sql server query running slow from java

Question

I have a java program that runs a bunch of queries against an sql server database. The first of these, which queries against a view returns about 750k records. I can run t

Answer 1

Quote from the MS Adaptive buffer guidelines:

Avoid using the connection string property selectMethod=cursor to allow the application to process a very large result set. The adaptive buffering feature allows applications to process very large forward-only, read-only result sets without using a server cursor. Note that when you set selectMethod=cursor, all forward-only, read-only result sets produced by that connection are impacted. In other words, if your application routinely processes short result sets with a few rows, creating, reading, and closing a server cursor for each result set will use more resources on both client-side and server-side than is the case where the selectMethod is not set to cursor.

And

There are some cases where using selectMethod=cursor instead of responseBuffering=adaptive would be more beneficial, such as:

• If your application processes a forward-only, read-only result set slowly, such as reading each row after some user input, using selectMethod=cursor instead of responseBuffering=adaptive might help reduce resource usage by SQL Server.

• If your application processes two or more forward-only, read-only result sets at the same time on the same connection, using selectMethod=cursor instead of responseBuffering=adaptive might help reduce the memory required by the driver while processing these result sets.

In both cases, you need to consider the overhead of creating, reading, and closing the server cursors.

See more: http://technet.microsoft.com/en-us/library/bb879937.aspx