Which of the following options is defined as the tendency to change the internal schema without affecting the conceptual schema?

Which of the following levels of a data storage virtualization technology involves block-level striping with distributed parity?

Which one of the given options is not a component of a storage manager in a database management system?

A database table must have only one primary key and one super key.

Which attributes is represented by the entity-relationship (E-R) diagram given in the image?

Suppose there are two relations: R1 and R2. If C1 and C2 are the selection conditions, and A1 and A2 are the attributes of the relation R1, then which of the given query transformations are correct? 1. 0C1 (0C1 (R1)) -> 0C2 (0C2 (R1)) 2. 0C1 (nA1 (R1)) -> nAl (0C1 (R1)) 3. 0C1 (R1 U R2) -> 0C1 (R1) U 0C1 (R2)

________ involves standardizing the format of data retrieved from different systems.

____ yields better performance.

Which of the following statements about normal forms is/are true?

Consider the schema R = (ABCD) and the functional dependencies A -> B, B -> C, C -> D and D -> A. Let R = (R1 and R2) be a decomposition, such that R1 {'1 R2 = cp. The decomposition is in .

Restriction of_ from the basic relational model has been removed in the nested relational model.