Question

Which of the following statements is incorrect?

a. A key-value (KV) database is a NoSQL database model that stores data as a collection of key-value pairs in which the value component is unintelligible to the DBMS.
b. A document database is a NoSQL database model that stores data in key-value pairs in which the value component is composed of a tag-encoded document.
c. A column family database is a NoSQL database model that organizes data into key-value pairs, in which the value component is composed of a set of rows that vary by column.
d. A graph database is a NoSQL database model based on graph theory that stores data on relationship-rich data as a collection of nodes and edges.

Answer 1

The incorrect statement is a. A key-value database is a NoSQL model where the value component can be interpreted by the application, contradicting the claim that it is unintelligible to the DBMS.

Step-by-step explanation:

The incorrect statement among the options provided is: a. A key-value (KV) database is a NoSQL database model that stores data as a collection of key-value pairs in which the value component is unintelligible to the DBMS.

This statement is incorrect because in a key-value database, the value is not necessarily unintelligible to the DBMS; rather, it is simply a piece of data associated with a unique key, and how it is interpreted depends on the application using the database, not the database management system (DBMS) itself.

The other statements describe aspects of NoSQL databases correctly. A document database stores data in a format like JSON, XML, or BSON, where the value is indeed a document. Column family databases do organize data into columns and rows, and graph databases use nodes and edges to represent and store data. Therefore, these remain properly classified within their respective NoSQL database models.