diff --git a/src/storage/ddl/ob_complement_data_task.cpp b/src/storage/ddl/ob_complement_data_task.cpp
index 4df5deb67f..8422980c3a 100644
--- a/src/storage/ddl/ob_complement_data_task.cpp
+++ b/src/storage/ddl/ob_complement_data_task.cpp
@@ -1245,7 +1245,7 @@ int ObComplementMergeTask::add_build_hidden_table_sstable()
   } else if (OB_FAIL(param_->get_hidden_table_key(hidden_table_key))) {
     LOG_WARN("fail to get hidden table key", K(ret), K(hidden_table_key));
   } else if (OB_FAIL(context_->data_sstable_redo_writer_.end_ddl_redo_and_create_ddl_sstable(
-      ls_handle, context_->ddl_kv_mgr_handle_, hidden_table_key, param_->dest_table_id_, param_->execution_id_, param_->task_id_))) {
+      ls_handle, hidden_table_key, param_->dest_table_id_, param_->execution_id_, param_->task_id_))) {
     LOG_WARN("failed to end ddl redo", K(ret));
   }
   return ret;
diff --git a/src/storage/ddl/ob_ddl_merge_task.cpp b/src/storage/ddl/ob_ddl_merge_task.cpp
index 3630d2c532..a734dd85e8 100644
--- a/src/storage/ddl/ob_ddl_merge_task.cpp
+++ b/src/storage/ddl/ob_ddl_merge_task.cpp
@@ -312,7 +312,7 @@ int ObDDLTableMergeTask::init(const ObDDLTableMergeDagParam &ddl_dag_param)
 int ObDDLTableMergeTask::process()
 {
   int ret = OB_SUCCESS;
-  int64_t MAX_DDL_SSTABLE = ObTabletDDLKvMgr::MAX_DDL_KV_CNT_IN_STORAGE * 0.5;
+  int64_t MAX_DDL_SSTABLE = 128;
 #ifdef ERRSIM
   if (0 != GCONF.errsim_max_ddl_sstable_count) {
     MAX_DDL_SSTABLE = GCONF.errsim_max_ddl_sstable_count;
@@ -426,10 +426,6 @@ int ObDDLTableMergeTask::process()
         }
       } else {
         LOG_INFO("commit ddl sstable succ", K(ddl_param), K(merge_param_));
-        int tmp_ret = OB_SUCCESS;
-        if (OB_TMP_FAIL(ddl_kv_mgr_handle.get_obj()->unregister_from_tablet(merge_param_.start_scn_, ddl_kv_mgr_handle))) {
-          LOG_WARN("unregister ddl kv mgr from tablet failed", K(tmp_ret), K(merge_param_));
-        }
       }
     }
   }
diff --git a/src/storage/ddl/ob_ddl_redo_log_writer.cpp b/src/storage/ddl/ob_ddl_redo_log_writer.cpp
index 8de237d4ba..7ebdcce20b 100644
--- a/src/storage/ddl/ob_ddl_redo_log_writer.cpp
+++ b/src/storage/ddl/ob_ddl_redo_log_writer.cpp
@@ -689,27 +689,17 @@ int ObDDLRedoLogWriter::write_ddl_start_log(ObTabletHandle &tablet_handle,
     ret = OB_TASK_EXPIRED;
     LOG_INFO("receive a old execution id, don't do ddl start", K(ret), K(log));
   } else if (ddl_kv_mgr_handle.get_obj()->get_commit_scn_nolock(tablet_handle.get_obj()->get_tablet_meta()).is_valid_and_not_min()) {
-    // ddl commit log already written
-    if (ddl_kv_mgr_handle.get_obj()->get_start_scn().is_valid_and_not_min()) {
-      start_scn = ddl_kv_mgr_handle.get_obj()->get_start_scn();
-      if (OB_FAIL(ddl_kv_mgr_handle.get_obj()->set_execution_id_nolock(log.get_execution_id()))) {
-        LOG_WARN("failed to set execution id", K(ret));
-      }
-      LOG_INFO("already committed, use new execution id", K(ret), K(start_scn),
-          K(log.get_execution_id()), "tablet_meta", tablet_handle.get_obj()->get_tablet_meta());
-    } else {
-      // ddl kv mgr is freed when ddl merge task finished, this is a new one, so recover it
+    start_scn = ddl_kv_mgr_handle.get_obj()->get_start_scn();
+    if (!start_scn.is_valid_and_not_min()) {
       start_scn = tablet_handle.get_obj()->get_tablet_meta().ddl_start_scn_;
-      SCN commit_scn = tablet_handle.get_obj()->get_tablet_meta().ddl_commit_scn_;
-      if (OB_FAIL(ddl_kv_mgr_handle.get_obj()->ddl_recover_nolock(log.get_table_key(),
-                                                                  start_scn,
-                                                                  log.get_data_format_version(),
-                                                                  log.get_execution_id(),
-                                                                  commit_scn))) {
-        LOG_WARN("start ddl log failed", K(ret), K(start_scn), K(log));
