WGU D115 OBJECTIVE ASSESSMENT 150
QUESTIONS AND VERIFIED ANSWERS
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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...
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
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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