#8408: Add a new meta option: don't do count(*) in admin
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Reporter: LI Daobing | Owner: Thomas Chaumeny
Type: New feature | Status: new
Component: contrib.admin | Version: master
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 0
Needs tests: 1 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
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Comment (by Brett Higgins):
In addition to slow COUNT queries, I've just noticed that the listing page
calls `len()` on a potentially slow queryset:
https://github.com/django/django/blob/9a3454f6046b9b7591fd03e21cf6da0b23c57689/django/contrib/admin/options.py#L1816
On my listing page, I have a couple nested lookups, so this becomes a
complex query with four joins, and it can take tens of seconds to run for
around 600k records. With too many more records than that, I'm running
afoul of AWS Lambda timeouts (30s, just like the Heroku user mentioned
above).
All this to say - any solution to this slow COUNT issue should also
address (avoid) this slow query as well.
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Ticket URL: <https://code.djangoproject.com/ticket/8408#comment:56>
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