-      }
-      LOG_INFO("already committed, recover to success status", K(ret), K(start_scn), K(commit_scn),
-          K(log.get_execution_id()), "tablet_meta", tablet_handle.get_obj()->get_tablet_meta());
+    }
+    if (!start_scn.is_valid_and_not_min()) {
+      ret = OB_ERR_UNEXPECTED;
+      LOG_WARN("start scn must be valid after commit", K(ret), K(start_scn));
+    } else if (OB_FAIL(ddl_kv_mgr_handle.get_obj()->set_execution_id_nolock(log.get_execution_id()))) {
+      LOG_WARN("failed to set execution id", K(ret));
+    } else {
+      LOG_INFO("already committed, use previous start scn", K(ret), K(tablet_handle.get_obj()->get_tablet_meta()));
     }
   } else if (OB_ISNULL(cb = op_alloc(ObDDLStartClogCb))) {
     ret = OB_ALLOCATE_MEMORY_FAILED;
@@ -1089,7 +1079,6 @@ int ObDDLSSTableRedoWriter::start_ddl_redo(const ObITable::TableKey &table_key,
 
 int ObDDLSSTableRedoWriter::end_ddl_redo_and_create_ddl_sstable(
     ObLSHandle &ls_handle,
-    ObDDLKvMgrHandle &ddl_kv_mgr_handle,
     const ObITable::TableKey &table_key,
     const uint64_t table_id,
     const int64_t execution_id,
@@ -1097,17 +1086,20 @@ int ObDDLSSTableRedoWriter::end_ddl_redo_and_create_ddl_sstable(
 {
   int ret = OB_SUCCESS;
   ObTabletHandle tablet_handle;
+  ObDDLKvMgrHandle ddl_kv_mgr_handle;
   const ObTabletID &tablet_id = table_key.tablet_id_;
   ObLS *ls = nullptr;
   ObLSID ls_id;
   SCN ddl_start_scn = get_start_scn();
   SCN commit_scn = SCN::min_scn();
-  if (OB_ISNULL(ls = ls_handle.get_ls()) || !ddl_kv_mgr_handle.is_valid() || OB_UNLIKELY(!table_key.is_valid())) {
+  if (OB_ISNULL(ls = ls_handle.get_ls()) || OB_UNLIKELY(!table_key.is_valid())) {
     ret = OB_INVALID_ARGUMENT;
-    LOG_WARN("invalid ls", K(ret), KP(ls), K(ddl_kv_mgr_handle), K(table_key));
+    LOG_WARN("invalid ls", K(ret), K(table_key));
   } else if (OB_FALSE_IT(ls_id = ls->get_ls_id())) {
   } else if (OB_FAIL(ObDDLUtil::ddl_get_tablet(ls_handle, tablet_id, tablet_handle))) {
     LOG_WARN("get tablet failed", K(ret));
+  } else if (OB_FAIL(tablet_handle.get_obj()->get_ddl_kv_mgr(ddl_kv_mgr_handle))) {
+    LOG_WARN("get ddl kv manager failed", K(ret), K(ls_id), K(tablet_id));
   } else if (OB_FALSE_IT(ddl_kv_mgr_handle.get_obj()->prepare_info_for_checksum_report(table_id, ddl_task_id))) {
   } else if (OB_FAIL(write_commit_log(tablet_handle, ddl_kv_mgr_handle, table_key, table_id, execution_id, ddl_task_id, commit_scn))) {
     if (OB_TASK_EXPIRED == ret) {
diff --git a/src/storage/ddl/ob_ddl_redo_log_writer.h b/src/storage/ddl/ob_ddl_redo_log_writer.h
index eb57afffe7..19e1383864 100644
--- a/src/storage/ddl/ob_ddl_redo_log_writer.h
+++ b/src/storage/ddl/ob_ddl_redo_log_writer.h
@@ -269,7 +269,6 @@ public:
                      const int64_t data_format_version,
                      ObDDLKvMgrHandle &ddl_kv_mgr_handle);
   int end_ddl_redo_and_create_ddl_sstable(ObLSHandle &ls_handle,
-                                          ObDDLKvMgrHandle &ddl_kv_mgr_handle,
                                           const ObITable::TableKey &table_key,
                                           const uint64_t table_id,
                                           const int64_t execution_id,
diff --git a/src/storage/ddl/ob_direct_insert_sstable_ctx.cpp b/src/storage/ddl/ob_direct_insert_sstable_ctx.cpp
index e24c942261..541d5b6490 100644
--- a/src/storage/ddl/ob_direct_insert_sstable_ctx.cpp
+++ b/src/storage/ddl/ob_direct_insert_sstable_ctx.cpp
@@ -864,7 +864,7 @@ int ObSSTableInsertTabletContext::create_sstable_with_clog(
   } else {
     DEBUG_SYNC(AFTER_REMOTE_WRITE_DDL_PREPARE_LOG);
     if (OB_FAIL(data_sstable_redo_writer_.end_ddl_redo_and_create_ddl_sstable(
-        ls_handle_, ddl_kv_mgr_handle_, table_key, table_id, build_param_.execution_id_, build_param_.ddl_task_id_))) {
+        ls_handle_, table_key, table_id, build_param_.execution_id_, build_param_.ddl_task_id_))) {
