diff --git a/config/config.go b/config/config.go
index 93ca18fccfdc4..a1b2b4938e92a 100644
--- a/config/config.go
+++ b/config/config.go
@@ -422,6 +422,7 @@ type Performance struct {
 	MemProfileInterval    string  `toml:"mem-profile-interval" json:"mem-profile-interval"`
 	IndexUsageSyncLease   string  `toml:"index-usage-sync-lease" json:"index-usage-sync-lease"`
 	GOGC                  int     `toml:"gogc" json:"gogc"`
+	EnforceMPP            bool    `toml:"enforce-mpp" json:"enforce-mpp"`
 }
 
 // PlanCache is the PlanCache section of the config.
@@ -618,6 +619,7 @@ var defaultConf = Config{
 		// TODO: set indexUsageSyncLease to 60s.
 		IndexUsageSyncLease: "0s",
 		GOGC:                100,
+		EnforceMPP:          false,
 	},
 	ProxyProtocol: ProxyProtocol{
 		Networks:      "",
diff --git a/sessionctx/variable/sysvar.go b/sessionctx/variable/sysvar.go
index 5d8190ee45ad7..ec7f4201a65b1 100644
--- a/sessionctx/variable/sysvar.go
+++ b/sessionctx/variable/sysvar.go
@@ -580,8 +580,8 @@ var defaultSysVars = []*SysVar{
 		return oracle.LocalTxnScope
 	}()},
 	/* TiDB specific variables */
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBAllowMPPExecution, Type: TypeBool, Value: BoolToOnOff(DefTiDBAllowMPPExecution)},
-	{Scope: ScopeGlobal | ScopeSession, Name: TiDBEnforceMPPExecution, Type: TypeBool, Value: BoolToOnOff(DefTiDBEnforceMPPExecution)},
+	{Scope: ScopeGlobal | ScopeSession, Name: TiDBAllowMPPExecution, Type: TypeBool, Value: BoolToOnOff(config.GetGlobalConfig().Performance.EnforceMPP)},
+	{Scope: ScopeSession, Name: TiDBEnforceMPPExecution, Type: TypeBool, Value: BoolToOnOff(DefTiDBEnforceMPPExecution)},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBBCJThresholdCount, Value: strconv.Itoa(DefBroadcastJoinThresholdCount), Type: TypeInt, MinValue: 0, MaxValue: math.MaxInt64},
 	{Scope: ScopeGlobal | ScopeSession, Name: TiDBBCJThresholdSize, Value: strconv.Itoa(DefBroadcastJoinThresholdSize), Type: TypeInt, MinValue: 0, MaxValue: math.MaxInt64},
 	{Scope: ScopeSession, Name: TiDBSnapshot, Value: ""},
diff --git a/tidb-server/main.go b/tidb-server/main.go
index f9cb021a894e8..b2fe742d67b2b 100644
--- a/tidb-server/main.go
+++ b/tidb-server/main.go
@@ -568,7 +568,8 @@ func setGlobalVars() {
 	variable.SetSysVar(variable.Socket, cfg.Socket)
 	variable.SetSysVar(variable.DataDir, cfg.Path)
 	variable.SetSysVar(variable.TiDBSlowQueryFile, cfg.Log.SlowQueryFile)
-	variable.SetSysVar(variable.TiDBIsolationReadEngines, strings.Join(cfg.IsolationRead.Engines, ", "))
+	variable.SetSysVar(variable.TiDBIsolationReadEngines, strings.Join(cfg.IsolationRead.Engines, ","))
+	variable.SetSysVar(variable.TiDBEnforceMPPExecution, variable.BoolToOnOff(config.GetGlobalConfig().Performance.EnforceMPP))
 	variable.MemoryUsageAlarmRatio.Store(cfg.Performance.MemoryUsageAlarmRatio)
 
 	// For CI environment we default enable prepare-plan-cache.