{"id":1890,"date":"2024-11-18T08:21:37","date_gmt":"2024-11-18T04:51:37","guid":{"rendered":"https:\/\/mshaeri.com\/blog\/?p=1890"},"modified":"2026-07-08T22:31:23","modified_gmt":"2026-07-09T08:31:23","slug":"postgresql-function-errors-during-backup-and-restore","status":"publish","type":"post","link":"https:\/\/mshaeri.com\/blog\/postgresql-function-errors-during-backup-and-restore\/","title":{"rendered":"PostgreSQL Function Error During Backup and Restore"},"content":{"rendered":"\n<p>In a recent project, I encountered a frustrating issue while working with PostgreSQL. I had implemented a custom function that called another function <code>(ST_X)<\/code> as part of a table check constraint. Everything worked seamlessly\u2014until I needed to back up the database and restore it on a new server.<\/p>\n\n\n\n<p>When attempting to restore, I was ran into this error:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"bash\" class=\"language-bash\">function st_x(geometry) does not exist.\nHINT: No function matches the given name and argument types. You might need to add explicit type casts.\n\n<\/code><\/pre>\n\n\n\n<p>After hours of troubleshooting, I discovered the root of the problem. PostgreSQL\u2019s <code>pg_restore<\/code> utility sets the <code>search_path<\/code> to <code>pg_catalog<\/code> during the restoration process. This means that any custom functions relying on schema-qualified calls (like <code>ST_X<\/code> from <code>postgis<\/code>) fail to resolve, because they are not in the <code>pg_catalog<\/code> schema.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Solution<\/h3>\n\n\n\n<p>The solution was to explicitly set the <code>search_path<\/code> for the affected functions. By defining a specific search path for these functions, they would no longer rely on the calling session\u2019s <code>search_path<\/code>, avoiding potential conflicts and backup time error.<\/p>\n\n\n\n<p>Here\u2019s the command that resolved the issue:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"sql\" class=\"language-sql\">ALTER FUNCTION your_custom_function_name(geometry) SET search_path=public;<\/code><\/pre>\n\n\n\n<p>This ensures that the function always uses the correct schema (<code>public<\/code>) , and it remains unaffected by <code>pg_restore<\/code>&#8216;s default <code>search_path<\/code> setting of <code>pg_catalog<\/code>.<\/p>\n\n\n\n<p>If you\u2019re using custom functions, especially in constraints or triggers, consider setting their <code>search_path<\/code> explicitly. It\u2019s a simple step that can save hours of troubleshooting.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In a recent project, I encountered a frustrating issue while working with PostgreSQL. I had implemented a custom function that called another function (ST_X) as &hellip; <\/p>\n","protected":false},"author":1,"featured_media":1897,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,215,214],"tags":[248,255,256,257,250,252,253,254,263,247,249,251],"_links":{"self":[{"href":"https:\/\/mshaeri.com\/blog\/wp-json\/wp\/v2\/posts\/1890"}],"collection":[{"href":"https:\/\/mshaeri.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mshaeri.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mshaeri.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mshaeri.com\/blog\/wp-json\/wp\/v2\/comments?post=1890"}],"version-history":[{"count":5,"href":"https:\/\/mshaeri.com\/blog\/wp-json\/wp\/v2\/posts\/1890\/revisions"}],"predecessor-version":[{"id":2618,"href":"https:\/\/mshaeri.com\/blog\/wp-json\/wp\/v2\/posts\/1890\/revisions\/2618"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mshaeri.com\/blog\/wp-json\/wp\/v2\/media\/1897"}],"wp:attachment":[{"href":"https:\/\/mshaeri.com\/blog\/wp-json\/wp\/v2\/media?parent=1890"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mshaeri.com\/blog\/wp-json\/wp\/v2\/categories?post=1890"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mshaeri.com\/blog\/wp-json\/wp\/v2\/tags?post=1890"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}