I would think asking this question on the IDUG DB2-L list would be the best bet. However a few comments.
1. STRNO specified in the VSAM Catalog may not be in use. I could be over- ridden at open time. 2. The number of concurrent physical I/O's to a DB2 object needs to be limited espically for reads, this insures that only one copy of a CI is in the pool at a time. 3. DB2 whenever possible does async I/O that is applications expect to find the required data in the buffers with out I/O waits. The method for doing this is called 'PREFETCH' on the read side and 'DEFERED I/O' on the write side. 4. DB2 has a limited number of prefetch and write engines, usually far fewer than the total number of objects. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