       LOG_WARN("fail create ddl sstable", K(ret), K(table_key));
     }
   }
diff --git a/src/storage/ddl/ob_tablet_ddl_kv_mgr.cpp b/src/storage/ddl/ob_tablet_ddl_kv_mgr.cpp
index 8ddb780298..4d5b191671 100644
--- a/src/storage/ddl/ob_tablet_ddl_kv_mgr.cpp
+++ b/src/storage/ddl/ob_tablet_ddl_kv_mgr.cpp
@@ -170,39 +170,6 @@ int ObTabletDDLKvMgr::ddl_start(ObTablet &tablet,
   return ret;
 }
 
-int ObTabletDDLKvMgr::ddl_recover_nolock(const ObITable::TableKey &table_key,
-                                         const SCN &start_scn,
-                                         const int64_t data_format_version,
-                                         const int64_t execution_id,
-                                         const SCN &commit_scn)
-{
-  int ret = OB_SUCCESS;
-  if (OB_UNLIKELY(!is_inited_)) {
-    ret = OB_NOT_INIT;
-    LOG_WARN("not init", K(ret), K(is_inited_));
-  } else if (OB_UNLIKELY(!table_key.is_valid() || !start_scn.is_valid_and_not_min() || execution_id < 0 || data_format_version < 0
-        || (commit_scn.is_valid_and_not_min() && commit_scn < start_scn))) {
-    ret = OB_INVALID_ARGUMENT;
-    LOG_WARN("invalid argument", K(ret), K(table_key), K(start_scn), K(execution_id), K(data_format_version), K(commit_scn));
-  } else if (table_key.get_tablet_id() != tablet_id_) {
-    ret = OB_ERR_SYS;
-    LOG_WARN("tablet id not same", K(ret), K(table_key), K(tablet_id_));
-  } else if (start_scn_.is_valid_and_not_min()) {
-    ret = OB_ERR_SYS;
-    LOG_WARN("start scn has set", K(ret), K(start_scn_));
-  } else {
-    table_key_ = table_key;
-    data_format_version_ = data_format_version;
-    execution_id_ = execution_id;
-    start_scn_ = start_scn;
-    max_freeze_scn_ = commit_scn;
-    commit_scn_ = commit_scn;
-    success_start_scn_ = start_scn;
-  }
-  FLOG_INFO("ddl recover finished", K(ret), K(*this));
-  return ret;
-}
-
 int ObTabletDDLKvMgr::ddl_commit(const SCN &start_scn,
                                  const SCN &commit_scn,
                                  const uint64_t table_id,
@@ -352,12 +319,6 @@ int ObTabletDDLKvMgr::wait_ddl_merge_success(const SCN &start_scn, const SCN &co
             "wait_elpased_s", (ObTimeUtility::fast_current_time() - wait_start_ts) / 1000000L);
       }
     }
-    if (OB_TASK_EXPIRED == ret) { // maybe ddl merge task has finished
-      if (is_commit_success()) {
-        ret = OB_SUCCESS;
-        FLOG_INFO("ddl commit already succeed", K(start_scn), K(commit_scn), K(*this));
-      }
-    }
   }
   return ret;
 }
diff --git a/src/storage/ddl/ob_tablet_ddl_kv_mgr.h b/src/storage/ddl/ob_tablet_ddl_kv_mgr.h
index 5bc2f233d2..8efc093981 100644
--- a/src/storage/ddl/ob_tablet_ddl_kv_mgr.h
+++ b/src/storage/ddl/ob_tablet_ddl_kv_mgr.h
@@ -80,7 +80,6 @@ public:
   int get_ddl_major_merge_param(const ObTabletMeta &tablet_meta, ObDDLTableMergeDagParam &merge_param);
   int get_rec_scn(share::SCN &rec_scn);
   void prepare_info_for_checksum_report(const uint64_t table_id, const int64_t ddl_task_id) { table_id_ = table_id; ddl_task_id_ = ddl_task_id; }
-  int ddl_recover_nolock(const ObITable::TableKey &table_key, const share::SCN &start_scn, const int64_t data_format_version, const int64_t execution_id, const share::SCN &commit_scn);
   TO_STRING_KV(K_(is_inited), K_(success_start_scn), K_(ls_id), K_(tablet_id), K_(table_key),
       K_(data_format_version), K_(start_scn), K_(commit_scn), K_(max_freeze_scn),
       K_(table_id), K_(execution_id), K_(ddl_task_id), K_(head), K_(tail), K_(ref_cnt));
@@ -98,9 +97,8 @@ private:
   void cleanup_unlock();
   void destroy();
   bool is_commit_success_unlock() const;
-public:
-  static const int64_t MAX_DDL_KV_CNT_IN_STORAGE = 64;
 private:
+  static const int64_t MAX_DDL_KV_CNT_IN_STORAGE = 64;
   bool is_inited_;
   share::SCN success_start_scn_;
   share::ObLSID ls_id_;