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
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller doctorfirstbest. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $21.99. You're not tied to anything after your purchase.