Description:
How does Database Organizer (DBO) allocate Database DD statements from JCL, DBRC RECON datasets and Dynamic Allocation Library (MDALIB)?
Solution:
The following conditions apply for DBO to select the Database DD statement(s) either from the JCL, or from DBRC RECON, or from IMS MDALIB:
1. DD statement always will be used from JCL if it is coded here - (neither DBRC nor MDALIB will be checked) 2. DD statement will be used from DBRC - if NOT coded in the JCL AND - if option DBRC=Y is used AND - if DD statement is defined in the RECON dataset 3. DD statement will be used from MDALIB - if NOT present in the JCL AND - if MDA member is present in the MDALIB AND - if option DBRC=Y, but DD statement NOT in RECON OR - if option DBRC=N and DBALLOC=Y
The job abends with database allocation error in all other cases.