X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=src%2Fpostgresql_default.conf;h=83a32c77b3fd7b1883c82de65cb1b60e1acbdc45;hb=bddede06dcc7a03bca49d4c3b003786ab301793c;hp=21a0cd581d08cddb99601bf47df140ce197c00ba;hpb=6a66234ad7998be96dd5d152a12c75fd6cd39c75;p=collectd.git

diff --git a/src/postgresql_default.conf b/src/postgresql_default.conf
index 21a0cd58..83a32c77 100644
--- a/src/postgresql_default.conf
+++ b/src/postgresql_default.conf
@@ -1,4 +1,9 @@
 # Pre-defined queries of collectd's postgresql plugin.
+#
+# Do not edit this file. If you want to change any of the query definitions,
+# overwrite them in collectd.conf instead.
+#
+# This file is distributed under the same terms as collectd itself.
 
 <Query backends>
 	Statement "SELECT count(*) AS count \
@@ -136,14 +141,14 @@
 </Query>
 
 <Query disk_io>
-	Statement "SELECT sum(heap_blks_read) AS heap_read, \
-			sum(heap_blks_hit) AS heap_hit, \
-			sum(idx_blks_read) AS idx_read, \
-			sum(idx_blks_hit) AS idx_hit, \
-			sum(toast_blks_read) AS toast_read, \
-			sum(toast_blks_hit) AS toast_hit, \
-			sum(tidx_blks_read) AS tidx_read, \
-			sum(tidx_blks_hit) AS tidx_hit \
+	Statement "SELECT coalesce(sum(heap_blks_read), 0) AS heap_read, \
+			coalesce(sum(heap_blks_hit), 0) AS heap_hit, \
+			coalesce(sum(idx_blks_read), 0) AS idx_read, \
+			coalesce(sum(idx_blks_hit), 0) AS idx_hit, \
+			coalesce(sum(toast_blks_read), 0) AS toast_read, \
+			coalesce(sum(toast_blks_hit), 0) AS toast_hit, \
+			coalesce(sum(tidx_blks_read), 0) AS tidx_read, \
+			coalesce(sum(tidx_blks_hit), 0) AS tidx_hit \
 		FROM pg_statio_user_tables;"
 
 	<Result>