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WGU D115 OBJECTIVE ASSESSMENT 150 QUESTIONS AND VERIFIED ANSWERS ALREADY GRAADED A+. $21.99
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WGU D115 OBJECTIVE ASSESSMENT 150 QUESTIONS AND VERIFIED ANSWERS ALREADY GRAADED A+.
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WGU D115 OBJECTIVE ASSESSMENT 150 QUESTIONS AND VERIFIED ANSWERS ALREADY GRAADED A+. 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...

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  • October 27, 2024
  • 23
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • wgu d115
  • wgu d115 objective assessment
  • wgu d115 objective assessment exam

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  • WGU D115
  • WGU D115

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WGU D115 OBJECTIVE ASSESSMENT 150
QUESTIONS AND VERIFIED ANSWERS
ALREADY GRAADED A+.


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. -
ANSWERTransaction Manager


Data about the database, such as column names and the number of rows in each table.
- ANSWERMetadata


Stores data in tables, columns, and rows, similar to a spreadsheet. -
ANSWERRelational Database


All systems support the SQL query language. -
ANSWERRelational Database




Software that helps business users interact with database systems. -
ANSWERDatabase Application


Responsible for securing the database system against unauthorized users. A database
administrator enforces procedures for user access and database system availability. -
ANSWERDatabase 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. -
ANSWERAuthorization

Database systems ensure data is consistent with structural and business rules. -

,ANSWERRules


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. - ANSWERQuery 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. - ANSWERStorage Manager

, Relational systems are ideal for databases that require an accurate record of every
transaction, such as banking, airline reservation systems, and student records. -
ANSWERRelational Database


The newer non-relational systems are called NoSQL, for 'not only SQL', and are
optimized for big data. - ANSWERMongoDB (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. - ANSWERSQL 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. - ANSWERCREATE TABLE (Statement)


INT stores integer values.
DECIMAL stores fractional numeric values.
VARCHAR stores textual values.
DATE stores year, month, and day. - ANSWERData Type


Analysis
Logical design
Physical design - ANSWERDatabase Design


This phase specifies database requirements without regard to a specific database
system. Requirements are represented as entities, relationships, and attributes. An
entity is a person, place, activity, or thing. A relationship is a link between entities, and
an attribute is a descriptive property of an entity. - ANSWERAnalysis Phase,
Conceptual Design, Entity-Relationship Modeling (Database Design)


This phase implements database requirements in a specific database system. For
relational database systems, design converts entities, relationships, and
attributes into tables, keys, and columns. - ANSWERLogical Design (Database Design)

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