{"id":1094,"date":"2018-07-26T19:40:57","date_gmt":"2018-07-26T19:40:57","guid":{"rendered":"http:\/\/dbtut.com\/?p=1094"},"modified":"2018-11-08T14:01:47","modified_gmt":"2018-11-08T14:01:47","slug":"how-to-create-a-materialized-view-on-postgresql","status":"publish","type":"post","link":"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/","title":{"rendered":"How To Create a Materialized View On PostgreSQL"},"content":{"rendered":"

\n

By using Materialized Views in PostgreSQL, you can access data faster by physically holding the data in the view.<\/p>\n

I will go over an example and explain the details.<\/p>\n

In my example I will use the table I created in the article “How to Create a View in PostgreSQL<\/a>“.<\/p>\n

We create a materialized view with the help of the following script.<\/p>\n

With the WITH DATA statement you see at the end of the script, we are doing the loading operation on the materialized view.<\/p>\n

If you run the script WITH NO DATA, the view will be read only until you load the data into the view.<\/p>\n

CREATE MATERIALIZED VIEW materialized_view_example\r\nAS select * from table_example WITH DATA;<\/pre>\n
<\/p>\n
 <\/p>\n
After creating the Materialized View, we are querying as follows.<\/p>\n
select * from materialized_view_example;<\/pre>\n
<\/p>\n
 <\/p>\n
I will add a record to the original table and query the materialized view again to see what the result is.<\/p>\n
INSERT INTO table_example VALUES('Bruce Lee','San Francisco');<\/pre>\n
<\/p>\n
 <\/p>\n
As you can see, when we query the view, we can not see the recording we just added.<\/p>\n
We need to refresh the materialized view as follows to be able to see the changes.<\/p>\n
REFRESH MATERIALIZED VIEW CONCURENTLY materialized_view_example;<\/pre>\n
<\/p>\n
 <\/p>\n
We got an error like you saw it.<\/p>\n
ERROR:\u00a0 cannot refresh materialized view “public.materialized_view_example” concurrently<\/em><\/p>\n
HINT:\u00a0 Create a unique index with no WHERE clause on one or more columns of the materialized view.<\/em><\/p>\n
 <\/p>\n
To be able to REFRESH the materialized view we need to add a unique index.<\/p>\n
Add the unique index to the materialized view with the following script.<\/p>\n
CREATE UNIQUE INDEX ON materialized_view_example (name);<\/pre>\n
<\/p>\n
 <\/p>\n
And let’s refresh the materialized view again.<\/p>\n
<\/p>\n
 <\/p>\n
If you do not use the concurrently expression when creating the materialized view, you do not need to create a unique index.<\/p>\n
But when you refresh the materialied view, the source table is locked.<\/p>\n
You will see Bruce Lee in the results when you query again after you have refreshed the materialized view.<\/p>\n
<\/p>\n
 <\/p>\n
You can delete the materialized view as follows.<\/p>\n
DROP MATERIALIZED VIEW materialized_view_example;<\/pre>\n
<\/p>\n
 <\/p>\n
You may want to look at the following articles about Views.<\/p>\n
“How To Create a View On PostgreSQL<\/a>“,<\/p>\n
“How To Create a Recursive View On PostgreSQL<\/a>“,<\/p>\n
“How To Create an Updateable View On PostgreSQL<\/a>“,<\/p>\n
“How To Create an Updateable View WITH CHECK CONSTRAINT On PostgreSQL<\/a>”<\/p>\n
\n
<\/div>\n
<\/path><\/svg><\/i> \"Loading\"<\/p>\n
<\/div>\n","protected":false},"excerpt":{"rendered":"
By using Materialized Views in PostgreSQL, you can access data faster by physically holding the data in the view. I will go over an example and explain the details. In my example I will use the table I created in the article “How to Create a View in PostgreSQL“. We create a materialized view with …<\/p>\n
<\/div>\n
<\/path><\/svg><\/i> \"Loading\"<\/p>\n
<\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[5],"tags":[1222,1223,1226,1221,1218,1219,1174,1175,1225,1224,1220],"class_list":["post-1094","post","type-post","status-publish","format-standard","","category-postgres","tag-cannot-refresh-materialized-view","tag-create-a-unique-index-with-no-where-clause-on-one-or-more-columns-of-the-materialized-view","tag-create-materialized-view","tag-create-unique-index-on-materialized-view","tag-how-to-create-a-materialized-view-on-postgresql","tag-materialized-view-on-postgresql","tag-materialized-views-on-postgresql","tag-recursive-views-on-postgresql","tag-refresh-materialized-view","tag-refresh-materialized-view-concurently","tag-updateable-view"],"aioseo_notices":[],"a3_pvc":{"activated":true,"total_views":1656,"today_views":0},"yoast_head":"\nHow To Create a Materialized View On PostgreSQL - Database Tutorials<\/title>\n<meta name=\"description\" content=\"How To Create a Materialized View On PostgreSQL\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How To Create a Materialized View On PostgreSQL - Database Tutorials\" \/>\n<meta property=\"og:description\" content=\"How To Create a Materialized View On PostgreSQL\" \/>\n<meta property=\"og:url\" content=\"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/\" \/>\n<meta