[mysql] Maximum concurrent connections to MySQL

I want to set up a MySQL database for a social networking website for my college.

My app can have at most 10,000 users. What is the maximum number of concurrent MySQL connections possible?

You might have 10,000 users total, but that's not the same as concurrent users. In this context, concurrent scripts being run.

For example, if your visitor visits index.php, and it makes a database query to get some user details, that request might live for 250ms. You can limit how long those MySQL connections live even further by opening and closing them only when you are querying, instead of leaving it open for the duration of the script.

While it is hard to make any type of formula to predict how many connections would be open at a time, I'd venture the following:

You probably won't have more than 500 active users at any given time with a user base of 10,000 users. Of those 500 concurrent users, there will probably at most be 10-20 concurrent requests being made at a time.

That means, you are really only establishing about 10-20 concurrent requests.

As others mentioned, you have nothing to worry about in that department.

I can assure you that raw speed ultimately lies in the non-standard use of Indexes for blazing speed using large tables.