10/30/24, 9:05 PM 2024 update |WGU - D426: Objective Assessment|2024-2025 most recent |COMPLETE MOST TESTED QUESTIONS AND …
2024 update |WGU - D426: Objective
Assessment|2024-2025 most recent
|COMPLETE MOST TESTED QUESTIONS AND
VERIFIED ANSWERS | (100% correct
solutions)|GET IT A+ RIGHT!!
Terms in this set (151)
Software that helps business users interact with
Database Application
database systems.
Responsible for securing the database system
against unauthorized users. A database
Database Administrator
administrator enforces procedures for user access
and database system availability.
Many database users should have limited access to
specific tables, columns, or rows of a database.
Authorization
Database systems authorize individual users to
access specific data.
Database systems ensure data is consistent with
Rules
structural and business rules.
Interprets queries, creates a plan to modify the
database or retrieve data, and returns query results
Query Processor to the application. Performs query optimization to
ensure the most efficient instructions are executed
on the data.
Translates the query processor instructions into low-
level file-system commands that modify or retrieve
Storage Manager data. Database sizes range from megabytes to many
terabytes, so the storage manager uses indexes to
quickly locate data.
, 10/30/24, 9:05 PM 2024 update |WGU - D426: Objective Assessment|2024-2025 most recent |COMPLETE MOST TESTED QUESTIONS AND …
Ensures transactions are properly executed. The
transaction manager prevents conflicts between
Transaction Manager concurrent transactions. The transaction manager
also restores the database to a consistent state in
the event of a transaction or system failure.
Data about the database, such as column names
Metadata
and the number of rows in each table.
Stores data in tables, columns, and rows, similar to a
Relational Database
spreadsheet.
All _________ ________ systems support the SQL query
Relational Database
language.
Relational systems are ideal for databases that
require an accurate record of every transaction,
Relational Database
such as banking, airline reservation systems, and
student records.
The newer non-relational systems are called
MongoDB (NoSQL) NoSQL, for 'not only SQL', and are optimized for big
data.
INSERT inserts rows into a table.
SELECT retrieves data from a table.
SQL Statements
UPDATE modifies data in a table.
DELETE deletes rows from a table.
A statement that creates a new table by specifying
the table and column names. Each column is
CREATE TABLE
assigned a data type that indicates the format of
(Statement)
column values. Data types can be numeric, textual,
or complex.
INT stores integer values.
DECIMAL stores fractional numeric values.
Data Type
VARCHAR stores textual values.
DATE stores year, month, and day.
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