diff --git a/server/internal/db/api/db.go b/server/internal/db/api/db.go
index 8d6bac7b..4af65bf4 100644
--- a/server/internal/db/api/db.go
+++ b/server/internal/db/api/db.go
@@ -63,18 +63,6 @@ func (d *Db) Save(rc *req.Ctx) {
 	d.DbApp.Save(db)
 }
 
-// 获取数据库实例的所有数据库名
-func (d *Db) GetDatabaseNames(rc *req.Ctx) {
-	form := &form.DbForm{}
-	ginx.BindJsonAndValid(rc.GinCtx, form)
-
-	instance := d.InstanceApp.GetById(form.InstanceId, "Password")
-	biz.NotNil(instance, "获取数据库实例错误")
-	instance.PwdDecrypt()
-	rc.ResData = d.InstanceApp.GetDatabases(instance)
-	rc.ResData = d.InstanceApp.GetDatabases(instance)
-}
-
 func (d *Db) DeleteDb(rc *req.Ctx) {
 	idsStr := ginx.PathParam(rc.GinCtx, "dbId")
 	rc.ReqParam = idsStr
@@ -94,9 +82,7 @@ func (d *Db) getDbConnection(g *gin.Context) *application.DbConnection {
 	dbName := g.Query("db")
 	biz.NotEmpty(dbName, "db不能为空")
 	dbId := getDbId(g)
-	db := d.DbApp.GetById(dbId)
-	instance := d.InstanceApp.GetById(db.InstanceId)
-	return d.DbApp.GetDbConnection(db, instance, dbName)
+	return d.DbApp.GetDbConnection(dbId, dbName)
 }
 
 func (d *Db) TableInfos(rc *req.Ctx) {
@@ -121,12 +107,10 @@ func (d *Db) ExecSql(rc *req.Ctx) {
 	ginx.BindJsonAndValid(g, form)
 
 	dbId := getDbId(g)
-	db := d.DbApp.GetById(dbId)
-	instance := d.InstanceApp.GetById(db.InstanceId)
-	dbInstance := d.DbApp.GetDbConnection(db, instance, form.Db)
-	biz.ErrIsNilAppendErr(d.TagApp.CanAccess(rc.LoginAccount.Id, dbInstance.Info.TagPath), "%s")
+	dbConn := d.DbApp.GetDbConnection(dbId, form.Db)
+	biz.ErrIsNilAppendErr(d.TagApp.CanAccess(rc.LoginAccount.Id, dbConn.Info.TagPath), "%s")
 
-	rc.ReqParam = fmt.Sprintf("%s\n-> %s", dbInstance.Info.GetLogDesc(), form.Sql)
+	rc.ReqParam = fmt.Sprintf("%s\n-> %s", dbConn.Info.GetLogDesc(), form.Sql)
 	biz.NotEmpty(form.Sql, "sql不能为空")
 
 	// 去除前后空格及换行符
@@ -136,7 +120,7 @@ func (d *Db) ExecSql(rc *req.Ctx) {
 		DbId:         dbId,
 		Db:           form.Db,
 		Remark:       form.Remark,
-		DbInstance:   dbInstance,
+		DbConn:       dbConn,
 		LoginAccount: rc.LoginAccount,
 	}
 
@@ -180,9 +164,9 @@ func (d *Db) ExecSqlFile(rc *req.Ctx) {
 	dbId := getDbId(g)
 	dbName := getDbName(g)
 
