diff --git a/cmd/soar/soar.go b/cmd/soar/soar.go
index 500a40ea29805f6c020f4c4bd4516d82c914042c..5332df5a30ebaeb034356dee5f41ea468ae07fc0 100644
--- a/cmd/soar/soar.go
+++ b/cmd/soar/soar.go
@@ -278,7 +278,7 @@ func main() {
 				explainInfo, err := rEnv.Explain(q.Query,
 					database.ExplainType[common.Config.ExplainType],
 					database.ExplainFormatType[common.Config.ExplainFormat])
-				if err != nil && strings.HasPrefix(vEnv.Database, "optimizer_") {
+				if err != nil {
 					// 线上环境执行失败才到测试环境 EXPLAIN，比如在用户提供建表语句及查询语句的场景
 					common.Log.Warn("rEnv.Explain Warn: %v", err)
 					explainInfo, err = vEnv.Explain(q.Query,
diff --git a/env/env.go b/env/env.go
index 9b3f6ea0910b441df8a4b121d1a3ba7f0ed8e2b2..cbffde9d86e31fcd45ac71321b35913e6f2fd31f 100644
--- a/env/env.go
+++ b/env/env.go
@@ -122,6 +122,7 @@ func (ve VirtualEnv) RealDB(hash string) string {
 	if _, ok := ve.hash2Db[hash]; ok {
 		return ve.hash2Db[hash]
 	}
+	common.Log.Error("RealDB, missing hash map: %s", hash)
 	return hash
 }
 
@@ -355,7 +356,9 @@ func (ve VirtualEnv) createDatabase(rEnv database.Connector, dbName string) erro
 	}
 
 	// optimizer_YYMMDDHHmmss_xxxx
-	dbHash := fmt.Sprintf("optimizer_%s_%s", time.Now().Format("060102150405"), uniuri.New())
+	dbHash := fmt.Sprintf("optimizer_%s_%s", // Total 39 bytes
+		time.Now().Format("060102150405"), // 12 Bytes 20180102030405
+		strings.ToLower(uniuri.New()))     // 16 Bytes random string
 	common.Log.Debug("createDatabase, mapping `%s` :`%s`-->`%s`", dbName, dbName, dbHash)
 	ddl, err := rEnv.ShowCreateDatabase(dbName)
 	if err != nil {