Introduce wal_level GUC to explicitly control if information needed for

archival or hot standby should be WAL-logged, instead of deducing that from
other options like archive_mode. This replaces recovery_connections GUC in
the primary, where it now has no effect, but it's still used in the standby
to enable/disable hot standby.

Remove the WAL-logging of "unlogged operations", like creating an index
without WAL-logging and fsyncing it at the end. Instead, we keep a copy of
the wal_mode setting and the settings that affect how much shared memory a
hot standby server needs to track master transactions (max_connections,
max_prepared_xacts, max_locks_per_xact) in pg_control. Whenever the settings
change, at server restart, write a WAL record noting the new settings and
update pg_control. This allows us to notice the change in those settings in
the standby at the right moment, they used to be included in checkpoint
records, but that meant that a changed value was not reflected in the
standby until the first checkpoint after the change.

Bump PG_CONTROL_VERSION and XLOG_PAGE_MAGIC. Whack XLOG_PAGE_MAGIC back to
the sequence it used to follow, before hot standby and subsequent patches
changed it to 0x9003.

1 files changed, 1 insertions, 8 deletions

diff --git a/src/backend/commands/copy.c b/src/backend/commands/copy.c
index 9031cd1fa5..4e95a8315c 100644
--- a/src/backend/commands/copy.c
+++ b/src/backend/commands/copy.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/commands/copy.c,v 1.326 2010/02/26 02:00:38 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/commands/copy.c,v 1.327 2010/04/28 16:10:41 heikki Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -2223,14 +2223,7 @@ CopyFrom(CopyState cstate)
 	 * indexes since those use WAL anyway)
 	 */
 	if (hi_options & HEAP_INSERT_SKIP_WAL)
-	{
-		char		reason[NAMEDATALEN + 30];
-
-		snprintf(reason, sizeof(reason), "COPY FROM on \"%s\"",
-				 RelationGetRelationName(cstate->rel));
-		XLogReportUnloggedStatement(reason);
 		heap_sync(cstate->rel);
-	}
 }