Why below error comes?
System.Data.SqlClient.SqlException Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding
You should normally try to write fast sql (<100ms) otherwise your application will be sluggish for the end users.
If your server reply in time when you send the request manually,
There may be a read lock on a table and the second query keep on waiting for the read lock to end before processing.
In that case try to add WITH(NOLOCK) or WITH(READUNCOMMITTED) to your select statement.
Acccording to your situation and err msg, I think it may be caused by mainly two reasons:
Long running tasks：In default SQL Connection will wait for 30 seconds, but over this time, if you still cannot connect to the db, the kind of error will be thrown out.
For the second reason, that there might be an uncommitted transaction.
Of course, you should Close Connnection at a time when you don't want to use it (using…… statement is recommanded)
See more about this kind of issue, you can refer to:
http://blogs.msdn.com/b/spike/archive/2008/07/31/timeout-expired-the-timeout-period-elapsed-prior-to-completion-of-the-operation-or-the-server-is-not-responding.aspx
Related
When I attempt to delete a view in Serverless Pool Database from SSMS Version 18.4 I get the following error:
Lock request time out period exceeded Error:1222
Can someone let me know how to overcome this issue?
Lock request time out period exceeded Error:1222
A query waits longer than the lock timeout setting, as shown by the error message "lock request time out period exceeded" (error 1222). The lock timeout parameter controls the amount of time, in milliseconds, that a query must wait before returning an error on a blocked resource.
SELECT * FROM sys.dm_exec_sessions where open_transaction_count=1;
The above query obtains active transaction information for the current database using sys.dm_exec_sessions view.
Then kill that process using the following command.
Kill 129
Make sure that every BEGIN TRANSACTION contains a COMMIT command to avoid this.
The following will indicate success but leave transactions uncommitted:
BEGIN TRANSACTION
BEGIN TRANSACTION
--SQL_CODE?
COMMIT
Closing query windows with uncommitted transactions will prompt you to commit your transactions.
My procedure fails at times, and further investigation reveals that it is always the same error:
ORA-12801: error signaled in parallel query server P02U
ORA-04021: timeout occurred while waiting to lock object
ORA-06512: at "USP_ALGO_REPORT", line 645
I've tried several things (don't know if they are helpful or not), for instance, bringing down from parallel(16) to parallel(8) for all my select statements inside the procedure, changing the timings when the procedure is scheduled to run etc.
Please let me know If I can provide further information that can help understand the problem.
Thank you.
My procedure fails at times
Check error ORA-06512 in Docs.
Fix the problem causing the exception or write an exception handler for this condition on line 645.
Like:
if something
return 1
after performing DML statements, try to commit.
timeout occurred while waiting to lock object
at cases,this resolves the timeout issue.
committing the session releases the locking object can can be used for next command....
I am randomly getting execution timeout expired error using the Entity Framework (EF6). At the time of executing the below update command it gives randomly execution timeout error.
UPDATE [dbo].[EmployeeTable] SET [Name]=#0,[JoiningDate]=#1 WHERE
([EmpId]=#2)
The above update command is simple and it takes 2-5 seconds to update the EmployeeTable. But sometime the same update query takes 40-50 seconds and leads the error as
Execution Timeout Expired. The timeout period elapsed prior to
completion of the operation or the server is not responding. the
statement has been terminated
.
For that I updated my code inside constructor of MyApplicationContext class can be changed to include the following property
this.Database.CommandTimeout = 180;
The above command should resolve my timeout issue. But I can’t find out the root cause of that issue.
For my understanding this type of timeout issue can have three causes;
There's a deadlock somewhere
The database's statistics and/or query plan cache are incorrect
The query is too complex and needs to be tuned
Can you please tell me what the main root cause of that error is?
This query:
UPDATE [dbo].[EmployeeTable]
SET [Name] = #0,
[JoiningDate] = #1
WHERE ([EmpId]=#2);
Should not normally take 2 seconds. It is (presumably) updating a single row and that is not a 2-second operation, even on a pretty large table. Do you have an index on EmployeeTable(EmpId)? If not, that would explain the 2 seconds as well as the potential for deadlock.
If you do have an index, this perhaps something else is going on. One place to look is for any triggers on the table.
If it's random, maybe something else is accessing the database while your application is updating rows.
We got the same exact issue. In our case, the root cause was BO reports being run on the production database. These reports were locking rows and causing timeouts in our applications (randomly since these reports were executed on demand).
Other things that you might want to check:
Do you have complex triggers on your table ?
Does all foreign keys used in your table are indexed in the foreign tables ?
I have one stored procedure in SQl Azure is calling periodically at 5 minutes and processing crore of data and it sometimes give Timeout error as per below as per my log.
Timeout expired. The timeout period elapsed prior to completion of
the operation or the server is not responding.
How can i increase Timeout of this query or whole Db? and what would be default Timeout?
Update
I think Time out is not due to connection to sql azure here as per answers of #Ming and #Ruchit because when i have checked the log then below error it will display message like
Warning: Null value is eliminated by an aggregate or other SET
operation.
It means query is being executed, above message because of i have used some aggregate function on NULL value. Am i thinking correct? what should be other possible cause?
Thanks in Advance.
According to http://social.msdn.microsoft.com/Forums/en-US/ssdsgetstarted/thread/7070c2f9-07d1-4935-82c2-b74a196908ee/, SQL Azure will close idle connections that are longer than 5 minutes. As you mentioned you’re calling the stored procedure every 5 minutes, thus you may be on the edge of timeout. I would like to suggest you to change to every 4 minutes to see whether it works.
In addition, when using SQL Azure, retry is very important. When a query fails, please close the connection, wait for a few seconds, and then create a new connection, try the query again. Usually the second time will work fine.
Best Regards,
Ming Xu.
Ming Xu is right. the cause of the error is most probably the 5 minute timeout.
If you can not change the time period to call the stored procedure, one option is to make dummy call to SQL Azure every 3 or 4 mins. This will keep the connection from being closed.
I have written a stored procedure which retrieves more than 7000 rows. While executing the stored procedure in my VB.NET winforms application, I'm getting an error like as follows.
Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
I googled and tried like using these lines of codes which wasn't useful.
sqlCmd.CommandTimeout = 0
sqlCmd = New SqlCommand("waitfor delay '00:00:60'")
Please help me with this.
There are multiple places you can be experiencing a timeout. Some things to try.
Run the stored procedure with the exact same parameters in Sql Management Studio. How many seconds does it take? This will give you an idea of how long you need your timeout to be. If it takes more than 30-60 seconds, consider revising your sql, added indexes and otherwise tune your database.
CommandTimeout - This is the timeout for your particular command. You should avoid setting it to 0, although this may work, http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.commandtimeout.aspx
ConnectionTimeout - This is the timeout property for your entire connection. If this is less then your CommandTimeout it will override. Again, 0 should be avoided here. http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.connectiontimeout.aspx
You should increase the commandTimeOut and not put it 0.
Try to put the value 60, which means 1 minute.
It is not advisable to set your timeout to 0. The remaining answer would be only to increase the limit BUT..
Increasing the timeout is like a band-aid solution. What if you have a longer query? Will you just increase the timeout again?
To solve this, please refer to my answer here..
Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding