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Data Management Foundations|Complete Questions With A+ Graded Answers

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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...

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  • May 4, 2024
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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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