diff --git a/backend/conf/config.yml b/backend/conf/config.yml
index a5e0b23b..60d2bd41 100644
--- a/backend/conf/config.yml
+++ b/backend/conf/config.yml
@@ -15,7 +15,7 @@ redis:
 log:
   level: info
   path: "/var/logs/crawlab"
-  isDeletePeriodically: "Y"
+  isDeletePeriodically: "N"
   deleteFrequency: "@hourly"
 server:
   host: 0.0.0.0