diff --git a/sessionctx/variable/tidb_vars.go b/sessionctx/variable/tidb_vars.go
index 4b5d3bb75726c..94e9fba6385c9 100644
--- a/sessionctx/variable/tidb_vars.go
+++ b/sessionctx/variable/tidb_vars.go
@@ -262,8 +262,8 @@ const (
 	DefTiDBHashJoinConcurrency       = 5
 	DefTiDBProjectionConcurrency     = 4
 	DefTiDBOptimizerSelectivityLevel = 0
-	DefTiDBDDLReorgWorkerCount       = 16
-	DefTiDBDDLReorgBatchSize         = 1024
+	DefTiDBDDLReorgWorkerCount       = 4
+	DefTiDBDDLReorgBatchSize         = 256
 	DefTiDBHashAggPartialConcurrency = 4
 	DefTiDBHashAggFinalConcurrency   = 4
 	DefTiDBForcePriority             = mysql.NoPriority