CA Gen model/subset download gives SQLCODE = -904 unavailable resource, REASON = ​​​​​​​00C90080 

Document ID : KB000129632
Last Modified Date : 19/03/2019
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Issue:
Get SQLCODE = -904 unavailable resource, REASON = 00C90080 when trying to download a CA Gen model or a specific subset.  The problem appears for all models and users.
Environment:
CA Gen z/OS
Resolution:
Restart the DB2 database resource with READ/WRITE access.

Db2 for z/OS 11.0.0 > Db2 codes > Db2 reason codes > X'C9......' codes: 
https://www.ibm.com/support/knowledgecenter/en/SSEPEK_11.0.0/codes/src/tpc/00c90080.html

00C90080
Explanation 
An attempt was made to allocate a resource for update operations. However, the resource was already started for read-only access. 

System action 
The allocation process is not allowed.

Operator response 
If this reason code appears in message DSNT501I, determine whether the named resource should be started for read-only access. 

User response 
Determine when the resource is started for read/write access, and rerun the job.