从池中获取连接之前的超时时间已过，所有池连接都在使用中并且达到最大池大小

Question

我有一个 exe，它给出了以下错误。

超时。在获得一个之前的超时时间 来自池的连接。这可能是因为所有汇集的 正在使用连接并且已达到最大池大小。

我已经使用使用语句来创建连接对象并关闭 finally 块中的连接。

在exe连接字符串的web.config中，app_pool size最大值为200。

我还使用 sp_who2 命令检查了连接，该命令显示 25 个连接。

private Dictionary<string, SomeObject> SomeMethod(int orderedXmlId, string clientLogFilePath, ref bool errorGettingRMData)
        {
            Dictionary<string, SomeObject> someDictionary = new Dictionary<string, SomeObject>();
            //Create connection object
            using (SqlConnection connection = new SqlConnection(ConfigurationSettings.AppSettings["MasterDB"]))
            {
                SqlCommand command = null;
                try
                {
                    //open the connection
                    connection.Open();
                    command = new SqlCommand("someSP", connection);
                    command.CommandType = CommandType.StoredProcedure;
                    command.Parameters.AddWithValue("@someParameter", someParameter);
                    command.CommandTimeout = _commandTimeOut;

                    using (SqlDataReader someVariable = command.ExecuteReader(CommandBehavior.CloseConnection))
                    {
                        if (someVariable != null && someVariable.HasRows)
                        {
                            int intId = someVariable.GetOrdinal("intId");
                            int imageUrl = someVariable.GetOrdinal("imageUrl");
                            int contentLength = someVariable.GetOrdinal("contentLength");
                            int path = someVariable.GetOrdinal("path");
                            int parentId = someVariable.GetOrdinal("parentId");
                            int propertyId = someVariable.GetOrdinal("propertyId");

                            while (someVariable.Read())
                            {
                                using (SomeObject someUploadObject = new SomeObject())
                                {
                                    // Avoid this Exception: "An item with the same key has already been added".
                                    if (!someDictionary.ContainsKey(someVariable.GetString(intImageUrlOrdinal)))
                                    {
                                        someUploadObject.OrderedXmlId =
                                            someVariable.GetInt32(intOrderedXMLIdOrdinal);
                                        someUploadObject.ImageUrl = someVariable.GetString(intImageUrlOrdinal);
                                        someUploadObject.ContentLength =
                                            someVariable.GetInt64(intContentLengthOrdinal);
                                        someUploadObject.SaveAsPath = someVariable.GetString(intSaveAsPathOrdinal);
                                        someUploadObject.ParentOrderedXmlId =
                                            someVariable.GetInt32(intParentOrderedXmlIdOrdinal);
                                        someUploadObject.PropertyId = someVariable.GetString(intPropertyIdOrdinal);

                                        //Add to Dictionary
                                        someDictionary.Add(someUploadObject.ImageUrl, someUploadObject);
                                    }
                                    else
                                    {
                                        if (detailedLog)
                                        {
                                            AddToLog("SomeMethod: Image {0}, for id:{1} is already present in someDictionary",
                                                                     new object[] { someVariable.GetString(imageUrlOrdinal), lId }, 80,
                                                                     false, true, clientLogFilePath);
                                        }
                                    }
                                }
                            }
                            someVariable.Close();
                        }
                        //No records are found i.e. Datareader is empty
                        else
                        {
                            //Do nothing
                        }
                    }
                }
                catch (Exception ex)
                {
                    errorGettingData = true;
                    Logger.Write2Log("SomeMethod: Error in retrieving uploaded images for id:" + Id + "-" + ex.Message, true, 40, true, logFilePath);
                    SendMail(MailOption.exception, ex, logFilePath);
                }
                finally
                {
                    command = null;
                    if (connection != null)
                    {
                        connection.Close();
                    }
                }
                //Return list of Dictionary
                return someDictionary;
            }
        } //SomeMethod

知道这里可能出了什么问题吗？

Answer 1

嗯，错误是自我描述的。从通常的嫌疑人开始：

1. 检查您的服务器是否真的使用了您想要的配置（而不是限制为 25 个连接的配置）。看看问题是否真的从那个数字开始。
2. 如果可能，请直接检查池 - 如果是您建立的连接被占用，那么您没有正确丢弃它们 - 通常有一个模式来处理这个问题。使用它，不要重新发明轮子。