{"id":510,"date":"2024-02-22T16:31:52","date_gmt":"2024-02-22T13:31:52","guid":{"rendered":"https:\/\/aristov.tech\/blog\/?p=510"},"modified":"2024-02-22T16:31:55","modified_gmt":"2024-02-22T13:31:55","slug":"jsonb-toast-in-postgresql","status":"publish","type":"post","link":"https:\/\/aristov.tech\/blog\/jsonb-toast-in-postgresql\/","title":{"rendered":"JSONB && TOAST in PostgreSQL"},"content":{"rendered":"\n

\u0412 \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0435\u0439 \u0441\u0442\u0430\u0442\u044c\u0435<\/a> \u043c\u044b \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u043b\u0438 \u043a\u0430\u043a \u0443\u0441\u0442\u0440\u043e\u0435\u043d TOAST.<\/p>\n\n\n\n

\u0421\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442 \u2013 \u0443\u0431\u0435\u0434\u0438\u0442\u044c\u0441\u044f, \u0447\u0442\u043e JSONB \u0432 TOAST \u0434\u043e\u0432\u043e\u043b\u044c\u043d\u043e \u043c\u0435\u0434\u043b\u0435\u043d\u043d\u044b\u0439 \u0438 \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d bloating. \u0421\u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u043c \u0442\u0430\u0431\u043b\u0438\u0446\u0443 10 \u0442\u044b\u0441\u044f\u0447 \u0441\u0442\u0440\u043e\u043a \u0438\u0437 JSONB \u043e\u0431\u044a\u0435\u043a\u0442\u043e\u0432 \u0440\u0430\u0437\u043c\u0435\u0440\u043e\u043c \u043f\u043e 10 \u0442\u044b\u0441\u044f\u0447 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432:<\/p>\n\n\n\n

\n

\\timing<\/p>\n\n\n\n

CREATE TABLE t AS<\/p>\n\n\n\n

SELECT i AS id, (SELECT jsonb_object_agg(j, j) FROM generate_series(1, 1000) j) js<\/p>\n\n\n\n

FROM generate_series(1, 10000) i;<\/p>\n<\/blockquote>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u041f\u043e\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043d\u0430 \u0440\u0430\u0437\u043c\u0435\u0440 \u0441\u0433\u0435\u043d\u0435\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445:<\/p>\n\n\n\n

\n

SELECT oid::regclass AS heap_rel,<\/p>\n\n\n\n

       pg_size_pretty(pg_relation_size(oid)) AS heap_rel_size,<\/p>\n\n\n\n

       reltoastrelid::regclass AS toast_rel,<\/p>\n\n\n\n

       pg_size_pretty(pg_relation_size(reltoastrelid)) AS toast_rel_size<\/p>\n\n\n\n

FROM pg_class WHERE relname = ‘t’;<\/p>\n<\/blockquote>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u0421\u0430\u043c\u0430 \u0442\u0430\u0431\u043b\u0438\u0446\u0430 \u0431\u0443\u0434\u0435\u0442 \u0437\u0430\u043d\u0438\u043c\u0430\u0442\u044c 512 \u041a\u0431, \u0430 \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0435 TOAST \u2014 78 \u041c\u0431. JSON \u0431\u0443\u0434\u0435\u0442 19 \u041a\u0431, \u0438 \u043e\u043d \u0441\u0436\u0438\u043c\u0430\u0435\u0442\u0441\u044f \u0432 6 \u041a\u0431, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0437\u0430\u0439\u043c\u0443\u0442 4 \u0447\u0430\u043d\u043a\u0430 \u0432 TOAST (\u0447\u0430\u043d\u043a\u0438 \u0440\u0430\u0437\u043c\u0435\u0440\u043e\u043c \u043f\u043e 2 \u041a\u0431 \u2013 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440 TOAST<\/strong><\/code>_<\/strong><\/code>MAX<\/strong><\/code>_<\/strong><\/code>CHUNK<\/strong><\/code>_<\/strong><\/code>SIZE<\/strong><\/code>).<\/p>\n\n\n\n

