InfyTQ Introduction to DBMS Quiz 4

Correct order of the available database schemas-

Physical Schema→ Logical Schema → Conceptual Schema

Database environment is also known as  Database Instance. a database instance describes a complete database environment and all of its components.

The Process of modifying the database schema in lower level without affecting the schema in higher level is called as Data Independence.

Data independence is the type of data transparency that matters for a centralized DBMS.

There are two levels of data independence, they are Physical data independence and Logical data independence.

Logical data independence is the ability to modify the logical schema without causing application programs to be rewritten. Modifications at the logical level are necessary whenever the logical structure of the database is altered.

In a relational database, a tuple is one record (one row).

Field is the lowest level which contains one type of information and combination of fields related to one identity or entity is called record

The table is a relation because it stores the relation between data in its column-row format. The columns are the table's attributes, and the rows represent the data records.

Structural does not describe a database structure used by a DBMS to link data from several files