diff -r 356dcb1d455c -r aab3ed7d93fe dbd/postgresql/connection.c
--- a/dbd/postgresql/connection.c	Mon Dec 20 23:03:00 2010 +0000
+++ b/dbd/postgresql/connection.c	Fri Dec 24 00:34:04 2010 +0000
@@ -109,10 +109,12 @@
     int err = 0;
 
     if (conn->postgresql) {
-	if (on)
-	    err = rollback(conn);
-	else
-	    err = begin(conn);
+	if (on != conn->autocommit) {
+	    if (on)
+		err = rollback(conn);
+	    else
+		err = begin(conn);
+	}
 
 	conn->autocommit = on;	
     }