Hi,
I hv a CICS program that reads a VSAM control file(say FILE1) for a sequence #. This (SEQ # + 1) is my key for another file(say FILE2) and this same (seq # + 1) is also updated in the VSAM control file FILE1 for the next tasks. Iam doing a READ with UPDATE option on the vsam CONTROL FILE FILE1 and then doing a SYNCPOINT after the REWRITE of FILE1.

In spite of this, another task seems to have fetched the same sequence # thereby resulting in DUPREC when file 2 is being written.

How can I avoid this concurrent reading / deadlock?

Thanks

It may help if you post the relevant code - not the entire program, just the bits that deal with this control info.

How is the vsam file defined?