diff --git a/src/observer/omt/ob_tenant_config_mgr.cpp b/src/observer/omt/ob_tenant_config_mgr.cpp
index dfa757211e..d9c3d30d33 100644
--- a/src/observer/omt/ob_tenant_config_mgr.cpp
+++ b/src/observer/omt/ob_tenant_config_mgr.cpp
@@ -283,7 +283,7 @@ int ObTenantConfigMgr::add_tenant_config(uint64_t tenant_id)
     }
   } else {
     ObTenantConfig *new_config = nullptr;
-    new_config = OB_NEW(ObTenantConfig, ObModIds::OMT, tenant_id);
+    new_config = OB_NEW(ObTenantConfig, "TenantConfig", tenant_id);
     if (OB_NOT_NULL(new_config)) {
       if(OB_FAIL(new_config->init(this))) {
         LOG_WARN("new tenant config init failed", K(ret));
diff --git a/src/sql/ob_sql_task.cpp b/src/sql/ob_sql_task.cpp
index 4ef565391b..1d96ec4c22 100644
--- a/src/sql/ob_sql_task.cpp
+++ b/src/sql/ob_sql_task.cpp
@@ -12,7 +12,6 @@
 
 #define USING_LOG_PREFIX SQL
 
-#include "lib/queue/ob_fixed_queue.h"
 #include "ob_sql_task.h"
 #include "ob_sql.h"
 
@@ -97,63 +96,22 @@ int ObSqlTask::init(const int msg_type, const ObReqTimestamp &req_ts, const char
 
 int ObSqlTaskFactory::init()
 {
-  int ret = OB_SUCCESS;
-  int64_t fixed_num = 0;
-  if (!lib::is_mini_mode()) {
-    fixed_num = NORMAL_FIXED_TASK_NUM;
-  } else {
-    fixed_num = MINI_FIXED_TASK_NUM;
-  }
-  if (OB_FAIL(fixed_queue_.init(fixed_num))) {
-    SQL_LOG(WARN, "init fixed queue failed", K(ret), K(fixed_num));
-  } else {
-    for (int64_t i = 0; OB_SUCC(ret) && i < fixed_num; i++) {
-      ObSqlTask *task = alloc_(common::OB_SERVER_TENANT_ID);
-      if (OB_ISNULL(task)) {
-        ret = OB_ALLOCATE_MEMORY_FAILED;
-      } else {
-        task->set_fixed_alloc();
-        if (OB_FAIL(fixed_queue_.push(task))) {
-          free_(task);
-          task = NULL;
-        }
-      }
-    }
-  }
-  return ret;
+  // do nothing
+  return OB_SUCCESS;
 }
 
 void ObSqlTaskFactory::destroy()
 {
-  ObSqlTask *task = NULL;
-  while (OB_SUCCESS == fixed_queue_.pop(task)) {
-    free_(task);
-    task = NULL;
-  }
 }
 
 ObSqlTask *ObSqlTaskFactory::alloc(const uint64_t tenant_id)
 {
-  int ret = OB_SUCCESS;
-  ObSqlTask *task = NULL;
-  if (OB_FAIL(fixed_queue_.pop(task))) {
-    task = alloc_(tenant_id);
-  }
-  return task;
+  return alloc_(tenant_id);
 }
 
 void ObSqlTaskFactory::free(ObSqlTask *task)
 {
-  int ret = OB_SUCCESS;
-  if (NULL != task) {
-    if (task->is_fixed_alloc()) {
-      if (OB_FAIL(fixed_queue_.push(task))) {
-        SQL_LOG(WARN, "free sql task failed", K(ret));
-      }
-    } else {
-      free_(task);
-    }
-  }
+  free_(task);
 }
 
 ObSqlTaskFactory &ObSqlTaskFactory::get_instance()
diff --git a/src/sql/ob_sql_task.h b/src/sql/ob_sql_task.h
index bca663993d..9c4720ef84 100644
--- a/src/sql/ob_sql_task.h
+++ b/src/sql/ob_sql_task.h
@@ -40,7 +40,7 @@ class ObSqlTask : public observer::ObSrvTask
 {
   friend class ObSqlTaskFactory;
 public:
-  ObSqlTask() : msg_type_(0), size_(0), is_fixed_alloc_(false), handler_() {}
+  ObSqlTask() : msg_type_(0), size_(0), handler_() {}
   ~ObSqlTask() {}
   int init(const int msg_type, const ObReqTimestamp &req_ts, const char *buf, const int64_t size, ObSql *sql_engine);
   void reset();
@@ -52,14 +52,10 @@ public:
   TO_STRING_KV(KP(this), K_(msg_type));
 public:
   static const int64_t MAX_SQL_TASK_SIZE = 16 * 1024 - 128;
-private:
-  void set_fixed_alloc() { is_fixed_alloc_ = true; }
-  bool is_fixed_alloc() const { return is_fixed_alloc_; }
 private:
   int msg_type_;
   char buf_[MAX_SQL_TASK_SIZE];
   int64_t size_;
-  bool is_fixed_alloc_;
   ObSqlTaskHandler handler_;
   ObReqTimestamp req_ts_;
 };
@@ -78,11 +74,6 @@ public:
 private:
   ObSqlTask *alloc_(const uint64_t tenant_id);
   void free_(ObSqlTask *task);
-private:
-  static const int64_t NORMAL_FIXED_TASK_NUM = 4096;
-  static const int64_t MINI_FIXED_TASK_NUM = 128;
-private:
-  ObFixedQueue<ObSqlTask> fixed_queue_;
 };
 
 } // transaction