{"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\/pl\/blog\/administrirovanie\/postgresql-antipatterns-menyaem-dannye-v-obhod-triggera","title":{"rendered":"PostgreSQL Antipatterns: zmiana danych omijaj\u0105c wyzwalacz","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Pr\u0119dzej czy p\u00f3\u017aniej wielu u\u017cytkownik\u00f3w staje w obliczu potrzeby masowej edycji rekord\u00f3w w tabeli. Ju\u017c wcze\u015bniej <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/post\/481610\/\">opowiada\u0142em, jak to zrobi\u0107 lepiej<\/a><\/noindex>, a jak \u2014 lepiej tego nie robi\u0107. Dzi\u015b opowiem o drugim aspekcie masowej aktualizacji \u2014 <b>o dzia\u0142aniu wyzwalaczy<\/b>.<\/p>\n<p>Na przyk\u0142ad, na tabeli, w kt\u00f3rej musisz co\u015b poprawi\u0107, wisi z\u0142o\u015bliwy wyzwalacz <code>ON UPDATE<\/code>, przenosz\u0105cy wszystkie zmiany do jakich\u015b agregat\u00f3w. A Ty musisz wszystko zaktualizowa\u0107 (na przyk\u0142ad zainicjowa\u0107 nowe pole) tak ostro\u017cnie, aby te agregaty nie zosta\u0142y naruszone.<\/p>\n<h2>Po prostu wy\u0142\u0105czmy wyzwalacze!<\/h2>\n<p><\/p>\n<pre><code class=\"sql\">BEGIN;\n  ALTER TABLE ... DISABLE TRIGGER ...;\n  UPDATE ...; -- trwa to d\u0142ugo\n  ALTER TABLE ... ENABLE TRIGGER ...;\nCOMMIT;<\/code><\/pre>\n<p>\nW\u0142a\u015bciwie, to wszystko \u2014 <b>wszystko ju\u017c wisi<\/b>.<\/p>\n<p>Poniewa\u017c <code>ALTER TABLE<\/code> nak\u0142ada <b>AccessExclusive<\/b>-blokada, pod kt\u00f3r\u0105 nikt r\u00f3wnolegle dzia\u0142aj\u0105cy, nawet zwyk\u0142y <code>SELECT<\/code>, nie b\u0119dzie w stanie niczego przeczyta\u0107 z tabeli. To znaczy, \u017ce dop\u00f3ki ta transakcja nie zako\u0144czy si\u0119, wszyscy ch\u0119tni nawet \"po prostu przeczyta\u0107\" b\u0119d\u0105 musieli czeka\u0107. A my pami\u0119tamy, \u017ce <code>UPDATE<\/code> mamy do-oo-olga\u2026<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h4>To mo\u017ce szybko wy\u0142\u0105czmy, potem szybko w\u0142\u0105czmy!<\/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>\nSytuacja jest ju\u017c lepsza, czas oczekiwania znacznie kr\u00f3tszy. Ale dwie problemy psuj\u0105 ca\u0142\u0105 sytuacj\u0119:<\/p>\n<ul>\n<li><code>ALTER TABLE<\/code> sam czeka na wszystkie inne operacje na tabeli, w tym d\u0142ugie <code>SELECT<\/code><\/li>\n<li>Gdy wyzwalacz jest wy\u0142\u0105czony, <b>\"przeoczy\" ka\u017cd\u0105 zmian\u0119<\/b> w tabeli, nawet nie nasz\u0105. I do agregat\u00f3w nie trafi, chocia\u017c powinno. Problem!<\/li>\n<\/ul>\n<p><\/p>\n<h2>Zarz\u0105dzanie zmiennymi sesji<\/h2>\n<p>\nW poprzedniej wersji natkn\u0119li\u015bmy si\u0119 na kluczowy moment \u2014 trzeba jako\u015b nauczy\u0107 wyzwalacz odr\u00f3\u017cnia\u0107 \u201enasze\u201d zmiany w tabeli od \u201enie naszych\u201d. \u201eNasze\u201d przepuszcza\u0107 jak jest, a na \u201enie nasze\u201d \u2014 dzia\u0142a\u0107. W tym celu mo\u017cna wykorzysta\u0107 <noindex><a rel=\"nofollow\" href=\"https:\/\/postgrespro.ru\/docs\/postgresql\/12\/runtime-config-client\">zmienne sesji<\/a><\/noindex>.