Exhibit:

What does the possible_keys column in this output denote?

One of your colleagues is trying to make a change using the mysqlcommand-line client for his or her application session.
The colleague instant messages you this command:
mysql> SET SESSION max_connections = 200;
Why does the command fail?

You have a server that has very limited memory but has a very large table.
You will use mysqldumpto back up this table.
Which option will ensure mysqldumpwill process a row at a time instead of buffering a set of rows?

A MySQL Server has been running an existing application successfully for six months. The my.cnf is adjusted to contain this additional configuration:

The MySQL Server is restarted without error.
What effect will the new configuration have on existing account?

What are three methods to reduce MySQL server exposure to remote connections?
(Choose three.)