{"id":15260,"date":"2020-11-27T15:52:40","date_gmt":"2020-11-27T14:52:40","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/postgresql-14-allow-cluster-vacuum-full-and-reindex-to-change-tablespace-on-the-fly\/"},"modified":"2020-11-27T15:52:40","modified_gmt":"2020-11-27T14:52:40","slug":"postgresql-14-allow-cluster-vacuum-full-and-reindex-to-change-tablespace-on-the-fly","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/postgresql-14-allow-cluster-vacuum-full-and-reindex-to-change-tablespace-on-the-fly\/","title":{"rendered":"PostgreSQL 14: Allow CLUSTER, VACUUM FULL and REINDEX to change tablespace on the fly"},"content":{"rendered":"<p>It is a common misunderstanding that <a href=\"https:\/\/www.postgresql.org\/docs\/current\/sql-vacuum.html\" target=\"_blank\" rel=\"noopener noreferrer\">VACUUM FULL<\/a> saves you from running out of disk space if you already have space pressure. Running a VACUUM FULL temporarily requires at least double the space, as the table (and the indexes on the table) get completely re-written. PostgreSQL 14 will probably come with a solution for that as <a href=\"https:\/\/www.postgresql.org\/message-id\/flat\/8a8f5f73-00d3-55f8-7583-1375ca8f6a91%40postgrespro.ru\" target=\"_blank\" rel=\"noopener noreferrer\">this patch<\/a> introduces the possibility to move relations from one tablespace to another, when either <a href=\"https:\/\/www.postgresql.org\/docs\/current\/sql-cluster.html\" target=\"_blank\" rel=\"noopener noreferrer\">CLUSTER<\/a>, VACUUM FULL or <a href=\"https:\/\/www.postgresql.org\/docs\/current\/sql-reindex.html\" target=\"_blank\" rel=\"noopener noreferrer\">REINDEX<\/a> is executed.<\/p>\n<p><!--more--><\/p>\n<p>As this is about moving relations from one tablespace to another we obviously need at least two tablespaces to play with:<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# ! mkdir \/var\/tmp\/tbs1\npostgres=# ! mkdir \/var\/tmp\/tbs2\npostgres=# create tablespace tbs1 location '\/var\/tmp\/tbs1';\nCREATE TABLESPACE\npostgres=# create tablespace tbs2 location '\/var\/tmp\/tbs2';\nCREATE TABLESPACE\npostgres=# db\n          List of tablespaces\n    Name    |  Owner   |   Location    \n------------+----------+---------------\n pg_default | postgres | \n pg_global  | postgres | \n tbs1       | postgres | \/var\/tmp\/tbs1\n tbs2       | postgres | \/var\/tmp\/tbs2\n(4 rows)\n<\/pre>\n<p>Lets assume we have a table in the first tablespace and we face space pressure on that file system:<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# create table t1 ( a int, b date ) tablespace tbs1;\nCREATE TABLE\npostgres=# insert into t1 select x, now() from generate_series(1,1000000) x;\nINSERT 0 1000000\n<\/pre>\n<p>Without that patch there is not much you can do, except for this (which blocks for the duration of the operation):<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# alter table t1 set tablespace tbs2;\nALTER TABLE\npostgres=# d t1\n                 Table \"public.t1\"\n Column |  Type   | Collation | Nullable | Default \n--------+---------+-----------+----------+---------\n a      | integer |           |          | \n b      | text    |           |          | \n c      | date    |           |          | \nTablespace: \"tbs2\"\n<\/pre>\n<p>This will move the files of that table to the new tablespace (but not the indexes). If you really want to get back the space on disk with &#8220;vacuum full&#8221; you can now do that:<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# vacuum (tablespace tbs1, full true)  t1;\nVACUUM\npostgres=# d t1\n                 Table \"public.t1\"\n Column |  Type   | Collation | Nullable | Default \n--------+---------+-----------+----------+---------\n a      | integer |           |          | \n b      | date    |           |          | \nTablespace: \"tbs1\"\n<\/pre>\n<p>The very same is possible with reindex:<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# create index i1 on t1 (a);\nCREATE INDEX\npostgres=# reindex (tablespace tbs2) index i1;\nREINDEX\n<\/pre>\n<p>&#8230; and cluster:<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# cluster (tablespace tbs1, index_tablespace tbs1) t1 using i1;\nCLUSTER\npostgres=# d t1\n                 Table \"public.t1\"\n Column |  Type   | Collation | Nullable | Default \n--------+---------+-----------+----------+---------\n a      | integer |           |          | \n b      | date    |           |          | \nIndexes:\n    \"i1\" btree (a) CLUSTER, tablespace \"tbs1\"\nTablespace: \"tbs1\"\n\npostgres=# \n<\/pre>\n<p>Nice.