{"id":125,"date":"2024-10-22T17:01:41","date_gmt":"2024-10-22T09:01:41","guid":{"rendered":"https:\/\/blog.easitch.com\/?p=125"},"modified":"2026-03-18T14:25:00","modified_gmt":"2026-03-18T06:25:00","slug":"%e8%ae%b0%e4%b8%80%e6%ac%a1%e6%9d%ad%e5%b7%9e%e7%99%be%e4%b8%96%e5%bf%ab%e9%80%92%e9%9d%a2%e8%af%95%e9%a2%98%ef%bc%88%e6%b5%b7%e5%a4%96erp%ef%bc%89","status":"publish","type":"post","link":"https:\/\/blog.eastfond.com\/?p=125","title":{"rendered":"\u8bb0\u4e00\u6b21\u676d\u5dde\u767e\u4e16\u5feb\u9012\u9762\u8bd5\u9898\uff08\u6d77\u5916ERP\uff09"},"content":{"rendered":"<blockquote>\n<p>\u5168\u7a0b\u6ca1\u95ee\u8fc7\u5f88\u591aJava\u4e0a\u7684\u4e1c\u897f\uff0c\u90fd\u662fMySQL\u4e0a\u7684\u3002\ud83d\ude14<\/p>\n<\/blockquote>\n<h1>B\u6811\u548cB+\u6811<\/h1>\n<h2>B\u6811<\/h2>\n<p>B 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src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/image.eastfond.com\/file\/1740497868867_202502252337838.webp\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" 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src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/image.eastfond.com\/file\/1740497926415_202502252338948.webp\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p>\u800c B \u6811\u662f\u4e00\u79cd\u591a\u8def\u5e73\u8861\u67e5\u627e\u6811\uff0c\u5b83\u6ee1\u8db3\u5e73\u8861\u4e8c\u53c9\u6811\u7684\u89c4\u5219\uff0c\u4f46\u662f\u5b83\u53ef\u4ee5\u6709\u591a\u4e2a\u5b50\u6811\uff0c\u5b50\u6811\u7684\u6570\u91cf\u53d6\u51b3\u4e8e\u5173\u952e\u5b57\u7684\u6570\u91cf\uff0c\u6bd4\u5982\u4e0b\u56fe\u4e2d\u6839\u8282\u70b9\u6709\u4e24\u4e2a\u5173\u952e\u5b57 3 \u548c 5\uff0c\u90a3\u4e48\u5b83\u80fd\u591f\u62e5\u6709\u7684<code>\u5b50\u8def\u6570\u91cf=\u5173\u952e\u5b57\u6570+1<\/code>\u3002<\/p>\n<p>\u56e0\u6b64\u4ece\u8fd9\u4e2a\u7279\u5f81\u6765\u770b\uff0c\u5728\u5b58\u50a8\u540c\u6837\u6570\u636e\u91cf\u7684\u60c5\u51b5\u4e0b\uff0c\u5e73\u8861\u4e8c\u53c9\u6811\u7684\u9ad8\u5ea6\u8981\u5927\u4e8e B \u6811\u3002<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/image.eastfond.com\/file\/1740497947391_202502252338456.webp'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/image.eastfond.com\/file\/1740497947391_202502252338456.webp\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<h2>B+\u6811<\/h2>\n<p>B+\u6811\uff0c\u5176\u5b9e\u662f\u5728 B \u6811\u7684\u57fa\u7840\u4e0a\u505a\u7684\u589e\u5f3a\uff0c\u6700\u5927\u7684\u533a\u522b\u6709\u4e24\u4e2a\uff1a<\/p>\n<ol>\n<li>\n<p>B \u6811\u7684\u6570\u636e\u5b58\u50a8\u5728\u6bcf\u4e2a\u8282\u70b9\u4e0a\uff0c\u800c B+\u6811\u4e2d\u7684\u6570\u636e\u662f\u5b58\u50a8\u5728\u53f6\u5b50\u8282\u70b9\uff0c\u5e76\u4e14\u901a\u8fc7\u94fe\u8868\u7684\u65b9\u5f0f\u628a\u53f6\u5b50\u8282\u70b9\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u8fde\u63a5\u3002<\/p>\n<\/li>\n<li>\n<p>B+\u6811\u7684\u5b50\u8def\u6570\u91cf\u7b49\u4e8e\u5173\u952e\u5b57\u6570<\/p>\n<\/li>\n<\/ol>\n<p>\u8fd9\u4e2a\u662f