What is the advantge and disadvantage of mysql_connet() and
mysql_pconnect() ? in which condition will you use
mysql_connect() and mysql_pconnect().
Answer Posted / ltmert
If you're connecting to a MySQL database in your PHP
application, you'll find that there are two alternative
connctions - mysql_connect which establishes a new
connection "each time" and mysql_pconnect which uses
persistant connections. Which should you use?
Mysql_connect opens a new connection each time a PHP page is
called up, and closes the connection down again at the end
of the request. It's ideal for pages that don't have a heavy
usage - doesn't need tuning, is straightforward internally.
If you compare MySQL to a shop, this is the connection that
you would use for a small shop where the door is opened each
time a new customer wishes to enter.
Mysql_pconnect will also open a new connection when a PHP
page is called up (at any rate, it will the first time after
a server reboot), but it will NOT close the connection at
the end of the request - instead, it will save it in a
connection pool so that a subsequent request can continue to
use the same connection. It's intended for pages that do
have a heavy usage - where the resources burn up by opening
and closing connections every time might have a severe
effect on performance. If your local supermarket had a door
that was opened each time someone went in and out, there
would be a lot of needless opening and closing going on -
better to leave it open and let a whole lot of people in and
out at the same time.
But mysql_pconnect does require some tuning of the servers
and you may need to limit the numbers of connections /
children and configure timeouts and how to deal with idle
children. The PHP website includes an overview of this to
get you started.
Finally, it is worth stressing what a persistant connect
does NOT give you. It does NOT give you sessions. It does
NOT give you a per-site-visitor login. It does NOT give you
any extra functioanllity. What it does give you - in the
right circumstances - is an efficiency improvement.
Is This Answer Correct ? | 8 Yes | 1 No |
Post New Answer View All Answers
How can we get the error when there is a problem to upload a file?
what is PDO?
Tell me how can we pass the variable through the navigation between the pages?
How do I check if a given variable is empty?
How to execute an sql query? How to fetch its result?
What is htaccess in php?
Is nan in php?
If we login more than one browser windows at the same time with same user and after that we close one window, then is the session is exist to other windows or not? And if yes then why? If no then why?
Write a program to display table of a number using php?
What is use of in_array() function in php?
Which Scripting Engine PHP uses?
How can we access the data sent through the url with the get method?
Swap two variables value without using third variable in php ?
What is the difference between for and foreach in php?
What is the difference between $name and $$name?