The IDMS CV startup can fail with error message DC390003 INSUFFICIENT REGION SIZE, STARTUP ABORTED and abend code U3994.
Depending on what stage of the startup the error occurs, CV may instead get error message DC390001 INSUFFICIENT REGION DETECTED AT STARTUP. This can happen after upgrading IDMS to a new release or after making SYSGEN changes.
Release: All supported releases.
The problem is caused by IDMS being unable to obtain enough storage. It is is most likely due to insufficient storage below the line but it could also be due to insufficient XA storage.
If the DC390003 message and 3994 abend are the first messages in the CV joblog, then there is no storage problem and the abend is being issued in error. For the solution in this case, see S0D3 or DC390003 3994 abend at CV startup.
To resolve the problem, check the following: