{"id":72265,"date":"2020-03-03T08:42:17","date_gmt":"2020-03-03T05:42:17","guid":{"rendered":"https:\/\/prohoster.info\/blog\/postgresql-antipatterns-menyaem-dannye-v-obhod-triggera"},"modified":"2020-03-03T16:13:51","modified_gmt":"2020-03-03T13:13:51","slug":"postgresql-antipatterns-menyaem-dannye-v-obhod-triggera","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/administrirovanie\/postgresql-antipatterns-menyaem-dannye-v-obhod-triggera","title":{"rendered":"PostgreSQL Antipatterns: men\u00edme d\u00e1ta obch\u00e1dzaj\u00faci sp\u00fa\u0161\u0165a\u010d","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>R\u00e1no alebo nesk\u00f4r sa mnoh\u00ed stret\u00e1vaj\u00fa s potrebou hromadne upravi\u0165 z\u00e1znamy v tabu\u013eke. U\u017e som <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/post\/481610\/\">rozpr\u00e1val, ako to robi\u0165 najlep\u0161ie<\/a><\/noindex>, a ako \u2014 rad\u0161ej nie. Dnes sa podel\u00edm o druh\u00fd aspekt hromadn\u00e9ho aktualizovania \u2014 <b>o aktiv\u00e1cii sp\u00fa\u0161\u0165ac\u00edch mechanizmov.<\/b>.<\/p>\n<p>Napr\u00edklad na tabu\u013eke, v ktorej treba nie\u010do opravi\u0165, vis\u00ed nepr\u00edjemn\u00e1 sp\u00fa\u0161\u0165 <code>ON UPDATE<\/code>, ktor\u00e1 pres\u00fava v\u0161etky zmeny do nejak\u00fdch agreg\u00e1tov. A vy potrebujete v\u0161etko aktualizova\u0165 (nov\u00e9 pole inicializova\u0165, napr\u00edklad) tak opatrne, aby sa tie agreg\u00e1ty nedotkli.<\/p>\n<h2>Jednoducho vypnime sp\u00fa\u0161\u0165a\u010de!<\/h2>\n<p><\/p>\n<pre><code class=\"sql\">BEGIN;\n  ALTER TABLE ... DISABLE TRIGGER ...;\n  UPDATE ...; -- tu dlho\n  ALTER TABLE ... ENABLE TRIGGER ...;\nCOMMIT;<\/code><\/pre>\n<p>\nVlastne, to je v\u0161etko \u2014 <b>v\u0161etko u\u017e vis\u00ed.<\/b>.<\/p>\n<p>Preto\u017ee <code>ALTER TABLE<\/code> AccessExclusive <b>-z\u00e1mok<\/b>-blokovanie, pod ktor\u00fdm nikto paralelne vykon\u00e1vaj\u00faci, ani jednoduch\u00e9 <code>SELECT<\/code>, ni\u010d z tabu\u013eky pre\u010d\u00edta\u0165 nem\u00f4\u017ee. To znamen\u00e1, \u017ee pokia\u013e t\u00e1to transakcia neskon\u010d\u00ed, v\u0161etci zainteresovan\u00ed aj \u201elen si pre\u010d\u00edta\u0165\u201c bud\u00fa \u010daka\u0165. A pam\u00e4t\u00e1me, \u017ee <code>UPDATE<\/code> m\u00e1me dlh\u00fa\u2026<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h4>Tak\u017ee r\u00fdchlo vypnime, potom r\u00fdchlo zapneme!<\/h4>\n<p><\/p>\n<pre><code class=\"sql\">BEGIN;\n  ALTER TABLE ... DISABLE TRIGGER ...;\nCOMMIT;\n\nUPDATE ...;\n\nBEGIN;\n  ALTER TABLE ... ENABLE TRIGGER ...;\nCOMMIT;<\/code><\/pre>\n<p>\nTu je situ\u00e1cia u\u017e lep\u0161ia, \u010das \u010dakania je podstatne krat\u0161\u00ed. Ale iba dve probl\u00e9my kazia cel\u00fa kr\u00e1su:<\/p>\n<ul>\n<li><code>ALTER TABLE<\/code> s\u00e1m sa \u010dak\u00e1 na v\u0161etky ostatn\u00e9 oper\u00e1cie na tabu\u013eke, vr\u00e1tane dlh\u00fdch. <code>SELECT<\/code><\/li>\n<li>K\u00fdm je sp\u00fa\u0161\u0165a\u010d vypnut\u00fd, <b>\u201eprebehne popri\u201c ak\u00e1ko\u013evek zmena<\/b> v tabu\u013eke, aj ke\u010f nie na\u0161a. A do agreg\u00e1tov sa jednoducho nedostane, hoci by mala. Probl\u00e9m!