On Debian and Debian based systems, it's necessary to add a couple of ini_set()s to the settings.php file, otherwise the session garbage collection of PHP (and Drupal) would never run resulting in very, very large sessions table.
The instructions are at http://drupal.org/node/35834 I wonder if this should be included somewhere in the installation guide as a Hint or so. It was really helpful.
Closed: outdated
Correction/Clarification
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