diff --git a/src/share/cache/ob_kv_storecache.cpp b/src/share/cache/ob_kv_storecache.cpp
index 723d79e483..a615da50f7 100644
--- a/src/share/cache/ob_kv_storecache.cpp
+++ b/src/share/cache/ob_kv_storecache.cpp
@@ -231,7 +231,10 @@ int ObKVGlobalCache::init(
     cache_num_ = 0;
     stopped_ = false;
     mem_limit_getter_ = mem_limit_getter;
-    map_once_clean_num_ = min(MAX_MAP_ONCE_CLEAN_NUM, bucket_num / MAP_ONCE_CLEAN_RATIO);
+    map_once_clean_num_ = bucket_num / MAP_ONCE_CLEAN_RATIO;
+    if (map_once_clean_num_ > MAX_MAP_ONCE_CLEAN_NUM) {
+      map_once_clean_num_ = MAX(MAX_MAP_ONCE_CLEAN_NUM, map_once_clean_num_/EXPAND_MAP_ONCE_CLEAN_RATIO);
+    }
     map_once_replace_num_ = min(MAX_MAP_ONCE_REPLACE_NUM, bucket_num / MAP_ONCE_REPLACE_RATIO);
     inited_ = true;
 #ifdef ENABLE_DEBUG_LOG
diff --git a/src/share/cache/ob_kv_storecache.h b/src/share/cache/ob_kv_storecache.h
index c6e6990459..d2a83989bc 100644
--- a/src/share/cache/ob_kv_storecache.h
+++ b/src/share/cache/ob_kv_storecache.h
@@ -239,6 +239,7 @@ private:
   static const int64_t MAP_ONCE_CLEAN_RATIO = 50;  // 50 * 0.2 = 10s
   static const int64_t MAP_ONCE_REPLACE_RATIO = 100;  // 100 * 0.2 = 20s
   static const int64_t MAX_MAP_ONCE_CLEAN_NUM = 200000;  // 200K
+  static const int64_t EXPAND_MAP_ONCE_CLEAN_RATIO = 10;
   static const int64_t MAX_MAP_ONCE_REPLACE_NUM = 100000;  // 100K
   static const int64_t TIMER_SCHEDULE_INTERVAL_US = 800 * 1000;
   static const int64_t WORKING_SET_LIMIT_PERCENTAGE = 5;