django/docs/ref/contrib/postgres/indexes.txt

=================================
PostgreSQL specific model indexes
=================================

.. module:: django.contrib.postgres.indexes

.. versionadded:: 1.11

The following are PostgreSQL specific :doc:`indexes </ref/models/indexes>`
available from the ``django.contrib.postgres.indexes`` module.

``BrinIndex``
=============

.. class:: BrinIndex(fields=[], name=None, pages_per_range=None)

    Creates a `BRIN index
    <https://www.postgresql.org/docs/current/static/brin-intro.html>`_.

    The ``pages_per_range`` argument takes a positive integer.

``GinIndex``
============

.. class:: GinIndex(fields=[], name=None, fastupdate=None, gin_pending_list_limit=None)

    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

    .. versionchanged:: 2.0

        The ``fastupdate`` and ``gin_pending_list_limit`` parameters were added.