These are Oracle Database Prerequisites and tables created while installing and configuring DRM,
Usually the DRM_DB user is created in the RDBMS (if it does not already exist). The DRM_DB user is assigned a default tablespace of DRM_DATA and must have access rights to the following items:
Default tablespace (usually DRM_DATA)
CREATE ANY SEQUENCE
and similar level of access for all other tables.
I hope thats clear please revert in case of more questions.
Below replies to your quereies-
Is this normal to have these files created in File system . - Yes thats normal behaviour but when our DRM communicates it look into database.
I believe we should get this Tables space created in Oracle DB not in Drives . - This should be created in Database in the schema which is used while configuring DRM.
Please let us know if need more clarifications.