PowerExchange now uses IMS command code A to improve the performance of PowerCenter sessions that write to IMS 11 and later target databases that use ODBA, BMP, or DL/I batch access. The use of command code A also reduces overhead and CPU usage on the IMS system. This change applies to PowerCenter bulk and CDC sessions that use a PWX NRDB Batch application connection to connect to an IMS target. For this feature to function properly, you must apply the APARs that are documented for your IMS version in the "Installation Planning" chapter of the
PowerExchange 10.2 Installation and Upgrade Guide
.
Prior to this change, when the session ran, IMS wrote a checkpoint after every commit for an Update, lookup, or other operation that required IMS to reset its position to the beginning of the database. Also, the session ignored the
Commit Interval
session property. The excessive checkpointing degraded performance and increased resource usage.