On occasion I get the following error when trying to synchronize from SQL Express to SQL Server using Sync Framework 2.1. Once a client gets this error they have to reinitialize the scope. There can't be anything wrong with the syntax like the error states because it runs no problem for long periods of time (with inserts happening). Any thoughts?
11:18:21 AM Failed to execute the command 'BulkInsertCommand' for table 'XXX'; the transaction was rolled back. Ensure that the command syntax is correct.
11:18:21 AM Microsoft.Synchronization
11:18:21 AM at Microsoft.Synchronization.Data.ChangeHandlerBase.CheckZombieTransaction(String commandName, String table, Exception ex)
From a trace log:
WARNING, OfflineAgentMonitor.vshost, 13, 04/05/2011 11:16:17:224, Bulk command BulkUpdateCommand failed with the following exception. Rows will be retried during single apply. System.Data.SqlClient.SqlException (0x80131904): Trying to pass a table-valued parameter with 19 column(s) where the corresponding user-defined table type requires 20 column(s).
try to enable Sync Fx tracing and check if Sync Fx logs the original exception. if i remember it right, the exception is normally raised when the db connection is lost. you should be able to retry the sync though without re-provisioning the scope.
This happened to me syncing between 2 SQL Azure databases. The initial cause was that the slave DB grew larger than it's provisioned size. I increased the size, but it was a good 20 minutes before the sync stopped throwing the error
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I'm running into an issue with an application I'm working on. Here is a breakdown of what is happening.
Create new database via code (succeeds)
Connect to newly created database and create tables (succeeds too)
Inserting data into previously created tables (this fails with an exception)
Show error message to the user
Open a new connection on the master database
Delete database created in step 1
Step 6 fails due to a:
System.Data.SqlClient.SqlException: Cannot drop database "ImportFail" because it is currently in use.
The error message kinda makes sense if you have unclosed connections or use a connection on the database you want to drop but from what I can see that is not the case.
I went into SQL Server Management Studio and looked at what is blocking the drop statement. Spid 52 seems to be blocked by 53. 53 however is the DDL statement that is creating the database in step 1 - which undoubtedly succeeds.
The creation of the database and the subsequent insert statements (or any SqlCommand in our codebase) is going through the following method. I can't see why any connection would be lingering around here even in case of an exception.
Add SqlConnection.ClearAllPools(); after the exception. This static method will physically close and remove pooled connections holding a shared lock due on the database that prevents the database from being dropped.
Note that closing/disposing connections only returns the connection to the pool and is not enough alone.
My C# application is currently throwing lots of the below exceptions:
Timeout expired. The timeout period elapsed prior to completion of
the operation or the server is not responding. This failure occurred
while attempting to connect to the routing destination.
I am using linq queries and NHibernate.
I am having difficulty troubleshooting this as the exception does not occur every time the query is ran. If I take the query and run it directly on SSMS it seems to run very quickly.
The timeout exceptions only appear to occur when ran against one table in the database.
I know I am able to increase the query timeout but I would like to resolve the root cause of the issue. I have a limited knowledge in troubleshooting these issues so what are the next steps I need to take to determine what the problem is?
Increase 'Connect Timeout' of your connection string. 60 is a good number.
I have a very simple LINQ query where I call a view to get an object, basically it looks like this:
context.view.FirstOrDefault(p => p.id == key)
Key and id are strings, which is less than ideal I think. However, when I run it against my local database, it works fine.
However, when I deploy my application, I get the message:
[Win32Exception (0x80004005): The wait operation timed out]
[SqlException (0x80131904): Timeout expired. The timeout period elapsed prior to
completion of the operation or the server is not responding.]
etc.
Other queries against views work quickly and as expected. They return lists rather than single objects, I'm not sure if that makes a difference.
I'm unable to connect to my hosted database from my development environment due to how the environment is configured, so my troubleshooting options are somewhat limited. I have double checked that the view is the same across both the local and the hosted environment.
When I run the query in SSMS against the hosted database it executes in under a second.
I'm not sure what good next steps would be as far as troubleshooting and would appreciate any advice.
I'm using Entity Framework 6, database first.
Those were great suggestions from Diana and William. Unfortunately, I didn't have permission to view query plans in the hosted database.
After simplifying the result returned by the view on the hosted database, I determined that it was in fact slowness in querying the view that was the root of the issue. While the query itself is simple, the view is pretty complex. I'm going to see if I can get the requisite permissions on the database to make an indexed view.
