{"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":28,"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 v28.8 (Yoast SEO v28.8) - 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. 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