{"id":11045,"date":"2018-03-23T16:00:29","date_gmt":"2018-03-23T15:00:29","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/updating-the-partition-key-now-works-in-postgresql-11\/"},"modified":"2018-03-23T16:00:29","modified_gmt":"2018-03-23T15:00:29","slug":"updating-the-partition-key-now-works-in-postgresql-11","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/updating-the-partition-key-now-works-in-postgresql-11\/","title":{"rendered":"Updating the partition key now works in PostgreSQL 11"},"content":{"rendered":"<p>In the last post about <a href=\"https:\/\/www.dbi-services.com\/blog\/local-partitioned-indexes-in-postgresql-11\/\" target=\"_blank\" rel=\"noopener\">partitioning improvements in PostgreSQL 11<\/a> we talked about unique indexes and primary keys on partitioned tables. Both did not work in PostgreSQL 10 but now do in PostgreSQL 11. Another operation that did not work in PostgreSQL 10 and does now in PostgreSQL 11 is: Updating the partition key, which means that a row will move from one partition to another. Lets have a look at that.<\/p>\n<p><!--more--><\/p>\n<p>We&#8217;ll use the same little list partitioned table as in the  <a href=\"https:\/\/www.dbi-services.com\/blog\/local-partitioned-indexes-in-postgresql-11\/\" target=\"_blank\" rel=\"noopener\">last post<\/a> and start with PostgreSQL 10:<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# select version();\n                                                          version                                       Insert                     \n----------------------------------------------------------------------------------------------------------------------------\n PostgreSQL 10.0 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-16), 64-bit\n(1 row)\n\npostgres=# create table part ( a int, list varchar(5) ) partition by list (list);\nCREATE TABLE\npostgres=# create table part_1 partition of part for values in ('beer');\nCREATE TABLE\npostgres=# create table part_2 partition of part for values in ('wine');\nCREATE TABLE\npostgres=# d+ part\n                                          Table \"public.part\"\n Column |         Type         | Collation | Nullable | Default | Storage  | Stats target | Description \n--------+----------------------+-----------+----------+---------+----------+--------------+-------------\n a      | integer              |           |          |         | plain    |              | \n list   | character varying(5) |           |          |         | extended |              | \nPartition key: LIST (list)\nPartitions: part_1 FOR VALUES IN ('beer'),\n            part_2 FOR VALUES IN ('wine')\n<\/pre>\n<p>Insert some data:<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# insert into part (a,list) select i,'beer' from generate_series(1,10) i;\nINSERT 0 10\npostgres=# insert into part (a,list) select i,'wine' from generate_series(11,20) i;\nINSERT 0 10\n<\/pre>\n<p>So we have ten beers and ten wines.<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# select count(*) from only part_1;\n count \n-------\n    10\n(1 row)\n\npostgres=# select count(*) from only part_2;\n count \n-------\n    10\n(1 row)\n<\/pre>\n<p>What happens if we update the partition key because we like more beer than wine in PostgreSQL 10?<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# update part set list = 'beer' where a = 15;\nERROR:  new row for relation \"part_2\" violates partition constraint\nDETAIL:  Failing row contains (15, beer).\n<\/pre>\n<p>Not so good. Lets try the same in PostgreSQL 11:<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# select version();\n                                                  version                                                   \n------------------------------------------------------------------------------------------------------------\n PostgreSQL 11devel on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-16), 64-bit\n(1 row)\n\npostgres=# create table part ( a int, list varchar(5) ) partition by list (list);\nCREATE TABLE\npostgres=# create table part_1 partition of part for values in ('beer');\nCREATE TABLE\npostgres=# create table part_2 partition of part for values in ('wine');\nCREATE TABLE\npostgres=# insert into part (a,list) select i,'beer' from generate_series(1,10) i;\nINSERT 0 10\npostgres=# insert into part (a,list) select i,'wine' from generate_series(11,20) i;\nINSERT 0 10\npostgres=# update part set list = 'beer' where a = 15;\nUPDATE 1\n<\/pre>\n<p>Excellent, just works.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the last post about partitioning improvements in PostgreSQL 11 we talked about unique indexes and primary keys on partitioned tables. Both did not work in PostgreSQL 10 but now do in PostgreSQL 11. Another operation that did not work in PostgreSQL 10 and does now in PostgreSQL 11 is: Updating the partition key, which [&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-11045","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>Updating the partition key now works in PostgreSQL 11 - 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\/updating-the-partition-key-now-works-in-postgresql-11\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Updating the partition key now works in PostgreSQL 11\" \/>\n<meta property=\"og:description\" content=\"In the last post about partitioning improvements in PostgreSQL 11 we talked about unique indexes and primary keys on partitioned tables. 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