diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1245154ba25d1dd19253370d59c320d798fdb759..ee7aa1c3e254e9458fe9d7c8fd6e10d3a63e533b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,14 +18,15 @@ Please mark all change in change log and use the issue from GitHub
 ## Bug
 -   \#2378 Duplicate data after server restart
 -   \#2399 The nlist set by the user may not take effect
+-   \#2403 MySQL max_idle_time is 10 by default
 
 ## Feature
 -   \#2363 Update branch version
--   \#2381 Upgrade to faiss_1.6.3
 
 ## Improvement
 -   \#2307 Disable index SPTAG by default
 -   \#2370 Clean compile warning
+-   \#2381 Upgrade FAISS to 1.6.3
 
 ## Task
 
diff --git a/core/src/db/meta/MySQLConnectionPool.h b/core/src/db/meta/MySQLConnectionPool.h
index bab0ddabcd144bc056bdd7579388d0d01855287c..523ffe00eb0ed5efb956d2d53fe300eb59862acc 100644
--- a/core/src/db/meta/MySQLConnectionPool.h
+++ b/core/src/db/meta/MySQLConnectionPool.h
@@ -73,7 +73,7 @@ class MySQLConnectionPool : public mysqlpp::ConnectionPool {
 
     int max_pool_size_;
 
-    unsigned int max_idle_time_ = 0;  // 10 seconds
+    unsigned int max_idle_time_ = 10;  // 10 seconds
 };
 
 }  // namespace meta