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WGU D NEWEST EXAM WITH 200 REVIEW QUESTIONS & CORRECT VERIFIED ANSWERS ALREADY GRADED A+/ WESTERN GOVERNORS UNIVERSITY D027 ACTUAL EXAM (LATEST)$18.99
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WGU - D426: Objective Assessment 2024-2025
NEWEST EXAM WITH 200 REVIEW QUESTIONS
& CORRECT VERIFIED ANSWERS ALREADY
GRADED A+/ WESTERN GOVERNORS
UNIVERSITY D027 ACTUAL EXAM (LATEST)
Database Application - ✔✔ANSWER✔✔-Software that
helps business users interact with database systems.
Database Administrator - ✔✔ANSWER✔✔-Responsible
for securing the database system against unauthorized
users. A database administrator enforces procedures for
user access and database system availability.
Authorization - ✔✔ANSWER✔✔-Many database users
should have limited access to specific tables, columns, or
rows of a database. Database systems authorize
individual users to access specific data.
Table Scan - ✔✔ANSWER✔✔-A _______ _________ is a
database operation that reads table blocks directly,
without accessing an index.
,Index Scan - ✔✔ANSWER✔✔-An ________ _________
is a database operation that reads index blocks
sequentially, in order to locate the needed table blocks.
Hit Ratio - ✔✔ANSWER✔✔-_____ ______, also called
filter factor or selectivity, is the percentage of table rows
selected by a query. When a SELECT query is executed
Binary Search - ✔✔ANSWER✔✔-In a ________ search,
the database repeatedly splits the index in two until it finds
the entry containing the search value:
Dense index - ✔✔ANSWER✔✔-A _______ _______
contains an entry for every table row.
Sparse index - ✔✔ANSWER✔✔-A ________ _______
contains an entry for every table block.
Multi-level index - ✔✔ANSWER✔✔-A ____________
________ stores column values and row pointers in a
hierarchy.
Fan-out - ✔✔ANSWER✔✔-The number of index entries
per block is called the __________ of a multi-level index.
Tablespace - ✔✔ANSWER✔✔-A tablespace is a database
object that maps one or more tables to a single file.
, Rules - ✔✔ANSWER✔✔-Database systems ensure data
is consistent with structural and business rules.
Query Processor - ✔✔ANSWER✔✔-Interprets queries,
creates a plan to modify the database or retrieve data, and
returns query results to the application. Performs query
optimization to ensure the most efficient instructions are
executed on the data.
Storage Manager - ✔✔ANSWER✔✔-Translates the query
processor instructions into low-level file-system
commands that modify or retrieve data. Database sizes
range from megabytes to many terabytes, so the storage
manager uses indexes to quickly locate data.
Transaction Manager - ✔✔ANSWER✔✔-Ensures
transactions are properly executed. The transaction
manager prevents conflicts between concurrent
transactions. The transaction manager also restores the
database to a consistent state in the event of a transaction
or system failure.
Metadata - ✔✔ANSWER✔✔-Data about the database,
such as column names and the number of rows in each
table.
Relational Database - ✔✔ANSWER✔✔-Stores data in
tables, columns, and rows, similar to a spreadsheet.
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