diff options
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/releases/1.9.txt | 19 | ||||
| -rw-r--r-- | docs/spelling_wordlist | 1 |
2 files changed, 20 insertions, 0 deletions
diff --git a/docs/releases/1.9.txt b/docs/releases/1.9.txt index 3f101a5f94..58522e75fa 100644 --- a/docs/releases/1.9.txt +++ b/docs/releases/1.9.txt @@ -458,6 +458,21 @@ Migrations * When supplying ``None`` as a value in :setting:`MIGRATION_MODULES`, Django will consider the app an app without migrations. +* When applying migrations, the "Rendering model states" step that's displayed + when running migrate with verbosity 2 or higher now computes only the states + for the migrations that have already been applied. The model states for + migrations being applied are generated on demand, drastically reducing the + amount of required memory. + + However, this improvement is not available when unapplying migrations and + therefore still requires the precomputation and storage of the intermediate + migration states. + + This improvement also requires that Django no longer supports mixed migration + plans. Mixed plans consist of a list of migrations where some are being + applied and others are being unapplied. This was never officially supported + and never had a public API that supports this behavior. + Models ^^^^^^ @@ -1094,6 +1109,10 @@ Miscellaneous * The system checks for :class:`~django.contrib.admin.ModelAdmin` now check instances rather than classes. +* The private API to apply mixed migration plans has been dropped for + performance reasons. Mixed plans consist of a list of migrations where some + are being applied and others are being unapplied. + .. _deprecated-features-1.9: Features deprecated in 1.9 diff --git a/docs/spelling_wordlist b/docs/spelling_wordlist index 0aba338d18..b128ef873f 100644 --- a/docs/spelling_wordlist +++ b/docs/spelling_wordlist @@ -580,6 +580,7 @@ postgresql pq pre precisions +precomputation preconfigured prefetch prefetched |