diff --git a/cpp/CHANGELOG.md b/cpp/CHANGELOG.md
index 0520eaf331..ca4e466cf9 100644
--- a/cpp/CHANGELOG.md
+++ b/cpp/CHANGELOG.md
@@ -20,7 +20,7 @@ Please mark all change in change log and use the ticket from JIRA.
 - MS-22 - Enhancement for MemVector size control 
 - MS-92 - Unify behavior of debug and release build
 - MS-98 - Install all unit test to installation directory
-
+- MS-115 - Change is_startup of metric_config switch from true to on
 ## New Feature
 
 - MS-57 - Implement index load/search pipeline
diff --git a/cpp/conf/server_config.yaml b/cpp/conf/server_config.yaml
index 27a96960cf..1c26c0aa52 100644
--- a/cpp/conf/server_config.yaml
+++ b/cpp/conf/server_config.yaml
@@ -12,7 +12,7 @@ db_config:
   archive_days_threshold: 30       # files older than x days will be archived, unit: day
 
 metric_config:
-  is_startup: true      # if monitoring start: on, off
+  is_startup: off      # if monitoring start: on, off
   collector: prometheus # metrics collector: prometheus
   prometheus_config:    # following are prometheus configure
     collect_type: pull  # prometheus collect data method
@@ -20,6 +20,7 @@ metric_config:
     push_gateway_ip_address: 127.0.0.1 # push method configure: push gateway ip address
     push_gateway_port: 9091            # push method configure: push gateway port
 
+
 license_config:         # license configure
   license_path: "/tmp/system.license" # license file path
 
diff --git a/cpp/src/metrics/PrometheusMetrics.cpp b/cpp/src/metrics/PrometheusMetrics.cpp
index 07e1d2ee71..d0d50800ad 100644
--- a/cpp/src/metrics/PrometheusMetrics.cpp
+++ b/cpp/src/metrics/PrometheusMetrics.cpp
@@ -17,7 +17,8 @@ ServerError
 PrometheusMetrics::Init() {
     try {
         ConfigNode &configNode = ServerConfig::GetInstance().GetConfig(CONFIG_METRIC);
-        startup_ = configNode.GetValue(CONFIG_METRIC_IS_STARTUP) == "true" ? true : false;
+        startup_ = configNode.GetValue(CONFIG_METRIC_IS_STARTUP) == "on";
+        if(!startup_) return SERVER_SUCCESS;
         // Following should be read from config file.
         const std::string bind_address = configNode.GetChild(CONFIG_PROMETHEUS).GetValue(CONFIG_METRIC_PROMETHEUS_PORT);
         const std::string uri = std::string("/metrics");
diff --git a/cpp/unittest/metrics/metrics_test.cpp b/cpp/unittest/metrics/metrics_test.cpp
index 82e1d99b93..72596dc79e 100644
--- a/cpp/unittest/metrics/metrics_test.cpp
+++ b/cpp/unittest/metrics/metrics_test.cpp
@@ -33,7 +33,7 @@ TEST_F(DBTest, Metric_Tes) {
     server::Metrics::GetInstance().Init();
 
 //    server::PrometheusMetrics::GetInstance().exposer_ptr()->RegisterCollectable(server::PrometheusMetrics::GetInstance().registry_ptr());
-    zilliz::milvus::cache::CpuCacheMgr::GetInstance()->SetCapacity(2UL*1024*1024*1024);
+    zilliz::milvus::cache::CpuCacheMgr::GetInstance()->SetCapacity(1UL*1024*1024*1024);
     std::cout<<zilliz::milvus::cache::CpuCacheMgr::GetInstance()->CacheCapacity()<<std::endl;
 
     static const std::string group_name = "test_group";
@@ -102,7 +102,7 @@ TEST_F(DBTest, Metric_Tes) {
         }
     });
 
-    int loop = 10;
+    int loop = 10000;
 
     for (auto i=0; i<loop; ++i) {
         if (i==40) {