{"id":16771,"date":"2021-11-08T12:59:15","date_gmt":"2021-11-08T11:59:15","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/postgresql-15-read-some-options-for-pg_dump-from-a-file\/"},"modified":"2021-11-08T12:59:15","modified_gmt":"2021-11-08T11:59:15","slug":"postgresql-15-read-some-options-for-pg_dump-from-a-file","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/postgresql-15-read-some-options-for-pg_dump-from-a-file\/","title":{"rendered":"PostgreSQL 15: read some options for pg_dump from a file"},"content":{"rendered":"<p>PostgreSQL 15 will probably come with a new feature for <a href=\"https:\/\/www.postgresql.org\/docs\/current\/app-pgdump.html\" target=\"_blank\" rel=\"noopener\">pg_dump<\/a>: Instead of passing the arguments\/options directly to pg_dump when it is executed, you may also use a file to describe what you want to export. In the Oracle world it was (maybe still is, but I don&#8217;t know) very popular to do that with traditional exp\/imp and the expdp\/impdp utilities. pg_dump did not know that feature but this will probably change for PostgreSQL 15. Currently the <a href=\"https:\/\/commitfest.postgresql.org\/35\/2573\/\" target=\"_blank\" rel=\"noopener\">patch is &#8220;ready for committer&#8221;<\/a> so we don&#8217;t really know if it finally will be committed, but I believe chances are not too bad. Let&#8217;s have a look.<\/p>\n<p><!--more--><\/p>\n<p>For being able to dump, we need some data:<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">\npostgres=# create schema s1;\nCREATE SCHEMA\npostgres=# create schema s2;\nCREATE SCHEMA\npostgres=# create table s1.t1 as select i as a, i::text as b, now() as c from generate_series(1,100) i;\nSELECT 100\npostgres=# create table s2.t2 as select i as a, i::text as b, now() as c from generate_series(1,100) i;\nSELECT 100\npostgres=# create view s1.v1 as select a from s1.t1;\nCREATE VIEW\npostgres=# create view s2.v2 as select b from s2.t2;\nCREATE VIEW\n<\/pre>\n<p>The new option for pg_dump is called:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\n  --filter=FILENAME            dump objects and data based on the filter expressions\n                               in specified file\n\n<\/pre>\n<p>Currently the following types of objects are supported: <\/p>\n<ul>\n<li>tables<\/li>\n<li>schemas<\/li>\n<li>foreign_data<\/li>\n<li>data<\/li>\n<\/ul>\n<p>The first two can be either &#8220;included&#8221; or &#8220;excluded&#8221;, foreign_data can only be &#8220;included&#8221; and data can only be excluded. If, for example, we want to dump the &#8220;s1&#8221; schema but we do not want to have the &#8220;s2&#8221; schema included we can do it like this:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\npostgres@debian11pg:\/home\/postgres\/ [pgdev] echo \"include schema s1\" &gt; filter.txt\npostgres@debian11pg:\/home\/postgres\/ [pgdev] echo \"exclude schema s2\" &gt;&gt; filter.txt\npostgres@debian11pg:\/home\/postgres\/ [pgdev] pg_dump --filter=filter.txt &gt; dmp.sql\npostgres@debian11pg:\/home\/postgres\/ [pgdev] grep s2 dmp.sql \n<\/pre>\n<p>Actually, for this requirement this would already be enough and the result is the same:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\npostgres@debian11pg:\/home\/postgres\/ [pgdev] echo \"include schema s1\" &gt; filter.txt\npostgres@debian11pg:\/home\/postgres\/ [pgdev] pg_dump --filter=filter.txt &gt; dmp.sql\npostgres@debian11pg:\/home\/postgres\/ [pgdev] grep s2 dmp.sql \n<\/pre>\n<p>For tables it works exactly the same:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\npostgres@debian11pg:\/home\/postgres\/ [pgdev] echo \"include table s1.t1\" &gt; filter.txt\npostgres@debian11pg:\/home\/postgres\/ [pgdev] pg_dump --filter=filter.txt &gt; dmp.sql\n<\/pre>\n<p>Getting only the meta data is possible by excluding the data from the dump:<\/p>\n<pre class=\"brush: bash; gutter: true; first-line: 1\">\npostgres@debian11pg:\/home\/postgres\/ [pgdev] cat filter.txt \ninclude schema s1\nexclude data s1.t1\npostgres@debian11pg:\/home\/postgres\/ [pgdev] pg_dump --filter=filter.txt &gt; dmp.sql\n<\/pre>\n<p>As I do not have a foreign data wrapper configured right now, I&#8217;ll skip this one, should be clear what it does. This for sure is not a killer feature but personally I always liked to work with options coming from files, and this is a good starting point.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>PostgreSQL 15 will probably come with a new feature for pg_dump: Instead of passing the arguments\/options directly to pg_dump when it is executed, you may also use a file to describe what you want to export. In the Oracle world it was (maybe still is, but I don&#8217;t know) very popular to do that with [&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-16771","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 15: read some options for pg_dump from a file - 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-15-read-some-options-for-pg_dump-from-a-file\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PostgreSQL 15: read some options for pg_dump from a file\" \/>\n<meta property=\"og:description\" content=\"PostgreSQL 15 will probably come with a new feature for pg_dump: Instead of passing the arguments\/options directly to pg_dump when it is executed, you may also use a file to describe what you want to export. 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