Which of the following is/are correct? Select one or more: O a. Columns are grou

Question

Which of the following is/are correct? Select one or more: O a. Columns are grouped into column families, and columns within a column family can be dynamically changed O b. Columns are the basic units of distribution and load balancing c. Tablets are the basic units of access control. O d. The choice of row-keys affects partitioning of rows into tablets. O e. Column families within a (big) table can be dynamically created (i.e., no need to predefine a column family before data is stored under any column key in that family). Which of the following about JOIN operations is/are correct? Select one or more: O a. The JOIN operations are essential for developing efficient autosharding technologies. O b. The lack of JOIN operations in a NoSQL database could lead to data redundancy and data inconsistency c. The JOIN operations have been added in the first generation for NoSQL but deprecated. d. The JOIN operations are not common in NoSQL databases because they could make the query processing sloW.

Explanation / Answer

As per your problem

1-a,b

2-c,d

3-d

4-c

5-a

As per your problem following options are true

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