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Diffstat (limited to 'docs/ref')
| -rw-r--r-- | docs/ref/models/querysets.txt | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/docs/ref/models/querysets.txt b/docs/ref/models/querysets.txt index 749a979db6..d17d869164 100644 --- a/docs/ref/models/querysets.txt +++ b/docs/ref/models/querysets.txt @@ -1667,6 +1667,21 @@ methods on your models. It does, however, emit the :data:`~django.db.models.signals.post_delete` signals for all deleted objects (including cascaded deletions). +.. versionadded:: 1.5 + Allow fast-path deletion of objects + +Django needs to fetch objects into memory to send signals and handle cascades. +However, if there are no cascades and no signals, then Django may take a +fast-path and delete objects without fetching into memory. For large +deletes this can result in significantly reduced memory usage. The amount of +executed queries can be reduced, too. + +ForeignKeys which are set to :attr:`~django.db.models.ForeignKey.on_delete` +DO_NOTHING do not prevent taking the fast-path in deletion. + +Note that the queries generated in object deletion is an implementation +detail subject to change. + .. _field-lookups: Field lookups |