{"id":190,"date":"2014-07-01T15:37:08","date_gmt":"2014-07-01T13:37:08","guid":{"rendered":"http:\/\/explainit.pl\/blog\/?p=190"},"modified":"2014-07-01T15:37:08","modified_gmt":"2014-07-01T13:37:08","slug":"kilka-indeksow-na-tej-samej-kolumnie-wyrazeniu","status":"publish","type":"post","link":"https:\/\/explainit.pl\/wordpress\/2014\/07\/01\/kilka-indeksow-na-tej-samej-kolumnie-wyrazeniu\/","title":{"rendered":"Kilka indeks\u00f3w na tej samej kolumnie (wyra\u017ceniu) ?!"},"content":{"rendered":"<p>W przesz\u0142o\u015bci wielokrotnie podejmowa\u0142em dyskusje dotycz\u0105ce w\u0142a\u015bciwego doboru typu indeksu w zale\u017cno\u015bci od charakterystyki danych i od rodzaju wykonywanych zapyta\u0144. Wydawa\u0142o si\u0119, \u017ce jednym z niespe\u0142nionych marze\u0144 programist\u00f3w by\u0142o utworzenie wielu alternatywnych indeks\u00f3w na tej samej kolumnie (np. bitmapowy, b-drzewo, partycjonowany lokalnie, partycjonowany globalnie,&#8230;) tak, aby to optymalizator zapyta\u0144 (a nie programista) wybra\u0142 sobie ten, kt\u00f3ry jest najkorzystniejszy. Dot\u0105d jednak by\u0142o to niemo\u017cliwe.<\/p>\n<p>W wersji Oracle Database 12c nie\u015bmia\u0142o wprowadzono mo\u017cliwo\u015b\u0107 definiowania kilku indeks\u00f3w na tej samej kolumnie (lub wyra\u017ceniu). I chocia\u017c nie uwa\u017cam, aby dobr\u0105 praktyk\u0105 by\u0142o tworzenie wszystkich mo\u017cliwych typ\u00f3w indeks\u00f3w na ka\u017cdej kolumnie, to jednak niew\u0105tpliwie taki mechanizm mo\u017ce nam si\u0119 przyda\u0107 podczas wst\u0119pnych test\u00f3w i eksperyment\u00f3w.<\/p>\n<p>Oracle Database 12c umo\u017cliwia utworzenie kilku indeks\u00f3w na tej samej kolumnie, ale tylko jeden z nich mo\u017ce by\u0107 VISIBLE, pozosta\u0142e musz\u0105 by\u0107 INVISIBLE. W normalnych warunkach pracy optymalizator zapyta\u0144 korzysta tylko z indeksu o statusie VISIBLE. Mo\u017cemy jednak zmieni\u0107 tryb pracy optymalizatora i za pomoc\u0105 parametru <code>optimizer_use_invisible_indexes=true<\/code> sprawi\u0107, aby optymalizator m\u00f3g\u0142 rozwa\u017ca\u0107 tak\u017ce u\u017cycie ka\u017cdego z indeks\u00f3w INVISIBLE.<\/p>\n<p>Oto przyk\u0142ad prostej zabawy w \u201ekt\u00f3ry lepszy?\u201d:<br \/>\n<code><\/code><\/p>\n<p><code>SQL&gt; create table test_ind as select * from dba_objects;<br \/>\nSQL&gt; create bitmap index ind1 on test_ind(owner) invisible;<br \/>\nSQL&gt; create index ind2 on test_ind(owner) invisible;<br \/>\n<\/code><\/p>\n<p><code>SQL&gt; alter session set optimizer_use_invisible_indexes=true;<br \/>\n<\/code><\/p>\n<p><code>SQL&gt; set autotrace on<br \/>\nSQL&gt; select count(*) from test_ind where owner='SCOTT';<br \/>\n...<br \/>\nExecution Plan<br \/>\n------------------------------------------------------------------------<br \/>\n| Id | Operation\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | Name | Rows| Bytes | Cost (%CPU)|Time|<br \/>\n------------------------------------------------------------------------<br \/>\n| 0 \u00a0| SELECT STATEMENT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 | 1\u00a0\u00a0 | 66\u00a0\u00a0\u00a0 | 1 (0)| 00:00:01 |<br \/>\n| 1\u00a0 | SORT AGGREGATE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0 \u00a0| 1\u00a0 \u00a0| 66\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0 \u00a0|\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0|<br \/>\n| 2\u00a0 | BITMAP CONVERSION COUNT\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0| 145 | 9570\u00a0 | 1 (0)| 00:00:01 |<br \/>\n|* 3 | BITMAP INDEX SINGLE VALUE| IND1 |\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |<br \/>\n------------------------------------------------------------------------<br \/>\n<\/code><\/p>\n<p><code>SQL&gt; select max(owner) from test_ind<br \/>\n...<br \/>\nExecution Plan<br \/>\n-------------------------------------------------------------------------<br \/>\n| Id | Operation\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | Name | Rows | Bytes | Cost (%CPU)|Time|<br \/>\n-------------------------------------------------------------------------<br \/>\n| 0\u00a0 | SELECT STATEMENT\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 | 1\u00a0\u00a0\u00a0 | 66\u00a0\u00a0\u00a0 | 2 (0)| 00:00:01 |<br \/>\n| 1\u00a0 | SORT AGGREGATE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0|\u00a0\u00a0\u00a0\u00a0\u00a0 | 1\u00a0\u00a0\u00a0 | 66\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |<br \/>\n| 2\u00a0 | INDEX FULL SCAN (MIN\/MAX)| IND2 | 1\u00a0\u00a0\u00a0 | 66\u00a0\u00a0\u00a0 | 2 (0)| 00:00:01 |<br \/>\n-------------------------------------------------------------------------<\/code><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>W przesz\u0142o\u015bci wielokrotnie podejmowa\u0142em dyskusje dotycz\u0105ce w\u0142a\u015bciwego doboru typu indeksu w zale\u017cno\u015bci od charakterystyki danych i od rodzaju wykonywanych zapyta\u0144. Wydawa\u0142o si\u0119, \u017ce jednym z niespe\u0142nionych marze\u0144 programist\u00f3w by\u0142o utworzenie wielu alternatywnych indeks\u00f3w na tej samej kolumnie (np. bitmapowy, b-drzewo, partycjonowany lokalnie, partycjonowany globalnie,&#8230;) tak, aby to optymalizator zapyta\u0144 (a nie programista) wybra\u0142 sobie ten, <a href=\"https:\/\/explainit.pl\/wordpress\/2014\/07\/01\/kilka-indeksow-na-tej-samej-kolumnie-wyrazeniu\/\" rel=\"nofollow\"><span class=\"sr-only\">Read more about Kilka indeks\u00f3w na tej samej kolumnie (wyra\u017ceniu) ?!<\/span>[&hellip;]<\/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":[10,14,21],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.2.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Kilka indeks\u00f3w na tej samej kolumnie (wyra\u017ceniu) ?! - Explain IT<\/title>\n<meta name=\"description\" content=\"Kilka indeks\u00f3w na tej samej kolumnie (wyra\u017ceniu) ?!\" \/>\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\/07\/01\/kilka-indeksow-na-tej-samej-kolumnie-wyrazeniu\/\" \/>\n<meta property=\"og:locale\" content=\"pl_PL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Kilka indeks\u00f3w na tej samej kolumnie (wyra\u017ceniu) ?! 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