\u0414\u0430\u043b\u044c\u0448\u0435 \u0434\u0430\u0432\u0430\u0439\u0442\u0435 \u043f\u0440\u043e\u0430\u043f\u0434\u0435\u0439\u0442\u0438\u043c \u043a\u043e\u043b\u043e\u043d\u043a\u0443 id \u2014 \u043e\u043d\u0430 \u043c\u0430\u043b\u0435\u043d\u044c\u043a\u0430\u044f, \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u043e \u0438 \u043d\u0438\u043a\u043e\u0433\u0434\u0430 \u043d\u0435 \u043f\u043e\u043f\u0430\u0434\u0435\u0442 \u0432 TOAST, \u0437\u0430\u043e\u0434\u043d\u043e \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0438\u043c LpostgresqloSN<\/a> \u0436\u0443\u0440\u043d\u0430\u043b\u0430 WAL:<\/p>\n\n\n\n

\n

\\d+ t<\/p>\n\n\n\n

SELECT pg_current_wal_lsn();<\/p>\n<\/blockquote>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\n

UPDATE t SET id = id + 1;<\/p>\n\n\n\n

SELECT pg_current_wal_lsn();<\/p>\n<\/blockquote>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u0412\u0441\u0435\u0433\u043e 23 \u043c\u0441 \u0438 \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043d\u0430 \u0440\u0430\u0437\u043c\u0435\u0440 \u0441\u0433\u0435\u043d\u0435\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u0436\u0443\u0440\u043d\u0430\u043b\u0430 WAL:<\/p>\n\n\n\n

\n

SELECT pg_size_pretty(pg_wal_lsn_diff(‘0\/1FADE3B0′,’0\/1F96A060’)) AS wal_size;<\/p>\n<\/blockquote>\n\n\n\n

\"\"<\/figure>\n\n\n\n

WAL\u00a0 \u0431\u0443\u0434\u0435\u0442 \u0432\u0441\u0435\u0433\u043e 1,5 \u041c\u0431, \u0442\u043e \u0435\u0441\u0442\u044c 150 \u0431\u0430\u0439\u0442 \u043d\u0430 \u0437\u0430\u043f\u0438\u0441\u044c.<\/p>\n\n\n\n

\u041f\u0440\u0438 \u044d\u0442\u043e\u043c \u0440\u0430\u0437\u043c\u0435\u0440 TOAST \u043d\u0435 \u0438\u0437\u043c\u0435\u043d\u0438\u0442\u0441\u044f \u2014 \u043a\u0430\u043a \u0431\u044b\u043b 78 \u041c\u0431, \u0442\u0430\u043a \u0438 \u043e\u0441\u0442\u0430\u043d\u0435\u0442\u0441\u044f.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u0418 \u0442\u0435\u043f\u0435\u0440\u044c \u0434\u0430\u0432\u0430\u0439\u0442\u0435 \u043f\u0440\u043e\u0430\u043f\u0434\u0435\u0439\u0442\u0438\u043c JSON \u0438 \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043d\u0430 \u0441\u043a\u043e\u043a\u0440\u043e\u0441\u0442\u044c \u0438 \u0440\u0430\u0437\u043c\u0435\u0440 \u0436\u0443\u0440\u043d\u0430\u043b\u0430:<\/p>\n\n\n\n

\n

SELECT pg_current_wal_lsn();<\/p>\n\n\n\n

UPDATE t SET js = js::jsonb || ‘{«a»:1}’;<\/p>\n<\/blockquote>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\n

SELECT pg_current_wal_lsn();<\/p>\n\n\n\n

SELECT pg_size_pretty(pg_wal_lsn_diff(‘0\/26818180′,’0\/1FADE3B0’)) AS wal_size;<\/p>\n<\/blockquote>\n\n\n\n

