Big data

Why is column-oriented storage potentially advantageous in a database system that supports a data warehouse?

What is PageRank?

Explain the difference between the three storage types—volatile, non-

volatile, and stable—in terms of I/O cost.

How might a distributed database designed for a local-area network differ from one designed for a wide-area network? 

Explain the phantom phenomenon. Why may this phenomenon lead to an incorrect concurrent execution despite the use of the two-phase locking protocol?

Explain why the allocation of records to blocks affects database-system performance significantly.

What's the Relational DB ?