property=\"og:site_name\" content=\"Database Tutorials\" \/>\n<meta property=\"article:published_time\" content=\"2018-07-26T19:40:57+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2018-11-08T14:01:47+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/606.png\" \/>\n<meta name=\"author\" content=\"dbtut\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"dbtut\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/\"},\"author\":{\"name\":\"dbtut\",\"@id\":\"https:\/\/dbtut.com\/#\/schema\/person\/fc047c39e1e53dce28fc4253529ea408\"},\"headline\":\"How To Create a Materialized View On PostgreSQL\",\"datePublished\":\"2018-07-26T19:40:57+00:00\",\"dateModified\":\"2018-11-08T14:01:47+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/\"},\"wordCount\":364,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/dbtut.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/#primaryimage\"},\"thumbnailUrl\":\"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/606.png\",\"keywords\":[\"cannot refresh materialized view\",\"Create a unique index with no WHERE clause on one or more columns of the materialized view\",\"CREATE MATERIALIZED VIEW\",\"create unique index on materialized view\",\"How To Create a Materialized View On PostgreSQL\",\"Materialized View On PostgreSQL\",\"Materialized Views On PostgreSQL\",\"Recursive Views On PostgreSQL\",\"REFRESH MATERIALIZED VIEW\",\"REFRESH MATERIALIZED VIEW CONCURENTLY\",\"Updateable view\"],\"articleSection\":[\"PostgreSQL\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/\",\"url\":\"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/\",\"name\":\"How To Create a Materialized View On PostgreSQL - Database Tutorials\",\"isPartOf\":{\"@id\":\"https:\/\/dbtut.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/#primaryimage\"},\"thumbnailUrl\":\"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/606.png\",\"datePublished\":\"2018-07-26T19:40:57+00:00\",\"dateModified\":\"2018-11-08T14:01:47+00:00\",\"description\":\"How To Create a Materialized View On PostgreSQL\",\"breadcrumb\":{\"@id\":\"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/#primaryimage\",\"url\":\"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/606.png\",\"contentUrl\":\"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/606.png\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/dbtut.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"How To Create a Materialized View On PostgreSQL\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/dbtut.com\/#website\",\"url\":\"https:\/\/dbtut.com\/\",\"name\":\"Database Tutorials\",\"description\":\"MSSQL, Oracle, PostgreSQL, MySQL, MariaDB, DB2, Sybase, Teradata, Big Data, NOSQL, MongoDB, Couchbase, Cassandra, Windows, Linux\",\"publisher\":{\"@id\":\"https:\/\/dbtut.com\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/dbtut.com\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/dbtut.com\/#organization\",\"name\":\"dbtut\",\"url\":\"https:\/\/dbtut.com\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/dbtut.com\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/dbtut.com\/wp-content\/uploads\/2021\/02\/dbtutlogo.jpg\",\"contentUrl\":\"https:\/\/dbtut.com\/wp-content\/uploads\/2021\/02\/dbtutlogo.jpg\",\"width\":223,\"height\":36,\"caption\":\"dbtut\"},\"image\":{\"@id\":\"https:\/\/dbtut.com\/#\/schema\/logo\/image\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\/\/dbtut.com\/#\/schema\/person\/fc047c39e1e53dce28fc4253529ea408\",\"name\":\"dbtut\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/dbtut.com\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/c322c32021bf651d9e103b183963c479a9c9791ead0715f4348203496c39aa54?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/c322c32021bf651d9e103b183963c479a9c9791ead0715f4348203496c39aa54?s=96&d=mm&r=g\",\"caption\":\"dbtut\"},\"description\":\"We are a team with over 10 years of database management and BI experience. Our Expertises: Oracle, SQL Server, PostgreSQL, MySQL, MongoDB, Elasticsearch, Kibana, Grafana.\",\"sameAs\":[\"http:\/\/NurullahCAKIR\"],\"url\":\"https:\/\/dbtut.com\/index.php\/author\/dbtut\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"How To Create a Materialized View On PostgreSQL - Database Tutorials","description":"How To Create a Materialized View On PostgreSQL","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/","og_locale":"en_US","og_type":"article","og_title":"How To Create a Materialized View On PostgreSQL - Database Tutorials","og_description":"How To Create a Materialized View On PostgreSQL","og_url":"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/","og_site_name":"Database Tutorials","article_published_time":"2018-07-26T19:40:57+00:00","article_modified_time":"2018-11-08T14:01:47+00:00","og_image":[{"url":"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/606.png","type":"","width":"","height":""}],"author":"dbtut","twitter_card":"summary_large_image","twitter_misc":{"Written