CICS® write operations to ESDS are single threaded, for both RLS and non-RLS mode access. However, the lock held for serialization can be held for slightly longer for RLS-mode access compared with non-RLS mode. You can compensate for the possible increase in overhead by increasing the task priority of those transactions that add new records to ESDS files. It is possible that when you switch an ESDS RLS mode from non-RLS mode that you might see an increase in time-outs for those transactions that add new records.
Using RLS mode access for an ESDS can also cause availability problems. If a CICS region fails while writing to an ESDS, the data set might be locked until the CICS region is restarted. It is recommended that you do not use RLS mode access for ESDS.
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