Свеженький баг, правда, не очень серьезный :)

Slow onchecks in 9.40 and 10.0

If you've noticed oncheck taking a long time to complete in IDS 9.40 and 10.0 you could be running into a known problem with missing read aheads. The defect, which has yet to be assigned an external APAR number, has the following description:
The problem manifests as oncheck running normally immediately after bringing the engine up, but if executed when IDS has been online for some time oncheck no longer uses read-ahead and starts running slowly.
This problem is fixed in IDS 9.40.xC8W3 and 10.00.xC5W1 or later.
Note: A 'W' release represents a Post Interim Drop or PID containing bug fixes checked into the code line since the last interim release. There are typically 5 PIDs between two interim releases like (for example) UC8 and UC9.