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)
Software that helps business users interact with database
systems. - ✔✔ANSWER✔✔-Database Application
Responsible for securing the database system against
unauthorized users. A database administrator enforces
procedures for user access and database system
availability. - ✔✔ANSWER✔✔-Database Administrator
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.
- ✔✔ANSWER✔✔-Authorization
Database systems ensure data is consistent with
structural and business rules. - ✔✔ANSWER✔✔-Rules
,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. -
✔✔ANSWER✔✔-Query Processor
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. - ✔✔ANSWER✔✔-Storage Manager
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. - ✔✔ANSWER✔✔-
Transaction Manager
Data about the database, such as column names and the
number of rows in each table. - ✔✔ANSWER✔✔-
Metadata
Stores data in tables, columns, and rows, similar to a
spreadsheet. - ✔✔ANSWER✔✔-Relational Database
All _________ ________ systems support the SQL query
language. - ✔✔ANSWER✔✔-Relational Database
, Relational systems are ideal for databases that require an
accurate record of every transaction, such as banking,
airline reservation systems, and student records. -
✔✔ANSWER✔✔-Relational Database
The newer non-relational systems are called NoSQL, for
'not only SQL', and are optimized for big data. -
✔✔ANSWER✔✔-MongoDB (NoSQL)
INSERT inserts rows into a table.
SELECT retrieves data from a table.
UPDATE modifies data in a table.
DELETE deletes rows from a table. - ✔✔ANSWER✔✔-
SQL Statements
A statement that creates a new table by specifying the
table and column names. Each column is assigned a data
type that indicates the format of column values. Data types
can be numeric, textual, or complex. - ✔✔ANSWER✔✔-
CREATE TABLE (Statement)
INT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day. - ✔✔ANSWER✔✔-
Data Type
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