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Will too many data paths cause poor performance?

EXPERT RESPONSE FROM: John Brandt

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QUESTION POSED ON: 24 May 2001
We have one particular batch job on our system which runs with very poor performance. On examination the job has 2000+ open data paths mostly over the same files. Would this be causing the performance problems? If so, how can I cause data paths to be reused?

I'm certain that having 2000+ open data paths is causing the problem. The job was probably written to handle multiple calls to the same program recursively. If the calls are not recursive, then the program that is being called is not closing the file properly. If this is the case, and it is being called by a CL, you can use the RCLRSC *CALLER to close the path. I would start by researching the job looking at the programs that are using the file.

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