Data Management Foundations|Complete Questions With A+ Graded Answers
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Course
WGU Data Management
Institution
WGU Data Management
Data Management Foundations|Complete Questions With A+ Graded Answers
A database application is
software that helps business users interact with database systems
A database administrator is
responsible for securing the database system against unauthorized users.
A database admi...
Data Management Foundations|Complete Questions
With A+ Graded Answers
A database application is
software that helps business users interact with database systems
A database administrator is
responsible for securing the database system against unauthorized users.
A database administrator enforces
procedures for user access and database system availability.
Authorization meaning when it comes to database access
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.
Rules of database systems
Database systems ensure data is consistent with structural and business rules
The architecture of a database system describes
the internal components and the relationships between components
The query processor
interprets queries, creates a plan to modify the database or retrieve data, and returns query results to
the application
The query processor performs
query optimization to ensure the most efficient instructions are executed on the data.
,The storage manager translates
the query processor instructions into low-level file-system commands that modify or retrieve data
Database sizes range from
from megabytes to many terabytes,
the storage manager uses what to quickly locate data
indexes
Metadata is
data about the database, such as column names and the number of rows in each table.
A relational database stores
data in tables, columns, and rows, similar to a spreadsheet.
All relational database systems support what query language model
SQL
Relational systems are ideal for
databases that require an accurate record of every transaction, such as banking, airline reservation
systems, and student records.
The newer non-relational systems are called
NoSQL, for 'not only SQL'
NoSQL, for 'not only SQL' is optimized for
big business
MongoDB is what type of database
NoSQL
, An SQL statement is a
database command, such as a query that inserts, selects, updates, or deletes data:
INSERT
inserts rows into a table.
SELECT
retrieves data from a table.
UPDATE
modifies data in a table.
DELETE
deletes rows from a table.
The SQL CREATE TABLE statement creates
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
INT
stores integer values.
DECIMAL
stores fractional numeric values.
VARCHAR
stores textual values
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