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https://docs.djangoproject.com/en/3.0/topics/db/multi-db/
Django doesn’t currently provide any support for foreign key or many-to-many relationships spanning multiple databases. If you have used a router to partition models to different databases, any foreign key and many-to-many relationships defined by those models must be internal to a single database.
https://docs.djangoproject.com/en/3.0/ref/databases/
Django attempts to support as many features as possible on all database backends. However, not all database backends are alike, and we’ve had to make design decisions on which features to support and which assumptions we can make safely. This file describes some of the features that might be relevant to Django usage.
https://stackoverflow.com/questions/268089/multiple-database-support-in-django
Eric Florenzano wrote a very good blog post that allows you some multiple database support at: Easy MultipleDatabase Support for Django. It starts by creating a new custom manager that allows you to specify the database settings.
https://code.djangoproject.com/wiki/MultipleDatabaseSupport
Multiple Database Support Update 2009-12-22 : As of today multiple database support has been merged into trunk, any further bugs, feature requests, etc. should be filed on Trac or brought up for discussion on the django-developers mailing list.
https://github.com/vshn/django-probes/issues/4
When multiple databases are configured Django will verify only the one configured as 'default'. We should probably loop over all configured databases, check them in parallel, or provide some way to control which ones should be considered in the connection check.
https://www.webforefront.com/django/modelmultidatabases.html
Multiple databases for Django models: using. All Django model operations described in this chapter and the upcoming chapter are designed to run against the database defined in the default handle in DATABASES, or if provided, the DEFAULT_DB_ALIAS database handle. However, with multiple databases it's possible to selectively execute operations against different databases, overriding the default database. Django models support the using keyword to indicate against which database …
https://docs.djangoproject.com/en/3.0/faq/models/
NoSQL databases are not officially supported by Django itself. There are, however, a number of side projects and forks which allow NoSQL functionality in Django. You can take a look on the wiki page which discusses some projects.
https://code.djangoproject.com/ticket/1142
There are also other use-cases for multiple database connections outside of scaling - talking to two legacy applications at once for example. comment:3 Changed 14 years ago by Kozmo Kid Django may benefit from the ability to define connections at the application level that can override the sitewide setting.
https://docs.djangoproject.com/en/3.0/topics/migrations/
Migrations are supported on all backends that Django ships with, as well as any third-party backends if they have programmed in support for schema alteration (done via the SchemaEditor class). However, some databases are more capable than others when it comes to schema migrations; some of the caveats are covered below.
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