{"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\/cs\/blog\/administrirovanie\/postgresql-antipatterns-menyaem-dannye-v-obhod-triggera","title":{"rendered":"PostgreSQL antipatterny: m\u011bn\u00edme data obch\u00e1z\u00edme spou\u0161t\u011b\u010de","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>D\u0159\u00edve \u010di pozd\u011bji se mnoho lid\u00ed setk\u00e1v\u00e1 s pot\u0159ebou hromadn\u011b n\u011bco opravit v z\u00e1znamech tabulky. U\u017e jsem <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/post\/481610\/\">vypr\u00e1v\u011bl, jak to d\u011blat l\u00e9pe<\/a><\/noindex>, a jak \u2014 l\u00e9pe ned\u011blat. Dnes v\u00e1m pov\u00edm o druh\u00e9m aspektu hromadn\u00e9 aktualizace \u2014 <b>o zpracov\u00e1n\u00ed trigger\u016f<\/b>.<\/p>\n<p>Nap\u0159\u00edklad na tabulce, ve kter\u00e9 pot\u0159ebujete n\u011bco opravit, je zl\u00fd trigger <code>ON UPDATE<\/code>, kter\u00fd p\u0159en\u00e1\u0161\u00ed ve\u0161ker\u00e9 zm\u011bny do n\u011bjak\u00fdch agreg\u00e1t\u016f. A vy pot\u0159ebujete v\u0161echny aktualizovat (nap\u0159\u00edklad inicializovat nov\u00e9 pole) tak opatrn\u011b, aby se tyto agreg\u00e1ty nedotkly.<\/p>\n<h2>Prost\u011b deaktivujme triggery!<\/h2>\n<p><\/p>\n<pre><code class=\"sql\">BEGIN;\n  ALTER TABLE ... DISABLE TRIGGER ...;\n  UPDATE ...; -- to bude dlouh\u00e9\n  ALTER TABLE ... ENABLE TRIGGER ...;\nCOMMIT;<\/code><\/pre>\n<p>\nVlastn\u011b, to je v\u0161e \u2014 <b>v\u0161e u\u017e vis\u00ed<\/b>.<\/p>\n<p>Proto\u017ee <code>ALTER TABLE<\/code> aplikuje <b>AccessExclusive<\/b>-uzam\u010den\u00ed, pod kter\u00fdm nikdo, kdo prov\u00e1d\u00ed paraleln\u00ed operace, dokonce ani jednoduch\u00e9 <code>nebude prov\u00e1d\u011bn p\u0159i nepravdivosti prvn\u00ed podm\u00ednky. Opravy pomoc\u00ed<\/code>, nebude moci nic z tabulky p\u0159e\u010d\u00edst. To znamen\u00e1, \u017ee dokud tato transakce neskon\u010d\u00ed, v\u0161ichni, kdo cht\u011bj\u00ed \u201eprost\u011b \u010d\u00edst\u201c, budou \u010dekat. A pamatujeme, \u017ee <code>AKTUALIZACE<\/code> m\u00e1me d-\u016f-\u016f-lh\u00fd\u2026<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h4>Tak rychle deaktivujme, pak rychle znovu aktivujeme!<\/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>\nSituace je u\u017e lep\u0161\u00ed, \u010das \u010dek\u00e1n\u00ed je podstatn\u011b krat\u0161\u00ed. Ale dv\u011b probl\u00e9my kaz\u00ed celou n\u00e1dheru:<\/p>\n<ul>\n<li><code>ALTER TABLE<\/code> on \u010dek\u00e1 na v\u0161echny ostatn\u00ed operace na tabulce, v\u010detn\u011b dlouh\u00fdch <code>nebude prov\u00e1d\u011bn p\u0159i nepravdivosti prvn\u00ed podm\u00ednky. Opravy pomoc\u00ed<\/code><\/li>\n<li>Dokud je trigger vypnut\u00fd, <b>jak\u00e1koli zm\u011bna<\/b> v tabulce, dokonce ani na\u0161e, \u201eprolet\u00ed kolem\u201c. A do agreg\u00e1t\u016f se nedostane, i kdy\u017e by m\u011bla. To je probl\u00e9m!<\/li>\n<\/ul>\n<p><\/p>\n<h2>Spr\u00e1va sezen\u00ed s prom\u011bnn\u00fdmi<\/h2>\n<p>\nTak\u017ee v p\u0159edchoz\u00edm variant\u011b jsme narazili na z\u00e1sadn\u00ed bod \u2014 mus\u00edme n\u011bjak nau\u010dit trigger odli\u0161ovat \u201ena\u0161e\u201c zm\u011bny v tabulce od \u201ene na\u0161ich\u201c. \u201eNa\u0161e\u201c nechat tak, jak jsou, a \u201ene na\u0161e\u201c \u2014 spou\u0161t\u011bt. K tomu lze pou\u017e\u00edt <noindex><a rel=\"nofollow\" href=\"https:\/\/postgrespro.ru\/docs\/postgresql\/12\/runtime-config-client\">prom\u011bnn\u00e9 sezen\u00ed<\/a><\/noindex>.