Which of the following inference rules for functional dependencies are correct?

1. |fA> BandA>C,thenA> BC

2. lfA>BC,thenA>BandA>C

3. |fA> B and DB>C,then DA>C

4.lfA>BandC>D.thenAC>BD

Which of the following statements is incorrect?

Which of the following RAID levels is widely used to store log f‌iles in a database system?

Which of the following statements correctly describes a transitive dependency?

What do you mean by backflushing in the construction of a data warehouse?

Data dictionary can be used for which of the following options? 1. For f‌inding the location of the data. 2. For f‌inding the size of the storage disk. 3. For f‌inding the owner of the data.

________ problems are encountered when removing data with transitive dependencies.

________ tools and techniques process data and do statistical analysis for insight and discovery.

1nf, 2nf, and 3nf are ____.

A(n) ____ is the equivalent of a field in a file system.

To normalize a data structure, you apply the ______________________ in sequence.