<\/li>\n<\/ul>\n<p><\/p>\n<h2>Spr\u00e1va premenn\u00fdch rel\u00e1cie<\/h2>\n<p>\nTak\u017ee, v predch\u00e1dzaj\u00facej variante sme narazili na z\u00e1sadn\u00fd moment \u2014 treba nejak\u00fdm sp\u00f4sobom nau\u010di\u0165 sp\u00fa\u0161\u0165a\u010d rozli\u0161ova\u0165 \u201ena\u0161e\u201c zmeny v tabu\u013eke od \u201ene na\u0161ich\u201c. \u201eNa\u0161e\u201c necha\u0165 ako s\u00fa, a na \u201ene na\u0161e\u201c \u2014 reagova\u0165. Na tento \u00fa\u010del m\u00f4\u017eeme vyu\u017ei\u0165 <noindex><a rel=\"nofollow\" href=\"https:\/\/postgrespro.ru\/docs\/postgresql\/12\/runtime-config-client\">premenn\u00e9 rel\u00e1cie<\/a><\/noindex>.<\/p>\n<h4>session_replication_role<\/h4>\n<p>\n\u010c\u00edtame <noindex><a rel=\"nofollow\" href=\"https:\/\/postgrespro.ru\/docs\/postgresql\/12\/sql-altertable\">pr\u00edru\u010dku<\/a><\/noindex>:<\/p>\n<blockquote><p>Na mechanizmus aktiv\u00e1cie sp\u00fa\u0161\u0165a\u010dov tie\u017e vpl\u00fdva konfigura\u010dn\u00e1 premenn\u00e1 <noindex><a rel=\"nofollow\" href=\"https:\/\/postgrespro.ru\/docs\/postgresql\/12\/runtime-config-client#GUC-SESSION-REPLICATION-ROLE\">session_replication_role<\/a><\/noindex>. Sp\u00fa\u0161\u0165a\u010de, ktor\u00e9 s\u00fa zapnut\u00e9 bez dodato\u010dn\u00fdch pokynov (predvolene), bud\u00fa fungova\u0165, ke\u010f je \u00faloha replik\u00e1cie \u2014 \u201eorigin\u201c (predvolene) alebo \u201elocal\u201c. Sp\u00fa\u0161\u0165a\u010de zapnut\u00e9 s pokynom <code>ENABLE REPLICA<\/code>, bud\u00fa fungova\u0165 iba ak <b>aktu\u00e1lny re\u017eim rel\u00e1cie<\/b> \u2014 \u201ereplica\u201c, a sp\u00fa\u0161\u0165a\u010de zapnut\u00e9 s pokynom <code>ENABLE ALWAYS<\/code>, bud\u00fa fungova\u0165 nez\u00e1visle od aktu\u00e1lneho re\u017eimu replik\u00e1cie.<\/p><\/blockquote>\n<p>Osobitne pod\u010diarkujem, \u017ee nastavenie sa net\u00fdka v\u0161etk\u00fdch naraz, ako <code>ALTER TABLE<\/code>, ale iba do na\u0161ej \u0161peci\u00e1lnej pripojenia. Tak\u017ee, aby sa nespustili \u017eiadne aplika\u010dn\u00e9 sp\u00fa\u0161\u0165a\u010de:<\/p>\n<pre><code class=\"sql\">SET session_replication_role = replica; -- vypnuli sme sp\u00fa\u0161\u0165a\u010de\nUPDATE ...;\nSET session_replication_role = DEFAULT; -- vr\u00e1tili sme do p\u00f4vodn\u00e9ho stavu<\/code><\/pre>\n<p><\/p>\n<h4>Podmienka v r\u00e1mci sp\u00fa\u0161\u0165a\u010da<\/h4>\n<p>\nAle uveden\u00e1 varianta funguje pre v\u0161etky sp\u00fa\u0161\u0165a\u010de naraz (alebo je potrebn\u00e9 \u201ealterova\u0165\u201c vopred sp\u00fa\u0161\u0165a\u010de, ktor\u00e9 nechceme vyp\u00edna\u0165). A ak potrebujeme <b>vypn\u00fa\u0165 jeden konkr\u00e9tny sp\u00fa\u0161\u0165a\u010d<\/b>?<\/p>\n<p>S t\u00fdmto n\u00e1m pom\u00f4\u017ee <noindex><a rel=\"nofollow\" href=\"https:\/\/postgrespro.ru\/docs\/postgresql\/12\/runtime-config-custom\">u\u017e\u00edvate\u013esk\u00e1 premenn\u00e1 rel\u00e1cie<\/a><\/noindex>:<\/p>\n<blockquote><p>N\u00e1zvy parametrov roz\u0161\u00edren\u00ed s\u00fa zapisovan\u00e9 nasledovne: n\u00e1zov roz\u0161\u00edrenia, bodka a potom vlastne n\u00e1zov parametra, podobne ako \u00fapln\u00e9 n\u00e1zvy objektov v SQL. Napr\u00edklad: plpgsql.variable_conflict.<br \/>\nPreto\u017ee nevlastn\u00e9 parametre m\u00f4\u017eu by\u0165 nastaven\u00e9 v procesoch, ktor\u00e9 nena\u010d\u00edtavaj\u00fa zodpovedaj\u00faci modul roz\u0161\u00edrenia, PostgreSQL prij\u00edma <b>hodnoty pre ak\u00e9ko\u013evek n\u00e1zvy s dvoma komponentmi<\/b>.