by":"dbtut","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/#article","isPartOf":{"@id":"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/"},"author":{"name":"dbtut","@id":"https:\/\/dbtut.com\/#\/schema\/person\/fc047c39e1e53dce28fc4253529ea408"},"headline":"How To Create a Materialized View On PostgreSQL","datePublished":"2018-07-26T19:40:57+00:00","dateModified":"2018-11-08T14:01:47+00:00","mainEntityOfPage":{"@id":"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/"},"wordCount":364,"commentCount":0,"publisher":{"@id":"https:\/\/dbtut.com\/#organization"},"image":{"@id":"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/#primaryimage"},"thumbnailUrl":"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/606.png","keywords":["cannot refresh materialized view","Create a unique index with no WHERE clause on one or more columns of the materialized view","CREATE MATERIALIZED VIEW","create unique index on materialized view","How To Create a Materialized View On PostgreSQL","Materialized View On PostgreSQL","Materialized Views On PostgreSQL","Recursive Views On PostgreSQL","REFRESH MATERIALIZED VIEW","REFRESH MATERIALIZED VIEW CONCURENTLY","Updateable view"],"articleSection":["PostgreSQL"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/","url":"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/","name":"How To Create a Materialized View On PostgreSQL - Database Tutorials","isPartOf":{"@id":"https:\/\/dbtut.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/#primaryimage"},"image":{"@id":"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/#primaryimage"},"thumbnailUrl":"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/606.png","datePublished":"2018-07-26T19:40:57+00:00","dateModified":"2018-11-08T14:01:47+00:00","description":"How To Create a Materialized View On PostgreSQL","breadcrumb":{"@id":"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/#primaryimage","url":"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/606.png","contentUrl":"http:\/\/dbtut.com\/wp-content\/uploads\/2018\/07\/606.png"},{"@type":"BreadcrumbList","@id":"https:\/\/dbtut.com\/index.php\/2018\/07\/26\/how-to-create-a-materialized-view-on-postgresql\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/dbtut.com\/"},{"@type":"ListItem","position":2,"name":"How To Create a Materialized View On PostgreSQL"}]},{"@type":"WebSite","@id":"https:\/\/dbtut.com\/#website","url":"https:\/\/dbtut.com\/","name":"Database Tutorials","description":"MSSQL, Oracle, PostgreSQL, MySQL, MariaDB, DB2, Sybase, Teradata, Big Data, NOSQL, MongoDB, Couchbase, Cassandra, Windows, Linux","publisher":{"@id":"https:\/\/dbtut.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/dbtut.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/dbtut.com\/#organization","name":"dbtut","url":"https:\/\/dbtut.com\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/dbtut.com\/#\/schema\/logo\/image\/","url":"https:\/\/dbtut.com\/wp-content\/uploads\/2021\/02\/dbtutlogo.jpg","contentUrl":"https:\/\/dbtut.com\/wp-content\/uploads\/2021\/02\/dbtutlogo.jpg","width":223,"height":36,"caption":"dbtut"},"image":{"@id":"https:\/\/dbtut.com\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/dbtut.com\/#\/schema\/person\/fc047c39e1e53dce28fc4253529ea408","name":"dbtut","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/dbtut.com\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/c322c32021bf651d9e103b183963c479a9c9791ead0715f4348203496c39aa54?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/c322c32021bf651d9e103b183963c479a9c9791ead0715f4348203496c39aa54?s=96&d=mm&r=g","caption":"dbtut"},"description":"We are a team with over 10 years of database management and BI experience. Our Expertises: Oracle, SQL Server, PostgreSQL, MySQL, MongoDB, Elasticsearch, Kibana, Grafana.","sameAs":["http:\/\/NurullahCAKIR"],"url":"https:\/\/dbtut.com\/index.php\/author\/dbtut\/"}]}},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/dbtut.com\/index.php\/wp-json\/wp\/v2\/posts\/1094","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dbtut.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dbtut.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dbtut.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dbtut.com\/index.php\/wp-json\/wp\/v2\/comments?post=1094"}],"version-history":[{"count":0,"href":"https:\/\/dbtut.com\/index.php\/wp-json\/wp\/v2\/posts\/1094\/revisions"}],"wp:attachment":[{"href":"https:\/\/dbtut.com\/index.php\/wp-json\/wp\/v2\/media?parent=1094"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dbtut.com\/index.php\/wp-json\/wp\/v2\/categories?post=1094"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dbtut.com\/index.php\/wp-json\/wp\/v2\/tags?post=1094"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}