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I've noticed that I'm using sessions quite a bit to keep track of data and plan on undertaking a project that will use even more sessions. From what I understand, when a session is created a file is also created on the server. My use of sessions involves creating them, and then unsetting them when I'm done with them; sometimes this unsetting occurs at the end of a page, sometimes soon after the session is created.
I'm concerned that all this session setting and unsetting will cause the hard drive to become heavily fragmented; especially with large amounts of traffic. Is there need for concern here or should I proceed with my project?
Windows can choke on a folder with thousands of files, but if the overall site/server performance is good, the sessions really shouldn't make much of a difference.
sometimes this unsetting occurs at the end of a page, sometimes soon after the session is created.
You might want to look into using memcache [php.net] (it provides a session.save_handler) , especially if you're creating and deleting sessions within the same request often.
Sessions don't have to be saved on disk.