diff --git a/scripts-available/CDB_TableMetadata.sql b/scripts-available/CDB_TableMetadata.sql
index d91f798..7eb22b7 100644
--- a/scripts-available/CDB_TableMetadata.sql
+++ b/scripts-available/CDB_TableMetadata.sql
@@ -64,6 +64,10 @@ DECLARE
   tabname TEXT;
   rec RECORD;
   found BOOL;
+  function_start timestamptz;
+  function_end timestamptz;
+  function_duration float;
+  log_error_verbosity text;
 BEGIN
 
   IF TG_OP = 'UPDATE' or TG_OP = 'INSERT' THEN
@@ -72,6 +76,8 @@ BEGIN
     tabname = OLD.tabname;
   END IF;
 
+  EXECUTE 'SELECT clock_timestamp()' INTO function_start;
+ 
   -- Notify table data update
   -- This needs a little bit more of research regarding security issues
   -- see https://github.com/CartoDB/cartodb/pull/241
@@ -105,7 +111,15 @@ BEGIN
     EXIT;
   END LOOP;
   IF NOT found THEN RAISE WARNING 'Missing cdb_invalidate_varnish()'; END IF;
-
+  
+  EXECUTE 'SELECT clock_timestamp()' INTO function_end;
+  SELECT extract(epoch from (function_end - function_start)) INTO function_duration;
+  
+  EXECUTE 'SELECT setting FROM pg_settings where name=''log_error_verbosity''' INTO log_error_verbosity;
+  SET log_error_verbosity=TERSE;
+  RAISE LOG 'invalidation_duration: %', function_duration::text;
+  EXECUTE 'SET log_error_verbosity= ' || log_error_verbosity;
+  
   RETURN NULL;
 END;
 $$