DC390003 INSUFFICIENT REGION SIZE, STARTUP ABORTED or DC390001 and U3994

Products

• IDMS
• IDMS - Database

Issue/Introduction

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.

Environment

Release: All supported releases.

Cause

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.

Resolution

To resolve the problem, check the following:

• The REGION parameter in the EXEC or JOB card may be too small, try increasing it.
• The FREESTG parameter in the PARM statement may be too high, try reducing it.  When modifying the FREESTG parm, reduce it gradually until the CV comes up. Too small a value can cause problems with storage fragmentation later on. 
• The storage pools or program pools in the SYSGEN may be too high, try reducing these in the SYSTEM statement. See Sizing 24-bit storage pools.
• The XA storage pools may be too high in the SYSGEN, try reducing them.
• The CV may be picking up a mixture of IDMS modules from different releases, check the CDMSLIB, STEPLIB and LINKLIST datasets point to the correct release loadlib.
• Changes may have been made to the SYSGEN and not generated successfully, regenerate the system.