{"id":334,"date":"2022-06-23T20:57:27","date_gmt":"2022-06-23T12:57:27","guid":{"rendered":"https:\/\/frogvps.com\/?p=334"},"modified":"2022-06-23T20:57:28","modified_gmt":"2022-06-23T12:57:28","slug":"innodb%e4%b8%ad%e4%b8%80%e9%a2%97b%e6%a0%91%e5%8f%af%e4%bb%a5%e5%ad%98%e6%94%be%e5%a4%9a%e5%b0%91%e8%a1%8c%e6%95%b0%e6%8d%ae","status":"publish","type":"post","link":"https:\/\/frogvps.com\/?p=334","title":{"rendered":"InnoDB\u4e2d\u4e00\u9897B+\u6811\u53ef\u4ee5\u5b58\u653e\u591a\u5c11\u884c\u6570\u636e"},"content":{"rendered":"\n
\"\"
B+Tree\u7d22\u5f15<\/figcaption><\/figure>\n\n\n\n

B+Tree\u7d22\u5f15<\/h2>\n\n\n\n

\u6309\u987a\u5e8f\u5b58\u50a8\uff0c\u6bcf\u4e00\u4e2a\u53f6\u5b50\u8282\u70b9\u5230\u6839\u7ed3\u70b9\u7684\u8ddd\u79bb\u662f\u76f8\u540c\u7684\uff1b\u5de6\u524d\u7f00\u7d22\u5f15\uff0c\u9002\u5408\u67e5\u8be2\u8303\u56f4\u7c7b\u7684\u6570\u636e\u3002<\/p>\n\n\n\n

\n\n\n\n

\u5728InnoDB\u5b58\u50a8\u5f15\u64ce\u4e2d\uff0c\u4e00\u9897\u7684B+\u6811\u53ef\u4ee5\u5b58\u653e\u591a\u5c11\u884c\u6570\u636e\uff1f<\/strong><\/p>\n\n\n\n

\u6211\u4eec\u53ef\u4ee5\u5927\u6982\u7684\u4f30\u7b97\u4e00\u4e0b<\/p>\n\n\n\n

\u5047\u8bbe\u4e00\u9897B+\u6811\u7684\u9ad8\u5ea6\u4e3a2\u5c42\uff0c\u5373\u6709\u4e00\u4e2a\u6839\u8282\u70b9\u548c\u82e5\u5e72\u4e2a\u53f6\u5b50\u8282\u70b9\u3002<\/p>\n\n\n\n

\u90a3\u4e48\u8fd9\u9897\u6811\u7406\u8bba\u4e0a\u53ef\u4ee5\u5b58\u653e\u7684\uff0c\u603b\u884c\u8bb0\u5f55\u6570=\u6839\u8282\u70b9\u6307\u9488\u6570 * \u5355\u4e2a\u53f6\u5b50\u8282\u70b9\u8bb0\u5f55\u7684\u884c\u6570\u3002<\/p>\n\n\n\n

\n\n\n\n

\u6211\u4eec\u5148\u8ba1\u7b97\u53f6\u5b50\u8282\u70b9\uff1a<\/strong><\/p>\n\n\n\n

B+\u6811\u4e2d\u5355\u4e2a\u53f6\u5b50\u8282\u70b9\u5927\u5c0f\u4e3a16K\uff0c\u5047\u8bbe\u6bcf\u4e00\u6761\u8bb0\u5f55\u662f1K\uff0c\u4e00\u4e2a\u53f6\u5b50\u8282\u70b9\u80fd\u5b58\u653e\u7684\u8bb0\u5f55\u6570\u5c31\u662f16K\/1K=16\u3002<\/p>\n\n\n\n

\u7136\u540e\u518d\u8ba1\u7b97\u975e\u53f6\u5b50\u8282\u70b9\uff1a<\/strong><\/p>\n\n\n\n

