WGU C170 Learning checks Exam Questions with complete and Correct answers 2024/2025
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WGU 170
WGU C170 Learning checks Exam Questions with complete and Correct answers 2024/2025
Data Sparsity - correct answer A column distribution of values or the number of different values a column can have.
database performance tuning - correct answer A set of activities and procedures designed to r...
WGU C170 Learning checks Exam Questions
with complete and Correct answers
2024/2025
Data Sparsity - correct answer A column distribution of values or the number of
different values a column can have.
database performance tuning - correct answer A set of activities and procedures
designed to reduce the response time of a database system—that is, to ensure that an
end-user query is processed by the DBMS in the minimum amount of time.
database statistics - correct answer In query optimization, measurements about
database objects, such as the number of rows in a table, number of disk blocks used,
maximum and average row length, number of columns in each row, and number of
distinct values in each column. Such statistics provide a snapshot of database
characteristics.
DBMS performance tuning - correct answer Activities to ensure that clients' requests
are addressed as quickly as possible while making optimum use of existing resources.
DELETE - correct answer A SQL command that allows data rows to be deleted from a
table.
Denormalization - correct answer A process by which a table is changed from a higher-
level normal form to a lower-level normal form, usually to increase processing speed.
Denormalization potentially yields data anomalies.
dependency diagram - correct answer A representation of all data dependencies
(primary key, partial, or transitive) within a table.
dependent - correct answer An attribute whose value is determined by another
attribute.
, derived attribute - correct answer An attribute that does not physically exist within the
entity and is derived via an algorithm. For example, the Age attribute might be derived
by subtracting the birth date from the current date.
Determinant - correct answer Any attribute in a specific row whose value directly
determines other values in that row.
Determination - correct answer The role of a key. In the context of a database table,
the statement "A determines B" indicates that knowing the value of attribute A means
that the value of attribute B can be looked up.
DIFFERENCE - correct answer A SQL clause that produces only a list of values that
are different from one another.
Domain - correct answer In data modeling, the construct used to organize and
describe an attribute's set of possible values.
DROP INDEX - correct answer A SQL command used to delete database objects such
as tables, views, indexes, and users.
DROP TABLE - correct answer A SQL command used to delete database objects such
as tables, views, indexes, and users.
dynamic query optimization - correct answer The process of determining the SQL
access strategy at run time, using the most up-to-date information about the database.
dynamic statistical generation mode - correct answer In a DBMS, the capability to
automatically evaluate and update the database access statistics after each data
access operation.
Entity Integrity - correct answer The property of a relational table that guarantees each
entity has a unique value in a primary key and that the key has no null values.
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