{"id":37769,"date":"2025-03-20T10:31:49","date_gmt":"2025-03-20T09:31:49","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/?p=37769"},"modified":"2025-03-20T10:31:52","modified_gmt":"2025-03-20T09:31:52","slug":"postgresql-18-add-missing-stats-only-to-vacuumdb","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/postgresql-18-add-missing-stats-only-to-vacuumdb\/","title":{"rendered":"PostgreSQL 18: Add &#8220;&#8211;missing-stats-only&#8221; to vacuumdb"},"content":{"rendered":"\n<p>Loosing all the object statistics after a major version upgrade of PostgreSQL with <a href=\"https:\/\/www.postgresql.org\/docs\/current\/pgupgrade.html\">pg_upgrade<\/a> is one of the real paint points in PostgreSQL. Collecting\/generating the statistics can take much longer than the actual upgrade which is quite painful. A first the to resolve this was already committed for PostgreSQL 18 and I&#8217;ve written about this <a href=\"https:\/\/www.dbi-services.com\/blog\/postgresql-18-tweaking-relation-statistics\/\" target=\"_blank\" rel=\"noreferrer noopener\">here<\/a>. Yesterday, another bit was committed in this area, and this time it is <a href=\"https:\/\/www.postgresql.org\/docs\/current\/app-vacuumdb.html\">vacuumdb<\/a> which got a new switch.<\/p>\n\n\n\n<p>Before we can take a look at this we need an object without any statistics and an object which already has statistics::<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: sql; highlight: [1,3,5,7]; title: ; notranslate\" title=\"\">\npostgres=# create table t ( a int, b text );\nCREATE TABLE\npostgres=# create table tt ( a int, b text );\nCREATE TABLE\npostgres=# insert into t select i, &#039;aaa&#039; from generate_series(1,10) i;\nINSERT 0 100\npostgres=# insert into tt select i, &#039;aaa&#039; from generate_series(1,1000000) i;\nINSERT 0 1000000\n<\/pre><\/div>\n\n\n<p>The first insert will not trigger statistics collection, while second insert will trigger it:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: sql; highlight: [1]; title: ; notranslate\" title=\"\">\npostgres=# select relname, last_autoanalyze from pg_stat_all_tables where relname in (&#039;t&#039;,&#039;tt&#039;);\n relname |       last_autoanalyze        \n---------+-------------------------------\n tt      | 2025-03-20 10:18:03.745504+01\n t       | \n(2 rows)\n<\/pre><\/div>\n\n\n<p>What the new switch for vacuumdb is providing, is to only collect statistics on objects which do not have any:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: bash; highlight: [1]; title: ; notranslate\" title=\"\">\npostgres@pgbox:\/home\/postgres\/ &#x5B;pgdev] vacuumdb --help | grep missing\n      --missing-stats-only        only analyze relations with missing statistics\n<\/pre><\/div>\n\n\n<p>Using that, we should see fresh statistics on the first table, but not on the second one:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\npostgres@pgbox:\/home\/postgres\/ &#x5B;pgdev] vacuumdb --analyze-only --missing-stats-only postgres\nvacuumdb: vacuuming database &quot;postgres&quot;\npostgres@pgbox:\/home\/postgres\/ &#x5B;pgdev] psql -c &quot;select relname, last_analyze from pg_stat_all_tables where relname in (&#039;t&#039;,&#039;tt&#039;);&quot;\n relname |         last_analyze         \n---------+------------------------------\n tt      | \n t       | 2025-03-20 10:24:36.88391+01\n(2 rows)\n<\/pre><\/div>\n\n\n<p>Nice. All the details <a href=\"https:\/\/git.postgresql.org\/gitweb\/?p=postgresql.git;a=commitdiff;h=edba754f052ea0c02287080004aa6051eaa4f597\" target=\"_blank\" rel=\"noreferrer noopener\">here<\/a> and, as usual, thanks to everybody involved in this.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Loosing all the object statistics after a major version upgrade of PostgreSQL with pg_upgrade is one of the real paint points in PostgreSQL. Collecting\/generating the statistics can take much longer than the actual upgrade which is quite painful. A first the to resolve this was already committed for PostgreSQL 18 and I&#8217;ve written about this [&hellip;]<\/p>\n","protected":false},"author":29,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229,198],"tags":[77],"type_dbi":[],"class_list":["post-37769","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","category-database-management","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 