{"id":180,"date":"2014-02-05T13:33:28","date_gmt":"2014-02-05T12:33:28","guid":{"rendered":"http:\/\/explainit.pl\/blog\/?p=180"},"modified":"2016-08-09T20:59:25","modified_gmt":"2016-08-09T18:59:25","slug":"automatic-data-optimization-w-12c-information-lifecycle-management","status":"publish","type":"post","link":"https:\/\/explainit.pl\/wordpress\/2014\/02\/05\/automatic-data-optimization-w-12c-information-lifecycle-management\/","title":{"rendered":"Automatic Data Optimization w 12c (Information Lifecycle Management)"},"content":{"rendered":"

To jedna z ciekawszych nowych funkcjonalno\u015bci serwera Oracle Database 12c. Pomaga zoptymalizowa\u0107 mechanizmy sk\u0142adowania danych, kt\u00f3rymi u\u017cytkownicy od pewnego czasu przestali si\u0119 aktywnie interesowa\u0107. Aktualnie dost\u0119pne s\u0105 dwa rozwi\u0105zania: (1) kompresja (rekompresja) danych \u201eniedotykanych\u201d przez u\u017cytkownik\u00f3w, (2) przenoszenie (tzw. tiering) do \u201eta\u0144szej\u201d przestrzeni tabel tych partycji, kt\u00f3re przestaj\u0105 si\u0119 mie\u015bci\u0107 w aktualnej przestrzeni tabel, a kt\u00f3rymi u\u017cytkownicy najmniej si\u0119 interesuj\u0105.<\/p>\n

Aby skorzysta\u0107 z Automatic Data Optimization nale\u017cy zdefiniowa\u0107 tzw. polityk\u0119 ILM, np.:<\/p>\n

alter table zamowienia ilm add policy
\ncolumn store compress for query high
\nsegment after 30 days of no modification<\/code><\/p>\n

gdzie \u201ecolumn store compress for query high\u201d wskazuje algorytm kompresji, \u201esegment\u201d wskazuje poziom kompresji, a \u201eafter 30 days of no modification\u201d wskazuje warunek inicjuj\u0105cy kompresj\u0119. W tym przypadku po 30 dniach niemodyfikowania rekord\u00f3w tabeli \u201ezamowienia\u201d przez u\u017cytkownik\u00f3w, zawarto\u015b\u0107 tej tabeli zostanie automatycznie skompresowana metod\u0105 HCC (znan\u0105 z Exadaty). Kompresja nast\u0105pi w czasie nocnego okna serwisowego, a o jej pomy\u015blnym przebiegu przekonamy si\u0119 nast\u0119pnego dnia zagl\u0105daj\u0105c np. do DBA_TABLES.<\/p>\n

Przyk\u0142ad innej polityki ILM, powoduj\u0105cej przeniesienie partycji do \u201eta\u0144szej\u201d przestrzeni tabel:<\/p>\n

alter table zamowienia
\nmodify partition p34
\nilm add policy tier to low_cost_tbsp<\/code><\/p>\n

przeniesienie partycji nast\u0105pi automatycznie w chwili, gdy wolne miejsce w przestrzeni tabel, w kt\u00f3rej aktualnie sie ona znajduje, spadnie poni\u017cej TBS_PERCENT_FREE (25%, ustawiane za pomoc\u0105 dbms_ilm_admin.customize_ilm(), obserwowane w dba_ilmparameters).<\/p>\n

Nale\u017cy doda\u0107, \u017ce warunkiem poprawnego funkcjonowania polityk ILM jest w\u0142\u0105czona funkcja Heat Map (alter system set heat_map=on), a ta w 12.1 nie dzia\u0142a w konfiguracji \u201ekontenerowej\u201d (no comments…).<\/p>\n","protected":false},"excerpt":{"rendered":"

To jedna z ciekawszych nowych funkcjonalno\u015bci serwera Oracle Database 12c. Pomaga zoptymalizowa\u0107 mechanizmy sk\u0142adowania danych, kt\u00f3rymi u\u017cytkownicy od pewnego czasu przestali si\u0119 aktywnie interesowa\u0107. Aktualnie dost\u0119pne s\u0105 dwa rozwi\u0105zania: (1) kompresja (rekompresja) danych \u201eniedotykanych\u201d przez u\u017cytkownik\u00f3w, (2) przenoszenie (tzw. tiering) do \u201eta\u0144szej\u201d przestrzeni tabel tych partycji, kt\u00f3re przestaj\u0105 si\u0119 mie\u015bci\u0107 w aktualnej przestrzeni tabel, a Read more about Automatic Data Optimization w 12c (Information Lifecycle Management)<\/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":[14],"yoast_head":"\nAutomatic Data Optimization w 12c (Information Lifecycle Management) - Explain IT<\/title>\n<meta name=\"description\" content=\"Automatic Data Optimization w 12c (Information Lifecycle Management)\" \/>\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\/2014\/02\/05\/automatic-data-optimization-w-12c-information-lifecycle-management\/\" \/>\n<meta property=\"og:locale\" content=\"pl_PL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Automatic Data Optimization w 12c (Information Lifecycle Management) - 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