#28459: Improve performance of QuerySet
-------------------------------------+-------------------------------------
Reporter: Sergey Fedoseev | Owner: nobody
Type: | Status: closed
Cleanup/optimization |
Component: Database layer | Version: master
(models, ORM) |
Severity: Normal | Resolution: fixed
Keywords: | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Sergey Fedoseev):
[https://github.com/django/django/pull/9070 PR (Improved performance of
loading models from DB)]
{{{
class TestModel(models.Model):
field1 = models.IntegerField(null=True)
field2 = models.IntegerField(null=True)
field3 = models.IntegerField(null=True)
field4 = models.IntegerField(null=True)
field5 = models.IntegerField(null=True)
}}}
`TestModel.objects.count() == 20000`, values for all fields `is None`.
Before:
{{{
In [7]: %timeit for x in TestModel.objects.all(): pass
163 ms ± 1.41 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)
}}}
After:
{{{
In [7]: %timeit for x in TestModel.objects.all(): pass
143 ms ± 1.07 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/28459#comment:24>
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