Tool to clean up expired sessions gracefully
This is a Django management command (as in https://docs.djangoproject.com/en/dev/howto/custom-management-commands/) that cleans up expired sessions from the database.
Django ships with a built-in command to handle session cleanup, but it is problematic when dealing with large session tables. Due to its design, it can block writes to the session table for minutes at a time, potentially disrupting sites that rely on sessions. This command is designed to perform the same maintenance tasks as the built-in command without disrupting a site by locking the table for a really long time.
Install the distribution from PyPI, e.g. pip install django-batch-session-cleanup.
Then, add batch_sesion_cleanup to INSTALLED_APPS in your Django project.
That’s it. You can now run django-admin.py and confirm that the command shows up.
Delete expired sessions in batches of no more than 50000, and sleep for 2 seconds in between batches::
django-admin.py batch-session-cleanup --batch-size=50000 --sleep-time=2
Known Issues and Bugs
- The tool has only been tested thoroughly on a MyISAM MySQL table. I’m not aware of any reason that it wouldn’t work on other SQL session backends, but you should be careful if you’re using it in those environments.
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