diff --git a/src/plugins/monitor/src/monMain.c b/src/plugins/monitor/src/monMain.c
index 6e583fe0dfd809bac8c0aabf56e48bb33bd910ce..fea793fa860fd17ff30bcecae1436180bc6b34bf 100644
--- a/src/plugins/monitor/src/monMain.c
+++ b/src/plugins/monitor/src/monMain.c
@@ -34,7 +34,7 @@
 #define monTrace(...) { if (monDebugFlag & DEBUG_TRACE) { taosPrintLog("MON ", monDebugFlag, __VA_ARGS__); }}
 
 #define SQL_LENGTH     1030
-#define LOG_LEN_STR    100
+#define LOG_LEN_STR    512
 #define IP_LEN_STR     TSDB_EP_LEN
 #define CHECK_INTERVAL 1000