-	dbInstance := d.getDbConnection(rc.GinCtx)
-	biz.ErrIsNilAppendErr(d.TagApp.CanAccess(rc.LoginAccount.Id, dbInstance.Info.TagPath), "%s")
-	rc.ReqParam = fmt.Sprintf("%s -> filename: %s", dbInstance.Info.GetLogDesc(), filename)
+	dbConn := d.getDbConnection(rc.GinCtx)
+	biz.ErrIsNilAppendErr(d.TagApp.CanAccess(rc.LoginAccount.Id, dbConn.Info.TagPath), "%s")
+	rc.ReqParam = fmt.Sprintf("%s -> filename: %s", dbConn.Info.GetLogDesc(), filename)
 
 	logExecRecord := true
 	// 如果执行sql文件大于该值则不记录sql执行记录
@@ -195,7 +179,7 @@ func (d *Db) ExecSqlFile(rc *req.Ctx) {
 			if err := recover(); err != nil {
 				switch t := err.(type) {
 				case *biz.BizError:
-					d.MsgApp.CreateAndSend(rc.LoginAccount, ws.ErrMsg("sql脚本执行失败", fmt.Sprintf("[%s]%s执行失败: [%s]", filename, dbInstance.Info.GetLogDesc(), t.Error())))
+					d.MsgApp.CreateAndSend(rc.LoginAccount, ws.ErrMsg("sql脚本执行失败", fmt.Sprintf("[%s]%s执行失败: [%s]", filename, dbConn.Info.GetLogDesc(), t.Error())))
 				}
 			}
 		}()
@@ -204,7 +188,7 @@ func (d *Db) ExecSqlFile(rc *req.Ctx) {
 			DbId:         dbId,
 			Db:           dbName,
 			Remark:       fileheader.Filename,
-			DbInstance:   dbInstance,
+			DbConn:       dbConn,
 			LoginAccount: rc.LoginAccount,
 		}
 
@@ -220,15 +204,15 @@ func (d *Db) ExecSqlFile(rc *req.Ctx) {
 			if logExecRecord {
 				_, err = d.DbSqlExecApp.Exec(execReq)
 			} else {
-				_, err = dbInstance.Exec(sql)
+				_, err = dbConn.Exec(sql)
 			}
 
 			if err != nil {
-				d.MsgApp.CreateAndSend(rc.LoginAccount, ws.ErrMsg("sql脚本执行失败", fmt.Sprintf("[%s][%s] -> sql=[%s] 执行失败: [%s]", filename, dbInstance.Info.GetLogDesc(), sql, err.Error())))
+				d.MsgApp.CreateAndSend(rc.LoginAccount, ws.ErrMsg("sql脚本执行失败", fmt.Sprintf("[%s][%s] -> sql=[%s] 执行失败: [%s]", filename, dbConn.Info.GetLogDesc(), sql, err.Error())))
 				return
 			}
 		}
-		d.MsgApp.CreateAndSend(rc.LoginAccount, ws.SuccessMsg("sql脚本执行成功", fmt.Sprintf("[%s]执行完成 -> %s", filename, dbInstance.Info.GetLogDesc())))
+		d.MsgApp.CreateAndSend(rc.LoginAccount, ws.SuccessMsg("sql脚本执行成功", fmt.Sprintf("[%s]执行完成 -> %s", filename, dbConn.Info.GetLogDesc())))
 	}()
 }
 
diff --git a/server/internal/db/api/instance.go b/server/internal/db/api/instance.go
index 3772986b..ad48ec17 100644
--- a/server/internal/db/api/instance.go
+++ b/server/internal/db/api/instance.go
@@ -86,12 +86,6 @@ func (d *Instance) DeleteInstance(rc *req.Ctx) {
 	}
 }
 
-func getInstanceId(g *gin.Context) uint64 {
-	instanceId, _ := strconv.Atoi(g.Param("instanceId"))
-	biz.IsTrue(instanceId > 0, "instanceId 错误")
-	return uint64(instanceId)
-}
-
 // 获取数据库实例的所有数据库名
 func (d *Instance) GetDatabaseNames(rc *req.Ctx) {
 	instanceId := getInstanceId(rc.GinCtx)
@@ -100,3 +94,9 @@ func (d *Instance) GetDatabaseNames(rc *req.Ctx) {
 	instance.PwdDecrypt()
 	rc.ResData = d.InstanceApp.GetDatabases(instance)
 }
+
+func getInstanceId(g *gin.Context) uint64 {
+	instanceId, _ := strconv.Atoi(g.Param("instanceId"))
+	biz.IsTrue(instanceId > 0, "instanceId 错误")
+	return uint64(instanceId)
+}
diff --git a/server/internal/db/application/application.go b/server/internal/db/application/application.go
index 3dd32c4e..910a0e09 100644
--- a/server/internal/db/application/application.go
+++ b/server/internal/db/application/application.go
@@ -6,7 +6,7 @@ import (
 
