certifications

Selling these books that I bought for the CISSP preparation. Have read just 10 pages so they are practically brand new. Realized that I am no longer capable of reading physical books. Completely skipped these physical books for my preparation. The 10th edition which has minor changes retails...

I'm looking forward to do the mentioned certifications. Which one of the paired ones should I do? For databases - which one? Oracle Database 12c (1z0-071) or MongoDb Developer Certificate offered by MongoDb university? For Java related certificate - which one? OCAJP Java SE 8 Programmer or...