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<PHP Sessions - Files vs Database Based ⁄ >




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One may think changing PHP session handler from file based to database driven is fully transparent. In many cases it is, sometimes however it may cause some unexpected problems as happened to one of our customers.

If you use file based sessions PHP will lock session file for whole script execution duration, which means all requests from the same sessions will be serialized on PHP level, which means they also will be serialized for single user on database level. If you change to store PHP sessions in MySQL instead this effect may be no more true and you may have number of requests executing for the same session at the same time. First of course means you may have your session data damaged because you will have lost session variables update from one of the script, in addition however you may run into database related issues of modifying user profile or other user/session related data in parallel, if you do not use transactions or lock tables.

So how you can get back your old file based session behavior with MySQL Sessions ?



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