\u042d\u0442\u043e \u0437\u0430\u0439\u043c\u0435\u0442 23 \u0441\u0435\u043a\u0443\u043d\u0434\u044b, \u0442\u043e \u0435\u0441\u0442\u044c \u0441\u0442\u0430\u043d\u0435\u0442 \u0432 1000 \u0440\u0430\u0437 \u043c\u0435\u0434\u043b\u0435\u043d\u043d\u0435\u0439<\/strong> (\u0432 \u0441\u0440\u0435\u0434\u043d\u0435\u043c \u043e\u0442 300 \u0434\u043e 500 \u0440\u0430\u0437), \u0430 \u0440\u0430\u0437\u043c\u0435\u0440\u00a0 WAL \u0443\u0432\u0435\u043b\u0438\u0447\u0438\u0442\u0441\u044f \u0434\u043e 106 \u041c\u0431 \u0432\u043c\u0435\u0441\u0442\u043e 1,5 \u041c\u0431.<\/p>\n\n\n\n

\u0425\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0435 TOAST \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0435\u043d\u043d\u043e \u0443\u0432\u0435\u043b\u0438\u0447\u0438\u043b\u043e\u0441\u044c \u0432 2 \u0440\u0430\u0437\u0430: <\/p>\n\n\n\n

\u0422\u043e \u0435\u0441\u0442\u044c, \u043c\u044b \u0441\u0434\u0435\u043b\u0430\u043b\u0438 \u043c\u0430\u043b\u0435\u043d\u044c\u043a\u0438\u0439 \u0430\u043f\u0434\u0435\u0439\u0442 \u0438 \u0443 \u043d\u0430\u0441 \u0441\u0440\u0430\u0437\u0443 \u0436\u0435 \u0432\u043e\u0437\u043d\u0438\u043a\u043b\u0438 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b.<\/p>\n\n\n\n

\u0418\u043c\u0435\u0435\u043c \u0440\u0430\u0441\u043f\u0443\u0445\u0430\u043d\u0438\u0435 \u2013 bloating. \u041f\u0440\u043e\u0441\u0442\u044b\u0435 \u043c\u0435\u0442\u043e\u0434\u044b \u0431\u043e\u0440\u044c\u0431\u044b \u0441 \u044d\u0442\u0438\u043c \u043d\u0435 \u043f\u043e\u043c\u043e\u0433\u0443\u0442, \u0442\u043e\u043b\u044c\u043a\u043e VACUUM<\/strong> <\/strong>FULL<\/strong>, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043d\u0435\u0440\u0435\u0430\u043b\u044c\u043d\u043e \u043f\u0440\u0438\u043c\u0435\u043d\u0438\u0442\u044c \u043d\u0430 \u0440\u0430\u0431\u043e\u0447\u0435\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0438\u0437-\u0437\u0430 \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043e\u043a. \u041a\u0430\u043a\u0438\u0435 \u0435\u0441\u0442\u044c \u0431\u043e\u043b\u0435\u0435 \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u044b\u0435 \u043c\u0435\u0442\u043e\u0434\u044b \u0431\u043e\u0440\u044c\u0431\u044b \u0441 bloating \u0440\u0430\u0437\u0431\u0435\u0440\u0451\u043c \u043d\u0430 \u043a\u0443\u0440\u0441\u0435.<\/p>\n\n\n\n

