================================= PostgreSQL specific model indexes ================================= .. module:: django.contrib.postgres.indexes The following are PostgreSQL specific :doc:`indexes ` available from the ``django.contrib.postgres.indexes`` module. ``BrinIndex`` ============= .. class:: BrinIndex(autosummarize=None, pages_per_range=None, **options) Creates a `BRIN index `_. 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/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/sql-createindex.html#SQL-CREATEINDEX-STORAGE-PARAMETERS ``GinIndex`` ============ .. class:: GinIndex(fastupdate=None, gin_pending_list_limit=None, **options) Creates a `gin index `_. To use this index on data types not in the `built-in operator classes `_, you need to activate the `btree_gin extension `_ 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/gin-implementation.html#GIN-FAST-UPDATE .. _gin_pending_list_limit: https://www.postgresql.org/docs/current/runtime-config-client.html#GUC-GIN-PENDING-LIST-LIMIT ``GistIndex`` ============= .. class:: GistIndex(buffering=None, fillfactor=None, **options) Creates a `GiST index `_. These indexes are automatically created on spatial fields with :attr:`spatial_index=True `. They're also useful on other types, such as :class:`~django.contrib.postgres.fields.HStoreField` or the :ref:`range fields `. To use this index on data types not in the built-in `gist operator classes `_, you need to activate the `btree_gist extension `_ 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/gist-implementation.html#GIST-BUFFERING-BUILD .. _fillfactor: https://www.postgresql.org/docs/current/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/sql-createindex.html#SQL-CREATEINDEX-STORAGE-PARAMETERS ``SpGistIndex`` =============== .. class:: SpGistIndex(fillfactor=None, **options) .. versionadded:: 2.2 Creates an `SP-GiST 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/sql-createindex.html#SQL-CREATEINDEX-STORAGE-PARAMETERS