There are also some products on the market that allow you to update online files from batch. The ones I've seen work by redirecting the I/O request from the batch program and to CICS. On CICS there is a service or mirror transaction that actually performs the I/O. Some of these products work without any change to a batch program. I've seen this work successfully in my shop for many years. However, you still have to be careful about a batch program overwhelming CICS or holding file locks that delay online transactions.
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