System.Data.Entity.Infrastructure.CommitFailedException：C＃Multithreading＆SQL Server 2012

我们有一个C＃multithreading（100线程）程序，它从数据库中读取记录，每个线程获取一条记录（每个线程一个entity framework连接）并更新单个数据库表。

在最初的几分钟（5分钟）内，程序运行正常，然后突然所有线程都开始抛出以下错误消息。大约1分钟后一切都会恢复正常阶段..我认为SQL Server也是如此单个数据库表的许多锁（可能试图获取该表上的表锁）或与单个数据库的连接太多并关闭所有连接。

我无法调试此问题，有人可以帮助我获取以下信息，

  1. SQL Server 2012在哪里存储其日志？

  2. 我们是否可以增加日志级别以查看在保存数据库实体时它抛出exception的原因

  3. 如何获取每个表的锁数，DB获取的不同类型的锁（表锁，页锁，num行锁等）

  4. 任何其他指针来调试此问题。

仅供参考，我从sqdror日志中找不到任何有用的东西（SELECT SERVERPROPERTY（’ErrorLogFileName’））

这是exception的堆栈跟踪

System.Data.Entity.Infrastructure.CommitFailedException：提交数据库事务时报告了错误，但无法确定数据库服务器上的事务是成功还是失败。 有关详细信息，请参阅内部exception和http://go.microsoft.com/fwlink/?LinkId=313468 。

System.Data.SqlClient.SqlException：超时已过期。 操作完成之前经过的超时时间或服务器没有响应。

System.ComponentModel.Win32Exception：等待操作超时

在System.Data.SqlClient.SqlInternalConnection.OnError（SqlExceptionexception，Boolean breakConnection，Action 1 wrapCloseInAction)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
at System.Data.SqlClient.TdsParserStateObject.ReadSniError(TdsParserStateObject stateObj, UInt32 error)
at System.Data.SqlClient.TdsParserStateObject.ReadSniSyncOverAsync()
at System.Data.SqlClient.TdsParserStateObject.TryReadNetworkPacket()
at System.Data.SqlClient.TdsParserStateObject.TryPrepareBuffer()
at System.Data.SqlClient.TdsParserStateObject.TryReadByte(Byte& value)
at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
at System.Data.SqlClient.TdsParser.TdsExecuteTransactionManagerRequest(Byte[] buffer, TransactionManagerRequestType request, String transactionName, TransactionManagerIsolationLevel isoLevel, Int32 timeout, SqlInternalTransaction transaction, TdsParserStateObject stateObj, Boolean isDelegateControlRequest)
at System.Data.SqlClient.SqlInternalConnectionTds.ExecuteTransactionYukon(TransactionRequest transactionRequest, String transactionName, IsolationLevel iso, SqlInternalTransaction internalTransaction, Boolean isDelegateControlRequest)
at System.Data.SqlClient.SqlInternalConnectionTds.ExecuteTransaction(TransactionRequest transactionRequest, String name, IsolationLevel iso, SqlInternalTransaction internalTransaction, Boolean isDelegateControlRequest)
at System.Data.SqlClient.SqlInternalTransaction.Commit()
at System.Data.SqlClient.SqlTransaction.Commit()
at System.Data.Entity.Infrastructure.Interception.DbTransactionDispatcher.b__c(DbTransaction t, DbTransactionInterceptionContext c)
at System.Data.Entity.Infrastructure.Interception.InternalDispatcher 1 wrapCloseInAction)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
at System.Data.SqlClient.TdsParserStateObject.ReadSniError(TdsParserStateObject stateObj, UInt32 error)
at System.Data.SqlClient.TdsParserStateObject.ReadSniSyncOverAsync()
at System.Data.SqlClient.TdsParserStateObject.TryReadNetworkPacket()
at System.Data.SqlClient.TdsParserStateObject.TryPrepareBuffer()
at System.Data.SqlClient.TdsParserStateObject.TryReadByte(Byte& value)
at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
at System.Data.SqlClient.TdsParser.TdsExecuteTransactionManagerRequest(Byte[] buffer, TransactionManagerRequestType request, String transactionName, TransactionManagerIsolationLevel isoLevel, Int32 timeout, SqlInternalTransaction transaction, TdsParserStateObject stateObj, Boolean isDelegateControlRequest)
at System.Data.SqlClient.SqlInternalConnectionTds.ExecuteTransactionYukon(TransactionRequest transactionRequest, String transactionName, IsolationLevel iso, SqlInternalTransaction internalTransaction, Boolean isDelegateControlRequest)
at System.Data.SqlClient.SqlInternalConnectionTds.ExecuteTransaction(TransactionRequest transactionRequest, String name, IsolationLevel iso, SqlInternalTransaction internalTransaction, Boolean isDelegateControlRequest)
at System.Data.SqlClient.SqlInternalTransaction.Commit()
at System.Data.SqlClient.SqlTransaction.Commit()
at System.Data.Entity.Infrastructure.Interception.DbTransactionDispatcher.b__c(DbTransaction t, DbTransactionInterceptionContext c)
at System.Data.Entity.Infrastructure.Interception.InternalDispatcher 1 wrapCloseInAction)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
at System.Data.SqlClient.TdsParserStateObject.ReadSniError(TdsParserStateObject stateObj, UInt32 error)
at System.Data.SqlClient.TdsParserStateObject.ReadSniSyncOverAsync()
at System.Data.SqlClient.TdsParserStateObject.TryReadNetworkPacket()
at System.Data.SqlClient.TdsParserStateObject.TryPrepareBuffer()
at System.Data.SqlClient.TdsParserStateObject.TryReadByte(Byte& value)
at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
at System.Data.SqlClient.TdsParser.TdsExecuteTransactionManagerRequest(Byte[] buffer, TransactionManagerRequestType request, String transactionName, TransactionManagerIsolationLevel isoLevel, Int32 timeout, SqlInternalTransaction transaction, TdsParserStateObject stateObj, Boolean isDelegateControlRequest)
at System.Data.SqlClient.SqlInternalConnectionTds.ExecuteTransactionYukon(TransactionRequest transactionRequest, String transactionName, IsolationLevel iso, SqlInternalTransaction internalTransaction, Boolean isDelegateControlRequest)
at System.Data.SqlClient.SqlInternalConnectionTds.ExecuteTransaction(TransactionRequest transactionRequest, String name, IsolationLevel iso, SqlInternalTransaction internalTransaction, Boolean isDelegateControlRequest)
at System.Data.SqlClient.SqlInternalTransaction.Commit()
at System.Data.SqlClient.SqlTransaction.Commit()
at System.Data.Entity.Infrastructure.Interception.DbTransactionDispatcher.b__c(DbTransaction t, DbTransactionInterceptionContext c)
at System.Data.Entity.Infrastructure.Interception.InternalDispatcher 1.Dispatch [TTarget，TInterceptionContext]（TTarget目标，Action 2 operation, TInterceptionContext interceptionContext, Action 3执行，Action`3执行）
—内部exception堆栈跟踪结束—

