{"id":23,"date":"2007-01-03T17:48:49","date_gmt":"2007-01-03T14:48:49","guid":{"rendered":"http:\/\/blog.yavor.info\/?p=23"},"modified":"2007-01-03T17:50:18","modified_gmt":"2007-01-03T14:50:18","slug":"%d0%9e%d0%bf%d1%82%d0%b8%d0%bc%d0%b8%d0%b7%d0%b8%d1%80%d0%b0%d0%bd%d0%b8%d1%82%d0%b5-%d0%be%d0%bf%d1%82%d0%b8%d0%bc%d0%b8%d0%b7%d0%b0%d1%82%d0%be%d1%80%d0%b8","status":"publish","type":"post","link":"http:\/\/blog.yavor.info\/?p=23","title":{"rendered":"\u041e\u043f\u0442\u0438\u043c\u0438\u0437\u0438\u0440\u0430\u043d\u0438\u0442\u0435 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0442\u043e\u0440\u0438"},"content":{"rendered":"

\u0414\u043d\u0435\u0441 \u043e\u0442 \u0447\u0438\u0441\u0442\u043e \u043b\u044e\u0431\u043e\u043f\u0438\u0442\u0441\u0442\u0432\u043e \u0440\u0435\u0448\u0438\u0445 \u0434\u0430 \u043f\u043e\u0433\u043b\u0435\u0434\u043d\u0430 \u043a\u043e\u0438 \u0441\u0430 \u043d\u0430\u0439-\u0442\u0435\u0436\u043a\u0438\u0442\u0435 (\u043e\u0442 \u0433\u043b\u0435\u0434\u043d\u0430 \u0442\u043e\u0447\u043d\u0430 \u043d\u0430 \u0434\u0438\u0441\u043a\u043e\u0432\u0438 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438) \u0437\u0430\u044f\u0432\u043a\u0438 \u0432 \u0435\u0434\u043d\u0430 \u0442\u0435\u0441\u0442\u043e\u0432\u0430 \u0411\u0414 (Oracle 10.2.0.2). \u0418\u0437\u043f\u043e\u043b\u0437\u0432\u0430\u0445 \u0432\u0433\u0440\u0430\u0434\u0435\u043d\u0438\u044f \u0440\u0435\u043f\u043e\u0440\u0442 \u0432 Oracle SQL Developer. \u0422\u0430\u0437\u0438 \u0411\u0414 \u043d\u0435 \u0441\u0435 \u0438\u0437\u043f\u043e\u043b\u0437\u0432\u0430 \u043c\u043d\u043e\u0433\u043e, \u043e\u0441\u043e\u0431\u0435\u043d\u043e \u0434\u043d\u0435\u0441, \u043d\u043e \u0432\u0441\u0435 \u043f\u0430\u043a \u043e\u0441\u0442\u0430\u043d\u0430\u0445 \u0438\u0437\u0443\u043c\u0435\u043d \u043e\u0442 \u0440\u0435\u0437\u0443\u043b\u0442\u0430\u0442\u0430. \u0422\u043e\u0432\u0430 \u0441\u0430 \u0434\u0432\u0435\u0442\u0435 \u043d\u0430\u0439-\u043b\u043e\u0448\u0438:<\/p>\n

select \/*+ rule *\/bucket, endpoint, col#, epvalue
\n from histgrm$
\n where obj# = :1
\n and intcol# = :2
\n and row# = :3
\n order by bucket<\/code><\/p>\n

select \/*+ rule *\/ bucket_cnt, row_cnt, cache_cnt, null_cnt, timestamp#, sample_size,
\n minimum, maximum, distcnt, lowval, hival, density, col#, spare1, spare2, avgcln
\n from hist_head$
\n where obj# = :1
\n and intcol# = :2<\/code><\/p>\n

