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Refs #14131 -- Documented why paginating large QuerySets may be slow.

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Daniel Jilg 2016-04-06 13:55:09 +02:00 committed by Tim Graham
parent ab2d34ba3f
commit eed658d7c4
1 changed files with 5 additions and 3 deletions
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docs/topics/pagination.txt
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@ -146,10 +146,12 @@ Required arguments
clause or with a default :attr:`~django.db.models.Options.ordering` on the clause or with a default :attr:`~django.db.models.Options.ordering` on the
model. model.
.. note:: .. admonition:: Performance issues paginating large ``QuerySet``\s
If you are using a ``QuerySet`` with a very large number of items, If you're using a ``QuerySet`` with a very large number of items,
requesting high page numbers might be slow on some database backends. requesting high page numbers might be slow on some databases, because
the resulting ``LIMIT``/``OFFSET`` query needs to count the number of
``OFFSET`` records which takes longer as the page number gets higher.
``per_page`` ``per_page``
The maximum number of items to include on a page, not including orphans The maximum number of items to include on a page, not including orphans