<\/p><\/blockquote>\n<p>Najprv uprav\u00edme sp\u00fa\u0161\u0165a\u010d, pribli\u017ene takto:<\/p>\n<pre><code class=\"sql\">BEGIN\n    -- proces konverzie m\u00f4\u017ee robi\u0165 v\u0161etko\n    IF current_setting('mycfg.my_table_convert_process') = 'TRUE' THEN\n        IF TG_OP IN ('INSERT', 'UPDATE') THEN\n            RETURN NEW;\n        ELSE\n            RETURN OLD;\n        END IF;\n    END IF;\n...<\/code><\/pre>\n<p>\nMimochodom, toto sa d\u00e1 urobi\u0165 \u201ena\u017eivo\u201c, bez blokovania, cez <code>CREATE OR REPLACE<\/code> pre sp\u00fa\u0161\u0165aciu funkciu. A potom v \u0161peci\u00e1lnom pripojen\u00ed nastav\u00edme \u201ena\u0161u\u201c premenn\u00fa:<\/p>\n<pre><code class=\"sql\">\nSET mycfg.my_table_convert_process = 'TRUE';\nUPDATE ...;\nSET mycfg.my_table_convert_process = ''; -- vr\u00e1tili sme do p\u00f4vodn\u00e9ho stavu\n<\/code><\/pre>\n<p>\nPozn\u00e1te in\u00e9 sp\u00f4soby? Pode\u013ete sa o ne v koment\u00e1roch.<br \/>\n<br \/>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/tensor\/blog\/489900\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u0430\u043d\u043e \u0438\u043b\u0438 \u043f\u043e\u0437\u0434\u043d\u043e \u043c\u043d\u043e\u0433\u0438\u0435 \u0441\u0442\u0430\u043b\u043a\u0438\u0432\u0430\u044e\u0442\u0441\u044f \u0441 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e\u0441\u0442\u044c\u044e \u0447\u0442\u043e-\u0442\u043e \u043c\u0430\u0441\u0441\u043e\u0432\u043e \u0438\u0441\u043f\u0440\u0430\u0432\u0438\u0442\u044c \u0432 \u0437\u0430\u043f\u0438\u0441\u044f\u0445 \u0442\u0430\u0431\u043b\u0438\u0446\u044b. \u042f \u0443\u0436\u0435 \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u044b\u0432\u0430\u043b, \u043a\u0430\u043a \u044d\u0442\u043e \u0434\u0435\u043b\u0430\u0442\u044c \u043b\u0443\u0447\u0448\u0435, \u0430 \u043a\u0430\u043a \u2014 \u043b\u0443\u0447\u0448\u0435 \u043d\u0435 \u0434\u0435\u043b\u0430\u0442\u044c. \u0421\u0435\u0433\u043e\u0434\u043d\u044f \u0440\u0430\u0441\u0441\u043a\u0430\u0436\u0443 \u043e \u0432\u0442\u043e\u0440\u043e\u043c \u0430\u0441\u043f\u0435\u043a\u0442\u0435 \u043c\u0430\u0441\u0441\u043e\u0432\u043e\u0433\u043e \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u2014 \u043e \u0441\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0442\u0440\u0438\u0433\u0433\u0435\u0440\u043e\u0432. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043d\u0430 \u0442\u0430\u0431\u043b\u0438\u0446\u0435, \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u0432\u0430\u043c \u043d\u0430\u0434\u043e \u0447\u0442\u043e-\u0442\u043e \u043f\u043e\u043f\u0440\u0430\u0432\u0438\u0442\u044c, \u0432\u0438\u0441\u0438\u0442 \u0437\u043b\u043e\u0431\u043d\u044b\u0439 \u0442\u0440\u0438\u0433\u0433\u0435\u0440 ON UPDATE, \u043f\u0435\u0440\u0435\u043d\u043e\u0441\u044f\u0449\u0438\u0439 \u0432\u0441\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0432 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-72265","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0420\u0430\u043d\u043e \u0438\u043b\u0438 \u043f\u043e\u0437\u0434\u043d\u043e \u043c\u043d\u043e\u0433\u0438\u0435 \u0441\u0442\u0430\u043b\u043a\u0438\u0432\u0430\u044e\u0442\u0441\u044f \u0441 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e\u0441\u0442\u044c\u044e \u0447\u0442\u043e-\u0442\u043e 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