diff --git a/executor/adapter.go b/executor/adapter.go
index 6a5b3262c441a..b7f0761f3bc13 100644
--- a/executor/adapter.go
+++ b/executor/adapter.go
@@ -422,17 +422,11 @@ func (a *ExecStmt) Exec(ctx context.Context) (_ sqlexec.RecordSet, err error) {
 	ctx = util.SetSessionID(ctx, sctx.GetSessionVars().ConnectionID)
 	if _, ok := a.Plan.(*plannercore.Analyze); ok && sctx.GetSessionVars().InRestrictedSQL {
 		oriStats, _ := sctx.GetSessionVars().GetSystemVar(variable.TiDBBuildStatsConcurrency)
-		oriScan := sctx.GetSessionVars().DistSQLScanConcurrency()
-		oriIndex := sctx.GetSessionVars().IndexSerialScanConcurrency()
 		oriIso, _ := sctx.GetSessionVars().GetSystemVar(variable.TxnIsolation)
 		terror.Log(sctx.GetSessionVars().SetSystemVar(variable.TiDBBuildStatsConcurrency, "1"))
-		sctx.GetSessionVars().SetDistSQLScanConcurrency(1)
-		sctx.GetSessionVars().SetIndexSerialScanConcurrency(1)
 		terror.Log(sctx.GetSessionVars().SetSystemVar(variable.TxnIsolation, ast.ReadCommitted))
 		defer func() {
 			terror.Log(sctx.GetSessionVars().SetSystemVar(variable.TiDBBuildStatsConcurrency, oriStats))
-			sctx.GetSessionVars().SetDistSQLScanConcurrency(oriScan)
-			sctx.GetSessionVars().SetIndexSerialScanConcurrency(oriIndex)
 			terror.Log(sctx.GetSessionVars().SetSystemVar(variable.TxnIsolation, oriIso))
 		}()
 	}