A DBOC CLOSE is successfully issued on a CICS URT. A DBOC INQ confirms that it is closed but a console (or DBUTLTY) ACCESS command shows that the CICS region has still the database open:
DB01311I - ACCESS OFF,nnn
DB00607I - BASE nnn ACCESS OFF ACTIVE JOB(S) CICSxxx
Release : 15.1
Component : CA DATACOM/DB
In this case, CICS SQL plans with PLNCLOSE=R keep the database open even if the standard CICS URT is closed. See PLNCLOSE topics on "CA Datacom/DB SQL Preprocessor Options"
Additional documentation about this topic: