#30842: Prefetch_related spends considerable time constructing querysets.
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Reporter: Alex | Owner: nobody
Aktsipetrov |
Type: | Status: new
Cleanup/optimization |
Component: Database | Version: master
layer (models, ORM) |
Severity: Normal | Keywords: prefetch_related
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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As part of the [https://code.djangoproject.com/ticket/26226 bugfix] django
started constructing N+1 querysets during a typical prefetch_related call
while only 2 sql queries are executed.
This adds a noticeable slowdown. Attaching the flamegraph for queryset
fetching 100 objects.
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Ticket URL: <https://code.djangoproject.com/ticket/30842>
Django <https://code.djangoproject.com/>
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