REFRESH MATERIALIZED VIEW mymatview; マテリアライズドビューに関する情報は PostgreSQL システムカタログでビューやテーブルに対するものと全く同様に保持されています。 そのため、パーサにとってマテリアライズドビューはテーブルやビューと同じリレーションです。 Tuesday, August 13. Pass in the name of the materialized view, and the name of the view that it is based on. You must own the materialized view to use ALTER MATERIALIZED VIEW. postgres=# REFRESH MATERIALIZED VIEW CONCURRENTLY mv_data; A unique index will need to exist on the materialized view though. Never forget that a view is just a “crystallized” SQL statement and gets replaced by its definition when the query is executed. La requête est exécutée et utilisée pour peupler la vue à l'exécution de la commande (sauf si WITH NO DATA est utilisé) et peut être rafraichi plus tard en utilisant REFRESH MATERIALIZED VIEW.. ALTER MATERIALIZED VIEW — change the definition of a materialized view. Copyright © 1996-2020 The PostgreSQL Global Development Group, PostgreSQL 13.1, 12.5, 11.10, 10.15, 9.6.20, & 9.5.24 Released. This function will see if a materialized view with that name is already created. A materialized view executes the query once and then holds onto those results for your viewing pleasure until you refresh the materialized view again. "myMV" OWNER TO postgres; The new schema for the materialized view. Note that you have to create the view first, of course. A view can be created from one or many tables, which depends on the written PostgreSQL query to create a view. this form to report a documentation issue. The statement subforms and actions available for ALTER MATERIALIZED VIEW are a subset of those available for ALTER TABLE, and have the same meaning when used for materialized views. To alter the owner, you must also be a direct or indirect member of the new owning role, and that role must have CREATE privilege on the materialized view's schema. Here is the code for creating that materialized view in PostgreSQL: CREATE MATERIALIZED VIEW public. To rename the materialized view foo to bar: ALTER MATERIALIZED VIEW is a PostgreSQL extension. The new name for the materialized view. A materialized view is a database object that contains the results of a query. © Postgres Professional Europe Limited, 2015 — 2020, Your message is accepted. It is to note that creating a materialized view is not a solution to inefficient queries. The DEPENDS ON EXTENSION form marks the materialized view as dependent on an extension, such that the materialized view will automatically be dropped if the extension is dropped. your experience with the particular feature or requires further clarification, Examples. See Also In case you use WITH NO DATA, the view is flagged as unreadable. All options to optimize a slow running query should be exhausted before implementing a materialized view. You must own the materialized view to use ALTER MATERIALIZED VIEW. With materialized views, developers can efficiently access query results with the tradeoff that materialized view data will be out of date as soon as the underlying query data changes. See the descriptions for ALTER TABLE for details. alter view 文または create or replace view文 を使用すると作成済みのビューを変更することができます。ここではビューを変更する方法について解説します。 Выполнить ALTER MATERIALIZED VIEW может только владелец материализованного представления. Otherwise, it creates a new table from the view, and inserts a row into the matviews table. (These restrictions enforce that altering the owner doesn't do anything you couldn't do by dropping and recreating the materialized view. (These restrictions enforce that altering the owner doesn't do anything you couldn't do by dropping and recreating the materialized view. You must own the materialized view to use ALTER MATERIALIZED VIEW. When I run "refresh materialized view concurrently", it takes about an hour for it to download the 250M rows and load them onto the SSD tempspace. 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