{"id":283,"date":"2021-12-05T22:56:30","date_gmt":"2021-12-05T14:56:30","guid":{"rendered":"http:\/\/qqiuklele.cn\/?p=283"},"modified":"2025-03-26T15:17:50","modified_gmt":"2025-03-26T07:17:50","slug":"%e6%95%b0%e6%8d%ae%e5%ba%93%e9%82%a3%e4%ba%9b%e7%9f%a5%e8%af%86%e7%90%86%e8%a7%a3%e5%92%8c%e6%80%bb%e7%bb%93%ef%bc%88mysql%ef%bc%89","status":"publish","type":"post","link":"https:\/\/qqiukulele.cn\/?p=283","title":{"rendered":"\u6570\u636e\u5e93\u90a3\u4e9b\u77e5\u8bc6\u7406\u89e3\u548c\u603b\u7ed3\uff08Mysql\uff09"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Mysql\u7684\u7d22\u5f15<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u666e\u901a\u7d22\u5f15\u662f\u6700\u57fa\u672c\u7684\u7d22\u5f15\uff0c\u5b83\u6ca1\u6709\u4efb\u4f55\u9650\u5236\uff0c\u503c\u53ef\u4ee5\u4e3a\u7a7a\uff1b\u4ec5\u52a0\u901f\u67e5\u8be2\u3002\u53ef\u4ee5\u76f4\u63a5create 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class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/\u56fe1.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"693\" height=\"181\" data-original=\"http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/\u56fe1.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-293\"  sizes=\"auto, (max-width: 693px) 100vw, 693px\" \/><\/div><\/figure>\n\n\n\n<p>\u5982\u679c\u6211\u6709\u4e00\u4e2aSQL\u8bed\u53e5\u662f\uff1aselect*from Table\uff0c\u5176\u4e2did=15\uff0c\u90a3\u4e48\u5728\u6ca1\u6709\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\uff0c\u5b83\u5b9e\u9645\u8981\u8fdb\u884c\u4e00\u4e2a\u5b8c\u6574\u7684\u8868\u626b\u63cf\uff0c\u76f4\u5230\u6211\u627e\u5230id=15\u7684\u8bb0\u5f55\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u662fO\uff08N\uff09\uff1b\u5982\u679c\u662f\u67e5\u8be2\u7d22\u5f15\u7684\u60c5\u51b5\u3002\u9996\u5148\uff0c\u6839\u636eID=15\uff0c\u5728\u7d22\u5f15\u503c\u4e2d\u6267\u884c\u4e8c\u5206\u67e5\u627e\uff0c\u4e8c\u5206\u67e5\u627e\u7684\u6548\u7387\u975e\u5e38\u9ad8\u3002\u5176\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO\uff08logn\uff09\uff1b<\/p>\n\n\n\n<p>\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\uff0c\u4f46\u662f\u7d22\u5f15\u6570\u636e\u91cf\u4e5f\u6bd4\u8f83\u5927\uff0c\u6240\u4ee5\u5b83\u4e00\u822c\u4e0d\u5b58\u50a8\u5728\u5185\u5b58\u4e2d\uff0c\u76f4\u63a5\u5b58\u50a8\u5728\u78c1\u76d8\u4e2d\u3002<\/p>\n\n\n\n<p>\u6211\u4eec\u4e0a\u9762\u8bf4\u4e86\uff0c\u7d22\u5f15\u6570\u636e\u5b58\u50a8\u5728\u78c1\u76d8\u4e2d\uff0c\u4f46\u662f\u6211\u4eec\u64cd\u4f5c\u6570\u636e\u8fd8\u662f\u5f97\u5728\u5185\u5b58\u5f53\u4e2d\u64cd\u4f5c\u7684\u3002\u5982\u679c\u78c1\u76d8\u4e2d\u7684\u6570\u636e\u91cf\u5f88\u5927\uff0c\u4e0d\u80fd\u4e00\u6b21\u6027\u5199\u5165\u5185\u5b58\uff0c\u5c31\u5f97\u6d89\u53ca\u591a\u6b21io\u64cd\u4f5c\uff0c\u56e0\u6b64\u826f\u597d\u7684\u7d22\u5f15\u6570\u636e\u7ed3\u6784\uff0c\u53ef\u4ee5\u6362\u6765\u6b21\u6570\u8f83\u5c11\u7684\u78c1\u76d8IO\u6b21\u6570\u3002\u6bcf\u4e2aio\u8bfb\u5199\u64cd\u4f5c\u90fd\u662f\u4ee5\u9875\u4e3a\u5355\u4f4d\u8fdb\u884c\u7684\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Hash<\/h3>\n\n\n\n<p>MySQL\u5b9e\u9645\u6709\u4e24\u79cd\u7d22\u5f15\u7c7b\u578b\u53bb\u9009\u62e9\uff0c\u4e00\u4e2a\u662fB+Tree\u7684\u7c7b\u578b\uff0c\u8fd8\u6709\u4e00\u4e2a\u5c31\u662fHash\u7c7b\u578b\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/\u54c8\u5e0c\u7d22\u5f15.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/\u54c8\u5e0c\u7d22\u5f15.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<p>\u54c8\u5e0c\u7d22\u5f15\u5c31\u662f\u91c7\u7528\u4e00\u5b9a\u7684\u54c8\u5e0c\u7b97\u6cd5\uff0c\u628a\u952e\u503c\u6362\u7b97\u6210\u65b0\u7684\u54c8\u5e0c\u503c\uff0c\u68c0\u7d22\u65f6\u4e0d\u9700\u8981\u7c7b\u4f3cB+\u6811\u90a3\u6837\u4ece\u6839\u8282\u70b9\u5230\u53f6\u5b50\u8282\u70b9\u9010\u7ea7\u67e5\u627e\uff0c\u53ea\u9700\u4e00\u6b21\u54c8\u5e0c\u7b97\u6cd5\u5373\u53ef\u7acb\u523b\u5b9a\u4f4d\u5230\u76f8\u5e94\u7684\u4f4d\u7f6e\uff0c\u5b9a\u4f4d\u901f\u5ea6\u975e\u5e38\u5feb\u3002\u5982\u679c\u662f\u7b49\u503c\u67e5\u8be2\uff0c\u90a3\u4e48\u54c8\u5e0c\u7d22\u5f15\u660e\u663e\u6709\u7edd\u5bf9\u4f18\u52bf\uff0c\u56e0\u4e3a\u53ea\u9700\u8981\u7ecf\u8fc7\u4e00\u6b21\u7b97\u6cd5\u5373\u53ef\u627e\u5230\u76f8\u5e94\u7684\u952e\u503c\uff1b\u524d\u63d0\u662f\u952e\u503c\u90fd\u662f\u552f\u4e00\u7684\u3002\u5982\u679c\u952e\u503c\u4e0d\u662f\u552f\u4e00\u7684\uff0c\u5c31\u9700\u8981\u5148\u627e\u5230\u8be5\u952e\u6240\u5728\u4f4d\u7f6e\uff0c\u7136\u540e\u518d\u6839\u636e\u94fe\u8868\u5f80\u540e\u626b\u63cf\uff0c\u76f4\u5230\u627e\u5230\u76f8\u5e94\u7684\u6570\u636e\uff0c\u4e5f\u5c31\u662f\u8bf4\u5728\u6709\u5927\u91cf\u91cd\u590d\u952e\u503c\u60c5\u51b5\u4e0b\uff0c\u54c8\u5e0c\u7d22\u5f15\u7684\u6548\u7387\u4e5f\u662f\u6781\u4f4e\u7684\uff0c\u56e0\u4e3a\u5b58\u5728\u54c8\u5e0c\u78b0\u649e\u95ee\u9898\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u662f\u8303\u56f4\u67e5\u8be2\u68c0\u7d22\uff0c\u8fd9\u65f6\u5019\u54c8\u5e0c\u7d22\u5f15\u5c31\u6beb\u65e0\u7528\u6b66\u4e4b\u5730\u4e86\uff0c\u56e0\u4e3a\u539f\u5148\u662f\u6709\u5e8f\u7684\u952e\u503c\uff0c\u7ecf\u8fc7\u54c8\u5e0c\u7b97\u6cd5\u540e\uff0c\u6709\u53ef\u80fd\u53d8\u6210\u4e0d\u8fde\u7eed\u7684\u4e86\uff0c\u5c31\u6ca1\u529e\u6cd5\u518d\u5229\u7528\u7d22\u5f15\u5b8c\u6210\u8303\u56f4\u67e5\u8be2\u68c0\u7d22\uff1b\u54c8\u5e0c\u7d22\u5f15\u4e5f\u6ca1\u529e\u6cd5\u5229\u7528\u7d22\u5f15\u5b8c\u6210\u6392\u5e8f\uff0c\u4ee5\u53calike \u2018xxx%\u2019 \u8fd9\u6837\u7684\u90e8\u5206\u6a21\u7cca\u67e5\u8be2\uff08\u8fd9\u79cd\u90e8\u5206\u6a21\u7cca\u67e5\u8be2\uff0c\u5176\u5b9e\u672c\u8d28\u4e0a\u4e5f\u662f\u8303\u56f4\u67e5\u8be2\uff09\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\u4e61innoDB\u9ed8\u8ba4\u91c7\u7528\u7684\u5b58\u50a8\u7ed3\u6784\u662fB+Tree\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">B-Tree<\/h3>\n\n\n\n<p>B\u6811\u662f\u4e00\u4e2a\u5e73\u8861\u7684\u591a\u53c9\u6811\uff08\u907f\u514d\u4e86\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO\uff08N\uff09\u7684\u5355\u5411\u94fe\u8868\u6811\uff09\uff0c\u82f1\u6587\u662fbalance binary tree. \u4ece\u6839\u8282\u70b9\u5230\u6bcf\u4e2a\u53f6\u5b50\u8282\u70b9\u7684\u9ad8\u5ea6\u5dee\u503c\u4e0d\u8d85\u8fc71\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/BTree.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/BTree.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" style=\"aspect-ratio:1;width:840px;height:auto\"\/><\/div><\/figure>\n\n\n\n<p>\u5728\u4e00\u822cB-\u6811\u4e2d\uff0c\u4e00\u4e2a\u8282\u70b9\u4e2d\u6709\u591a\u5c11\u5b50\u8282\u70b9\uff0c\u6211\u4eec\u79f0\u4e3a\u591a\u5c11\u9636B-\u6811\u3002\u4ee5\u4e0a\u662f\u4e00\u4e2a4\u9636\u7684b-tree\u3002<\/p>\n\n\n\n<p>\u63a5\u4e0b\u6765\u5c31\u770b\u770bb-tree\u662f\u600e\u4e48\u67e5\u627e\u6570\u636e\u7684\u5427\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c\u67e5\u8be2ID=7\u7684\u6570\u636e\uff0c\u9996\u5148\u5c06\u5173\u952e\u5b5720\u7684\u8282\u70b9\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\uff0c\u7136\u540e\u5b83\u6bd4\u8f83\u786e\u5b9a7\u6bd412\u5c0f\uff1b<\/li>\n\n\n\n<li>\u7136\u540e\u52a0\u8f7d\u7b2c\u4e00\u4e2a\u5b50\u8282\u70b9\uff0c\u5982\u679c\u67e5\u8be2\u6570\u636e\u7b49\u4e8e12\u621617\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\uff1b\u4e0d\u7b49\u4e8e\u5c31\u7ee7\u7eed\u67e5\u627e\uff0c\u67e5\u627e\u6bd412\u5c0f\u76847\u6570\u636e\uff1b<\/li>\n\n\n\n<li>\u7136\u540e\uff0c\u7ee7\u7eed\u52a0\u8f7d\u7b2c\u4e00\u4e2a\u5b50\u8282\u70b9\uff0c\u5728\u627e\u52307\u540e\uff0c\u8fd4\u56de7\u4e0b\u9762\u7684\u6570\u636eDATA\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u56e0\u6b64\uff0c\u6574\u4e2a\u64cd\u4f5c\u5df2\u7ecf\u6267\u884c\u4e863\u4e2aIO\u64cd\u4f5c\uff0c\u4f46\u5b9e\u9645\u4e0a\uff0c\u4e00\u822c\u7684B-\u6811\u6709\u5f88\u591a\u5206\u652f\uff08\u901a\u5e38\u5927\u4e8e100\uff09\u3002<\/p>\n\n\n\n<p>\u4e3a\u4e86\u66f4\u597d\u5730\u5229\u7528\u78c1\u76d8\u7684IO\u80fd\u529b\uff0cMysql\u8bbe\u7f6e\u6bcf\u4e2a\u8282\u70b9\u7684\u5927\u5c0f\u4e3a16K\u3002\u5982\u679c\u6bcf\u4e2a\u8282\u70b9\u4e2d\u7684\u5173\u952e\u5b57\u4e3aint\u7c7b\u578b\uff0c\u5219\u4e3a4\u5b57\u8282\uff0c\u5982\u679c\u6570\u636e\u533a\u57df\u7684\u5927\u5c0f\u4e3a8\u5b57\u8282\uff0c\u5219\u8282\u70b9\u6307\u9488\u53604\u5b57\u8282\uff0c\u5219B\u6811\u7684\u6bcf\u4e2a\u8282\u70b9\u53ef\u4fdd\u5b58\u7684\u5173\u952e\u5b57\u6570\u4e3a\uff1a\uff0816*1000\uff09\/\uff084+8+4\uff09=1000\u3002\u6bcf\u4e2a\u8282\u70b9\u6700\u591a\u53ef\u5b58\u50a81000\u4e2a\u5173\u952e\u5b57\uff0c\u6bcf\u4e2a\u8282\u70b9\u6700\u591a\u53ef\u67091001\u4e2a\u5206\u652f\u8282\u70b9\u3002<\/p>\n\n\n\n<p>\u8fd9\u6837\uff0c\u5f53\u67e5\u8be2\u7d22\u5f15\u6570\u636e\u65f6\uff0c\u4e00\u6b21\u6027\u78c1\u76d8IO\u64cd\u4f5c\u53ef\u4ee5\u8ba1\u7b971000\u4e2a\u5173\u952e\u5b57\uff0c\u8bfb\u5165\u5185\u5b58\u3002\u6240\u4ee5\u4e3a\u4ec0\u4e48\u8bf4\u7d22\u5f15\u7684\u7c7b\u578b\u8981\u9009\u5b57\u8282\u5c0f\u7684\u7c7b\u578b\u3002<\/p>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff1aB-\u6811\u4e3a\u4e86\u4fdd\u8bc1\u6570\u636e\u7684\u5e73\u8861\uff0c\u5b83\u4f1a\u505a\u4e00\u7cfb\u5217\u7684\u64cd\u4f5c\u3002\u8fd9\u4fdd\u6301\u4e86\u4e00\u4e2a\u5e73\u8861\u7684\u5904\u7406\u65f6\u95f4\uff0c\u56e0\u6b64\u521b\u5efa\u7d22\u5f15\u592a\u591a\u65f6\u7684\u66f4\u65b0\u7d22\u5f15\u7684\u8fc7\u7a0b\u4e5f\u5f88\u8017\u65f6\u3002<\/p>\n\n\n\n<p>\u8fd8\u6709\u5c31\u662f\u95ee\u4e3a\u5565\u4e0d\u9009\u62e9\u4f4e\u533a\u57df\u7d22\u5f15\u5b57\u6bb5\u503c\u4f5c\u4e3a\u7d22\u5f15\uff0c\u4f8b\u5982\u4e00\u4e2a\u6027\u522b\u5b57\u6bb5\uff0c\u603b\u5171\u4e24\u4e2a\u503c\uff0c\u8fd9\u6837\u53ef\u80fd\u4f1a\u5bfc\u81f4B\u6811\u7684\u6df1\u5ea6\u8fc7\u5927\uff0c\u7d22\u5f15\u6548\u7387\u964d\u4f4e\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">B+Tree<\/h3>\n\n\n\n<p>B-Tree\u5462\u7684\u6811\u7684\u9ad8\u5ea6\u8fd8\u662f\u53ef\u80fd\u5f88\u9ad8\uff0c\u6240\u4ee5\u8fd8\u53ef\u4ee5\u91c7\u7528B+Tree\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/\u771f\u6b63\u7684BTree.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/\u771f\u6b63\u7684BTree.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<p>\u5f53\u67e5\u8be2\u6570\u636e\u65f6\uff0cb+tree\u91c7\u7528\u5de6\u95ed\u53f3\u5f00\u7684\u539f\u5219\uff0c\u7136\u540e\u975e\u53f6\u5b50\u8282\u70b9\u5b58\u50a8key\uff0c\u4e0d\u4f1a\u5b58\u50a8data\u7684\uff0c\u53f6\u5b50\u8282\u70b9\u5b58\u50a8key\u548c\u6570\u636e\uff0c\u800c\u4e14\u8981\u5c3d\u91cf\u51cf\u5c11key\u503c\u7684\u5360\u7528\u7a7a\u95f4\uff08\u540c\u7406\u4e0a\u9762\u6240\u4ecb\u7ecd\u7684\uff09\u3002<\/p>\n\n\n\n<p>\u8ba9\u6211\u4eec\u770b\u770b\u6570\u636e\u67e5\u8be2\u662f\u5982\u4f55\u5728B+\u6811\u4e2d\u8fdb\u884c\u7684\uff1a<\/p>\n\n\n\n<p>\u73b0\u5728\u5220\u9664ID=2\u7684\u6570\u636e\uff0c\u7136\u540e\u5148\u53d6\u6839\u8282\u70b9\uff0c\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\uff0c\u53d1\u73b0\u6839\u8282\u70b9\u4e0a\u5b58\u5728ID=2\uff0c\u56e0\u4e3a\u5b83\u662f\u5de6\u95ed\u533a\u95f4\u5b58\u50a8\u6570\u636e\uff0c\u6240\u4ee5id&lt;=2\u7684\u90fd\u5728\u6839\u8282\u70b9\u7684\u7b2c\u4e00\u4e2a\u5b50\u8282\u70b9\u4e0a\uff1b<\/p>\n\n\n\n<p>\u56e0\u6b64\uff0c\u53d6\u7b2c\u4e00\u4e2a\u5b50\u8282\u70b9\uff0c\u5c06\u5176\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\uff0c\u53d1\u73b0\u5f53\u524d\u8282\u70b9\u5b58\u5728\u3002id=2\u8fd9\u4e2a\u5173\u952e\u5b57\u5df2\u5230\u8fbe\u53f6\u5b50\u8282\u70b9\uff0c\u7136\u540e\u76f4\u63a5\u5220\u9664\u53f6\u5b50\u8282\u70b9\u4e2d\u7684\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u4e5f\u5c31\u662f\u8bf4\u67e5\u627e\u8fc7\u7a0b\u5c31\u662f\u5148\u901a\u8fc7\u76ee\u5f55\u9879\u6570\u636e\u9875\u5b9a\u4f4d\u771f\u5b9e\u6570\u636e\u5b58\u653e\u5728\u54ea\u4e2a\u53f6\u5b50\u8282\u70b9\u6570\u636e\u9879\u3002\u4e14B+tree\u7684\u9ad8\u5ea6\u5e73\u5747\u662f3-4\u5c42\uff0c\u56e0\u4e3aB+tree\u6bcf\u4e2a\u8282\u70b9\u53ef\u4ee5\u5b58\u653e\u66f4\u591a\u7684\u8282\u70b9\uff0c\u4e5f\u5c31\u662f\u53ef\u4ee5\u5b58\u653e\u5f88\u591akey\uff0c\u56e0\u6b64\u5c31\u964d\u4f4e\u4e86\u6811\u7684\u9ad8\u5ea6\uff0c\u8fd9\u4e0d\u5c31\u51cf\u5c11\u4e86\u78c1\u76d8io\u8bfb\u5199\u3002\u5355\u4e2aio\u8bfb\u5199\u8bfb\u53d6\u4e00\u4e2anode\uff0c\u4e00\u4e2anode\u5305\u542b\u90a3\u4e48\u591akey\u3002\u6240\u4ee5\u4e0e\u5e73\u8861\u4e8c\u53c9\u6811\u76f8\u6bd4\uff0cB+Tree\u7684\u67e5\u8be2\u6548\u7387\u66f4\u9ad8\u3002<\/p>\n\n\n\n<p>\u8fd8\u6709\u5c31\u662fB+\u6811\u7684\u53f6\u5b50\u8282\u70b9\u662f\u987a\u5e8f\u7684\uff0c\u76f8\u90bb\u7684\u4e24\u4e2a\u53f6\u5b50\u8282\u70b9\u6709\u987a\u5e8f\u5f15\u7528\uff0c\u53ef\u4ee5\u66f4\u597d\u5730\u652f\u6301\u8303\u56f4\u67e5\u8be2\u3002B-\u6811\u662f\u4e0d\u5b58\u5728\u8fd9\u79cd\u987a\u5e8f\u5173\u7cfb\u7684\u3002<\/p>\n\n\n\n<p>B+Tree\u7684\u67e5\u8be2\u6548\u679c\u4e5f\u6700\u7a33\u5b9a\uff0c\u56e0\u4e3a\u6240\u6709\u67e5\u8be2\u90fd\u9700\u8981\u626b\u63cf\u5230\u53f6\u5b50\u8282\u70b9\u624d\u80fd\u8fd4\u56de\u6570\u636e\u3002\u4f46\u4e0d\u4e00\u5b9a\u662f\u6700\u4f18\uff0c\u56e0\u4e3a\u5982\u679c\u76f4\u63a5\u67e5\u8be2B\u6811\u7684\u6839\u8282\u70b9\u6570\u636e\uff0cB\u6811\u53ea\u9700\u76f4\u63a5\u8fd4\u56de\u6570\u636e\uff0c\u6548\u679c\u6700\u597d\u3002<\/p>\n\n\n\n<p>\u7ecf\u8fc7\u5206\u6790\uff0cMySQL\u6700\u7ec8\u9009\u62e9B+\u6811\u4f5c\u4e3a\u5176\u7d22\u5f15\u7684\u6570\u636e\u7ed3\u6784\u3002<\/p>\n\n\n\n<p>\u8865\u5145\uff1auuid\u662f128\u4f4d\u7684\u901a\u7528\u552f\u4e00\u6807\u8bc6\u7b26\uff0cjava\u91cc\u6709UUID\u7684\u7c7b\u5e2e\u52a9\u628astring\u751f\u6210\u6807\u8bc6\u7b26\u3002mysql\u4e0d\u8981\u7528uuid\u7528\u81ea\u589e\u4e3b\u952e\uff0c\u56e0\u4e3ainnodb\u7684\u7d22\u5f15\u7279\u6027\u5bfc\u81f4\u4e86\u81ea\u589eid\u505a\u4e3b\u952e\u662f\u6548\u7387\u6700\u597d\u7684\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Mysql\u7684\u5e38\u89c1\u4e24\u79cd\u5b58\u50a8\u5f15\u64ce<\/h2>\n\n\n\n<p>\u4e3b\u8981\u6709MyisAM\u548cinnodb\u4e24\u79cd\u5b58\u50a8\u5f15\u64ce\u3002\u4e0d\u540c\u5b58\u50a8\u5f15\u64ce\u5c31\u6709\u4e0d\u540c\u7684\u5b58\u50a8\u673a\u5236\u548c\u7d22\u5f15\u6280\u5de7\uff0c\u6211\u4eec\u53ef\u4ee5SHOW ENGINES\u53bb\u67e5\u770b\u7cfb\u7edf\u6240\u652f\u6301\u7684\u5f15\u64ce\u7c7b\u578b\u3002\u50cfinooDB\u5c31\u662fMysql\u9ed8\u8ba4\u7684\u5b58\u50a8\u5f15\u64ce\u3002<\/p>\n\n\n\n<p>\u9996\u5148\uff0c\u6253\u5f00\u67e5\u8be2\u53ef\u4ee5\u5148\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\u67e5\u8be2\u5b58\u50a8\u6570\u636e\u7684\u76ee\u5f55\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">show variables like '%datadir%'<\/pre>\n\n\n\n<p>\u6211\u7684\u7535\u8111\u4e2dMySQL\u7684\u5185\u5b58\u6570\u636e\u7684\u76ee\u5f55\u4e3a\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/\u56fe2.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/\u56fe2.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<p>\u7136\u540e\u8fdb\u5165\u90a3\u4e2a\u6587\u4ef6\u5939\uff0c\u968f\u4fbf\u8fdb\u5165\u4e00\u4e2a\u6570\u636e\u5e93\u6587\u4ef6\u5939\uff0c\u53ef\u4ee5\u770b\u5230\u8bb8\u591a\u540e\u7f00\u540d\u4e3a.idb\u7684\u6587\u4ef6\uff0c\u4e5f\u5c31\u662f\u8bf4\u6211\u5efa\u8868\u7684\u65f6\u5019\u4f7f\u7528\u7684\u662finnodb\u7684\u5f15\u64ce\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/ibd.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/ibd.