{"id":11349,"date":"2018-06-14T11:26:34","date_gmt":"2018-06-14T09:26:34","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/is-adding-a-column-to-a-typed-table-in-postgresql-instant\/"},"modified":"2018-06-14T11:26:34","modified_gmt":"2018-06-14T09:26:34","slug":"is-adding-a-column-to-a-typed-table-in-postgresql-instant","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/is-adding-a-column-to-a-typed-table-in-postgresql-instant\/","title":{"rendered":"Is adding a column to a typed table in PostgreSQL instant?"},"content":{"rendered":"<p>Today at the <a href=\"https:\/\/soug.ch\/events\/soug-day_14062018\/\" target=\"_blank\" rel=\"noopener\">SOUG Day<\/a> I did some little demos and one of them was about creating <a href=\"https:\/\/www.dbi-services.com\/blog\/what-are-typed-tables-in-postgresql\/\" target=\"_blank\" rel=\"noopener\">typed tables<\/a>. In the demo the two tables did not contain any rows and one of the questions was: When these tables contain a million of rows would adding a column be instant as well? Lets do a quick test.<\/p>\n<p><!--more--><\/p>\n<p>Same setup as in the post referenced above: Two schemas, one type, two tables based on the type:<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# select version();\n                                                          version                                                           \n----------------------------------------------------------------------------------------------------------------------------\n PostgreSQL 10.4 build on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-28), 64-bit\n(1 row)\npostgres=# create schema a;\nCREATE SCHEMA\npostgres=# create schema b;\nCREATE SCHEMA\npostgres=# create type typ1 as ( a int, b text );\nCREATE TYPE\npostgres=# create table a.t1 of typ1;\nCREATE TABLE\npostgres=# create table b.t1 of typ1;\nCREATE TABLE\npostgres=# insert into a.t1\npostgres-# select a.*\npostgres-#      , md5(a::text)\npostgres-#   from generate_series(1,1000000) a;\nINSERT 0 1000000\npostgres=# insert into b.t1 select * from a.t1;\nINSERT 0 1000000\npostgres=# \n<\/pre>\n<p>Both of the tables contain 1&#8217;000&#8217;000 rows so how much time would a modification of the type take?<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# timing\nTiming is on.\npostgres=# alter type typ1 add attribute c timestamp cascade;;\nALTER TYPE\nTime: 9.338 ms\nTime: 0.867 ms\npostgres=# d a.t1\n                             Table \"a.t1\"\n Column |            Type             | Collation | Nullable | Default \n--------+-----------------------------+-----------+----------+---------\n a      | integer                     |           |          | \n b      | text                        |           |          | \n c      | timestamp without time zone |           |          | \nTyped table of type: typ1\n\npostgres=# d b.t1\n                             Table \"b.t1\"\n Column |            Type             | Collation | Nullable | Default \n--------+-----------------------------+-----------+----------+---------\n a      | integer                     |           |          | \n b      | text                        |           |          | \n c      | timestamp without time zone |           |          | \nTyped table of type: typ1\n<\/pre>\n<p>Almost instant. Btw: Of course you can also remove an attribute from the type:<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# alter type typ1 drop attribute c cascade;\nALTER TYPE\nTime: 14.417 ms\npostgres=# d a.t1\n                   Table \"a.t1\"\n Column |  Type   | Collation | Nullable | Default \n--------+---------+-----------+----------+---------\n a      | integer |           |          | \n b      | text    |           |          | \nTyped table of type: typ1\n\npostgres=# d b.t1\n                   Table \"b.t1\"\n Column |  Type   | Collation | Nullable | Default \n--------+---------+-----------+----------+---------\n a      | integer |           |          | \n b      | text    |           |          | \nTyped table of type: typ1\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Today at the SOUG Day I did some little demos and one of them was about creating typed tables. In the demo the two tables did not contain any rows and one of the questions was: When these tables contain a million of rows would adding a column be instant as well? Lets do a [&hellip;]<\/p>\n","protected":false},"author":29,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229],"tags":[77],"type_dbi":[],"class_list":["post-11349","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","tag-postgresql"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Is adding a column to a typed table in PostgreSQL instant? - dbi Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/is-adding-a-column-to-a-typed-table-in-postgresql-instant\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Is adding a column to a typed table in PostgreSQL instant?\" \/>\n<meta property=\"og:description\" content=\"Today at the SOUG Day I did some little demos and one of them was about creating typed tables. In the demo the two tables did not contain any rows and one of the questions was: When these tables contain a million of rows would adding a column be instant as well? Lets do a [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dbi-services.com\/blog\/is-adding-a-column-to-a-typed-table-in-postgresql-instant\/\" \/>\n<meta property=\"og:site_name\" content=\"dbi Blog\" \/>\n<meta property=\"article:published_time\" content=\"2018-06-14T09:26:34+00:00\" \/>\n<meta name=\"author\" content=\"Daniel Westermann\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@westermanndanie\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Daniel Westermann\" \/>\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:\/\/www.dbi-services.com\/blog\/is-adding-a-column-to-a-typed-table-in-postgresql-instant\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/is-adding-a-column-to-a-typed-table-in-postgresql-instant\/\"},\"author\":{\"name\":\"Daniel Westermann\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/8d08e9bd996a89bd75c0286cbabf3c66\"},\"headline\":\"Is adding a column to a typed table in PostgreSQL instant?