CSCI 3700 Midterm Exam Questions With Verified Answers.
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Course
CSCI 3700
Institution
CSCI 3700
CSCI 3700 Midterm Exam Questions With
Verified Answers.
Database management system - answerA collection of interrelated data in an environment that
is convenient and efficient to use.
Collections that are highly valuable, relatively large, and accessed by multiple users and
applications, often...
CSCI 3700 Midterm Exam Questions With
Verified Answers.
Database management system - answer✔A collection of interrelated data in an environment that
is convenient and efficient to use.
Collections that are highly valuable, relatively large, and accessed by multiple users and
applications, often at the same time. - answer✔Database systems are used to manage this kind of
data.
Database management system - answer✔A complex software system whose task is to manage a
large, complex collection of data.
Data that is redundant, inconsistent, and difficult to access. - answer✔This type of data occurred
when database applications were stored directly on file systems.
False - answer✔True or false: When databases were built on file systems, integrity constraints
were defined clearly and explicitly.
Atomicity of updates - answer✔An important feature of databases that ensures tables do not exist
in an inconsistent state.
True - answer✔True or false: Databases allow controlled concurrent access.
Database management system - answer✔A collection of interrelated data and a set of programs
that allow users to access and modify this data.
Data model - answer✔A collection of conceptual tools for describing data, data relationships,
data semantics, and consistency constraints.
Data abstraction - answer✔Hides the complexity of data structures to make them more
presentable to users.
False - answer✔True or false: SQL databases use a semi-structured data model.
Relational model - answer✔The type of data model used by SQL databases.
Physical level - answer✔Describes how a record is stored.
Logical level - answer✔Describes data stored in a database and the relationships among the data.
View level - answer✔Hides certain details so different user roles can see various amounts of
data.
Logical schema - answer✔The overall logical structure of a database.
Physical schema - answer✔The overall physical structure of a database.
Instance - answer✔The actual content of a database at a particular point in time.
Physical data independence - answer✔The ability to modify the physical schema without
changing the logical schema.
True - answer✔True or false: Interfaces between various database levels should be well-defined
so that changes in one part do not seriously influence the others.
Data definition language (DDL) - answer✔Specification notation for defining the database
schema.
Data dictionary - answer✔Stores table templates generated by a DDL compiler.
Database schemas, integrity constraints, and authorization. - answer✔Data dictionaries store this
kind of metadata.
Database manipulation language (DML) - answer✔A language for accessing and updating the
data organized by a particular data model.
Procedural - answer✔A type of DML that requires a user to specify what data is needed and how
to get that data.
Declarative - answer✔A type of DML that requires a user to specify what data is needed without
specifying how to get it.
Query language - answer✔The portion of a DML that involves informational retrieval.
Structured query language (SQL) - answer✔A nonprocedural query language that takes one or
more tables as input and returns only one.
False - answer✔True or false: SQL is a Turing complete language.
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