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POALTER TABLE NOCHECK CONSTRAINT timeout randomly
 

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  1. POALTER TABLE NOCHECK CONSTRAINT timeout randomly
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    <p>I have an C# application that performance ETL process. For self referencing table, the application will run "ALTER TABLE [tableName] NOCHECK CONSTRAINT [constraintName]" which turns off any FK constraint(s ) check of this table. Once all the data is loaded, the constraint(s) are enable again.</p> <p>The database time out is set to 3 minutes, however, the above SQL command would fail because of database would timeout in 30 sec.</p> <p>What could be the cause of this timeout?</p> <p>Are there database system tables I should check for abnormality?</p> <p>Other information: I checked the app, it only has one active thread doing the ETL, so I don't think the application locks any database resource. In addition, the database runs on the same machine as the application.</p> <p>Event the application closes all its database connections, it would timeout again if it runs ETL process the next time. If I run the sql manually using SQL Manager Studio, it has no problem at all.</p> <p>Thanks</p> <p>UPDATE - The application is turning off a number of constraints. It turns out the time out only happens to 1 particular constraint. This constraint is referencing to the Date Dimension table.</p> <p>UPDATE - It looks like there is some weird abnormality for the testing database that I was working. I tried the same ETL process with other data warehouse and it has no problem so far. Other developers in the team also haven't encounter this issue. This application runs on every midnight. I will keep it running overnight and hopefully I can reproduce the same issue on other databases. So far no luck on figuring out what is going on.</p>
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    1. COYou mention 'The database time out is set to 3 minutes...' where are you doing this setting? It appears from your question that the default time out of 30 secs is still the case.
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      1. USJulius A
    2. COI would have thought the cause would be blocking despite the fact that you think that there are no other connections in play. I would imagine that this would be a quick metadata change so the only scope for delay would be waiting for the `Sch-M` lock.
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      1. USMartin Smith
 

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