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WGU C170 Chapter 5 ALREADY PASSED
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access plan - A set of instructions generated at application compilation time that is created and managed by a DBMS. The access plan predetermines how an application's query will access the database at run time. algorithms - A process or set of operations in a calculation. automatic query optim...

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  • November 30, 2023
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  • 2023/2024
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WGU C170 Chapter 5 ALREADY PASSED

access plan - ✔✔A set of instructions generated at application compilation time that is created and
managed by a DBMS. The access plan predetermines how an application's query will access the
database at run time.



algorithms - ✔✔A process or set of operations in a calculation.



automatic query optimization - ✔✔A method by which a DBMS finds the most efficient access path
for the execution of a query.



B-tree index - ✔✔An ordered data structure organized as an upside-down tree.



bitmap index - ✔✔An index that uses a bit array (0s and 1s) to represent the existence of a value or
condition.



buffer cache - ✔✔See data cache



data cache - ✔✔A shared, reserved memory area that stores the most recently accessed data blocks
in RAM. Also called buffer cache.



data files - ✔✔A named physical storage space that stores a database's data. It can reside in a
different directory on a hard disk or on one or more hard disks. All data in a database is stored in
data files. A typical enterprise database is normally composed of several data files. A data file can
contain rows from one or more tables.



data sparsity - ✔✔A column distribution of values or the number of different values a column can
have.



database performance tuning - ✔✔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.

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