{"id":531,"date":"2020-07-16T17:53:28","date_gmt":"2020-07-16T09:53:28","guid":{"rendered":"http:\/\/www.gbase8.cn\/?p=531"},"modified":"2022-05-26T09:28:30","modified_gmt":"2022-05-26T01:28:30","slug":"gbase-8a%e9%9b%86%e7%be%a4%e6%94%af%e6%8c%81%e7%9a%84%e7%b4%a2%e5%bc%95%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.gbase8.cn\/en\/531","title":{"rendered":"\u5357\u5927\u901a\u7528GBase 8a\u96c6\u7fa4global hash\u548cgrouped\u4eba\u5de5\u7ef4\u62a4\u7684\u7d22\u5f15\u4f7f\u7528"},"content":{"rendered":"<p>GBase 8a\u6570\u636e\u5e93\u652f\u63012\u7c7b\u7d22\u5f15\uff0c\u53ef\u4eba\u5de5\u521b\u5efa\u548c\u5220\u9664\u3002\u5176\u4e2d\u9488\u5bf9\u7cbe\u786e\u67e5\u8be2\u7684Hash\u7d22\u5f15\uff0c\u4ee5\u53ca\u9488\u5bf9\u591a\u5217\u67e5\u8be2\u7684\u884c\u5b58\u5217\u7d22\u5f15\u3002<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Directory Navigation<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6a2af4c57efd7\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6a2af4c57efd7\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.gbase8.cn\/en\/531\/#1%E3%80%81%E9%92%88%E5%AF%B9%E7%B2%BE%E7%A1%AE%E6%9F%A5%E8%AF%A2%E7%9A%84hash_%E7%B4%A2%E5%BC%95\" >1\u3001\u9488\u5bf9\u7cbe\u786e\u67e5\u8be2\u7684hash \u7d22\u5f15<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.gbase8.cn\/en\/531\/#key_block_size\" >key_block_size<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.gbase8.cn\/en\/531\/#key_dc_size\" >key_dc_size<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.gbase8.cn\/en\/531\/#%E8%AF%B4%E6%98%8E\" >\u8bf4\u660e<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.gbase8.cn\/en\/531\/#%E4%BC%98%E7%82%B9\" >\u4f18\u70b9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.gbase8.cn\/en\/531\/#%E7%BC%BA%E7%82%B9\" >\u7f3a\u70b9<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.gbase8.cn\/en\/531\/#2%E3%80%81%E8%A1%8C%E5%AD%98%E5%88%97%E7%B4%A2%E5%BC%95\" >2\u3001\u884c\u5b58\u5217\u7d22\u5f15<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.gbase8.cn\/en\/531\/#%E4%BC%98%E7%82%B9-2\" >\u4f18\u70b9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.gbase8.cn\/en\/531\/#%E7%BC%BA%E7%82%B9-2\" >\u7f3a\u70b9<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1%E3%80%81%E9%92%88%E5%AF%B9%E7%B2%BE%E7%A1%AE%E6%9F%A5%E8%AF%A2%E7%9A%84hash_%E7%B4%A2%E5%BC%95\"><\/span>1\u3001\u9488\u5bf9\u7cbe\u786e\u67e5\u8be2\u7684hash \u7d22\u5f15<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>create index index_name on table_name(field_name) key_block_size=4096 key_dc_size=100 using hash global;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"key_block_size\"><\/span>key_block_size <span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u6307\u5b9a\u6bcf\u4e2a\u6570\u636e\u5757\u7684\u5927\u5c0f\u3002Size_value \u6700\u5c0f\u503c 4096\uff0c\u6700\u5927\u503c32768\uff0csize_value \u5fc5\u987b\u662f 4096 \u7684\u6574\u6570\u500d\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"key_dc_size\"><\/span>key_dc_size<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u591a\u5c11\u4e2a\u6570\u636e\u5305\uff08DataCell\uff09\u521b\u5efa\u4e00\u4e2a hash \u7d22\u5f15\u3002\u6307\u5b9a\u8be5\u53c2\u6570\u65f6\uff0c\u8868\u793a\u521b\u5efa\u7684\u662f\u5206\u6bb5\u54c8\u5e0c\u7d22\u5f15\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E8%AF%B4%E6%98%8E\"><\/span>\u8bf4\u660e<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u7cbe\u786e\u67e5\u8be2(\u7b49\u4e8e= \u548c\u4e0d\u7b49\u4e8e &lt;&gt;)\uff0c\u8303\u56f4\u67e5\u8be2\uff0c\u6a21\u7cca\u67e5\u8be2(like)\u65e0\u6548\u3002<\/p>\n\n\n\n<p>\u9002\u5408\u91cd\u590d\u5ea6\u4f4e\u7684\uff0c\u6bd4\u5982\u8eab\u4efd\u8bc1\u53f7\u7801\uff0c\u624b\u673a\u53f7\uff0cIP\u5730\u5740\u7b49 \u5bf9\u91cd\u590d\u5ea6\u9ad8\u7684\uff0c\u6bd4\u5982\u7701\u4efd\uff0c\u6027\u522b\uff0c\u7c7b\u578b\u7b49\u4e0d\u8981\u5efa\u8fd9\u4e2a\u7d22\u5f15<\/p>\n\n\n\n<p>\u53ef\u4ee5\u901a\u8fc7<\/p>\n\n\n\n<p>drop index index_name