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<p>InnoDB\u5f15\u64ce\u7684\u8868\u6587\u4ef6\u6709\u4e24\u4e2a\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>*.frm\u6b64\u7c7b\u578b\u7684\u6587\u4ef6\u662f\u8868\u7684\u5b9a\u4e49\u6587\u4ef6\u3002<\/li>\n\n\n\n<li>*.IBD\u8fd9\u79cd\u7c7b\u578b\u7684\u6587\u4ef6\u662f\u6570\u636e\u548c\u7d22\u5f15\u5b58\u50a8\u6587\u4ef6\u3002\u8868\u6570\u636e\u548c\u7d22\u5f15\u805a\u5408\u5b58\u50a8\uff0c\u76f4\u63a5\u6309\u7d22\u5f15\u67e5\u8be2\u6570\u636e\u3002<\/li>\n<\/ul>\n\n\n\n<p>Myiasm\u5f15\u64ce\u7684\u8868\u6587\u4ef6\uff0c\u6709\u4e09\u4e2a\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>*.frm\u6b64\u7c7b\u578b\u7684\u6587\u4ef6\u662f\u8868\u7684\u5b9a\u4e49\u6587\u4ef6\u3002<\/li>\n\n\n\n<li>*.Myd\u6b64\u7c7b\u578b\u7684\u6587\u4ef6\u662f\u8868\u6570\u636e\u6587\u4ef6\uff0c\u8868\u4e2d\u7684\u6240\u6709\u6570\u636e\u90fd\u4fdd\u5b58\u5728\u6b64\u6587\u4ef6\u4e2d\u3002<\/li>\n\n\n\n<li>*.Myi\u6b64\u7c7b\u6587\u4ef6\u662f\u8868\u7684\u7d22\u5f15\u6587\u4ef6\uff0cMyISAM\u5b58\u50a8\u5f15\u64ce\u7684\u7d22\u5f15\u6570\u636e\u5355\u72ec\u5b58\u50a8\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u8981\u662f\u4e0d\u60f3\u4f7f\u7528\u9ed8\u8ba4\u7684innodb\uff0c\u53ef\u4ee5\u6307\u5b9aENGINE\u7684\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">InnoDB vs MyISAM<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>InnoDB\u6709\u884c\u7ea7\u9501\uff0c\u884c\u9501\u5b9a\u5bf9\u4e8e\u5177\u6709\u591a\u4e2a\u7528\u6237\u7684\u6570\u636e\u5e93\u5f88\u6709\u7528\u3002\u884c\u7ea7\u9501\u5b9a\u7684\u552f\u4e00\u7f3a\u70b9\u662f\u5360\u7528\u5927\u91cf\u5185\u5b58\uff0c\u67e5\u8be2\u548c\u4fee\u6539\u6570\u636e\u9700\u8981\u65f6\u95f4\u3002MyISAM\u53ea\u6709\u8868\u7ea7\u9501\uff0c\u53ea\u5141\u8bb8\u5355\u4f1a\u8bdd\u4fee\u6539\u8868\uff0c\u5f88\u9002\u5408\u53ea\u8bfb\u6570\u636e\u5e93\uff0c\u56e0\u4e3a\u4e0d\u9700\u8981\u90a3\u4e48\u591a\u5185\u5b58\u3002<\/li>\n\n\n\n<li>InnoDB\u5177\u6709\u6240\u8c13\u7684\u5f15\u7528\u5b8c\u6574\u6027\uff0c\u5b83\u5305\u62ec\u652f\u6301\u5916\u952e\uff08RDBMS\uff09\u548c\u5173\u7cfb\u7ea6\u675f\uff0c\u800cMyISAM\u4e0d\u652f\u6301\uff08DMB\uff09\u3002<\/li>\n\n\n\n<li>InnoDB\u652f\u6301\u4e8b\u52a1\u54df\uff0c\u5c31\u662f\u53ef\u4ee5\u63d0\u4ea4\u4e8b\u52a1\u3001\u56de\u6eda\u4e8b\u52a1\uff0c\u4f46\u662fMyISAM\u4e0d\u53ef\u4ee5\u3002<\/li>\n\n\n\n<li>InnoDB\u66f4\u53ef\u9760\uff0c\u56e0\u4e3a\u5b83\u4f7f\u7528\u4e8b\u52a1\u65e5\u5fd7\u8fdb\u884c\u81ea\u52a8\u6062\u590d\u3002MyISAM\u6ca1\u6709\u3002<\/li>\n\n\n\n<li>InnoDB\u652f\u6301ACID\u5c5e\u6027\uff0c\u800cMyISAM\u4e0d\u652f\u6301ACID\u5c5e\u6027\u3002<\/li>\n\n\n\n<li>InnoDB\u5177\u6709\u66f4\u9ad8\u7684\u5199\u5165\u901f\u5ea6\u3002\u4e0eMyISAM\u76f8\u6bd4\uff0cInnoDB\u5bf9\u4e8e\u5927\u5bb9\u91cf\u6570\u636e\u7684\u6027\u80fd\u66f4\u597d\u3002MyISAM\u4e0d\u652f\u6301\u4e8b\u52a1\u5c5e\u6027\uff0c\u8bfb\u53d6\u901f\u5ea6\u66f4\u5feb\u3002\u4e0eInnoDB\u76f8\u6bd4\uff0c\u9ad8\u5bb9\u91cf\u6570\u636e\u7684\u6027\u80fd\u66f4\u4f4e\u3002<\/li>\n\n\n\n<li>InnoDB\u5f15\u64ce\u6709buffer pool\uff1a\u7f13\u5b58\u6570\u636e\u548c\u7d22\u5f15\uff1bMyisam\u5f15\u64ce\u6709Key Cache\uff1a\u4e13\u95e8\u7f13\u5b58\u7d22\u5f15\uff0c\u6dd8\u6c70\u7b97\u6cd5\u90fd\u662fLRU\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u6d89\u53ca\u5230\u5927\u6570\u636e\u91cf\u7684\u6392\u5e8f\u3001\u5168\u8868\u626b\u63cf\u3001count\u4e4b\u7c7b\u7684\u64cd\u4f5c\u7684\u8bdd\uff0c\u8fd8\u662fMyISAM\u5360\u4f18\u52bf\u4e9b\uff0c\u56e0\u4e3aMyISAM\u6709\u4fdd\u5b58\u8868\u7684\u6570\u636e\u884c\u6570\u3002\u8fd8\u56e0\u4e3a\u7d22\u5f15\u6240\u5360\u7a7a\u95f4\u5c0f\uff0c\u8fd9\u4e9b\u64cd\u4f5c\u662f\u9700\u8981\u5728\u5185\u5b58\u4e2d\u5b8c\u6210\u7684\u3002<\/li>\n\n\n\n<li>InnoDB\u4f7f\u7528\u805a\u7c07\u7d22\u5f15\uff0cMyISAM\u4f7f\u7528\u7684\u662f\u975e\u805a\u7c07\u7d22\u5f15\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u6700\u540e\u8bf4\u5230\u7684\u805a\u7c07\u7d22\u5f15\u548c\u975e\u805a\u7c07\u7d22\u5f15\uff0c\u4e5f\u8981\u8be6\u7ec6\u603b\u7ed3\u4e00\u4e0b\u3002<\/p>\n\n\n\n<p>\u4f7f\u7528MyISAM\u5b58\u50a8\u5f15\u64ce\u65f6\uff0c\u7d22\u5f15\u548c\u6570\u636e\u5355\u72ec\u5206\u5f00\u5b58\u50a8\uff0c\u7d22\u5f15\u7ed3\u6784B+\u6811\u6700\u7ec8\u6307\u5411\u6570\u636e\u7684\u7269\u7406\u5730\u5740\uff0c\u800c\u4e0d\u662f\u7279\u5b9a\u6570\u636e\u3002\u9700\u8981\u6839\u636e\u6570\u636e\u6587\u4ef6\uff08*.myd\uff09\u7684\u7269\u7406\u5730\u5740\u67e5\u627e\u7279\u5b9a\u6570\u636e\u3002\uff08\u6211\u770b\u5230\u7f51\u4e0a\u5f88\u591a\u5f88\u591a\u5176\u4ed6\u535a\u5ba2\u8bf4M\u6709ISAM\u4f7f\u7528\u7684\u975e\u805a\u7c07\u7d22\u5f15\uff0c\u4f46\u662f\u6211\u5b66\u4e60\u4e86\u4e00\u4e0b\uff0c\u611f\u89c9\u8fd8\u662f\u6709\u533a\u522b\u7684\u5440\u3002\uff09<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/\u975e\u805a\u7c07\u7d22\u5f15.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/\u975e\u805a\u7c07\u7d22\u5f15.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<p>\u5982\u679c\u6709\u591a\u4e2a\u7d22\u5f15\uff0c\u4f1a\u6307\u5411\u540c\u4e00\u4e2a\u7269\u7406\u5730\u5740\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/\u975e\u805a\u7c07\u7d22\u5f152.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/\u975e\u805a\u7c07\u7d22\u5f152.