Q$5$

$($a$)$ What are the $3\text{'}$V$\text{'}$s of Big Data?

$($b$)$ Give one example use case of Big Data.

$($c$)$ What are the differences between MapReduce and Hadoop?

$($d$)$ Briefly explain the following three best practices for data security:

$($i$)$ Principle of least privilege

$($ii$)$ Firewall

$($iii$)$Disable the use of LOCAL INFILE

Here is an example of a user login on a web site:

Username:

Password:

Example

Result

SELECT $*$ FROM Users WHERE Name $=$"John Doe" AND Pass $=$"myPass"

$($e$)$ Explain a situation where hacker could log on without knowing the username and password

based on the fact that $==$ is always true.

$($f$)$ Explain a situation where hacker could delete the table "Suppliers" without knowing the

username and password.

$(3$ marks$)$

$($g$)$ How to prevent SQL injection?

$(3$ marks$)$