\u975e\u53f6\u5b50\u8282\u70b9\u53ef\u4ee5\u5b58\u653e\u591a\u5c11\u4e2a\u6307\u9488\u5462\uff1f<\/p>\n\n\n\n

\u5047\u8bbe\u4e3b\u952eID\u662f\u7d22\u5f15\uff0c\u5b83\u7684\u6570\u636e\u7c7b\u578b\u4e3abigint\uff0c\u957f\u5ea6\u662f8B\u3002<\/p>\n\n\n\n

InnoDB\u4e2d\u4e00\u4e2a\u6307\u9488\u7684\u5927\u5c0f\u662f6B\u3002<\/p>\n\n\n\n

8B+6B=14B\uff0c\u4e5f\u5c31\u662f14\u4e2a\u5b57\u8282\u3002<\/p>\n\n\n\n

\u6240\u4ee5\u53ef\u4ee5\u8ba1\u7b97\u51fa\uff0c\u6307\u9488\u6570=16KB\/14B=16 * 1024 \/ 14 = 1170.28571\uff0c\u5927\u7ea6\u662f1170\u4e2a\u6307\u9488\u3002<\/p>\n\n\n\n

\n\n\n\n

\u56e0\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u5f97\u51fa\uff0c\u4e00\u9897\u4e24\u5c42\u9ad8\u7684 B+Tree \u5927\u7ea6\u53ef\u4ee5\u5b58\u653e 1170 * 16 =18720 \u6761\u8bb0\u5f55\u3002<\/p>\n\n\n\n

\u4ee5\u6b64\u7c7b\u63a8\uff0c\u4e00\u9897\u4e09\u5c42\u9ad8\u7684 B+Tree \u5927\u7ea6\u53ef\u4ee5\u5b58\u653e 1170 * 1170 * 16 = 21902400 \u6761\u8bb0\u5f55\u3002<\/p>\n\n\n\n

\u6240\u4ee5\u5728InnoDB\u4e2d B+\u6811 \u9ad8\u5ea6\u4e00\u822c\u4e3a2-3\u5c42\uff0c\u53ef\u4ee5\u6ee1\u8db3\u5343\u4e07\u7ea7\u7684\u6570\u636e\u5b58\u50a8\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

B+Tree\u7d22\u5f15 \u6309\u987a\u5e8f\u5b58\u50a8\uff0c\u6bcf\u4e00\u4e2a\u53f6\u5b50\u8282\u70b9\u5230\u6839\u7ed3\u70b9\u7684\u8ddd\u79bb\u662f\u76f8\u540c\u7684\uff1b\u5de6\u524d\u7f00\u7d22\u5f15\uff0c\u9002\u5408\u67e5\u8be2\u8303\u56f4\u7c7b\u7684\u6570\u636e\u3002 \u5728InnoDB\u5b58\u50a8\u5f15\u64ce\u4e2d\uff0c\u4e00\u9897\u7684B+\u6811\u53ef\u4ee5\u5b58\u653e\u591a\u5c11\u884c\u6570\u636e\uff1f \u6211\u4eec\u53ef\u4ee5\u5927\u6982\u7684\u4f30\u7b97\u4e00\u4e0b \u5047\u8bbe\u4e00\u9897B+\u6811\u7684\u9ad8\u5ea6\u4e3a2\u5c42\uff0c\u5373\u6709\u4e00\u4e2a\u6839\u8282\u70b9\u548c\u82e5\u5e72\u4e2a\u53f6…<\/p>\n","protected":false},"author":1,"featured_media":283,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[36],"topic":[],"class_list":["post-334","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-35","tag-mysql"],"_links":{"self":[{"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/posts\/334","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=334"}],"version-history":[{"count":3,"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/posts\/334\/revisions"}],"predecessor-version":[{"id":338,"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/posts\/334\/revisions\/338"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/media\/283"}],"wp:attachment":[{"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=334"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=334"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=334"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftopic&post=334"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}