\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

\u0412 \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0435\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u043c\u044b \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u043b\u0438 \u043a\u0430\u043a \u0443\u0441\u0442\u0440\u043e\u0435\u043d TOAST. \u0421\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442 \u2013 \u0443\u0431\u0435\u0434\u0438\u0442\u044c\u0441\u044f, \u0447\u0442\u043e JSONB \u0432 TOAST \u0434\u043e\u0432\u043e\u043b\u044c\u043d\u043e \u043c\u0435\u0434\u043b\u0435\u043d\u043d\u044b\u0439 \u0438 \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d bloating. \u0421\u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u043c \u0442\u0430\u0431\u043b\u0438\u0446\u0443 10 \u0442\u044b\u0441\u044f\u0447 \u0441\u0442\u0440\u043e\u043a \u0438\u0437 JSONB \u043e\u0431\u044a\u0435\u043a\u0442\u043e\u0432 \u0440\u0430\u0437\u043c\u0435\u0440\u043e\u043c \u043f\u043e 10 \u0442\u044b\u0441\u044f\u0447 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432: \\timing CREATE TABLE t AS SELECT i AS id, (SELECT jsonb_object_agg(j, j) FROM generate_series(1, 1000) j) js FROM generate_series(1, 10000) i; […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12,11],"tags":[186,185,184,183,187,16,182],"class_list":["post-510","post","type-post","status-publish","format-standard","hentry","category-optimizacziya-postgresql","category-ustrojstvo-postgresql","tag-bloating","tag-jsonb","tag-longsequancenumber","tag-lsn","tag-pg_toast","tag-postgresql","tag-toast"],"yoast_head":"\nJSONB && TOAST in PostgreSQL - \u0411\u043b\u043e\u0433 \u043f\u043e \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u0435 \u0438 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438 PostgreSQL \u043e\u0442 \u0410\u0440\u0438\u0441\u0442\u043e\u0432\u0430 \u0415\u0432\u0433\u0435\u043d\u0438\u044f<\/title>\n<meta name=\"description\" content=\"\u0421\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442 \u2013 \u0443\u0431\u0435\u0434\u0438\u0442\u044c\u0441\u044f, \u0447\u0442\u043e JSONB \u0432 TOAST \u0434\u043e\u0432\u043e\u043b\u044c\u043d\u043e \u043c\u0435\u0434\u043b\u0435\u043d\u043d\u044b\u0439 \u0438 \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d bloating. \u0421\u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u043c \u0442\u0430\u0431\u043b\u0438\u0446\u0443 10 \u0442\u044b\u0441\u044f\u0447 \u0441\u0442\u0440\u043e\u043a \u0438\u0437 JSONB \u043e\u0431\u044a\u0435\u043a\u0442\u043e\u0432 \u0440\u0430\u0437\u043c\u0435\u0440\u043e\u043c \u043f\u043e 10 \u0442\u044b\u0441\u044f\u0447 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/aristov.tech\/blog\/jsonb-toast-in-postgresql\/\" \/>\n<meta property=\"og:locale\" content=\"ru_RU\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JSONB && TOAST in PostgreSQL - \u0411\u043b\u043e\u0433 \u043f\u043e \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u0435 \u0438 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438 PostgreSQL \u043e\u0442 \u0410\u0440\u0438\u0441\u0442\u043e\u0432\u0430 \u0415\u0432\u0433\u0435\u043d\u0438\u044f\" \/>\n<meta property=\"og:description\" content=\"\u0421\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442 \u2013 \u0443\u0431\u0435\u0434\u0438\u0442\u044c\u0441\u044f, \u0447\u0442\u043e JSONB \u0432 TOAST \u0434\u043e\u0432\u043e\u043b\u044c\u043d\u043e \u043c\u0435\u0434\u043b\u0435\u043d\u043d\u044b\u0439 \u0438 \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d bloating. \u0421\u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u043c \u0442\u0430\u0431\u043b\u0438\u0446\u0443 10 \u0442\u044b\u0441\u044f\u0447 \u0441\u0442\u0440\u043e\u043a \u0438\u0437 JSONB \u043e\u0431\u044a\u0435\u043a\u0442\u043e\u0432 \u0440\u0430\u0437\u043c\u0435\u0440\u043e\u043c \u043f\u043e 10 \u0442\u044b\u0441\u044f\u0447 \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u043e\u0432\" \/>\n<meta property=\"og:url\" content=\"https:\/\/aristov.tech\/blog\/jsonb-toast-in-postgresql\/\" \/>\n<meta property=\"og:site_name\" content=\"\u0411\u043b\u043e\u0433 \u043f\u043e \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u0435 \u0438 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438 PostgreSQL \u043e\u0442 \u0410\u0440\u0438\u0441\u0442\u043e\u0432\u0430 \u0415\u0432\u0433\u0435\u043d\u0438\u044f\" \/>\n<meta property=\"article:published_time\" content=\"2024-02-22T13:31:52+00:00\" 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