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<p>InnoDB\u65e2\u6709\u975e\u805a\u7c07\u7d22\u5f15\u53c8\u6709\u805a\u7c07\u7d22\u5f15\u3002<\/p>\n\n\n\n<p><strong>\u805a\u7c07\u7d22\u5f15<\/strong>\uff1a\u90a3\u4e48\u805a\u7c07\u7d22\u5f15\u5c31\u662f\u5c06\u6570\u636e\u5b58\u50a8\u4e0e\u7d22\u5f15\u653e\u5230\u4e86\u4e00\u5757\u3001\u5e76\u4e14\u662f\u6309\u7167\u4e00\u5b9a\u7684\u987a\u5e8f\u7ec4\u7ec7\u7684\uff0c\u627e\u5230\u7d22\u5f15\u4e5f\u5c31\u627e\u5230\u4e86\u6570\u636e\uff0c\u6570\u636e\u7684\u7269\u7406\u5b58\u653e\u987a\u5e8f\u4e0e\u7d22\u5f15\u987a\u5e8f\u662f\u4e00\u81f4\u7684\uff0c\u5373\uff1a\u53ea\u8981\u7d22\u5f15\u662f\u76f8\u90bb\u7684\uff0c\u90a3\u4e48\u5bf9\u5e94\u7684\u6570\u636e\u4e00\u5b9a\u4e5f\u662f\u76f8\u90bb\u5730\u5b58\u653e\u5728\u78c1\u76d8\u4e0a\u7684\u3002\u4e00\u4e2a\u8868\u53ea\u80fd\u6709\u4e00\u4e2a\u805a\u96c6\u7d22\u5f15\uff0c\u901a\u5e38\u662f\u4e3b\u952e\u4f5c\u4e3a\u805a\u7c07\u7d22\u5f15\u3002\u5982\u679c\u6ca1\u6709\u4e3b\u952e\uff0cINNODB\u9ed8\u8ba4\u4f1a\u751f\u6210\u4e00\u4e2a\u9690\u85cf\u5217\u8868\u4f5c\u4e3a\u4e3b\u952e\u3002\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/\u805a\u7c07\u7d22\u5f15.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/\u805a\u7c07\u7d22\u5f15.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<p><strong>\u975e\u805a\u7c07\u7d22\u5f15<\/strong>\uff1a\u4e5f\u53eb\u4e8c\u7ea7\u7d22\u5f15\u3002\u867d\u7136\u5173\u952e\u5b57\u4e5f\u4fdd\u5b58\u5728B+\u6811\u7684\u6bcf\u4e2a\u5206\u652f\u8282\u70b9\u4e0a\uff0c\u4f46\u53f6\u8282\u70b9\u4e0d\u4fdd\u5b58\u5173\u952e\u5b57\uff0c\u800c\u662f\u4fdd\u5b58\u4e3b\u952e\u503c\u3002\u4f7f\u7528\u4e8c\u7ea7\u7d22\u5f15\u67e5\u8be2\u6570\u636e\u65f6\uff0c\u9996\u5148\u67e5\u8be2\u6570\u636e\u5bf9\u5e94\u7684\u4e3b\u952e\uff0c\u7136\u540e\u6839\u636e\u4e3b\u952e\u67e5\u8be2\u7279\u5b9a\u7684\u6570\u636e\u884c\u3002\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/\u771f\u6b63\u7684\u975e\u805a\u7c07\u7d22\u5f15.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/\u771f\u6b63\u7684\u975e\u805a\u7c07\u7d22\u5f15.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u7d22\u5f15\u5931\u6548\u95ee\u9898<\/h2>\n\n\n\n<p>\u4f7f\u7528\u7d22\u5f15\u5b58\u5728\u4e00\u4e9b\u7ec6\u8282\u548c\u6ce8\u610f\u4e8b\u9879\uff1a<\/p>\n\n\n\n<p><strong>1\uff09\u4e0d\u8981\u5728\u5217\u4e0a\u4f7f\u7528\u51fd\u6570\uff0c\u8fd9\u5c06\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u800c\u8fdb\u884c\u5168\u8868\u626b\u63cf\u3002<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">select * from news where year(publish_time) &lt; 2017<\/pre>\n\n\n\n<p>\u4e3a\u4e86\u4f7f\u7528\u7d22\u5f15\uff0c\u9632\u6b62\u6267\u884c\u5168\u8868\u626b\u63cf\uff0c\u53ef\u4ee5\u8fdb\u884c\u6539\u9020\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">select * from news where publish_time &lt; '2017-01-01'<\/pre>\n\n\n\n<p><strong>2\uff09\u4e0d\u8981\u5728\u5217\u4e0a\u8fdb\u884c\u8fd0\u7b97\uff0c\u8fd9\u4e5f\u5c06\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u800c\u8fdb\u884c\u5168\u8868\u626b\u63cf\u3002<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">select * from news where id \/ 100 = 1<\/pre>\n\n\n\n<p>\u4e3a\u4e86\u4f7f\u7528\u7d22\u5f15\uff0c\u9632\u6b62\u6267\u884c\u5168\u8868\u626b\u63cf\uff0c\u53ef\u4ee5\u8fdb\u884c\u6539\u9020\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">select * from news where id = 1 * 100<\/pre>\n\n\n\n<p><strong>3\uff09\u5c3d\u91cf\u907f\u514d\u4f7f\u7528 \u8d1f\u5411\u6761\u4ef6\u7d22\u5f15!= \u6216 not in\u6216 &lt;&gt; \u7b49\u5426\u5b9a\u64cd\u4f5c\u7b26<\/strong>\uff0c\u53ef\u4ee5\u4f7f\u7528in\u554a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5e94\u8be5\u5c3d\u91cf\u907f\u514d\u5728 where \u5b50\u53e5\u4e2d\u4f7f\u7528 != \u6216 not in \u6216 &lt;&gt; \u64cd\u4f5c\u7b26\uff0c\u56e0\u4e3a\u8fd9\u51e0\u4e2a\u64cd\u4f5c\u7b26\u90fd\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u800c\u8fdb\u884c\u5168\u8868\u626b\u63cf\u3002<\/li>\n\n\n\n<li>\u5e94\u8be5\u5c3d\u91cf\u907f\u514d\u5728 where \u5b50\u53e5\u4e2d\u4f7f\u7528 or \u6765\u8fde\u63a5\u6761\u4ef6\uff0c\u56e0\u4e3a\u8fd9\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u800c\u8fdb\u884c\u5168\u8868\u626b\u63cf\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">select * from news where id = 1 or id = 2<\/pre>\n\n\n\n<p><strong>4\uff09\u590d\u5408\u7d22\u5f15\u7684\u6700\u5de6\u524d\u7f00\u539f\u5219<\/strong><\/p>\n\n\n\n<p>\u590d\u5408\u7d22\u5f15\u9075\u5b88\u201c\u6700\u5de6\u524d\u7f00\u201d\u539f\u5219\uff0c\u5373\u5728\u67e5\u8be2\u6761\u4ef6\u4e2d\u4f7f\u7528\u4e86\u590d\u5408\u7d22\u5f15\u7684\u7b2c\u4e00\u4e2a\u5b57\u6bb5\uff0c\u7d22\u5f15\u624d\u4f1a\u88ab\u4f7f\u7528\u3002\u56e0\u6b64\uff0c\u5728\u590d\u5408\u7d22\u5f15\u4e2d\u7d22\u5f15\u5217\u7684\u987a\u5e8f\u81f3\u5173\u91cd\u8981\u3002\u5982\u679c\u4e0d\u662f\u6309\u7167\u7d22\u5f15\u7684\u6700\u5de6\u5217\u5f00\u59cb\u67e5\u627e\uff0c\u5219\u65e0\u6cd5\u4f7f\u7528\u7d22\u5f15\u3002<\/p>\n\n\n\n<p>\u5047\u8bbe\uff0c\u6709\u4e00\u4e2a\u573a\u666f\u53ea\u9700\u8981\u9488\u5bf9\u8d44\u8baf\u7684\u6708\u4efd\u8fdb\u884c\u67e5\u8be2\uff0c\u90a3\u4e48\uff0cSQL \u8bed\u53e5\u53ef\u4ee5\u5199\u6210\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">select * from news where news_month = 1<\/pre>\n\n\n\n<p>\u6b64\u65f6\uff0c\u65e0\u6cd5\u4f7f\u7528 <code>news_year_month_idx(news_year, news_month)<\/code>\u7d22\u5f15\uff0c\u56e0\u4e3a\u9075\u5b88\u201c\u6700\u5de6\u524d\u7f00\u201d\u539f\u5219\uff0c\u5728\u67e5\u8be2\u6761\u4ef6\u4e2d\u6ca1\u6709\u4f7f\u7528\u590d\u5408\u7d22\u5f15\u7684\u7b2c\u4e00\u4e2a\u5b57\u6bb5\uff0c\u7d22\u5f15\u662f\u4e0d\u4f1a\u88ab\u4f7f\u7528\u7684\u3002<\/p>\n\n\n\n<p><strong>5\uff09like \u8bed\u53e5\u7684\u7d22\u5f15\u5931\u6548\u95ee\u9898<\/strong><\/p>\n\n\n\n<p>like \u7684\u65b9\u5f0f\u8fdb\u884c\u67e5\u8be2\uff0c\u5728 like \u201cvalue%\u201d \u53ef\u4ee5\u4f7f\u7528\u7d22\u5f15\uff0c\u56e0\u4e3a\u7531\u4e8eB+\u6811\u7684\u7d22\u5f15\u987a\u5e8f\uff0c\u662f\u6309\u7167\u9996\u5b57\u6bcd\u7684\u5927\u5c0f\u8fdb\u884c\u6392\u5e8f\uff0c\u524d\u7f00\u5339\u914d\u53c8\u662f\u5339\u914d\u9996\u5b57\u6bcd\uff0c\u6240\u4ee5\u53ef\u4ee5\u5728B+\u6811\u4e0a\u8fdb\u884c\u6709\u5e8f\u7684\u67e5\u627e\uff0c\u67e5\u627e\u9996\u5b57\u6bcd\u7b26\u5408\u8981\u6c42\u7684\u6570\u636e\u3002\u4f46\u662f\u5bf9\u4e8e like \u201c%value%\u201d \u8fd9\u6837\u7684\u65b9\u5f0f\uff0c\u6267\u884c\u5168\u8868\u67e5\u8be2\uff0c<\/p>\n\n\n\n<p>\u81f3\u4e8e\u8bf4\u7d22\u5f15\u4e3a\u4ec0\u4e48\u4f1a\u5931\u6548\uff0c\u56e0\u4e3a\u6211\u4eec\u4e0a\u9762\u5b66\u4e60\u4e86b+\u6811\u5c31\u77e5\u9053\u4e86\uff1a<strong>\u7d22\u5f15\u662f\u6309\u7167\u4e00\u5b9a\u89c4\u5219\u6392\u597d\u5e8f\u7684\uff0c\u5982\u679c\u5bf9\u7d22\u5f15\u5217\u4f7f\u7528\u51fd\u6570\uff0c\u6216\u8005 like % \u674e\uff0c\u5177\u4f53\u7684\u503c\u90fd\u4e0d\u77e5\u9053\uff0c\u5b83\u600e\u4e48\u5728B+\u6811\u4e0a\u52a0\u901f\u67e5\u8be2\uff1f<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8b\u52a1\u7684\u56db\u5927\u7279\u6027<\/h2>\n\n\n\n<p>\u4e8b\u52a1\u6709\u56db\u5927\u7279\u6027\uff08ACID\uff09\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u539f\u5b50\u6027\uff08\u8981\u4e48\u4e00\u8d77\u6267\u884c\uff0c\u8981\u4e48\u4e0d\u6267\u884c\uff09<\/li>\n\n\n\n<li>\u4e00\u81f4\u6027\uff08\u5c31\u662f\u8981\u4fdd\u62a4\u6211\u4eec\u7684\u6570\u636e\u5e93\u5b8c\u6574\u6027\uff0c\u8fd9\u4e2a\u64cd\u4f5c\u554a\u8981\u7b26\u5408\u6570\u636e\u5e93\u7684\u8bbe\u5b9a\uff0c\u4e0d\u80fd\u662f\u4e00\u4e9b\u4e0d\u592a\u5408\u7406\u7684\u64cd\u4f5c\uff0c\u8fd8\u6210\u529f\u4e86\uff09<\/li>\n\n\n\n<li>\u9694\u79bb\u6027\uff08\u5728\u4e8b\u52a1\u5f00\u59cb\u548c\u7ed3\u675f\u4e4b\u95f4\uff0c\u9884\u9632\u591a\u4e2a\u5e76\u53d1\u4e8b\u52a1\u540c\u65f6\u5bf9\u6570\u636e\u5e93\u7684\u589e\u6539\u67e5\u8fd9\u4e9b\u64cd\u4f5c\u5bfc\u81f4\u7684\u6570\u636e\u4e0d\u4e00\u81f4\u4e86\uff09<\/li>\n\n\n\n<li>\u6301\u4e45\u6027\uff08\u4e8b\u52a1\u5b8c\u6210\u540e\uff0c\u6570\u636e\u5c06\u4f1a\u88ab\u6301\u4e45\u5316\u5230\u6570\u636e\u5e93\u4e2d\uff09<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u5e76\u53d1\u5b89\u5168\u95ee\u9898\u53ca\u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b<\/h2>\n\n\n\n<p>\u5b89\u5168\u95ee\u9898\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u810f\u8bfb\uff08\u8bfb\u4e86\u4e00\u4e2a\u56de\u6eda\u524d\u7684\u6570\u636e\uff09<\/li>\n\n\n\n<li>\u4e0d\u53ef\u91cd\u590d\u8bfb\uff08\u56e0\u4e3a\u4fee\u6539\u4e86\u6240\u4ee5\u7b2c\u4e8c\u6b21\u8bfb\u4e0d\u4e00\u81f4\uff09<\/li>\n\n\n\n<li>\u5e7b\u8bfb\uff08\u56e0\u4e3a\u63d2\u5165\u4e86\u6240\u4ee5\u7b2c\u4e8c\u6b21\u8bfb\u4e0d\u4e00\u6837\uff09<\/li>\n\n\n\n<li>\u66f4\u65b0\u4e22\u5931\uff08\u5c31\u662f\u56e0\u4e3a\u6ca1\u6709\u628a\u5e76\u53d1\u4e8b\u52a1\u9694\u79bb\u5f00\uff0c\u6211\u7684\u4fee\u6539\u56de\u6eda\u4e86\uff0c\u628a\u4e4b\u524d\u7684\u4fee\u6539\u4e5f\u56de\u6eda\u64a4\u9500\u4e86\uff09<\/li>\n<\/ul>\n\n\n\n<p>\u89e3\u51b3\u5b89\u5168\u95ee\u9898\u7684\u9694\u79bb\u7ea7\u522b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/\u9694\u79bb\u7ea7\u522b-1024x344.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"http:\/\/qqiukulele.cn\/wp-content\/uploads\/2021\/12\/\u9694\u79bb\u7ea7\u522b-1024x344.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">MVCC(\u5173\u4e8e\u8fd9\u4e2a\u8bdd\u9898\u5176\u5b9e\u6211\u90fd\u60f3\u5355\u72ec\u5f00\u5199\u4e00\u4e2a\u6587\u7ae0\u4e86?)<\/h3>\n\n\n\n<p>MVCC \u4e3b\u8981\u5e94\u7528\u5728RC\u3001RR\uff08READ COMMITTED\u548cREPEATABLE READ\uff09\u8fd9\u4e24\u4e2a\u9694\u79bb\u7ea7\u522b\uff0c\u662f\u57fa\u4e8e\u6570\u636e\u7248\u672c\u5bf9\u5e76\u53d1\u4e8b\u52a1\u7684\u63a7\u5236\u3002\u5b66\u4e60MVCC\u7684\u65f6\u5019\uff0c\u4f1a\u5b66\u4e60\u5230\u4e00\u4e2aUNDO_LOG\u7248\u672c\u94fe\uff0c\u662f\u7528\u4e8e\u56de\u6eda\u64cd\u4f5c\u7684\u3002\u8fd8\u6709\u4e00\u4e2aReadView\uff0c\u5c31\u662f\u201c\u5feb\u7167\u8bfb\u201d\u7684\u751f\u6210\u7269\uff0c\u662fSQL\u6267\u884c\u65f6MVCC\u63d0\u53d6\u6570\u636e\u7684\u4f9d\u636e\u3002<\/p>\n\n\n\n<p>\u5feb\u7167\u8bfb\u5c31\u662f\u6700\u666e\u901a\u7684\u4e0d\u52a0\u9501\u7684\u67e5\u8be2SQL\u8bed\u53e5\uff0c\u5b83\u5728\u5f88\u591a\u60c5\u51b5\u4e0b\uff0c\u907f\u514d\u4e86\u52a0\u9501\u64cd\u4f5c\uff0c\u964d\u4f4e\u4e86\u5f00\u9500\uff1b\u65e2\u7136\u662f\u57fa\u4e8e\u591a\u7248\u672c\uff0c\u5373\u5feb\u7167\u8bfb\u53ef\u80fd\u8bfb\u5230\u7684\u5e76\u4e0d\u4e00\u5b9a\u662f\u6570\u636e\u7684\u6700\u65b0\u7248\u672c\uff0c\u800c\u6709\u53ef\u80fd\u662f\u4e4b\u524d\u7684\u5386\u53f2\u7248\u672c\u3002ReadView\u5f53\u524d\u8bfb\u5c31\u662f\u4e00\u4e2a\u6570\u636e\u7ed3\u6784\uff0c\u4f1a\u6839\u636eReadView\u91cc\u5b58\u50a8\u7684\u7248\u672c\u53f7\u4fe1\u606f\u53bb\u7248\u672c\u94fe\u91cc\u8fd4\u56de\u6570\u636e\uff0c\u56e0\u4e3a\u5c31\u662f\u901a\u8fc7ReadView\u91cc\u53ef\u4ee5\u5224\u65ad\u8fd9\u4e2a\u4e8b\u52a1\u662f\u4e0d\u662f\u81ea\u5df1\u4fee\u6539\u7684\u54d2\uff1f\u662f\u4e0d\u662f\u5df2\u7ecf\u63d0\u4ea4\u7684\u8fd8\u662f\u6ca1\u6709\u63d0\u4ea4\u54d2\uff1f\u6216\u8005\u8fd9\u4e2a\u4e8b\u52a1\u662fReadView\u4e4b\u540e\u5f00\u542f\u54d2\uff1f<\/p>\n\n\n\n<p>\u800c\u6267\u884cinsert\u3001update\u3001select&#8230;for