 var (
 	instanceApp  Instance  = newInstanceApp(persistence.GetInstanceRepo())
-	dbApp        Db        = newDbApp(persistence.GetDbRepo(), persistence.GetDbSqlRepo())
+	dbApp        Db        = newDbApp(persistence.GetDbRepo(), persistence.GetDbSqlRepo(), instanceApp)
 	dbSqlExecApp DbSqlExec = newDbSqlExecApp(persistence.GetDbSqlExecRepo())
 )
 
diff --git a/server/internal/db/application/db.go b/server/internal/db/application/db.go
index 77fcbd5e..4dfcd067 100644
--- a/server/internal/db/application/db.go
+++ b/server/internal/db/application/db.go
@@ -39,19 +39,21 @@ type Db interface {
 	// 获取数据库连接实例
 	// @param id 数据库实例id
 	// @param db 数据库
-	GetDbConnection(db *entity.Db, instance *entity.Instance, dbName string) *DbConnection
+	GetDbConnection(dbId uint64, dbName string) *DbConnection
 }
 
-func newDbApp(dbRepo repository.Db, dbSqlRepo repository.DbSql) Db {
+func newDbApp(dbRepo repository.Db, dbSqlRepo repository.DbSql, dbInstanceApp Instance) Db {
 	return &dbAppImpl{
-		dbRepo:    dbRepo,
-		dbSqlRepo: dbSqlRepo,
+		dbRepo:        dbRepo,
+		dbSqlRepo:     dbSqlRepo,
+		dbInstanceApp: dbInstanceApp,
 	}
 }
 
 type dbAppImpl struct {
-	dbRepo    repository.Db
-	dbSqlRepo repository.DbSql
+	dbRepo        repository.Db
+	dbSqlRepo     repository.DbSql
+	dbInstanceApp Instance
 }
 
 // 分页获取数据库信息列表
@@ -129,11 +131,11 @@ func (d *dbAppImpl) Delete(id uint64) {
 
 var mutex sync.Mutex
 
-func (d *dbAppImpl) GetDbConnection(db *entity.Db, instance *entity.Instance, dbName string) *DbConnection {
-	cacheKey := GetDbCacheKey(db.Id, dbName)
+func (d *dbAppImpl) GetDbConnection(dbId uint64, dbName string) *DbConnection {
+	cacheKey := GetDbCacheKey(dbId, dbName)
 
 	// Id不为0，则为需要缓存
-	needCache := db.Id != 0
+	needCache := dbId != 0
 	if needCache {
 		load, ok := dbCache.Get(cacheKey)
 		if ok {
@@ -143,9 +145,11 @@ func (d *dbAppImpl) GetDbConnection(db *entity.Db, instance *entity.Instance, db
 	mutex.Lock()
 	defer mutex.Unlock()
 
+	db := d.GetById(dbId)
 	biz.NotNil(db, "数据库信息不存在")
 	biz.IsTrue(strings.Contains(" "+db.Database+" ", " "+dbName+" "), "未配置该库的操作权限")
 
+	instance := d.dbInstanceApp.GetById(db.InstanceId)
 	// 密码解密
 	instance.PwdDecrypt()
 
@@ -208,7 +212,7 @@ func (d *DbInfo) GetLogDesc() string {
 	return fmt.Sprintf("DB[id=%d, tag=%s, name=%s, ip=%s:%d, database=%s]", d.Id, d.TagPath, d.Name, d.Host, d.Port, d.Database)
 }
 
