python - Why running django's session cleanup command kill's my machine resources? -


i have 1 year production site configured django.contrib.sessions.backends.cached_db backend mysql dabatase backend. reason why choice cached_db mix of security read performance.

the problem is, cleanup command, responsible delete expired sessions, sadly never been executed, resuting in 2.3gb session table data length, 6 million rows , 500mb index length.

when try run ./manage.py cleanup (in django 1.3) command, or ./manage.py clearsessions (django`s 1.5 correspondent), process never ends (or patience doesn't complete 3 hours).

the code django use's is:

session.objects.filter(expire_date__lt=timezone.now()).delete()

in first impression, think that's normal because table has 6m rows, but, after inspect system's monitor, discover memory , cpu used python process, not mysqld, fullfilling machine's resources. think that's terrible wrong command code. seem's that's python iterate on founded expired sessions row before delete each of them, 1 one. in case, code refactoring raw delete from command can resolve problem , helps django community, right? but, if case, queryset delete command acting weird , none optimized in opinion. right?

thanks


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