EF Code First - Timeout expired. The timeout perio

问题:

Apology for this strangely worded question. I don't know what the actual problem is but hopefully someone can give me some insights.

I am getting the following error when trying to run migrations:

Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding. ---> System.ComponentModel.Win32Exception (0x80004005): The wait operation timed out

It is interesting to note that on my laptop this is not happening but on my VM (azure - large) this is happening with 100% failure rate.

I am using Ef 6.0.0 -rc1. Please note, updating EF is not an option. If updating to EF 6.0.0 or 6.0.1 I will get the following error with 100% failure rate:

Errors during Code First add-migration

I have also timed the error. It takes about 1.5 min to trigger the error. When running with -Verbose flag it was trying to create 200 tables with indexes. Copying the sql query and excuting it in SSMS takes 5 secs.

A few things that I have tired but didn't work:

1) Setting ObjectContext.CommandTimeout = 36000 // 10 hours! as indicated here:

https://stackoverflow.com/a/6234593/305469

2) Setting timeout in connection string in "web.config":

connectionString="Data Source=localhost;Initial Catalog=myDB;Integrated Security=SSPI;Connection Timeout=36000"

3) Setting "machine.config" transaction maxTimeout:

<system.transactions> <machineSettings maxTimeout="00:00:00" /> </system.transactions>

4) Setting "remote query timeout" on sql server

USE MyDB;
GO
EXEC sp_configure 'remote query timeout', 0 ;
GO
RECONFIGURE ;
GO

So what is happening? How come CommandTimeout is not being respected? Any suggestions?

Full trace as follows:

System.Data.SqlClient.SqlException (0x80131904): Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding. ---> System.ComponentModel.Win32Exception (0x80004005): The wait operation timed out

   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   at System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async, Int32 timeout)
   at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean asyncWrite)
   at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
   at System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TInterceptionContext,TResult](Func`1 operation, TInterceptionContext interceptionContext, Action`1 executing, Action`1 executed)
   at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.NonQuery(DbCommand command, DbCommandInterceptionContext interceptionContext)
   at System.Data.Entity.Internal.InterceptableDbCommand.ExecuteNonQuery()
   at System.Data.Entity.Migrations.DbMigrator.ExecuteSql(DbTransaction transaction, MigrationStatement migrationStatement)
   at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.ExecuteSql(DbTransaction transaction, MigrationStatement migrationStatement)
   at System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsInternal(IEnumerable`1 migrationStatements, DbConnection connection)
   at System.Data.Entity.Migrations.DbMigrator.<>c__DisplayClass32.<ExecuteStatements>b__2e()
   at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.<>c__DisplayClass1.<Execute>b__0()
   at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation)
   at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Action operation)
   at System.Data.Entity.Migrations.DbMigrator.ExecuteStatements(IEnumerable`1 migrationStatements)
   at System.Data.Entity.Migrations.Infrastructure.MigratorBase.ExecuteStatements(IEnumerable`1 migrationStatements)
   at System.Data.Entity.Migrations.DbMigrator.ExecuteOperations(String migrationId, XDocument targetModel, IEnumerable`1 operations, IEnumerable`1 systemOperations, Boolean downgrading, Boolean auto)
   at System.Data.Entity.Migrations.DbMigrator.ApplyMigration(DbMigration migration, DbMigration lastMigration)
   at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.ApplyMigration(DbMigration migration, DbMigration lastMigration)
   at System.Data.Entity.Migrations.DbMigrator.Upgrade(IEnumerable`1 pendingMigrations, String targetMigrationId, String lastMigrationId)
   at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.Upgrade(IEnumerable`1 pendingMigrations, String targetMigrationId, String lastMigrationId)
   at System.Data.Entity.Migrations.DbMigrator.UpdateInternal(String targetMigration)
   at System.Data.Entity.Migrations.DbMigrator.<>c__DisplayClassc.<Update>b__b()
   at System.Data.Entity.Migrations.DbMigrator.EnsureDatabaseExists(Action mustSucceedToKeepDatabase)
   at System.Data.Entity.Migrations.Infrastructure.MigratorBase.EnsureDatabaseExists(Action mustSucceedToKeepDatabase)
   at System.Data.Entity.Migrations.DbMigrator.Update(String targetMigration)
   at System.Data.Entity.Migrations.Infrastructure.MigratorBase.Update(String targetMigration)
   at System.Data.Entity.Migrations.Design.ToolingFacade.UpdateRunner.Run()
   at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
   at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
   at System.Data.Entity.Migrations.Design.ToolingFacade.Run(BaseRunner runner)
   at System.Data.Entity.Migrations.Design.ToolingFacade.Update(String targetMigration, Boolean force)
   at System.Data.Entity.Migrations.UpdateDatabaseCommand.<>c__DisplayClass2.<.ctor>b__0()
   at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command)
ClientConnectionId:8cbbc70c-8182-417e-9aca-4603f797340d
Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding.

回答1:

In the constructor of Configuration.cs class (in migration Folder) add the property CommandTimeout = Int32.MaxValue;

回答2:

I restarted the SQL Server service (Win7 - Computer Management > Services and Applications > Services)

回答3:

For me, the problem was that that migration script took a long time to run (15 minutes).

This is how I worked around the issue:
1. Run update-database -script (-force may be necessary)
2. Copy this SQL script output and run in SQL Server Management Studio

回答4:

An FYI EF Migrations pull their timeout from a separate configuration:

public class MyContextConfiguration : DbMigrationsConfiguration<MyContext>
{
    public MyContextConfiguration()
    {
        CommandTimeout = 900;
    }
}

Change the 900 to a something higher, all of the other SQL timeout changes (web.config, etc.) did not do anything, this worked for me.

回答5:

I ran into this in my production environment because it was producing queries like the ones here: Why does Entity Framework 6 generate complex SQL queries for simple lookups?

This is actually related to a bug in this version of EF: https://entityframework.codeplex.com/workitem/2083

They changed the default null semantics from 5 to 6 so I'm guessing you had the same problem I did after upgrading. My machine had a fraction of the data as my remote installation and until I got to production I didn't know I had a performance issue. The queries will often produce a table scan which will time out for larger tables.

To change it back so that it works like EF5 you have to set:

DbContextConfiguration.UseDatabaseNullSemantics = true

See here: http://msdn.microsoft.com/en-us/library/system.data.entity.infrastructure.dbcontextconfiguration.usedatabasenullsemantics(v=vs.113).aspx

The bug was fixed in EF 6.1 but you still have to set the option above to get simple where conditions.

回答6:

I just had the same exact issue, i know this thread is a year old but maybe it will help someone else.

I was trying to create the database in entity 5 using the Package Manager Console using the connection string below.

update-database -ConfigurationTypeName My.Project.EF.Migrations.Configuration -ConnectionStringName MyDatabaseDev -ProjectName Project.Name -StartUpProjectName Database.Name

Each time i ran it i got the error below.

Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.

To fix it i simply added the -force parameter and it went right through.