files
- *		if needed
+ *
+ * This will switch to a new WAL file and force an archive file write
+ * if any activity is recorded in the current WAL file, including just
+ * a single checkpoint record.
  */
 static void
 CheckArchiveTimeout(void)
-- 
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