Fixed #3137 -- Added 'Clearing the session table' section to docs/sessions.txt
git-svn-id: http://code.djangoproject.com/svn/django/trunk@4268 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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@ -217,6 +217,23 @@ browser-length cookies -- cookies that expire as soon as the user closes his or
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her browser. Use this if you want people to have to log in every time they open
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a browser.
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Clearing the session table
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==========================
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Note that session data can accumulate in the ``django_session`` database table
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and Django does *not* provide automatic purging. Therefore, it's your job to
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purge expired sessions on a regular basis.
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To understand this problem, consider what happens when a user uses a session.
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When a user logs in, Django adds a row to the ``django_session`` database
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table. Django updates this row each time the session data changes. If the user
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logs out manually, Django deletes the row. But if the user does *not* log out,
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the row never gets deleted.
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Django provides a sample clean-up script in ``django/bin/daily_cleanup.py``.
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That script deletes any session in the session table whose ``expire_date`` is
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in the past -- but your application may have different requirements.
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Settings
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========
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