|
@@ -1,4 +1,20 @@
|
|
|
Materialized Views
|
|
|
==================
|
|
|
|
|
|
-Lorem ipsum
|
|
|
+Chado is efficient as a data warehouse but queries can become slow depending on the type of query. To help simplify and speed up these queries, materialized views can be employed. For a materialized view, a new database table is created and then populated with the results of a pre-defined SQL query. This allows you to execute a much simpler and faster query on the materialized view when producing user pages. A side effect, however is redundant data, with the materialized view becoming stale if not updated regularly.
|
|
|
+
|
|
|
+Tripal provides a mechanism for populating and updating these materialized views. These can be found on the ``Tripal → Data Storage → Chado -> Materialized Views`` page.
|
|
|
+
|
|
|
+.. image:: ./mviews.1.png
|
|
|
+
|
|
|
+Here we see several materialized views. These were installed automatically by the Tripal Chado module. To update these views, click the **Populate** link for each one.
|
|
|
+
|
|
|
+This will submit jobs to populate the views with data. Now, run the jobs:
|
|
|
+
|
|
|
+.. code-block:: shell
|
|
|
+
|
|
|
+ cd /var/www/html
|
|
|
+ drush trp-run-jobs --user=administrator
|
|
|
+
|
|
|
+
|
|
|
+You can now see that all views are up-to-date on the **Materialized Views Page**. The number of rows in the view table is shown.
|