\u0422\u043e\u0432\u0430, \u0432\u0435\u0440\u043e\u044f\u0442\u043d\u043e, \u0441\u0430 \u0440\u0435\u043a\u0443\u0440\u0441\u0438\u0432\u043d\u0438 \u0437\u0430\u044f\u0432\u043a\u0438 \u0437\u0430 \u043f\u0440\u0435\u0433\u043b\u0435\u0434 \u043d\u0430 \u0445\u0438\u0441\u0442\u043e\u0433\u0440\u0430\u043c\u0438\u0442\u0435. \u0417\u0430\u0431\u0430\u0432\u043d\u043e\u0442\u043e \u0432 \u0441\u043b\u0443\u0447\u0430\u044f \u0435, \u0447\u0435 \u0438\u0437\u043f\u043e\u043b\u0437\u0432\u0430\u0442 \u0445\u0438\u043d\u0442\u0430 \/*+ rule *\/<\/strong>.
\n\u0414\u043e \u0442\u0443\u043a \u0441 \u0434\u0435\u0441\u044a\u043f\u043e\u0440\u0442\u0430 \u043d\u0430 rule-based optimizer \u0432 10g!<\/em> \u0429\u043e\u043c Oracle \u0434\u043e\u0440\u0438 \u0432 \u0441\u043e\u0431\u0441\u0442\u0432\u0435\u043d\u0438\u044f \u0441\u0438 \u043a\u043e\u0434 \u0433\u043e \u0438\u0437\u043f\u043e\u043b\u0437\u0432\u0430\u0442… \u041f\u0440\u0438 \u0442\u043e\u0432\u0430 \u0432 Oracle 10g Release 2<\/strong>
\n\u041d\u043e \u0442\u043e\u0432\u0430 \u043d\u0435 \u0435 \u043d\u043e\u0432\u0438\u043d\u0430. \u041f\u043e-\u0432\u0435\u0441\u0435\u043b\u0430\u0442\u0430 \u0447\u0430\u0441\u0442 \u0435, \u0447\u0435 \u0442\u043e\u0432\u0430 \u0438\u043b\u0438 \u0435 \u0437\u0430\u044f\u0432\u043a\u0430, \u0438\u0437\u0432\u0438\u043a\u0432\u0430\u043d\u0430 \u043e\u0442 \u043a\u043e\u0434\u0430 \u043d\u0430 \u0441\u0430\u043c\u0438\u044f\u0442 cost based optimizer; \u0438\u043b\u0438 \u0435 \u0437\u0430\u044f\u0432\u043a\u0430, \u0438\u0437\u0432\u0438\u043a\u0432\u0430\u043d\u0430 \u043f\u0440\u0438 \u0441\u044a\u0431\u0438\u0440\u0430\u043d\u0435 \u043d\u0430 \u0441\u0442\u0430\u0442\u0438\u0441\u0442\u0438\u043a\u0438\u0442\u0435, \u0442\u043e\u043b\u043a\u043e\u0432\u0430 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u0438 \u0437\u0430 CBO. \u041f\u0440\u0438 \u0432\u0441\u0438\u0447\u043a\u0438 \u0441\u043b\u0443\u0447\u0430\u0438 \u0442\u043e\u0437\u0438 \u043a\u043e\u0434, \u043a\u043e\u043b\u043a\u043e\u0442\u043e \u0438 \u0434\u0430 \u0435 legacy (\u0434\u0430 \u043a\u0430\u0436\u0435\u043c, \u0447\u0435 \u0435 \u043e\u0442 Oracle 8i) \u0435 \u043f\u0438\u0441\u0430\u043d \u0421\u041b\u0415\u0414 \u043f\u043e\u044f\u0432\u0430\u0442\u0430 \u043d\u0430 CBO. \u0412 \u043a\u0440\u0430\u0439\u043d\u0430 \u0441\u043c\u0435\u0442\u043a\u0430 \u0442\u043e\u0447\u043d\u043e CBO \u0438\u0437\u043f\u043e\u043b\u0437\u0432\u0430 \u0445\u0438\u0441\u0442\u043e\u0433\u0440\u0430\u043c\u0438\u0442\u0435 \u2013 RBO \u0442\u0430\u043a\u0430 \u0438 \u043d\u0435 \u0437\u043d\u0430\u0435 \u0437\u0430 \u0442\u044f\u0445!
\n\ud83d\ude42<\/p>\n","protected":false},"excerpt":{"rendered":"

\u0414\u043d\u0435\u0441 \u043e\u0442 \u0447\u0438\u0441\u0442\u043e \u043b\u044e\u0431\u043e\u043f\u0438\u0442\u0441\u0442\u0432\u043e \u0440\u0435\u0448\u0438\u0445 \u0434\u0430 \u043f\u043e\u0433\u043b\u0435\u0434\u043d\u0430 \u043a\u043e\u0438 \u0441\u0430 \u043d\u0430\u0439-\u0442\u0435\u0436\u043a\u0438\u0442\u0435 (\u043e\u0442 \u0433\u043b\u0435\u0434\u043d\u0430 \u0442\u043e\u0447\u043d\u0430 \u043d\u0430 \u0434\u0438\u0441\u043a\u043e\u0432\u0438 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438) \u0437\u0430\u044f\u0432\u043a\u0438 \u0432 \u0435\u0434\u043d\u0430 \u0442\u0435\u0441\u0442\u043e\u0432\u0430 \u0411\u0414 (Oracle 10.2.0.2). \u0418\u0437\u043f\u043e\u043b\u0437\u0432\u0430\u0445 \u0432\u0433\u0440\u0430\u0434\u0435\u043d\u0438\u044f \u0440\u0435\u043f\u043e\u0440\u0442 \u0432 Oracle SQL Developer. \u0422\u0430\u0437\u0438 \u0411\u0414 \u043d\u0435 \u0441\u0435 \u0438\u0437\u043f\u043e\u043b\u0437\u0432\u0430 \u043c\u043d\u043e\u0433\u043e, \u043e\u0441\u043e\u0431\u0435\u043d\u043e \u0434\u043d\u0435\u0441, \u043d\u043e \u0432\u0441\u0435 \u043f\u0430\u043a \u043e\u0441\u0442\u0430\u043d\u0430\u0445 \u0438\u0437\u0443\u043c\u0435\u043d \u043e\u0442 \u0440\u0435\u0437\u0443\u043b\u0442\u0430\u0442\u0430. \u0422\u043e\u0432\u0430 \u0441\u0430 \u0434\u0432\u0435\u0442\u0435 \u043d\u0430\u0439-\u043b\u043e\u0448\u0438: select \/*+ rule *\/bucket, endpoint, col#, […]<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"http:\/\/blog.yavor.info\/index.php?rest_route=\/wp\/v2\/posts\/23"}],"collection":[{"href":"http:\/\/blog.yavor.info\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/blog.yavor.info\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/blog.yavor.info\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/blog.yavor.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=23"}],"version-history":[{"count":0,"href":"http:\/\/blog.yavor.info\/index.php?rest_route=\/wp\/v2\/posts\/23\/revisions"}],"wp:attachment":[{"href":"http:\/\/blog.yavor.info\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=23"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/blog.yavor.info\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=23"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/blog.yavor.info\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=23"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}