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49 lines
1.5 KiB
ReStructuredText
49 lines
1.5 KiB
ReStructuredText
.. meta::
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:description: Use Postgres indexes with Hasura
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:keywords: hasura, docs, postgres, indexes
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.. _postgres_indexes:
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Postgres indexes
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================
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.. contents:: Table of contents
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:backlinks: none
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:depth: 1
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:local:
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Introduction
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------------
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`Postgres indexes <https://www.postgresql.org/docs/current/sql-createindex.html>`__ are a way of increasing query performance
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based on columns that are queried frequently. The concept is similar to the one of an index in a book.
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It helps accessing the data you're looking for more quickly by maintaining additional metadata.
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.. note::
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Learn more about indexes in the `Postgres documentation <https://www.postgresql.org/docs/current/sql-createindex.html>`__.
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Example
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-------
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**Create an index on the column name in the table authors:**
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Let's say the database receives a large number of requests of authors being queried by their name, for example:
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.. code-block:: sql
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SELECT * FROM authors WHERE name = 'J.K. Rowling';
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We can now create an index on the ``name`` column of the ``authors`` table:
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.. code-block:: sql
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CREATE INDEX author_name_index ON authors (name);
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Since the database is now able to look up the result of these queries more quickly, the performance of these queries will increase significantly.
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Postgres indexes & Hasura
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-------------------------
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Indexes can be used to optimize query performance in Hasura. :ref:`Refer to this page <data_validation_pg_indexes>` for information about query performance and how to add Postgres indexes to Hasura.
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