-// db实例
+// db实例连接信息
 type DbConnection struct {
 	Id   string
 	Info *DbInfo
@@ -286,13 +290,6 @@ func GetDbCacheKey(dbId uint64, db string) string {
 	return fmt.Sprintf("%d:%s", dbId, db)
 }
 
-func GetDbInstanceByCache(id string) *DbConnection {
-	if load, ok := dbCache.Get(id); ok {
-		return load.(*DbConnection)
-	}
-	return nil
-}
-
 func SelectDataByDb(db *sql.DB, selectSql string) ([]string, []map[string]any, error) {
 	rows, err := db.Query(selectSql)
 	if err != nil {
diff --git a/server/internal/db/application/db_sql_exec.go b/server/internal/db/application/db_sql_exec.go
index 591411ef..3c5ab4d6 100644
--- a/server/internal/db/application/db_sql_exec.go
+++ b/server/internal/db/application/db_sql_exec.go
@@ -20,7 +20,7 @@ type DbSqlExecReq struct {
 	Sql          string
 	Remark       string
 	LoginAccount *model.LoginAccount
-	DbInstance   *DbConnection
+	DbConn       *DbConnection
 }
 
 type DbSqlExecRes struct {
@@ -98,7 +98,7 @@ func (d *dbSqlExecAppImpl) Exec(execSqlReq *DbSqlExecReq) (*DbSqlExecRes, error)
 		if isSelect || strings.HasPrefix(lowerSql, "show") {
 			execRes, execErr = doRead(execSqlReq)
 		} else {
-			execRes, execErr = doExec(execSqlReq.Sql, execSqlReq.DbInstance)
+			execRes, execErr = doExec(execSqlReq.Sql, execSqlReq.DbConn)
 		}
 		if execErr != nil {
 			return nil, execErr
@@ -124,7 +124,7 @@ func (d *dbSqlExecAppImpl) Exec(execSqlReq *DbSqlExecReq) (*DbSqlExecRes, error)
 	case *sqlparser.Insert:
 		execRes, err = doInsert(stmt, execSqlReq, dbSqlExecRecord)
 	default:
-		execRes, err = doExec(execSqlReq.Sql, execSqlReq.DbInstance)
+		execRes, err = doExec(execSqlReq.Sql, execSqlReq.DbConn)
 	}
 	if err != nil {
 		return nil, err
@@ -174,9 +174,9 @@ func doSelect(selectStmt *sqlparser.Select, execSqlReq *DbSqlExecReq) (*DbSqlExe
 }
 
 func doRead(execSqlReq *DbSqlExecReq) (*DbSqlExecRes, error) {
-	dbInstance := execSqlReq.DbInstance
+	dbConn := execSqlReq.DbConn
 	sql := execSqlReq.Sql
-	colNames, res, err := dbInstance.SelectData(sql)
+	colNames, res, err := dbConn.SelectData(sql)
 	if err != nil {
 		return nil, err
 	}
@@ -187,7 +187,7 @@ func doRead(execSqlReq *DbSqlExecReq) (*DbSqlExecRes, error) {
 }
 
 func doUpdate(update *sqlparser.Update, execSqlReq *DbSqlExecReq, dbSqlExec *entity.DbSqlExec) (*DbSqlExecRes, error) {
-	dbInstance := execSqlReq.DbInstance
+	dbConn := execSqlReq.DbConn
 
 	tableStr := sqlparser.String(update.TableExprs)
 	// 可能使用别名，故空格切割
@@ -202,12 +202,12 @@ func doUpdate(update *sqlparser.Update, execSqlReq *DbSqlExecReq, dbSqlExec *ent
 	}
 