<\/p>\n<h4>session_replication_role<\/h4>\n<p>\nCzytamy <noindex><a rel=\"nofollow\" href=\"https:\/\/postgrespro.ru\/docs\/postgresql\/12\/sql-altertable\">podr\u0119cznik<\/a><\/noindex>:<\/p>\n<blockquote><p>Mechanizm uruchamiania wyzwalaczy wp\u0142ywa r\u00f3wnie\u017c na zmienn\u0105 konfiguracyjn\u0105 <noindex><a rel=\"nofollow\" href=\"https:\/\/postgrespro.ru\/docs\/postgresql\/12\/runtime-config-client#GUC-SESSION-REPLICATION-ROLE\">session_replication_role<\/a><\/noindex>. W\u0142\u0105czone bez dodatkowych wskaz\u00f3wek (domy\u015blnie) wyzwalacze b\u0119d\u0105 dzia\u0142a\u0107, gdy rola replikacji \u2014 \u201eorigin\u201d (domy\u015blnie) lub \u201elocal\u201d. Wyzwalacze, w\u0142\u0105czone z wskazaniem <code>ENABLE REPLICA<\/code>, b\u0119d\u0105 dzia\u0142a\u0107 tylko je\u015bli <b>aktualny tryb sesji<\/b> to \u201ereplica\u201d, a wyzwalacze, w\u0142\u0105czone z wskazaniem <code>ENABLE ALWAYS<\/code>, b\u0119d\u0105 dzia\u0142a\u0107 niezale\u017cnie od aktualnego trybu replikacji.<\/p><\/blockquote>\n<p>Szczeg\u00f3lnie podkre\u015blam, \u017ce ustawienia dotycz\u0105 nie wszystkich naraz, jak <code>ALTER TABLE<\/code>, a tylko do naszego oddzielnego specjalnego po\u0142\u0105czenia. Podsumowuj\u0105c, aby \u017cadne wyzwalacze aplikacyjne si\u0119 nie aktywowa\u0142y:<\/p>\n<pre><code class=\"sql\">SET session_replication_role = replica; -- wy\u0142\u0105czyli\u015bmy wyzwalacze\nUPDATE ...;\nSET session_replication_role = DEFAULT; -- przywr\u00f3cono do pierwotnego stanu<\/code><\/pre>\n<p><\/p>\n<h4>Warunek wewn\u0105trz wyzwalacza<\/h4>\n<p>\nJednak powy\u017csza opcja dzia\u0142a dla wszystkich wyzwalaczy jednocze\u015bnie (lub musimy wcze\u015bniej \u201ezmieni\u0107\u201d wyzwalacze, kt\u00f3re chcemy pozostawi\u0107 w\u0142\u0105czone). A je\u015bli musimy <b>\u201ewy\u0142\u0105czy\u0107\u201d jeden konkretny wyzwalacz<\/b>?<\/p>\n<p>W tym pomo\u017ce nam <noindex><a rel=\"nofollow\" href=\"https:\/\/postgrespro.ru\/docs\/postgresql\/12\/runtime-config-custom\">\u201eu\u017cytkownikowa\u201d zmienna sesji<\/a><\/noindex>:<\/p>\n<blockquote><p>Nazwy parametr\u00f3w rozszerze\u0144 s\u0105 zapisywane w nast\u0119puj\u0105cy spos\u00f3b: nazwa rozszerzenia, kropka, a nast\u0119pnie w\u0142a\u015bciwa nazwa parametru, podobnie jak pe\u0142ne nazwy obiekt\u00f3w w SQL. Na przyk\u0142ad: plpgsql.variable_conflict.<br \/>\nPoniewa\u017c parametry systemowe mog\u0105 by\u0107 ustawiane w procesach, kt\u00f3re nie \u0142aduj\u0105 odpowiedniego modu\u0142u rozszerzenia, PostgreSQL akceptuje <b>warto\u015bci dla dowolnych nazw z dwoma komponentami<\/b>.<\/p><\/blockquote>\n<p>Najpierw rozwijamy wyzwalacz, mniej wi\u0119cej tak:<\/p>\n<pre><code class=\"sql\">BEGIN\n    -- w procesie konwersji mo\u017cna robi\u0107 wszystko\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>\nSwoj\u0105 drog\u0105, mo\u017cna to zrobi\u0107 \u201ena \u017cywo\u201d, bez blokad, przez <code>CREATE OR REPLACE<\/code> dla funkcji wyzwalacza. A potem w specjalnym po\u0142\u0105czeniu uruchamiamy \u201eswoj\u0105\u201d zmienn\u0105:<\/p>\n<pre><code class=\"sql\">\nSET mycfg.my_table_convert_process = 'TRUE';\nUPDATE ...;\nSET mycfg.my_table_convert_process = ''; -- przywr\u00f3cono do pierwotnego stanu\n<\/code><\/pre>\n<p>\nZnasz inne sposoby? Podziel si\u0119 nimi w komentarzach.<br \/>\n<br \/>\u0179r\u00f3d\u0142o: <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 5.0.1.1 - 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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