How do I alter a materialized view in PostgreSQL?

How do I alter a materialized view in PostgreSQL?

ALTER MATERIALIZED VIEW changes various auxiliary properties of an existing materialized view. You must own the materialized view to use ALTER MATERIALIZED VIEW. To change a materialized view’s schema, you must also have CREATE privilege on the new schema.

How do I grant access to a materialized view in PostgreSQL?

Give SELECT permissions the new test_mv materialized view to the my_user role. CREATE ROLE my_user WITH NOLOGIN; GRANT SELECT ON test_mv TO my_user; To test the SELECT permission use SET ROLE to change the security context to the my_user role and verify with another check of current_user .

Can you index a materialized view Postgres?

Because a materialized view actually is a table, we can create indexes.

How do materialized views work in Postgres?

Materialized views in PostgreSQL use the rule system like views do, but persist the results in a table-like form. When a materialized view is referenced in a query, the data is returned directly from the materialized view, like from a table; the rule is only used for populating the materialized view.

How do you grant selects on a materialized view?

Right-click on a materialized view, and select Grant/Revoke Privileges. The Grant option is selected by default. In the Grantee section, select Public to grant privileges to all users. Or, select Specified Users option to grant privileges to specific users.

How to store a materialized view in PostgreSQL?

Learn how to store the results of a query with the help of materialized views in PostgreSQL. If you work in SQL (preferably a PostgreSQL user) extensively or on an average level to query databases, then you might have written a good number of complex queries to find answers to critical questions.

How to load data into a materialized view?

To load data into a materialized view, you use the REFRESH MATERIALIZED VIEW statement as shown below: When you refresh data for a materialized view, PostgreSQL locks the entire table therefore you cannot query data against it. To avoid this, you can use the CONCURRENTLY option.

How to refresh rental by category in PostgreSQL?

From now on, you can refresh the data in the rental_by_category view using the REFRESH MATERIALIZED VIEW statement. However, to refresh it with CONCURRENTLY option, you need to create a UNIQUE index for the view first. Let’s refresh data concurrently for the rental_by_category view.

What are the requirements for concurrently in PostgreSQL?

One requirement for using CONCURRENTLY option is that the materialized view must have a UNIQUE index. Notice that CONCURRENTLY option is only available from PostgreSQL 9.4. Removing a materialized view is pretty straightforward as we have done for tables or views.