Which statement best describes the meaning of the value for the key_len column?
It shows how many bytes will be used from each index row.
It shows the number of characters indexed in the key.
It shows the total size of the index row.
It shows how many columns in the index are examined.
Correct answer: A
Question 2
A particular government’s security policy is to have very strict data encryption and safety settings. This is done by restricting access based on their own CA authority and limiting access to particular users within a department. Which method could be used to restrict access as required?
using GRANT … REQUIRE X509 AND REQUIRE ISSUER ‘/C=…..’ AND REQUIRE SUBJECT ‘/C=…..’
using GRANT USAGE, X509, …….ON *.* TO user@remotehost IDENTIFIED BY ‘secret_password’
using GRANT … REQUIRE SSL for a secure connection
using GRANT USAGE, SSL, …..ON *.* TO user@remotehost IDENTIFIED BY ‘secret_password’
Correct answer: A
Question 3
What does the possible_keys column in this output denote?
if it is possible for you to include any indexes in your query
whether there are any indexes on the tables that you are querying
if there are any indexes that may be used to solve this query