18: Add &quot;-missing-stats-only&quot; to vacuumdb - 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-18-add-missing-stats-only-to-vacuumdb\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PostgreSQL 18: Add &quot;--missing-stats-only&quot; to vacuumdb\" \/>\n<meta property=\"og:description\" content=\"Loosing all the object statistics after a major version upgrade of PostgreSQL with pg_upgrade is one of the real paint points in PostgreSQL. Collecting\/generating the statistics can take much longer than the actual upgrade which is quite painful. A first the to resolve this was already committed for PostgreSQL 18 and I&#8217;ve written about this [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dbi-services.com\/blog\/postgresql-18-add-missing-stats-only-to-vacuumdb\/\" \/>\n<meta property=\"og:site_name\" content=\"dbi Blog\" \/>\n<meta property=\"article:published_time\" content=\"2025-03-20T09:31:49+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-03-20T09:31:52+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=\"1 minute\" \/>\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-18-add-missing-stats-only-to-vacuumdb\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/postgresql-18-add-missing-stats-only-to-vacuumdb\/\"},\"author\":{\"name\":\"Daniel Westermann\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/8d08e9bd996a89bd75c0286cbabf3c66\"},\"headline\":\"PostgreSQL 18: Add &#8220;&#8211;missing-stats-only&#8221; to vacuumdb\",\"datePublished\":\"2025-03-20T09:31:49+00:00\",\"dateModified\":\"2025-03-20T09:31:52+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/postgresql-18-add-missing-stats-only-to-vacuumdb\/\"},\"wordCount\":169,\"commentCount\":0,\"keywords\":[\"PostgreSQL\"],\"articleSection\":[\"Database Administration &amp; Monitoring\",\"Database management\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.dbi-services.com\/blog\/postgresql-18-add-missing-stats-only-to-vacuumdb\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/postgresql-18-add-missing-stats-only-to-vacuumdb\/\",\"url\":\"https:\/\/www.dbi-services.com\/blog\/postgresql-18-add-missing-stats-only-to-vacuumdb\/\",\"name\":\"PostgreSQL 18: Add \\\"-missing-stats-only\\\" to vacuumdb - dbi Blog\",\"isPartOf\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#website\"},\"datePublished\":\"2025-03-20T09:31:49+00:00\",\"dateModified\":\"2025-03-20T09:31:52+00:00\",\"author\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/8d08e9bd996a89bd75c0286cbabf3c66\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/postgresql-18-add-missing-stats-only-to-vacuumdb\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.dbi-services.com\/blog\/postgresql-18-add-missing-stats-only-to-vacuumdb\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/postgresql-18-add-missing-stats-only-to-vacuumdb\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"https:\/\/www.dbi-services.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"PostgreSQL 18: Add &#8220;&#8211;missing-stats-only&#8221; to vacuumdb\"}]},{\"@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 18: Add \"-missing-stats-only\" to vacuumdb - 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-18-add-missing-stats-only-to-vacuumdb\/","og_locale":"en_US","og_type":"article","og_title":"PostgreSQL 18: Add \"--missing-stats-only\" to vacuumdb","og_description":"Loosing all the object statistics after a major version upgrade of PostgreSQL with pg_upgrade is one of the real paint points in PostgreSQL. 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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\/37769","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=37769"}],"version-history":[{"count":2,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/posts\/37769\/revisions"}],"predecessor-version":[{"id":37771,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/posts\/37769\/revisions\/37771"}],"wp:attachment":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/media?parent=37769"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/categories?post=37769"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/tags?post=37769"},{"taxonomy":"type","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/type_dbi?post=37769"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}