\",\"datePublished\":\"2018-06-14T09:26:34+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/is-adding-a-column-to-a-typed-table-in-postgresql-instant\/\"},\"wordCount\":117,\"commentCount\":0,\"keywords\":[\"PostgreSQL\"],\"articleSection\":[\"Database Administration &amp; Monitoring\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.dbi-services.com\/blog\/is-adding-a-column-to-a-typed-table-in-postgresql-instant\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/is-adding-a-column-to-a-typed-table-in-postgresql-instant\/\",\"url\":\"https:\/\/www.dbi-services.com\/blog\/is-adding-a-column-to-a-typed-table-in-postgresql-instant\/\",\"name\":\"Is adding a column to a typed table in PostgreSQL instant? - dbi Blog\",\"isPartOf\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#website\"},\"datePublished\":\"2018-06-14T09:26:34+00:00\",\"author\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/8d08e9bd996a89bd75c0286cbabf3c66\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/is-adding-a-column-to-a-typed-table-in-postgresql-instant\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.dbi-services.com\/blog\/is-adding-a-column-to-a-typed-table-in-postgresql-instant\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/is-adding-a-column-to-a-typed-table-in-postgresql-instant\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"https:\/\/www.dbi-services.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Is adding a column to a typed table in PostgreSQL instant?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#website\",\"url\":\"https:\/\/www.dbi-services.com\/blog\/\",\"name\":\"dbi Blog\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.dbi-services.com\/blog\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/8d08e9bd996a89bd75c0286cbabf3c66\",\"name\":\"Daniel Westermann\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/secure.gravatar.com\/avatar\/31350ceeecb1dd8986339a29bf040d4cd3cd087d410deccd8f55234466d6c317?s=96&d=mm&r=g\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/31350ceeecb1dd8986339a29bf040d4cd3cd087d410deccd8f55234466d6c317?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/31350ceeecb1dd8986339a29bf040d4cd3cd087d410deccd8f55234466d6c317?s=96&d=mm&r=g\",\"caption\":\"Daniel Westermann\"},\"description\":\"Daniel Westermann is Principal Consultant and Technology Leader Open Infrastructure at dbi services. He has more than 15 years of experience in management, engineering and optimization of databases and infrastructures, especially on Oracle and PostgreSQL. Since the beginning of his career, he has specialized in Oracle Technologies and is Oracle Certified Professional 12c and Oracle Certified Expert RAC\/GridInfra. Over time, Daniel has become increasingly interested in open source technologies, becoming \u201cTechnology Leader Open Infrastructure\u201d and PostgreSQL expert. \u00a0Based on community or EnterpriseDB tools, he develops and installs complex high available solutions with PostgreSQL. He is also a certified PostgreSQL Plus 9.0 Professional and a Postgres Advanced Server 9.4 Professional. He is a regular speaker at PostgreSQL conferences in Switzerland and Europe. Today Daniel is also supporting our customers on AWS services such as AWS RDS, database migrations into the cloud, EC2 and automated infrastructure management with AWS SSM (System Manager). He is a certified AWS Solutions Architect Professional. Prior to dbi services, Daniel was Management System Engineer at LC SYSTEMS-Engineering AG in Basel. Before that, he worked as Oracle Developper &amp;\u00a0Project Manager at Delta Energy Solutions AG in Basel (today Powel AG). Daniel holds a diploma in Business Informatics (DHBW, Germany). His branch-related experience mainly covers the pharma industry, the financial sector, energy, lottery and telecommunications.\",\"sameAs\":[\"https:\/\/x.com\/westermanndanie\"],\"url\":\"https:\/\/www.dbi-services.com\/blog\/author\/daniel-westermann\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Is adding a column to a typed table in PostgreSQL instant? - dbi Blog","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:\/\/www.dbi-services.com\/blog\/is-adding-a-column-to-a-typed-table-in-postgresql-instant\/","og_locale":"en_US","og_type":"article","og_title":"Is adding a column to a typed table in PostgreSQL instant?","og_description":"Today at the SOUG Day I did some little demos and one of them was about creating typed tables. 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He has more than 15 years of experience in management, engineering and optimization of databases and infrastructures, especially on Oracle and PostgreSQL. Since the beginning of his career, he has specialized in Oracle Technologies and is Oracle Certified Professional 12c and Oracle Certified Expert RAC\/GridInfra. Over time, Daniel has become increasingly interested in open source technologies, becoming \u201cTechnology Leader Open Infrastructure\u201d and PostgreSQL expert. \u00a0Based on community or EnterpriseDB tools, he develops and installs complex high available solutions with PostgreSQL. He is also a certified PostgreSQL Plus 9.0 Professional and a Postgres Advanced Server 9.4 Professional. He is a regular speaker at PostgreSQL conferences in Switzerland and Europe. Today Daniel is also supporting our customers on AWS services such as AWS RDS, database migrations into the cloud, EC2 and automated infrastructure management with AWS SSM (System Manager). He is a certified AWS Solutions Architect Professional. Prior to dbi services, Daniel was Management System Engineer at LC SYSTEMS-Engineering AG in Basel. Before that, he worked as Oracle Developper &amp;\u00a0Project Manager at Delta Energy Solutions AG in Basel (today Powel AG). Daniel holds a diploma in Business Informatics (DHBW, Germany). His branch-related experience mainly covers the pharma industry, the financial sector, energy, lottery and telecommunications.","sameAs":["https:\/\/x.com\/westermanndanie"],"url":"https:\/\/www.dbi-services.com\/blog\/author\/daniel-westermann\/"}]}},"_links":{"self":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/posts\/11349","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/users\/29"}],"replies":[{"embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/comments?post=11349"}],"version-history":[{"count":0,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/posts\/11349\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/media?parent=11349"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/categories?post=11349"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/tags?post=11349"},{"taxonomy":"type","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/type_dbi?post=11349"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}