I think it is a good feature choosing a database-variant to master. Work enough in the field. Relational databases are mostly the backbone of many applications.
If you are familiar with SQL Server, Oracle quite alike and yet different in its internals, tuning, handling,dialect...
Where SQL Server administration is becoming easier but broader, Oracle doesn't come with easy administration tools unless you pay the big bucks.
Goal of a database is usually consistency match with quick retrieval/writes with small datasets (OLTP).
Datawarehouse are more oriented on quick retrieval of large datasets and on the fly analysis of aggregated data.
There is quite a difference between sql-set-based thinking (like moving boxes with books instead of moving each book indivually) opposed to the object-oriented approach of java.
If you have a background of java, you have a plus as the oracle-stack (database,webserver,...) is more java-minded.
Not sure if it is better than java, any good programmer is also worth his/her weigth in gold.