Added GUC configuration options to control access statistics.

Jan

src/backend/utils/misc/postgresql.conf.sample

@@ -149,6 +149,16 @@
 #endif
 
 
+#
+#	Access statistics collection
+#
+#collect_startcollector = true
+#collect_resetonpmstart = true
+#collect_querystring = false
+#collect_tuplelevel = false
+#collect_blocklevel = false
+
+
 #
 #	Lock Tracing
 #