diff --git a/src/storage/ddl/ob_complement_data_task.cpp b/src/storage/ddl/ob_complement_data_task.cpp
index b27601b61d..a0b032797d 100644
--- a/src/storage/ddl/ob_complement_data_task.cpp
+++ b/src/storage/ddl/ob_complement_data_task.cpp
@@ -158,7 +158,7 @@ int ObComplementDataParam::split_task_ranges(
     ObArrayArray<ObStoreRange> multi_range_split_array;
     ObParallelBlockRangeTaskParams params;
     params.parallelism_ = hint_parallelism;
-    params.expected_task_load_ = tablet_size / 1024 / 1024;
+    params.expected_task_load_ = tablet_size / 1024 / 1024 <= 0 ? sql::OB_EXPECTED_TASK_LOAD : tablet_size / 1024 / 1024;
     if (OB_FAIL(ranges.push_back(range))) {
       LOG_WARN("push back range failed", K(ret));
     } else if (OB_FAIL(tablet_service->get_multi_ranges_cost(tablet_id,
diff --git a/src/storage/ddl/ob_tablet_ddl_kv_mgr.cpp b/src/storage/ddl/ob_tablet_ddl_kv_mgr.cpp
index d90d8fbcc9..6f6b952de2 100644
--- a/src/storage/ddl/ob_tablet_ddl_kv_mgr.cpp
+++ b/src/storage/ddl/ob_tablet_ddl_kv_mgr.cpp
@@ -309,7 +309,7 @@ int ObTabletDDLKvMgr::wait_ddl_merge_success(const SCN &start_scn, const SCN &co
         LOG_WARN("check status failed", K(ret));
       } else if (OB_FAIL(schedule_ddl_merge_task(start_scn, commit_scn, false/*is_replay*/, table_id, ddl_task_id))) {
         if (OB_EAGAIN == ret) {
-          ob_usleep(10L * 1000L);
+          ob_usleep(100L); // 100us.
           ret = OB_SUCCESS; // retry
         } else {
           LOG_WARN("commit ddl log failed", K(ret), K(start_scn), K(commit_scn), K(ls_id_), K(tablet_id_));