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>It is a common misunderstanding that VACUUM FULL saves you from running out of disk space if you already have space pressure. Running a VACUUM FULL temporarily requires at least double the space, as the table (and the indexes on the table) get completely re-written. PostgreSQL 14 will probably come with a solution for that [&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-15260","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>PostgreSQL 14: Allow CLUSTER, VACUUM FULL and REINDEX to change tablespace on the fly - 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\/postgresql-14-allow-cluster-vacuum-full-and-reindex-to-change-tablespace-on-the-fly\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PostgreSQL 14: Allow CLUSTER, VACUUM FULL and REINDEX to change tablespace on the fly\" \/>\n<meta property=\"og:description\" content=\"It is a common misunderstanding that VACUUM FULL saves you from running out of disk space if you already have space pressure. Running a VACUUM FULL temporarily requires at least double the space, as the table (and the indexes on the table) get completely re-written. PostgreSQL 14 will probably come with a solution for that [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dbi-services.com\/blog\/postgresql-14-allow-cluster-vacuum-full-and-reindex-to-change-tablespace-on-the-fly\/\" \/>\n<meta property=\"og:site_name\" content=\"dbi Blog\" \/>\n<meta property=\"article:published_time\" content=\"2020-11-27T14:52:40+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\/postgresql-14-allow-cluster-vacuum-full-and-reindex-to-change-tablespace-on-the-fly\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/postgresql-14-allow-cluster-vacuum-full-and-reindex-to-change-tablespace-on-the-fly\/\"},\"author\":{\"name\":\"Daniel Westermann\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/8d08e9bd996a89bd75c0286cbabf3c66\"},\"headline\":\"PostgreSQL 14: Allow CLUSTER, VACUUM FULL and REINDEX to change tablespace on the fly\",\"datePublished\":\"2020-11-27T14:52:40+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/postgresql-14-allow-cluster-vacuum-full-and-reindex-to-change-tablespace-on-the-fly\/\"},\"wordCount\":196,\"commentCount\":0,\"keywords\":[\"PostgreSQL\"],\"articleSection\":[\"Database Administration &amp; Monitoring\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.dbi-services.com\/blog\/postgresql-14-allow-cluster-vacuum-full-and-reindex-to-change-tablespace-on-the-fly\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/postgresql-14-allow-cluster-vacuum-full-and-reindex-to-change-tablespace-on-the-fly\/\",\"url\":\"https:\/\/www.dbi-services.com\/blog\/postgresql-14-allow-cluster-vacuum-full-and-reindex-to-change-tablespace-on-the-fly\/\",\"name\":\"PostgreSQL 14: Allow CLUSTER, VACUUM FULL and REINDEX to change tablespace on the fly - dbi Blog\",\"isPartOf\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#website\"},\"datePublished\":\"2020-11-27T14:52:40+00:00\",\"author\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/8d08e9bd996a89bd75c0286cbabf3c66\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/postgresql-14-allow-cluster-vacuum-full-and-reindex-to-change-tablespace-on-the-fly\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.dbi-services.com\/blog\/postgresql-14-allow-cluster-vacuum-full-and-reindex-to-change-tablespace-on-the-fly\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/postgresql-14-allow-cluster-vacuum-full-and-reindex-to-change-tablespace-on-the-fly\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"https:\/\/www.dbi-services.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"PostgreSQL 14: Allow CLUSTER, VACUUM FULL and REINDEX to change tablespace on the fly\"}]},{\"@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":"PostgreSQL 14: Allow CLUSTER, VACUUM FULL and REINDEX to change tablespace on the fly - 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\/postgresql-14-allow-cluster-vacuum-full-and-reindex-to-change-tablespace-on-the-fly\/","og_locale":"en_US","og_type":"article","og_title":"PostgreSQL 14: Allow CLUSTER, VACUUM FULL and REINDEX to change tablespace on the fly","og_description":"It is a common misunderstanding that VACUUM FULL saves you from running out of disk space if you already have space pressure. 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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\/15260","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=15260"}],"version-history":[{"count":0,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/posts\/15260\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/media?parent=15260"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/categories?post=15260"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/tags?post=15260"},{"taxonomy":"type","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/type_dbi?post=15260"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}