diff --git a/tidb-server/main.go b/tidb-server/main.go
index 5cd9ba9607e4d..3e544499db4cf 100644
--- a/tidb-server/main.go
+++ b/tidb-server/main.go
@@ -377,6 +377,9 @@ func setGlobalVars() {
 	plan.AllowCartesianProduct = cfg.Performance.CrossJoin
 	privileges.SkipWithGrant = cfg.Security.SkipGrantTable
 
+	variable.SysVars[variable.TIDBMemQuotaQuery].Value = strconv.FormatInt(cfg.MemQuotaQuery, 10)
+	variable.SysVars["lower_case_table_names"].Value = strconv.Itoa(cfg.LowerCaseTableNames)
+
 	if cfg.PlanCache.Enabled {
 		plan.GlobalPlanCache = kvcache.NewShardedLRUCache(cfg.PlanCache.Capacity, cfg.PlanCache.Shards)
 	}
@@ -392,9 +395,6 @@ func setGlobalVars() {
 	tikv.GrpcKeepAliveTime = time.Duration(cfg.TiKVClient.GrpcKeepAliveTime) * time.Second
 	tikv.GrpcKeepAliveTimeout = time.Duration(cfg.TiKVClient.GrpcKeepAliveTimeout) * time.Second
 
-	// set lower_case_table_names
-	variable.SysVars["lower_case_table_names"].Value = strconv.Itoa(cfg.LowerCaseTableNames)
-
 	tikv.CommitMaxBackoff = int(parseDuration(cfg.TiKVClient.CommitTimeout).Seconds() * 1000)
 }