CPA NOsql Exam Questions With Verified
And Updated Answers
What is semi-structured data? - answer✔"Data whose schema changes often, such as JSON and
XML."
Why is the relational model's requirement of atomic data types sometimes overkill? -
answer✔Because applications may require storage of complex data which can be simpler
without normalization.
What are common uses of semi-structured data? - answer✔Data exchange between
applications or between back-end and front-end of an application.
What are two widely used semi-structured data models? - answer✔JSON and XML.
What is a key feature of semi-structured data models? - answer✔Flexible schema that allows
each tuple to have a different set of attributes.
What are multi-valued data types? - answer✔"Data types such as sets, multisets, key-value
maps, and arrays."
What is a key-value map? - answer✔"A set of key-value pairs, e.g., {(brand, Apple), (ID,
MacBook Air), (size, 13), (color, silver)}."
What operations are supported by key-value maps? - answer✔"put(key, value), get(key),
delete(key)."
What is an array database? - answer✔A database that provides specialized support for arrays
with features like compressed storage and query language extensions.
What is JSON? - answer✔"JavaScript Object Notation, a textual representation widely used for
data exchange."
How is data represented in JSON? - answer✔As objects (key-value maps) and arrays.
What are SQL extensions for JSON? - answer✔"Storing JSON data, extracting data from JSON
objects using path expressions, generating JSON from relational data."
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