on table_name;<\/p>\n\n\n\n<p>\u6765\u5220\u6389\u7d22\u5f15\uff1b<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BC%98%E7%82%B9\"><\/span>\u4f18\u70b9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u63d0\u9ad8\u7cbe\u786e\u67e5\u8be2\u7684\u6027\u80fd\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%BC%BA%E7%82%B9\"><\/span>\u7f3a\u70b9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u589e\u52a0\u4e86\u78c1\u76d8\u5360\u7528\uff0c\u5927\u7ea6\u7b49\u4e8e\u5bf9\u7528\u5217\u6570\u636e\u76841-1.3\u500d\u3002<\/p>\n\n\n\n<p>\u964d\u4f4e\u4e86\u52a0\u8f7d\u6027\u80fd\uff0c\u56e0\u4e3a\u8981\u66f4\u65b0\u7d22\u5f15\u3002\u8fd9\u90e8\u5206\u5f71\u54cd\u548c\u603b\u5217\u6570\uff0c\u6570\u636e\u91cf\uff0c\u6570\u636e\u5bbd\u5ea6\uff0c\u6570\u636e\u7c7b\u578b\uff0c\u670d\u52a1\u5668\u7a7a\u95f2\u5185\u5b58\u6709\u5173\uff0c\u7d22\u5f15\u8d8a\u591a\u5f71\u54cd\u8d8a\u5927\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2%E3%80%81%E8%A1%8C%E5%AD%98%E5%88%97%E7%B4%A2%E5%BC%95\"><\/span>2\u3001\u884c\u5b58\u5217\u7d22\u5f15<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u9488\u5bf9select \u5927\u91cf\u7684\u5217\u7684\u60c5\u51b5\uff0c\u901a\u8fc7\u989d\u5916\u7684\u78c1\u76d8\u6765\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n\n\n\n<p>alter table table_name add grouped group_name (\u67e5\u8be2\u5b57\u6bb51\uff0c\u67e5\u8be2\u5b57\u6bb52,\u3002\u3002\u3002\u3002);<\/p>\n\n\n\n<p>\u53ef\u4ee5\u901a\u8fc7<\/p>\n\n\n\n<p>alter table table_name drop grouped group_name;<\/p>\n\n\n\n<p>\u6765\u5220\u9664<\/p>\n\n\n\n<p>\u5982\u679c\u53easelect \u5f88\u5c11\u7684\u5217\uff0c\u6216\u8005\u5217\u5728\u5d4c\u5957\u5185\u4f7f\u7528\uff0c\u5219\u65e0\u6548\u3002\u6b64\u529f\u80fd\u53ea\u9488\u5bf9\u6700\u5916\u5c42\uff0c\u8fd4\u56de\u7ed3\u679c\u96c6\u524d\u7684\u6700\u540e\u4e00\u6b65\u624d\u6709\u6548\u8fc7\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>\u5982\u4e0a2\u4e2a\u7d22\u5f15\u6700\u5178\u578b\u7684\u573a\u666f<\/p>\n\n\n\n<p>select a,b,c,d,ef,ef,ds,f,dsf,dsf,ds,fds,fdf \u5927\u91cf\u7684\u5217  from myTable where call_number=13812345678<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BC%98%E7%82%B9-2\"><\/span>\u4f18\u70b9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u63d0\u9ad8\u7cbe\u786e\u67e5\u8be2\u7684\u6027\u80fd\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%BC%BA%E7%82%B9-2\"><\/span>\u7f3a\u70b9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u589e\u52a0\u4e86\u78c1\u76d8\u5360\u7528\uff0c\u57fa\u672c\u7b49\u4e8e\u5bf9\u7528\u5217\u6570\u636e\u76841-1.1\u500d\uff0c\u5177\u4f53\u5f97\u770b\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u964d\u4f4e\u4e86\u52a0\u8f7d\u6027\u80fd\uff0c\u53ef\u5bf9\u5e94\u5217\u4e00\u81f4\u3002\u6bd4\u5982\u5168\u90e8\u5217\uff0c\u5219\u589e\u52a0\u4e00\u500d\u3002<\/p>","protected":false},"excerpt":{"rendered":"<p>\u5357\u5927\u901a\u7528GBase 8a\u6570\u636e\u5e93\u652f\u63012\u7c7b\u7d22\u5f15\uff0c\u53ef\u4eba\u5de5\u521b\u5efa\u548c\u5220\u9664\u3002\u5176\u4e2d\u9488\u5bf9\u7cbe\u786e\u67e5\u8be2\u7684Hash\u7d22\u5f15\uff0c\u4ee5\u53ca\u9488\u5bf9\u591a\u5217\u67e5\u8be2\u7684\u884c\u5b58\u5217\u7d22\u5f15\u3002<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-531","post","type-post","status-publish","format-standard","hentry","category-gbase8a"],"_links":{"self":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/531","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/comments?post=531"}],"version-history":[{"count":6,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/531\/revisions"}],"predecessor-version":[{"id":9485,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/531\/revisions\/9485"}],"wp:attachment":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/media?parent=531"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/categories?post=531"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/tags?post=531"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}