Who clears a session files on server?

Which of the following command can be used to shutdown an already running MySQL server?

Which of the following Linux command outputs the processor architecture ?

Which of the following Linux command can be used to output the shared library dependencies ?

Which of the following is NOT a valid unix env variable?

What output will be If you try to perform an arithmetic operation on a column containing NULL values?

Which is correct with regard to indexes in MySql?

Which is introduced in PHP5?

Correct way to check whether the cookie is set or not before retrieving the value from 'LoginCookie'?

John Mark, an administrator, wants to set the Web server so that it will not show a directory listing if a user requests a page which is a directory. Which modification should he set up in the httpd.conf?

Food Cart Accounting System (FOCAS) is maintaining products in the products table, and wants to see the products which are 50 or more than 50 short of the minimum stock limit. The structure of the Products table is: ProductID ProductName CurrentStock MinimumStock Two possible queries are: Query 1:select * from products where currentStock>MinimumStock+50 Query 2:select * from products where currentStock-50>MinimumStock Which is correct?