 	// 获取表主键列名,排除使用别名
-	primaryKey := dbInstance.GetMeta().GetPrimaryKey(tableName)
+	primaryKey := dbConn.GetMeta().GetPrimaryKey(tableName)
 
 	updateColumnsAndPrimaryKey := strings.Join(updateColumns, ",") + "," + primaryKey
 	// 查询要更新字段数据的旧值，以及主键值
 	selectSql := fmt.Sprintf("SELECT %s FROM %s %s LIMIT 200", updateColumnsAndPrimaryKey, tableStr, where)
-	_, res, err := dbInstance.SelectData(selectSql)
+	_, res, err := dbConn.SelectData(selectSql)
 	if err == nil {
 		bytes, _ := json.Marshal(res)
 		dbSqlExec.OldValue = string(bytes)
@@ -218,11 +218,11 @@ func doUpdate(update *sqlparser.Update, execSqlReq *DbSqlExecReq, dbSqlExec *ent
 	dbSqlExec.Table = tableName
 	dbSqlExec.Type = entity.DbSqlExecTypeUpdate
 
-	return doExec(execSqlReq.Sql, dbInstance)
+	return doExec(execSqlReq.Sql, dbConn)
 }
 
 func doDelete(delete *sqlparser.Delete, execSqlReq *DbSqlExecReq, dbSqlExec *entity.DbSqlExec) (*DbSqlExecRes, error) {
-	dbInstance := execSqlReq.DbInstance
+	dbConn := execSqlReq.DbConn
 
 	tableStr := sqlparser.String(delete.TableExprs)
 	// 可能使用别名，故空格切割
@@ -232,14 +232,14 @@ func doDelete(delete *sqlparser.Delete, execSqlReq *DbSqlExecReq, dbSqlExec *ent
 
 	// 查询删除数据
 	selectSql := fmt.Sprintf("SELECT * FROM %s %s LIMIT 200", tableStr, where)
-	_, res, _ := dbInstance.SelectData(selectSql)
+	_, res, _ := dbConn.SelectData(selectSql)
 
 	bytes, _ := json.Marshal(res)
 	dbSqlExec.OldValue = string(bytes)
 	dbSqlExec.Table = table
 	dbSqlExec.Type = entity.DbSqlExecTypeDelete
 
-	return doExec(execSqlReq.Sql, dbInstance)
+	return doExec(execSqlReq.Sql, dbConn)
 }
 
 func doInsert(insert *sqlparser.Insert, execSqlReq *DbSqlExecReq, dbSqlExec *entity.DbSqlExec) (*DbSqlExecRes, error) {
@@ -249,11 +249,11 @@ func doInsert(insert *sqlparser.Insert, execSqlReq *DbSqlExecReq, dbSqlExec *ent
 	dbSqlExec.Table = table
 	dbSqlExec.Type = entity.DbSqlExecTypeInsert
 
-	return doExec(execSqlReq.Sql, execSqlReq.DbInstance)
+	return doExec(execSqlReq.Sql, execSqlReq.DbConn)
 }
 
-func doExec(sql string, dbInstance *DbConnection) (*DbSqlExecRes, error) {
-	rowsAffected, err := dbInstance.Exec(sql)
+func doExec(sql string, dbConn *DbConnection) (*DbSqlExecRes, error) {
+	rowsAffected, err := dbConn.Exec(sql)
 	execRes := "success"
 	if err != nil {
 		execRes = err.Error()
diff --git a/server/internal/db/router/db.go b/server/internal/db/router/db.go
index 25800869..1b5136bb 100644
--- a/server/internal/db/router/db.go
+++ b/server/internal/db/router/db.go
@@ -29,9 +29,6 @@ func InitDbRouter(router *gin.RouterGroup) {
 
 		req.NewPost("", d.Save).Log(req.NewLogSave("db-保存数据库信息")),
 
-		// 获取数据库实例的所有数据库名
-		req.NewPost("/databases", d.GetDatabaseNames),
-
 		req.NewDelete(":dbId", d.DeleteDb).Log(req.NewLogSave("db-删除数据库信息")),
 
 		req.NewGet(":dbId/t-infos", d.TableInfos),