Oracle/DB

Indian IT industry prefers B.Tech CSE/IT, MCA, BCA, B.Sc CS/IT graduates for technical roles. Therefore, you may face challenges in getting technical roles in IT companies. You are advised to do MCA for a meaningful IT career.

Oracle offers a complete, integrated set of application development tools that support any development approach, technology platform, or operating system. Oracle PL/SQL Developer Certified Associate is industry recognised certification which helps in career opportunities as application developers. You can also do Oracle Database Administration (DBA) certification also to take DBA career.
You can also do similar professional courses for DB2 and SQL servers also which are equally popular RDBMS.

If you are planning to be an application developer, you must do courses on both Oracle and .NET.

You are advised to do either hardware or software certifications along with BCA to enhance your employability, based on your interests and preferences.

You can join any of the following institutes:
SQL Star International Limited
e-gain.co.in
SEED Infotech Ltd., Mumbai
Core Database Systems

You can join any of the following institutes:
SQL Star International Limited
e-gain.co.in
SEED Infotech Ltd., Mumbai
Core Database Systems

I am of the opinion that DBA certification be done after few years of software development experience. You may have difficulty to start career after DBA certifications without experience.

Being a B.Com graduate with a Diploma in java, I expect a minimum of 10k per month. Assuming you have a very good knowledge in java, you can jump up to 40k in an year or so.