A common paradigm for optimizing performance in database systems is the use of tablespaces to organize disk layout.
Django does not create the tablespaces for you. Please refer to your database engine’s documentation for details on creating and managing tablespaces.
A tablespace can be specified for the table generated by a model by supplying the
db_tablespace option inside the model’s
class Meta. This option also affects tables automatically created for
ManyToManyFields in the model.
You can use the
DEFAULT_TABLESPACE setting to specify a default value for
db_tablespace. This is useful for setting a tablespace for the built-in Django apps and other applications whose code you cannot control.
You can pass the
db_tablespace option to an
Index constructor to specify the name of a tablespace to use for the index. For single field indexes, you can pass the
db_tablespace option to a
Field constructor to specify an alternate tablespace for the field’s column index. If the column doesn’t have an index, the option is ignored.
class TablespaceExample(models.Model): name = models.CharField(max_length=30, db_index=True, db_tablespace="indexes") data = models.CharField(max_length=255, db_index=True) shortcut = models.CharField(max_length=7) edges = models.ManyToManyField(to="self", db_tablespace="indexes") class Meta: db_tablespace = "tables" indexes = [models.Index(fields=['shortcut'], db_tablespace='other_indexes')]
In this example, the tables generated by the
TablespaceExample model (i.e. the model table and the many-to-many table) would be stored in the
tables tablespace. The index for the name field and the indexes on the many-to-many table would be stored in the
indexes tablespace. The
data field would also generate an index, but no tablespace for it is specified, so it would be stored in the model tablespace
tables by default. The index for the
shortcut field would be stored in the
PostgreSQL and Oracle support tablespaces. SQLite and MySQL don’t.
When you use a backend that lacks support for tablespaces, Django ignores all tablespace-related options.
© Django Software Foundation and individual contributors
Licensed under the BSD License.