Tablespaces

A common paradigm for optimizing performance in database systems is the use of tablespaces to organize disk layout.

Peringatan

Django tidak membuat tablespace untuk anda. Silahkan mengacu ke dokumentasi mesis basisdata anda untuk rincian di membuat dan mengelola tablespace.

Mengumumkan tablespace untuk table

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.

Mengumumkan tablespace untuk indeks

You can pass the db_tablespace option to a Field constructor to specify an alternate tablespace for the Field’s column index. If no index would be created for the column, the option is ignored.

You can use the DEFAULT_INDEX_TABLESPACE setting to specify a default value for db_tablespace.

If db_tablespace isn’t specified and you didn’t set DEFAULT_INDEX_TABLESPACE, the index is created in the same tablespace as the tables.

Sebuah contoh

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)
    edges = models.ManyToManyField(to="self", db_tablespace="indexes")

    class Meta:
        db_tablespace = "tables"

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.

Dukungan basisdata

PostgreSQL dan Oracle mendukung tablespace. SQLite dan MySQL tidak.

When you use a backend that lacks support for tablespaces, Django ignores all tablespace-related options.