update\u5c31\u662f\u5f53\u524d\u8bfb\uff0c\u5f53\u524d\u8bfb\u5c31\u662f\u5b83\u8bfb\u53d6\u7684\u4e00\u5b9a\u662f\u8bb0\u5f55\u7684\u6700\u65b0\u7248\u672c\uff0c\u8bfb\u53d6\u65f6\u8fd8\u8981\u4fdd\u8bc1\u5176\u4ed6\u5e76\u53d1\u4e8b\u52a1\u4e0d\u80fd\u4fee\u6539\u5f53\u524d\u8bb0\u5f55\uff0c\u6240\u4ee5\u4f1a\u5bf9\u8bfb\u53d6\u7684\u8bb0\u5f55\u8fdb\u884c\u52a0\u9501\u7684\u64cd\u4f5c\u3002<\/p>\n\n\n\n<p>\u5f53\u524d\u8bfb\u662f\u901a\u8fc7 next-key \u9501(\u884c\u8bb0\u5f55\u9501+\u95f4\u9699\u9501)\u6765\u662f\u5b9e\u73b0\u7684\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>\u8fd9\u91cc\u8865\u5145\u4e0b\u884c\u9501\u7684 3 \u79cd\u7b97\u6cd5\uff1a<\/strong><\/p>\n\n\n\n<p>\u884c\u9501\uff08Record Lock\uff09\uff1a\u9501\u76f4\u63a5\u52a0\u5728\u7d22\u5f15\u8bb0\u5f55\u4e0a\u9762\u3002<\/p>\n\n\n\n<p>\u95f4\u9699\u9501\uff08Gap Lock\uff09\uff1a\u662f Innodb \u4e3a\u4e86\u89e3\u51b3\u5e7b\u8bfb\u95ee\u9898\u65f6\u5f15\u5165\u7684\u9501\u673a\u5236\uff0c\u6240\u4ee5\u53ea\u6709\u5728 Read Repeatable \u3001Serializable \u9694\u79bb\u7ea7\u522b\u624d\u6709\u3002<\/p>\n\n\n\n<p>Next-Key Lock \uff1aRecord Lock + Gap Lock\uff0c\u9501\u5b9a\u4e00\u4e2a\u8303\u56f4\u5e76\u4e14\u9501\u5b9a\u8bb0\u5f55\u672c\u8eab \u3002<\/p>\n<\/blockquote>\n\n\n\n<p>\u8bfb\u5df2\u63d0\u4ea4RC\u4f1a\u5728\u6bcf\u4e00\u6b21\u5feb\u7167\u8bfb\u7684\u65f6\u5019\u90fd\u6267\u884c\u5feb\u7167\u8bfb\uff0c\u6240\u4ee5\u53ef\u4ee5\u9632\u6b62\u810f\u8bfb\uff0c\u4e0d\u4f1a\u8bfb\u5230\u56de\u6eda\u524d\u7684\u4e8b\u52a1\u3002\u53ef\u91cd\u590d\u8bfbRR\u4ec5\u5728\u7b2c\u4e00\u6b21\u6267\u884c\u5feb\u7167\u8bfb\u65f6\u751f\u6210ReadView\uff0c\u540e\u7eed\u4f1a\u4e00\u76f4\u590d\u7528\u8fd9\u4e00\u6b21ReadView\uff0c\u6240\u4ee5\u53ef\u9632\u6b62\u4e0d\u53ef\u91cd\u590d\u8bfb\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5177\u4f53\u7684\u64cd\u4f5c\u7406\u89e3\uff1a<\/h3>\n\n\n\n<p>READ COMMITTED\u8bfb\u53d6\u6700\u65b0\u7684\u7248\u672c\u53f7\u8bb0\u5f55\uff0c\u5c31\u662f\u6240\u6709\u4e8b\u52a1\u6700\u65b0\u63d0\u4ea4\u7684\u7ed3\u679c\u3002<\/p>\n\n\n\n<p>REPEATABLE READ\u8bfb\u53d6\u4e4b\u524d\u7cfb\u7edf\u7248\u672c\u53f7\u7684\u8bb0\u5f55\uff0c\u4fdd\u8bc1\u540c\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u591a\u6b21\u8bfb\u53d6\u7ed3\u679c\u4e00\u81f4\u3002REPEATABLE READ\u9694\u79bb\u7ea7\u522b\u4e0b\uff0cMVCC\u5177\u4f53\u64cd\u4f5c\uff1a<\/p>\n\n\n\n<p>SELECT\u64cd\u4f5c\uff0cInnoDB\u4f1a\u6839\u636e\u4ee5\u4e0b\u4e24\u4e2a\u6761\u4ef6\u68c0\u67e5\u6bcf\u884c\u8bb0\u5f55\uff1a<\/p>\n\n\n\n<p>a. InnoDB\u53ea\u67e5\u627e\u521b\u5efa\u7248\u672c\u53f7\u65e9\u4e8e\u6216\u7b49\u4e8e\u5f53\u524d\u7cfb\u7edf\u7248\u672c\u53f7\u7684\u6570\u636e\u884c\uff0c\u8fd9\u6837\u53ef\u4ee5\u786e\u4fdd\u4e8b\u52a1\u8bfb\u53d6\u7684\u884c\uff0c\u8981\u4e48\u662f\u5728\u4e8b\u52a1\u5f00\u59cb\u524d\u5df2\u7ecf\u5b58\u5728\u7684\uff0c\u8981\u4e48\u662f\u4e8b\u52a1\u81ea\u8eab\u63d2\u5165\u6216\u8005\u4fee\u6539\u8fc7\u7684\u3002<\/p>\n\n\n\n<p>b. \u884c\u7684\u5220\u9664\u7248\u672c\u53f7\u8981\u4e48\u672a\u5b9a\u4e49\uff0c\u8981\u4e48\u5927\u4e8e\u5f53\u524d\u7684\u7cfb\u7edf\u7248\u672c\u53f7(\u5728\u5f53\u524d\u4e8b\u52a1\u5f00\u59cb\u4e4b\u540e\u5220\u9664\u7684)\u3002\u8fd9\u53ef\u4ee5\u786e\u4fdd\u4e8b\u52a1\u8bfb\u53d6\u5230\u7684\u884c\uff0c\u5728\u4e8b\u52a1\u5f00\u59cb\u4e4b\u524d\u672a\u88ab\u5220\u9664\u3002<\/p>\n\n\n\n<p>\u5176\u4ed6\u4e24\u4e2a\u9694\u79bb\u7ea7\u522b\u548cMVCC\u4e0d\u517c\u5bb9\u3002READ UNCOMMITTED\u603b\u662f\u8bfb\u53d6\u6700\u65b0\u7684\u6570\u636e\u884c\uff0c\u800c\u4e0d\u662f\u7b26\u5408\u5f53\u524d\u4e8b\u52a1\u7248\u672c\u7684\u6570\u636e\u884c\u3002SERIALIZABLE\u4f1a\u5bf9\u6240\u6709\u8bfb\u53d6\u7684\u884c\u90fd\u52a0\u9501\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">redo log<\/h3>\n\n\n\n<p>redo log \u548cundo log\u76f8\u5bf9\u5e94\uff0c\u5b83\u662f\u5c06\u4e8b\u52a1\u64cd\u4f5c\u7684\u6700\u65b0\u6570\u636e\u5b58\u50a8\u8d77\u6765\u3002<\/p>\n\n\n\n<p>redo log\u4e3b\u8981\u662f\u4e3a\u4e86\u5b9e\u73b0\u4e8b\u52a1\u7684\u6301\u4e45\u6027\u800c\u4ea7\u751f\u7684\u3002\u9632\u6b62\u5728\u53d1\u751f\u6545\u969c\u7684\u65f6\u95f4\u70b9\uff0c\u5c1a\u6709\u810f\u9875\u672a\u5199\u5165\u78c1\u76d8\uff0c\u5728\u91cd\u542fmysql\u670d\u52a1\u7684\u65f6\u5019\uff0c\u6839\u636eredo log\u8fdb\u884c\u91cd\u505a\uff0c\u4ece\u800c\u8fbe\u5230\u4e8b\u52a1\u7684\u672a\u5165\u78c1\u76d8\u6570\u636e\u8fdb\u884c\u6301\u4e45\u5316\u8fd9\u4e00\u7279\u6027\u3002<\/p>\n\n\n\n<p>MySQL InnoDB\u662f\u4f7f\u7528undo log\u5b9e\u73b0\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236(MVCC)\u3002\u4e8b\u52a1\u672a\u63d0\u4ea4\u4e4b\u524d\uff0cundo log\u4fdd\u5b58\u672a\u63d0\u4ea4\u6570\u636e\u4e4b\u524d\u7684\u6570\u636e\u7248\u672c\uff0c\u5f53\u8bfb\u53d6\u67d0\u4e00\u884c\u88ab\u5176\u4ed6\u4e8b\u52a1\u64cd\u4f5c\u65f6\uff0c\u53ef\u4ee5\u4eceundo log\u4e2d\u5206\u6790\u51fa\u8be5\u884c\u4e4b\u524d\u8bb0\u5f55\u7684\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u8fd8\u6709\u5c31\u662f\u5728\u6267\u884c\u4e8b\u52a1\u7684\u65f6\u5019\uff0c\u6211\u4eec\u77e5\u9053\u5f53\u8c03\u7528roll