Oracle/DB

Both the certifications are more of the technical side. If you have no interest in MCA, then maybe it is difficult for you to understand them better. MCA is not really required for networking certification.

Database Developers are responsible for planning, managing and maintaining database management systems. If you do any of computer science or IT graduation degree such as B.Tech, BCA, MCA etc, you will able to get skills to be a database developer as part of degree syllabus in RDBMS courses. There are multiple computer education/ training institutes which offer courses on database development. Once you have basic knowledge after undergoing course, it is advised that for a good career as Database developer, you can work to get certification such as: Oracle Certified Associate: PL/SQL Developer.

Please refer to below link
https://www.shiksha.com/search/?q=Oracle+/+DB&c=10&sc=106&sa=10224^^0^0^0^0^0&ts=1220611&rf=searchwidget&ct[]=10224

Dayanand sagar institute.

If are technically oriented then MCA is a better option in comparison to MBA.

Yes you can learn oracle. You need to be a graduate to get into oracle course in a good institution. All the best.

dese are vry big compaines. so its important that u get an admission in good college like iits or nits so u will hv sure chance to atleast appear in all of then. rest in clg apart frm curriculum focus most on algorithms. they are the base of evry thng