{"id":544,"date":"2017-09-13T11:19:53","date_gmt":"2017-09-13T09:19:53","guid":{"rendered":"http:\/\/explainit.pl\/wordpress\/?p=544"},"modified":"2017-09-13T11:19:53","modified_gmt":"2017-09-13T09:19:53","slug":"automatyczne-zarzadzanie-pamiecia-sga-a-usterka-ora-04031","status":"publish","type":"post","link":"https:\/\/explainit.pl\/wordpress\/2017\/09\/13\/automatyczne-zarzadzanie-pamiecia-sga-a-usterka-ora-04031\/","title":{"rendered":"Automatyczne zarz\u0105dzanie pami\u0119ci\u0105 SGA a usterka ORA-04031"},"content":{"rendered":"

Od czas\u00f3w wersji Oracle Database 10g powszechnie wykorzystujemy mechanizmy automatycznego zarz\u0105dzania pami\u0119ci\u0105 operacyjn\u0105 instancji (Automatic Shared Memory Management – ASMM, czy p\u00f3\u017aniej Automatic Memory Management – AMM). Pami\u0119tamy ze szkole\u0144, \u017ce zwalniaj\u0105 one administratora m.in. z obowi\u0105zku r\u0119cznego konfigurowania rozmiar\u00f3w obszar\u00f3w buforowych takich jak Buffer Cache i Shared Pool oraz z podejmowania decyzji o proporcji rozmiar\u00f3w PGA\/SGA. Wymagaj\u0105 jedynie okre\u015blenia po\u017c\u0105danego rozmiaru ca\u0142kowitego SGA (parametr SGA_TARGET) lub po\u017c\u0105danego sumarycznego rozmiaru PGA i SGA (parametr MEMORY_TARGET). Warto podkre\u015bli\u0107, \u017ce nadal poprawne jest r\u00f3wnoleg\u0142e stosowanie parametr\u00f3w wymiaruj\u0105cych poszczeg\u00f3lne obszary buforowe w SGA – DB_CACHE_SIZE i SHARED_POOL_SIZE – lecz nabieraj\u0105 one w\u00f3wczas innego znaczenia, okre\u015blaj\u0105c mianowicie minimalne (a nie po\u017c\u0105dane) rozmiary alokowanej pami\u0119ci operacyjnej.
\n
\nNie zawsze mechanizmy automatycznego zarz\u0105dzania pami\u0119ci\u0105 operacyjn\u0105 funkcjonuj\u0105 tak, jak by\u015bmy tego oczekiwali. W systemach poddanych bardzo intensywnemu obci\u0105\u017ceniu i jednocze\u015bnie „dusz\u0105cych si\u0119” w niewystarczaj\u0105cej pami\u0119ci SGA stosunkowo powszechnie spotykamy si\u0119 z problemem „migotania” pami\u0119ci – cz\u0119stego przenoszenia pami\u0119ci RAM pomi\u0119dzy Buffer Cache i Shared Pool (diagnostyka: select * from v$sga_resize_ops order by start_time<\/code>). Strony pami\u0119ci b\u0119d\u0105ce w trakcie transferu pomi\u0119dzy tymi buforami s\u0105 w znacznej mierze nieu\u017cyteczne dla serwera (oznaczone jako „KGH: NO ACCESS”), co mo\u017ce prowadzi\u0107 do szybkiego wyczerpania miejsca w Bufer Cache lub w Shared Pool (cz\u0119\u015bciej w Shared Pool). Efektem mo\u017ce by\u0107 raportowanie usterki ORA-04031 (ORA-04031: unable to allocate X bytes of shared memory) i szybka zapa\u015b\u0107 systemu.
\n
\nPodstawowe rozwi\u0105zanie powy\u017cszego problemu polega na cz\u0119\u015bciowym odst\u0105pieniu<\/b> od pe\u0142nej automatyzacji zarz\u0105dzania pami\u0119ci\u0105 operacyjn\u0105 instancji i r\u0119czne okre\u015blenie minimalnych rozmiar\u00f3w obszar\u00f3w buforowych Shared Pool i Buffer Cache. Aby jednak nadal korzysta\u0107 ze sk\u0105din\u0105d bardzo po\u017cytecznych mechanizm\u00f3w automatyzacji, proponuj\u0119 rozdysponowa\u0107 w ten spos\u00f3b jedynie ok. 50% dost\u0119pnej pami\u0119ci SGA. W\u00f3wczas pozosta\u0142\u0105 cz\u0119\u015b\u0107 pami\u0119ci serwer bazy danych b\u0119dzie m\u00f3g\u0142 nadal przydziela\u0107 dynamicznie w oparciu o monitorowane potrzeby, ale jednocze\u015bnie nie doprowadzi do nieakceptowalnie ma\u0142ych rozmiar\u00f3w krytycznych obszar\u00f3w SGA. Przyk\u0142adowo, gdyby SGA_TARGET ustawiony by\u0142 na 40 GB, ustawienia Buffer Cache i Shared Pool mog\u0142yby by\u0107 nast\u0119puj\u0105ce:
\n
\nalter system set db_cache_size=10GB;
\nalter system set shared_pool_size=10GB;<\/code>
\n
\nPowodzenia!<\/p>\n","protected":false},"excerpt":{"rendered":"

Od czas\u00f3w wersji Oracle Database 10g powszechnie wykorzystujemy mechanizmy automatycznego zarz\u0105dzania pami\u0119ci\u0105 operacyjn\u0105 instancji (Automatic Shared Memory Management – ASMM, czy p\u00f3\u017aniej Automatic Memory Management – AMM). Pami\u0119tamy ze szkole\u0144, \u017ce zwalniaj\u0105 one administratora m.in. z obowi\u0105zku r\u0119cznego konfigurowania rozmiar\u00f3w obszar\u00f3w buforowych takich jak Buffer Cache i Shared Pool oraz z podejmowania decyzji o proporcji Read more about Automatyczne zarz\u0105dzanie pami\u0119ci\u0105 SGA a usterka ORA-04031<\/span>[…]<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2],"tags":[5,32],"yoast_head":"\nAutomatyczne zarz\u0105dzanie pami\u0119ci\u0105 SGA a usterka ORA-04031 - Explain IT<\/title>\n<meta name=\"description\" content=\"Automatyczne zarz\u0105dzanie pami\u0119ci\u0105 SGA a usterka ORA-04031\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/explainit.pl\/wordpress\/2017\/09\/13\/automatyczne-zarzadzanie-pamiecia-sga-a-usterka-ora-04031\/\" \/>\n<meta property=\"og:locale\" content=\"pl_PL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Automatyczne zarz\u0105dzanie pami\u0119ci\u0105 SGA a usterka ORA-04031 - 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