mirror of
https://github.com/django/django.git
synced 2024-12-26 11:06:07 +00:00
132 lines
5.0 KiB
Plaintext
132 lines
5.0 KiB
Plaintext
=================================
|
|
PostgreSQL specific model indexes
|
|
=================================
|
|
|
|
.. module:: django.contrib.postgres.indexes
|
|
|
|
The following are PostgreSQL specific :doc:`indexes </ref/models/indexes>`
|
|
available from the ``django.contrib.postgres.indexes`` module.
|
|
|
|
``BrinIndex``
|
|
=============
|
|
|
|
.. class:: BrinIndex(autosummarize=None, pages_per_range=None, **options)
|
|
|
|
Creates a `BRIN index
|
|
<https://www.postgresql.org/docs/current/static/brin-intro.html>`_.
|
|
|
|
Set the ``autosummarize`` parameter to ``True`` to enable `automatic
|
|
summarization`_ to be performed by autovacuum.
|
|
|
|
The ``pages_per_range`` argument takes a positive integer.
|
|
|
|
.. _automatic summarization: https://www.postgresql.org/docs/current/static/brin-intro.html#BRIN-OPERATION
|
|
|
|
.. versionchanged:: 2.2
|
|
|
|
The ``autosummarize`` parameter was added.
|
|
|
|
``BTreeIndex``
|
|
==============
|
|
|
|
.. class:: BTreeIndex(fillfactor=None, **options)
|
|
|
|
.. versionadded:: 2.2
|
|
|
|
Creates a B-Tree index.
|
|
|
|
Provide an integer value from 10 to 100 to the fillfactor_ parameter to
|
|
tune how packed the index pages will be. PostgreSQL's default is 90.
|
|
|
|
.. _fillfactor: https://www.postgresql.org/docs/current/static/sql-createindex.html#SQL-CREATEINDEX-STORAGE-PARAMETERS
|
|
|
|
``GinIndex``
|
|
============
|
|
|
|
.. class:: GinIndex(fastupdate=None, gin_pending_list_limit=None, **options)
|
|
|
|
Creates a `gin index
|
|
<https://www.postgresql.org/docs/current/static/gin.html>`_.
|
|
|
|
To use this index on data types not in the `built-in operator classes
|
|
<https://www.postgresql.org/docs/current/static/gin-builtin-opclasses.html>`_,
|
|
you need to activate the `btree_gin extension
|
|
<https://www.postgresql.org/docs/current/static/btree-gin.html>`_ on
|
|
PostgreSQL. You can install it using the
|
|
:class:`~django.contrib.postgres.operations.BtreeGinExtension` migration
|
|
operation.
|
|
|
|
Set the ``fastupdate`` parameter to ``False`` to disable the `GIN Fast
|
|
Update Technique`_ that's enabled by default in PostgreSQL.
|
|
|
|
Provide an integer number of bytes to the gin_pending_list_limit_ parameter
|
|
to tune the maximum size of the GIN pending list which is used when
|
|
``fastupdate`` is enabled. This parameter requires PostgreSQL ≥ 9.5.
|
|
|
|
.. _GIN Fast Update Technique: https://www.postgresql.org/docs/current/static/gin-implementation.html#GIN-FAST-UPDATE
|
|
.. _gin_pending_list_limit: https://www.postgresql.org/docs/current/static/runtime-config-client.html#GUC-GIN-PENDING-LIST-LIMIT
|
|
|
|
``GistIndex``
|
|
=============
|
|
|
|
.. class:: GistIndex(buffering=None, fillfactor=None, **options)
|
|
|
|
Creates a `GiST index
|
|
<https://www.postgresql.org/docs/current/static/gist.html>`_. These indexes
|
|
are automatically created on spatial fields with :attr:`spatial_index=True
|
|
<django.contrib.gis.db.models.BaseSpatialField.spatial_index>`. They're
|
|
also useful on other types, such as
|
|
:class:`~django.contrib.postgres.fields.HStoreField` or the :ref:`range
|
|
fields <range-fields>`.
|
|
|
|
To use this index on data types not in the built-in `gist operator classes
|
|
<https://www.postgresql.org/docs/current/static/gist-builtin-opclasses.html>`_,
|
|
you need to activate the `btree_gist extension
|
|
<https://www.postgresql.org/docs/current/static/btree-gist.html>`_ on
|
|
PostgreSQL. You can install it using the
|
|
:class:`~django.contrib.postgres.operations.BtreeGistExtension` migration
|
|
operation.
|
|
|
|
Set the ``buffering`` parameter to ``True`` or ``False`` to manually enable
|
|
or disable `buffering build`_ of the index.
|
|
|
|
Provide an integer value from 10 to 100 to the fillfactor_ parameter to
|
|
tune how packed the index pages will be. PostgreSQL's default is 90.
|
|
|
|
.. _buffering build: https://www.postgresql.org/docs/current/static/gist-implementation.html#GIST-BUFFERING-BUILD
|
|
.. _fillfactor: https://www.postgresql.org/docs/current/static/sql-createindex.html#SQL-CREATEINDEX-STORAGE-PARAMETERS
|
|
|
|
``HashIndex``
|
|
=============
|
|
|
|
.. class:: HashIndex(fillfactor=None, **options)
|
|
|
|
.. versionadded:: 2.2
|
|
|
|
Creates a hash index.
|
|
|
|
Provide an integer value from 10 to 100 to the fillfactor_ parameter to
|
|
tune how packed the index pages will be. PostgreSQL's default is 90.
|
|
|
|
.. admonition:: Use this index only on PostgreSQL 10 and later
|
|
|
|
Hash indexes have been available in PostgreSQL for a long time, but
|
|
they suffer from a number of data integrity issues in older versions.
|
|
|
|
.. _fillfactor: https://www.postgresql.org/docs/current/static/sql-createindex.html#SQL-CREATEINDEX-STORAGE-PARAMETERS
|
|
|
|
``SpGistIndex``
|
|
===============
|
|
|
|
.. class:: SpGistIndex(fillfactor=None, **options)
|
|
|
|
.. versionadded:: 2.2
|
|
|
|
Creates an `SP-GiST index
|
|
<https://www.postgresql.org/docs/current/static/spgist.html>`_.
|
|
|
|
Provide an integer value from 10 to 100 to the fillfactor_ parameter to
|
|
tune how packed the index pages will be. PostgreSQL's default is 90.
|
|
|
|
.. _fillfactor: https://www.postgresql.org/docs/current/static/sql-createindex.html#SQL-CREATEINDEX-STORAGE-PARAMETERS
|