Two days ago, with no code changes or changes to the DB, I am not getting a lot (every 5 minutes or so) of errors with The wait operation timed out error with two different underlining full errors on about the pre-login and the other about the post:
System.Data.Entity.Core.EntityException: The underlying provider failed on Open. ---> System.Data.SqlClient.SqlException: Connection Timeout Expired. The timeout period elapsed while attempting to consume the pre-login handshake acknowledgement. This could be because the pre-login handshake failed or the server was unable to respond back in time. The duration spent while attempting to connect to this server was - [Pre-Login] initialization=21; handshake=14988; ---> System.ComponentModel.Win32Exception: The wait operation timed out
System.Data.Entity.Core.EntityException: The underlying provider failed on Open. ---> System.Data.SqlClient.SqlException: Connection Timeout Expired. The timeout period elapsed during the post-login phase. The connection could have timed out while waiting for server to complete the login process and respond; Or it could have timed out while attempting to create multiple active connections. This failure occurred while attempting to connect to the routing destination. The duration spent while attempting to connect to the original server was - [Pre-Login] initialization=5; handshake=3098; [Login] initialization=0; authentication=0; [Post-Login] complete=7; The duration spent while attempting to connect to this server was - [Pre-Login] initialization=20; handshake=5; [Login] initialization=0; authentication=0; [Post-Login] complete=11003; ---> System.ComponentModel.Win32Exception: The wait operation timed out
I am using Entity Framework and my web site is hosted on an Azure Web App. I have done some digging and most SO questions I find about this are NOT related to Entity Framework but ADO.Net the few posts I found lead me updated from a Basic to Standard (S0) service for the DB and creating a GlobalDBConfig with
public class GlobalDBConfig : DbConfiguration
{
public GlobalDBConfig()
{
SetExecutionStrategy("System.Data.SqlClient", () => new SqlAzureExecutionStrategy(2, TimeSpan.FromSeconds(30)));
}
}
How can I figure out what else is going wrong and fix it? This is a very simple DB with simple queries and very little traffic to the site (less then 1000 visits a DAY)
We resolved this issue, along with other types of random timeouts on SQL Azure by switching to "contained users". Using server-level logins on SQL Azure can cause issues:
This is not very efficient as in SQL DB master and user can sit on
two different SQL servers potentially in two different machines. Also
when a server has multiple user databases then master will be the
bottleneck in the login process, and under load this may result in
high response time for logins. If Microsoft is updating the software
on the machine / server then master will be unavailable for a few
seconds and all the logins to the user database can fail too at this
time (http://www.sqlindepth.com/contained-users-in-sql-azure-db-v12/)
As in your case, I had my doubts because my database was not under heavy load, but switching to contained users made a tremendous difference anyway.
The SQL to create these users is as follows (run this on the database itself, not on the master database as you would for creating server-level logins):
Create user ContainedUser with password = 'Password'
ALTER AUTHORIZATION ON SCHEMA::[db_owner] TO [ContainedUser]
ALTER ROLE [db_owner] ADD MEMBER [ContainedUser]
Here are a few options to try: I strongly recommend going with (1) and (3) if possible
User database firewall rules and contained user authentication
Increase connection timeout to a large value (60-120 seconds?)
If possible update your client drivers to latest version (7.4 and above)
We had similar problems and please note that there is no such thing as AUTO scaling on standalone databases on Azure and since you are using Entity Framework, here are some suggestions below
If you are calling Web-API to fetch and transact with your database on Azure SQL, make sure on Azure portal you set the "ALLWAYS ON" option for the Web-API.
Then your client app should probably retry if it fails to connect in the first attempt.
If the database queries are resulting in timeouts due to volume of the data and the indexes not able to catch up with that, you will need to increase the time out of the command executions a bit and most importantly you will need to update the stats on the database and recompile all the objects in the database.
In recent times, a particular page in my web app throws the
Exception Details: MySql.Data.MySqlClient.MySqlException: Timeout
expired. The timeout period elapsed prior to completion of the
operation or the server is not responding.
Though I use Ibtais as persistence layer, this error occurs. I have restarted the MySql service instance but stil i get the same error. It didn't happen earlier but happens frequently in recent times.
All the web applications deployed on the server uses Ibatis and the DB server remains on the same machine where IIS is installed. There are about 8000 records in which around 300 to 500 would be filtered on page load
Any insights for the cause of the problem?
I encountered the same problem with yours, and I found this MySQLConnection--Specifying default command timeout. Just add "default command timeout=xxx" into your connectString, this key's value is in seconds.
I tried and it worked for me.
You could set command timeout to 0, its not a good idea though. Some requests could go on indefinitely.
There is an underlying problem that is causing the queries to time out in the first place. Are you inserting, updating, or in any way working with large binary values that would lock the table? That is the most common reason I see for an error like this on such a small amount of data.
Make your connection string look like this:
DotNet Framework:
<add key="MYSQL_CONNECTION_STRING_RDS" value="Uid=userid;Password=pass;
Server=localhost;Port=3306;
Database=dbname;default command timeout=0;SslMode=none"
/>
DotNet Core
"MYSQL_CONNECTION_STRING_RDS": {
"ConnectionString": "Server=localhost;Database=dbname;user=userid;password=pass;default command timeout=0;",
"ServerVersion": "8.0.22"
}