I\'m currently storing a fair amount of data in the $_SESSION variable. I\'m doing this so I don\'t need to keep accessing the database.
Should I be worried about me
.. in addition to what @Pekka wrote:
PHP sessions an not alternative to a caching solution !
You should investigate if your server has APC available. You should use that on top of layer which accesses information from database (assuming you actually have an OO code).