I have many users on my web site (20000-60000 per day), which is a download site for mobile files. I have remote access to my server (windows server 2008-R2).
I've received "Server is unavailable" errors before, but I am now seeing a connection timeout error.
I'm not familiar with this - why does it occur and how can I fix it?
Server Error in '/' Application. Timeout expired. The timeout periodelapsed prior to completion of the operation or the server is notresponding. The statement has been terminated. Description: Anunhandled exception occurred during the execution of the current webrequest. Please review the stack trace for more information about theerror and where it originated in the code.
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Exception Details: System.Data.SqlClient.SqlException: Timeoutexpired. The timeout period elapsed prior to completion of theoperation or the server is not responding. The statement has beenterminated.
An unhandled exception was generated during the execution of thecurrent web request. Information regarding the origin and location ofthe exception can be identified using the exception stack trace below.
[HttpException (0x80004005): Timeout expired. The timeout periodelapsed prior to completion of the operation or the server is notresponding. The statement has been terminated.]
System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContextcontext, HttpApplication app) +4052053
System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtrappContext, HttpContext context, MethodInfo[] handlers) +191
System.Web.HttpApplication.InitSpecial(HttpApplicationState state,MethodInfo[] handlers, IntPtr appContext, HttpContext context) +352
System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtrappContext, HttpContext context) +407
System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtrappContext) +375
A deadlock can be difficult to fix, but it's easy to determine whether that is the case. Connect to your database with Sql Server Management Studio. In the left pane right-click on the server node and select Activity Monitor. Take a look at the running processes.Normally most will be idle or running. When the problem occurs you can identify any blocked process by the process state. If you right-click on the process and select details it'll show you the last query executed by the process.
You should not do this when your server is under heavy load because it will temporarily incur a big performace hit as all stored procs and queries are recompiled when first executed. However, since you state the issue occurs sometimes, and the stack trace indicates your application is starting up, I think you're running a query that is only run on occasionally. You may be better off by forcing SQL Server not to reuse a previous query plan. See this answer for details on how to do that.
I've already touched on the third issue, but you can easily determine whether the query needs tuning by executing the query manually, for example using Sql Server Management Studio. If the query takes too long to complete, even after resetting the statistics you'll probably need to tune it. For help with that, you should post the exact query in a new question.
Maybe it will be useful for somebody.I faced with the same problem and in my case the reason was the SqlConnection was opened and not disposed in the method that I called in loop with about 2500 iterations. Connection pool was exhausted. Proper disposing solved the problem.
When the retry-algorithm is used, the data provider waits for the first read (SniReadSync) call to finish. The call is sent to the back-end computer that is running SQL Server, and the waiting time is calculated by multiplying the connection time-out value by 0.08. However, the data provider incorrectly sets a connection to a doomed state if a response is slow and if the first SniReadSync call is not completed before the waiting time expires.
I faced same problem worked on it around 3 days. I noticed as our number of records are not much our senior developer keeps 2 images and Fingerprint in database. When I try to fetch this hex values it taking long time, I calculate average time to execute my procedure its around 38 seconds. The default commandtimeout is 30 seconds so its less than average time required to run my stored procedure. I set my commandtimeout like below
@SilverLight.. This is clearly an issue with a Database object. It can be a badly written query, or missing indexes. But as of now I won't suggest you to increase the timeout without investigating the issue with your Database objects
In my case I used EntityFrameworkCore.
Since the input I wanted to be processed exceeded the query limit this error came to me.
The solution for my case was to split the data processing into chunks and by this approach I was able to fit within the limits.
Yes, it takes time, but at least it processes all of the input records.
We've had hard times on Timeout expired/max pool reached Sqlexception. As a workarround and to prevent restarting the server or the service we modify the MAX SERVER MEMORY variable in SQL Server (either through SQL Managment Studio or T-SQL):
We recently upgraded to the NuGet version of SqlClient (Microsoft.Data.SqlClient) which contains a bug. This bug was introduced during the lifetime of the 1.x cycle and has already been fixed. The fix will be available in the 2.0.0 release which is not available at the time of this writing. A preview is available.
Obviously you can increase CommandTimeout to solve this issue but before doing that you must optimize your query by adding index. If you run your query in Sql server management studio including actual execution plan then Sql server management studio will suggest you proper index. Most of the case you will get rid of timeout issue if you can optimize your query.
As others have said, the problem might be related with a pending transaction.In my case I had to send the DbTransaction variable as a parameter in the ExecuteScalar method for the procedure to be executed properly.
i got same error on my multithreading program that has over 2000 user connected simultansely. the problem happened when i run an SELECT command with more than 5000 rows. this command blocked by insert command. by changeing SELECT * to SELECT Top(n) * that n
session.gc_maxlifetime
session.gc_maxlifetime specifies the number of seconds after which data will be seen as 'garbage' and cleaned up. Garbage collection occurs during session start.
But the garbage collector is only started with a probability of session.gc_probability divided by session.gc_divisor. And using the default values for those options (1 and 100 respectively), the chance is only at 1%.
Well, you could simply adjust these values so that the garbage collector is started more often. But when the garbage collector is started, it will check the validity for every registered session. And that is cost-intensive.
Furthermore, when using PHP's default session.save_handler files, the session data is stored in files in a path specified in session.save_path. With that session handler, the age of the session data is calculated on the file's last modification date and not the last access date:
Note: If you are using the default file-based session handler, your filesystem must keep track of access times (atime). Windows FAT does not so you will have to come up with another way to handle garbage collecting your session if you are stuck with a FAT filesystem or any other filesystem where atime tracking is not available. Since PHP 4.2.3 it has used mtime (modified date) instead of atime. So, you won't have problems with filesystems where atime tracking is not available.
Every time when the user visits your site or service again you should invoke this function to check if its return value is TRUE. If it's FALSE the user has expired and the session will be destroyed (Note: This function uses a database class to connect and query the database, of course you could also do it inside your function or something like that):
On debian (based) systems, changing session.gc_maxlifetime at runtime has no real effect. Debian disables PHP's own garbage collector by setting session.gc_probability=0. Instead it has a cronjob running every 30 minutes (see /etc/cron.d/php5) that cleans up old sessions. This cronjob basically looks into your php.ini and uses the value of session.gc_maxlifetime there to decide which sessions to clean (see /usr/lib/php5/maxlifetime). [...]
It is very common in the IT certification test world to cheat in various ways. The most common is that people take the exam and memorize the questions they saw. The questions are then compiled and published. Some have tried to have someone else take the exam for them, but the testing companies have done a lot of work to make that hard (multiple IDs required to take the test). The testing companies require you to go to a testing center and you take nothing in to your exam with you and you under video surveillance the whole time.
Certification tests typically pull the questions for a given exam from a pool of questions. A normal test is maybe 50 questions from a pool of 200 questions. If you memorize the answers to all 200 questions you can pass the test without really knowing the subject.
There was a news crew on site doing a story on this the day I took my series 7 exam. A bunch of people were arrested for this exact scam. They made a business out of taking securities exams for other people.
I hate the high stales testing / certification bloat that often has little bearing on actual performance, just ability to take tests. But i agree the ethical violation of cheating would make me think that person should not be in a position of trust/authority!
I haaaate these testing situations so much! I remember this from when I took the GRE quite a few years back. I have dysgraphia and some minor motor control and working memory issues, so I am going to need a special pencil (I need a cushion to make it a little bigger so I have more control) and probably more scratch paper than most people will since I both write bigger AND need to write more stuff down to compensate for the memory stuff. (I also probably need to wear a hat with a brim to block overhead light glare.) 152ee80cbc
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