제한 시간이 만료되었습니다 -> 지정된 MySQL 호스트에 연결할 수 없습니다.

Question

매우 실망스러운 문제가 예상되며 이유를 찾을 수 없습니다.

MySQL 데이터베이스를 사용하는 Azure에서 호스팅되는 앱이 있습니다. Oracle (6.10.5)에서 MySQL.Data nuget을 사용하고 있습니다. 매우 자주 나는 지정된 MySQL 호스트 (24 시간당 12 개) 중 하나에 연결할 수 없음과 함께 제한 시간 만료 오류가 발생합니다.

Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. 
Exception Details: MySql.Data.MySqlClient.MySqlException: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. 

스택 추적 :

Event code: 3005 

Event message: An unhandled exception has occurred. 

Event time: 22/12/2017 14:40:56 

Event time (UTC): 22/12/2017 14:40:56 

Event ID: 503190c80af54cdb87140fe1f808de22 

Event sequence: 16 

Event occurrence: 5 

Event detail code: 0 



Application information: 

    Application domain: /LM/W3SVC/41351921/ROOT-1-131584264107173868 

    Trust level: Full 

    Application Virtual Path:/

    Application Path: D:\home\site\wwwroot\ 

    Machine name: RD00155D58C141 



Process information: 

    Process ID: 10784 

    Process name: w3wp.exe 

    Account name: IIS APPPOOL\xxxx 



Exception information: 

    Exception type: MySqlException 

    Exception message: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. 
    at MySql.Data.Common.StreamCreator.GetTcpStream(MySqlConnectionStringBuilder settings) 
    at MySql.Data.Common.StreamCreator.GetStream(MySqlConnectionStringBuilder settings) 
    at MySql.Data.MySqlClient.NativeDriver.Open() 





Request information: 

    Request URL: http://xxxxx.azurewebsites.net/ 

    Request path:/

    User host address: xx.xxx.xxx.xx 

    User: xxxxx 

    Is authenticated: True 

    Authentication Type: ApplicationCookie 

    Thread account name: IIS APPPOOL\xxxx 



Thread information: 

    Thread ID: 35 

    Thread account name: IIS APPPOOL\xxxx 

    Is impersonating: False 

    Stack trace: at MySql.Data.Common.StreamCreator.GetTcpStream(MySqlConnectionStringBuilder settings) 
    at MySql.Data.Common.StreamCreator.GetStream(MySqlConnectionStringBuilder settings) 
    at MySql.Data.MySqlClient.NativeDriver.Open() 

내 로컬 컴퓨터에서이 오류를 트리거 할 수 없습니다

[MySqlException (0x80004005): Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.] 
    MySql.Data.Common.StreamCreator.GetTcpStream(MySqlConnectionStringBuilder settings) +177 
    MySql.Data.Common.StreamCreator.GetStream(MySqlConnectionStringBuilder settings) +37 
    MySql.Data.MySqlClient.NativeDriver.Open() +55 

[MySqlException (0x80004005): Unable to connect to any of the specified MySQL hosts.] 
    MySql.Data.MySqlClient.NativeDriver.Open() +151 
    MySql.Data.MySqlClient.Driver.Open() +50 
    MySql.Data.MySqlClient.Driver.Create(MySqlConnectionStringBuilder settings) +225 
    MySql.Data.MySqlClient.MySqlPool.CreateNewPooledConnection() +15 
    MySql.Data.MySqlClient.MySqlPool.GetPooledConnection() +288 
    MySql.Data.MySqlClient.MySqlPool.TryToGetDriver() +93 
    MySql.Data.MySqlClient.MySqlPool.GetConnection() +65 
    MySql.Data.MySqlClient.MySqlConnection.Open() +629 
    SalesManager.Models.ConnectionClass.QueryExec() in C:\Users\Gabinet\Source\Repos\SalesManager\SalesManager\SalesManager\Models\Data\ConnectionClass.cs:39 
    SalesManager.Models.ProductDownload.GetStorageQuantity(Int32 id) in C:\Users\Gabinet\Source\Repos\SalesManager\SalesManager\SalesManager\Models\ProductDownload.cs:58 
    SalesManager.Controllers.SalesController.Index(String sortOrder, String df, String dt) in C:\Users\Gabinet\Source\Repos\SalesManager\SalesManager\SalesManager\Controllers\SalesController.cs:41 
    lambda_method(Closure , ControllerBase , Object[]) +194 
    System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +19 
    System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +169 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +27 
    System.Web.Mvc.Async.AsyncControllerActionInvoker.<BeginInvokeSynchronousActionMethod>b__39(IAsyncResult asyncResult, ActionInvocation innerInvokeState) +24 
    System.Web.Mvc.Async.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult) +31 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +50 
    System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +33 
    System.Web.Mvc.Async.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3d() +50 
    System.Web.Mvc.Async.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() +228 
    System.Web.Mvc.Async.<>c__DisplayClass33.<BeginInvokeActionMethodWithFilters>b__32(IAsyncResult asyncResult) +15 
    System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +15 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +50 
    System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +35 
    System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +26 
    System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +100 
    System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +15 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +50 
    System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +29 
    System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +15 
    System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +29 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +50 
    System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +36 
    System.Web.Mvc.Controller.<BeginExecute>b__15(IAsyncResult asyncResult, Controller controller) +14 
    System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +22 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +50 
    System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +27 
    System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +12 
    System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +21 
    System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +29 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +50 
    System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +29 
    System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +11 
    System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +577 
    System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +157 

푸른 앱 통찰력은 제한 시간을 제공합니다. Azure에서 My SQL db에 대해 ping을 수행 할 수 있습니다. 자격증은 정상입니다. 로컬 컴퓨터에서 정상적으로 작동합니다.

연결 클래스 :

public static int GetStorageQuantity(int id) 
{ 
    if (id != 9999) 
    { 
     connection = new ConnectionClass(); 
     string sql = "select quantity from ps_stock_available where id_product = @pId"; 
      connection.MySqlQueryWithParam(sql, "@pId", id.ToString()); 
      var dr = connection.QueryExec().Rows[0]; 
      var quantity = Convert.ToInt32(dr["quantity"].ToString()); 
      return quantity; 
    } 
    return 0; 
} 

내 생각은 내가 잘 알고 아니에요 연결 풀에 관련된 무언가를 놓치고 있다는 것입니다 : 실패

using System; 
using System.Collections.Generic; 
using System.Data; 
using System.Data.SqlClient; 
using System.Linq; 
using System.Web; 
using MySql.Data.MySqlClient; 

namespace SalesManager.Models 
{ 
    public class ConnectionClass : IDisposable 
    { 
     private MySqlConnection _con; 
     private MySqlCommand _cmd; 
     private MySqlDataAdapter _da; 
     private DataTable _dt; 

     private string _constr = 
      "Server=mysqldb.com; Database=databaseName; Uid=database_user; Pwd=database_pass; Default Command Timeout=300000; "; 

     public ConnectionClass() 
     { 
      _con = new MySqlConnection(_constr); 
     } 

     public void MySqlQuery(string sqlquery) 
     { 
      _cmd = new MySqlCommand(sqlquery, _con); 
     } 

     public void MySqlQueryWithParam(string sqlquery, string paramName, string paramValue) 
     { 
      _cmd = new MySqlCommand(sqlquery, _con); 
      _cmd.Parameters.AddWithValue(paramName, paramValue); 
     } 

     public DataTable QueryExec() 
     { 
      _con.Open(); 
      _da = new MySqlDataAdapter(_cmd); 
      _dt = new DataTable(); 
      _da.Fill(_dt); 
      _con.Dispose(); 
      return _dt; 
     } 

     public void NonQueryExec() 
     { 
      _con.Open(); 
      _cmd.ExecuteNonQuery(); 
      _con.Dispose(); 
     } 

     public void Dispose() 
     { 
      _con.Close(); 
      _con.Dispose(); 
     } 
    } 
} 

방법.

어떤 이유 일 수 있습니다. 그 밖의 무엇을 확인할 수 있습니까?

귀하의 도움을 많이 주시면 감사하겠습니다. 이와 같은 경우에

Answer 1

, 그것은 ... 당신의 일회용 물건을 사용하여 시작 항상 가치가

using (var connection = new ConnectionClass()) { 
    //... 
} 

당신은 폐쇄되고 너무 많은 연결을 만드는 것을 가능한 경우 GC 호출 dispose 메소드 using 문을 사용하면 연결이 이전에 닫혀 문제가 해결 될 수 있습니다.

다른 요인으로 인해 문제가 발생할 수도 있지만 유사한 연결 문제를 해결하기 위해 의도적으로 연결을 끊는 것으로 나타났습니다.