Database migration operations¶
All of these operations are available from
Creating extension using migrations¶
You can create a PostgreSQL extension in your database using a migration file. This example creates an hstore extension, but the same principles apply for other extensions.
Set up the hstore extension in PostgreSQL before the first
AddField operation that involves
HStoreField by adding a migration with
from django.contrib.postgres.operations import HStoreExtension class Migration(migrations.Migration): ... operations = [ HStoreExtension(), ... ]
Creating the extension requires a database user with superuser privileges.
If the Django database user doesn’t have superuser privileges, you’ll have
to create the extension outside of Django migrations with a user that has
the appropriate privileges. In that case, connect to your Django database and
run the query
CREATE EXTENSION IF NOT EXISTS hstore;.
hstoreextension and also sets up the connection to interpret hstore data for possible use in subsequent migrations.
Index concurrent operations¶
PostgreSQL supports the
CONCURRENTLY option to
CREATE INDEX and
DROP INDEX statements to add and remove indexes without locking out writes.
This option is useful for adding or removing an index in a live production
AddIndex, but creates an index with the
CONCURRENTLYoption. This has a few caveats to be aware of when using this option, see the PostgreSQL documentation of building indexes concurrently.
RemoveIndex, but removes the index with the
CONCURRENTLYoption. This has a few caveats to be aware of when using this option, see the PostgreSQL documentation.
CONCURRENTLY option is not supported inside a transaction (see