at System.Data.Entity.Infrastructure.Interception.InternalDispatcher 1.Dispatch[TTarget,TInterceptionContext](TTarget target, Action 2操作，TInterceptionContext interceptionContext，Action 3 executing, Action 3执行）
在System.Data.Entity.Infrastructure.Interception.DbTransactionDispatcher.Commit（DbTransaction事务，DbInterceptionContext interceptionContext）
在System.Data.Entity.Core.EntityClient.EntityTransaction.Commit（）
在System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction [T]（Func 1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)
at System.Data.Entity.Core.Objects.ObjectContext.SaveChangesToStore(SaveOptions options, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction)
at System.Data.Entity.Core.Objects.ObjectContext.c__DisplayClass2a.b__27()
at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func 1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)
at System.Data.Entity.Core.Objects.ObjectContext.SaveChangesToStore(SaveOptions options, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction)
at System.Data.Entity.Core.Objects.ObjectContext.c__DisplayClass2a.b__27()
at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func 1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess)
at System.Data.Entity.Core.Objects.ObjectContext.SaveChangesToStore(SaveOptions options, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction)
at System.Data.Entity.Core.Objects.ObjectContext.c__DisplayClass2a.b__27()
at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func 1操作）
在System.Data.Entity.Core.Objects.ObjectContext.SaveChangesInternal（SaveOptions选项，Boolean executeInExistingTransaction）
在System.Data.Entity.Core.Objects.ObjectContext.SaveChanges（SaveOptions选项）
在System.Data.Entity.Internal.InternalContext.SaveChanges（）
在System.Data.Entity.Internal.LazyInternalContext.SaveChanges（）
在System.Data.Entity.DbContext.SaveChanges（）

我曾经面对同样的问题。如果线程应用程序为所有线程使用相同的上下文对象，我们将面临这些问题。 为每个线程创建单独的上下文对象。您可能会在RAM上添加更多负载，但它可以清楚地了解Context中的enities状态。 

 List tasks = new List(); foreach (var item in list) { ObjectContext oContext = new ObjectContext("MyConnection"); Task t = Task.Factory.StartNew(() => { this.Update(item,oContext); }); tasks.Add(t); } Task.WaitAll(tasks.ToArray());
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