<\/p>\n<h4>session_replication_role<\/h4>\n<p>\nP\u0159e\u010dt\u011bte si <noindex><a rel=\"nofollow\" href=\"https:\/\/postgrespro.ru\/docs\/postgresql\/12\/sql-altertable\">n\u00e1vod<\/a><\/noindex>:<\/p>\n<blockquote><p>Na mechanismus spou\u0161t\u011bn\u00ed trigger\u016f tak\u00e9 vpl\u00fdv\u00e1 konfigura\u010dn\u00ed prom\u011bnn\u00e1 <noindex><a rel=\"nofollow\" href=\"https:\/\/postgrespro.ru\/docs\/postgresql\/12\/runtime-config-client#GUC-SESSION-REPLICATION-ROLE\">session_replication_role<\/a><\/noindex>. Spu\u0161t\u011bn\u00e9 bez dal\u0161\u00edch pokyn\u016f (ve v\u00fdchoz\u00edm nastaven\u00ed) triggery se spust\u00ed, kdy\u017e je replika\u010dn\u00ed role \u2014 \u201eorigin\u201c (ve v\u00fdchoz\u00edm nastaven\u00ed) nebo \u201elocal\u201c. Triggery spu\u0161t\u011bn\u00e9 ur\u010den\u00edm <code>ENABLE REPLICA<\/code>, se spust\u00ed pouze pokud <b>aktu\u00e1ln\u00ed re\u017eim sezen\u00ed<\/b> \u2014 \u201ereplica\u201c, a triggery spu\u0161t\u011bn\u00e9 ur\u010den\u00edm <code>ENABLE ALWAYS<\/code>, se spust\u00ed bez ohledu na aktu\u00e1ln\u00ed replika\u010dn\u00ed re\u017eim.<\/p><\/blockquote>\n<p>Zvl\u00e1\u0161\u0165 zd\u016frazn\u00edm, \u017ee nastaven\u00ed se net\u00fdk\u00e1 v\u0161ech najednou, jako <code>ALTER TABLE<\/code>, a pouze k na\u0161emu speci\u00e1ln\u00edmu p\u0159ipojen\u00ed. Celkem, aby se \u017e\u00e1dn\u00e9 aplika\u010dn\u00ed spou\u0161t\u011b\u010de neaktivovaly:<\/p>\n<pre><code class=\"sql\">SET session_replication_role = replica; -- vypnuly se spou\u0161t\u011b\u010de\nUPDATE ...;\nSET session_replication_role = DEFAULT; -- vr\u00e1tili do p\u016fvodn\u00edho stavu<\/code><\/pre>\n<p><\/p>\n<h4>Podm\u00ednka uvnit\u0159 spou\u0161t\u011b\u010de<\/h4>\n<p>\nAle v\u00fd\u0161e uveden\u00e1 varianta funguje pro v\u0161echny spou\u0161t\u011b\u010de najednou (nebo je t\u0159eba \"alterovat\" p\u0159edem spou\u0161t\u011b\u010de, kter\u00e9 nechceme vypnout). A pokud pot\u0159ebujeme <b>\"vypnout\" jeden konkr\u00e9tn\u00ed spou\u0161t\u011b\u010d<\/b>?<\/p>\n<p>S t\u00edm n\u00e1m pom\u016f\u017ee <noindex><a rel=\"nofollow\" href=\"https:\/\/postgrespro.ru\/docs\/postgresql\/12\/runtime-config-custom\">\"u\u017eivatelsk\u00e1\" prom\u011bnn\u00e1 relace<\/a><\/noindex>:<\/p>\n<blockquote><p>N\u00e1zvy parametr\u016f roz\u0161\u00ed\u0159en\u00ed se zapisuj\u00ed n\u00e1sleduj\u00edc\u00edm zp\u016fsobem: n\u00e1zev roz\u0161\u00ed\u0159en\u00ed, te\u010dka a pot\u00e9 vlastn\u00ed n\u00e1zev parametru, podobn\u011b jako pln\u00e1 jm\u00e9na objekt\u016f v SQL. Nap\u0159\u00edklad: plpgsql.variable_conflict.<br \/>\nJeliko\u017e syst\u00e9mov\u00e9 parametry mohou b\u00fdt nastaveny v procesech, kter\u00e9 nena\u010d\u00edtaj\u00ed odpov\u00eddaj\u00edc\u00ed modul roz\u0161\u00ed\u0159en\u00ed, PostgreSQL p\u0159ij\u00edm\u00e1 <b>hodnoty pro jak\u00e1koliv jm\u00e9na se dv\u011bma komponenty<\/b>.<\/p><\/blockquote>\n<p>Nejprve uprav\u00edme spou\u0161t\u011b\u010d, p\u0159ibli\u017en\u011b takto:<\/p>\n<pre><code class=\"sql\">BEGIN\n    -- procesu konverze lze d\u011blat v\u0161echno\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>\nMimochodem, to lze ud\u011blat \"na\u017eivo\", bez z\u00e1mk\u016f, prost\u0159ednictv\u00edm <code>CREATE OR REPLACE<\/code> pro spou\u0161t\u011bc\u00ed funkci. A pot\u00e9 v speci\u00e1ln\u00edm p\u0159ipojen\u00ed nastavujeme \"na\u0161i\" prom\u011bnnou:<\/p>\n<pre><code class=\"sql\">\nSET mycfg.my_table_convert_process = 'TRUE';\nUPDATE ...;\nSET mycfg.my_table_convert_process = ''; -- vr\u00e1tili do p\u016fvodn\u00edho stavu\n<\/code><\/pre>\n<p>\nZn\u00e1te jin\u00e9 zp\u016fsoby? Pod\u011blte se v koment\u00e1\u0159\u00edch.<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 5.0.3 - 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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