back\u547d\u4ee4\u7684\u65f6\u5019\uff0c\u6570\u636e\u5c31\u4f1a\u8fd8\u539f\uff0c\u8fd9\u91cc\u7528\u5230\u7684\u539f\u7406\u5c31\u662fundo,\u4e5f\u662f\u5b9e\u73b0\u4e8b\u52a1\u539f\u5b50\u6027\u7684\u539f\u7406\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u6570\u636e\u5e93\u4e09\u5927\u8303\u5f0f\uff08\u4e0d\u77e5\u4e3a\u5565\u5c31\u60f3\u52a0\u8fdb\u6765\u4e86\uff09<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6240\u6709\u5b57\u6bb5\u503c\u90fd\u662f\u4e0d\u53ef\u5206\u89e3\u7684\u539f\u5b50\u503c\u3002<\/li>\n\n\n\n<li>\u5728\u4e00\u4e2a\u6570\u636e\u5e93\u8868\u4e2d\uff0c\u4e00\u4e2a\u8868\u4e2d\u53ea\u80fd\u4fdd\u5b58\u4e00\u79cd\u6570\u636e\uff0c\u4e0d\u53ef\u4ee5\u628a\u591a\u79cd\u6570\u636e\u4fdd\u5b58\u5728\u540c\u4e00\u5f20\u6570\u636e\u5e93\u8868\u4e2d\u3002<\/li>\n\n\n\n<li>\u6570\u636e\u8868\u4e2d\u7684\u6bcf\u4e00\u5217\u6570\u636e\u90fd\u548c\u4e3b\u952e\u76f4\u63a5\u76f8\u5173\uff0c\u800c\u4e0d\u80fd\u95f4\u63a5\u76f8\u5173\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e00\u8303\u5f0f(\u786e\u4fdd\u6bcf\u5217\u4fdd\u6301\u539f\u5b50\u6027)<\/h3>\n\n\n\n<p>\u7b2c\u4e00\u8303\u5f0f\u662f\u6700\u57fa\u672c\u7684\u8303\u5f0f\u3002\u5982\u679c\u6570\u636e\u5e93\u8868\u4e2d\u7684\u6240\u6709\u5b57\u6bb5\u503c\u90fd\u662f\u4e0d\u53ef\u5206\u89e3\u7684\u539f\u5b50\u503c\uff0c\u5c31\u8bf4\u660e\u8be5\u6570\u636e\u5e93\u8868\u6ee1\u8db3\u4e86\u7b2c\u4e00\u8303\u5f0f\u3002<\/p>\n\n\n\n<p>\u7b2c\u4e00\u8303\u5f0f\u7684\u5408\u7406\u9075\u5faa\u9700\u8981\u6839\u636e\u7cfb\u7edf\u7684\u5b9e\u9645\u9700\u6c42\u6765\u5b9a\u3002\u6bd4\u5982\u67d0\u4e9b\u6570\u636e\u5e93\u7cfb\u7edf\u4e2d\u9700\u8981\u7528\u5230\u201c\u5730\u5740\u201d\u8fd9\u4e2a\u5c5e\u6027\uff0c\u672c\u6765\u76f4\u63a5\u5c06\u201c\u5730\u5740\u201d\u5c5e\u6027\u8bbe\u8ba1\u6210\u4e00\u4e2a\u6570\u636e\u5e93\u8868\u7684\u5b57\u6bb5\u5c31\u884c\u3002\u4f46\u662f\u5982\u679c\u7cfb\u7edf\u7ecf\u5e38\u4f1a\u8bbf\u95ee\u201c\u5730\u5740\u201d\u5c5e\u6027\u4e2d\u7684\u201c\u57ce\u5e02\u201d\u90e8\u5206\uff0c\u90a3\u4e48\u5c31\u975e\u8981\u5c06\u201c\u5730\u5740\u201d\u8fd9\u4e2a\u5c5e\u6027\u91cd\u65b0\u62c6\u5206\u4e3a\u7701\u4efd\u3001\u57ce\u5e02\u3001\u8be6\u7ec6\u5730\u5740\u7b49\u591a\u4e2a\u90e8\u5206\u8fdb\u884c\u5b58\u50a8\uff0c\u8fd9\u6837\u5728\u5bf9\u5730\u5740\u4e2d\u67d0\u4e00\u90e8\u5206\u64cd\u4f5c\u7684\u65f6\u5019\u5c06\u975e\u5e38\u65b9\u4fbf\u3002\u8fd9\u6837\u8bbe\u8ba1\u624d\u7b97\u6ee1\u8db3\u4e86\u6570\u636e\u5e93\u7684\u7b2c\u4e00\u8303\u5f0f\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e8c\u8303\u5f0f(\u786e\u4fdd\u8868\u4e2d\u7684\u6bcf\u5217\u90fd\u548c\u4e3b\u952e\u76f8\u5173)<\/h3>\n\n\n\n<p>\u7b2c\u4e8c\u8303\u5f0f\u5728\u7b2c\u4e00\u8303\u5f0f\u7684\u57fa\u7840\u4e4b\u4e0a\u66f4\u8fdb\u4e00\u5c42\u3002\u7b2c\u4e8c\u8303\u5f0f\u9700\u8981\u786e\u4fdd\u6570\u636e\u5e93\u8868\u4e2d\u7684\u6bcf\u4e00\u5217\u90fd\u548c\u4e3b\u952e\u76f8\u5173\uff0c\u800c\u4e0d\u80fd\u53ea\u4e0e\u4e3b\u952e\u7684\u67d0\u4e00\u90e8\u5206\u76f8\u5173\uff08\u4e3b\u8981\u9488\u5bf9\u8054\u5408\u4e3b\u952e\u800c\u8a00\uff09\u3002\u4e5f\u5c31\u662f\u8bf4 \u5728\u4e00\u4e2a\u6570\u636e\u5e93\u8868\u4e2d\uff0c\u4e00\u4e2a\u8868\u4e2d\u53ea\u80fd\u4fdd\u5b58\u4e00\u79cd\u6570\u636e\uff0c\u4e0d\u53ef\u4ee5\u628a\u591a\u79cd\u6570\u636e\u4fdd\u5b58\u5728\u540c\u4e00\u5f20\u6570\u636e\u5e93\u8868\u4e2d\u3002<\/p>\n\n\n\n<p>\u6bd4\u5982\u8981\u8bbe\u8ba1\u4e00\u4e2a\u8ba2\u5355\u4fe1\u606f\u8868\uff0c\u56e0\u4e3a\u8ba2\u5355\u4e2d\u53ef\u80fd\u4f1a\u6709\u591a\u79cd\u5546\u54c1\uff0c\u6240\u4ee5\u8981\u5c06\u8ba2\u5355\u7f16\u53f7\u548c\u5546\u54c1\u7f16\u53f7\u4f5c\u4e3a\u6570\u636e\u5e93\u8868\u7684\u8054\u5408\u4e3b\u952e\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7b2c\u4e09\u8303\u5f0f(\u786e\u4fdd\u6bcf\u5217\u90fd\u548c\u4e3b\u952e\u5217\u76f4\u63a5\u76f8\u5173,\u800c\u4e0d\u662f\u95f4\u63a5\u76f8\u5173)<\/h3>\n\n\n\n<p>\u7b2c\u4e09\u8303\u5f0f\u9700\u8981\u786e\u4fdd\u6570\u636e\u8868\u4e2d\u7684\u6bcf\u4e00\u5217\u6570\u636e\u90fd\u548c\u4e3b\u952e\u76f4\u63a5\u76f8\u5173\uff0c\u800c\u4e0d\u80fd\u95f4\u63a5\u76f8\u5173\u3002<\/p>\n\n\n\n<p>\u6bd4\u5982\u5728\u8bbe\u8ba1\u4e00\u4e2a\u8ba2\u5355\u6570\u636e\u8868\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u5c06\u5ba2\u6237\u7f16\u53f7\u4f5c\u4e3a\u4e00\u4e2a\u5916\u952e\u548c\u8ba2\u5355\u8868\u5efa\u7acb\u76f8\u5e94\u7684\u5173\u7cfb\u3002\u800c\u4e0d\u53ef\u4ee5\u5728\u8ba2\u5355\u8868\u4e2d\u6dfb\u52a0\u5173\u4e8e\u5ba2\u6237\u5176\u5b83\u4fe1\u606f\uff08\u6bd4\u5982\u59d3\u540d\u3001\u6240\u5c5e\u516c\u53f8\u7b49\uff09\u7684\u5b57\u6bb5\u3002<\/p>\n\n\n\n<p>\u4f18\u70b9\uff1a\u53ef\u4ee5\u5c3d\u91cf\u5f97\u51cf\u5c11\u6570\u636e\u5197\u4f59 \u7f3a\u70b9:\u5bf9\u4e8e\u67e5\u8be2\u9700\u8981\u591a\u4e2a\u8868\u8fdb\u884c\u5173\u8054\uff0c\u66f4\u96be\u8fdb\u884c\u7d22\u5f15\u4f18\u5316<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>\u53c2\u8003\u6587\u7ae0\uff1a<\/p>\n\n\n\n<p>\u2460<a href=\"https:\/\/programmerall.com\/article\/80402052477\/\"> \u300aWhy is MySQL index use B+ Tree?\u300b<\/a><\/p>\n\n\n\n<p>\u2461<a href=\"https:\/\/mp.weixin.qq.com\/s\/gWOnQ2s--SEmRPxUhhh0ww\"> 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