B \u6811\u7684\u5b58\u50a8\u7ed3\u6784\uff0c\u4ece B 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lazyload-container-unload' data-fancybox='post-images' href='https:\/\/image.eastfond.com\/file\/1740498031544_202502252340962.webp'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/image.eastfond.com\/file\/1740498031544_202502252340962.webp\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p>\u5f88\u660e\u663e\uff0c<strong>\u78c1\u76d8 IO \u8fd9\u4e2a\u8fc7\u7a0b\u7684\u6027\u80fd\u5f00\u9500\u662f\u975e\u5e38\u5927\u7684<\/strong>\uff0c\u7279\u522b\u662f\u67e5\u8be2\u7684\u6570\u636e\u91cf\u6bd4\u8f83\u591a\u7684\u60c5\u51b5\u4e0b\u3002<\/p>\n<p>\u6240\u4ee5\u5728 InnoDB \u4e2d\uff0c\u5e72\u8106\u5bf9\u5b58\u50a8\u5728\u78c1\u76d8\u5757\u4e0a\u7684\u6570\u636e\u5efa\u7acb\u4e00\u4e2a\u7d22\u5f15\uff0c\u7136\u540e\u628a\u7d22\u5f15\u6570\u636e\u4ee5\u53ca\u7d22\u5f15\u5217\u5bf9\u5e94\u7684\u78c1\u76d8\u5730\u5740\uff0c\u4ee5 B+\u6811\u7684\u65b9\u5f0f\u6765\u5b58\u50a8\u3002<\/p>\n<p>\u5982\u56fe\u6240\u793a\uff0c\u5f53\u6211\u4eec\u9700\u8981\u67e5\u8be2\u76ee\u6807\u6570\u636e\u7684\u65f6\u5019\uff0c\u6839\u636e\u7d22\u5f15\u4ece B+\u6811\u4e2d\u67e5\u627e\u76ee\u6807\u6570\u636e\u5373\u53ef\uff0c\u7531\u4e8e B+\u6811\u5206\u8def\u8f83\u591a\uff0c\u6240\u4ee5\u53ea\u9700\u8981\u8f83\u5c11\u6b21\u6570\u7684\u78c1\u76d8 IO \u5c31\u80fd\u67e5\u627e\u5230\u3002<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/image.eastfond.com\/file\/1740498053385_202502252340058.webp'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/image.eastfond.com\/file\/1740498053385_202502252340058.webp\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<h2>\u4e3a\u4ec0\u4e48\u7528 B \u6811\u6216\u8005 B+\u6811\u6765\u505a\u7d22\u5f15\u7ed3\u6784\uff1f<\/h2>\n<p>\u539f\u56e0\u662f AVL \u6811\u7684\u9ad8\u5ea6\u8981\u6bd4 B \u6811\u7684\u9ad8\u5ea6\u8981\u9ad8\uff0c\u800c\u9ad8\u5ea6\u5c31\u610f\u5473\u7740\u78c1\u76d8 IO \u7684\u6570\u91cf\u3002\u6240\u4ee5\u4e3a\u4e86\u51cf\u5c11\u78c1\u76d8 IO \u7684\u6b21\u6570\uff0c\u6587\u4ef6\u7cfb\u7edf\u6216\u8005\u6570\u636e\u5e93\u624d\u4f1a\u91c7\u7528 B \u6811\u6216\u8005 B+\u6811\u3002<\/p>\n<h1>MySQL\u5982\u4f55\u9632\u6b62\u6b7b\u9501\uff0c\u5728java\u4ee3\u7801\u4e0a\u5982\u4f55\u8fdb\u884c\u89c4\u907f<\/h1>\n<h2>MySQL\u6b7b\u9501\u7684\u53d1\u751f<\/h2>\n<p><strong>\u6b7b\u9501<\/strong>\u662f\u6307\u4e24\u4e2a\u6216\u591a\u4e2a\u4e8b\u52a1\u76f8\u4e92\u7b49\u5f85\u5bf9\u65b9\u91ca\u653e\u8d44\u6e90\uff0c\u5bfc\u81f4\u6240\u6709\u4e8b\u52a1\u90fd\u65e0\u6cd5\u7ee7\u7eed\u6267\u884c\u7684\u72b6\u6001\u3002\u5728MySQL\u4e2d\uff0c\u6b7b\u9501\u901a\u5e38\u53d1\u751f\u5728\u4ee5\u4e0b\u60c5\u51b5\uff1a<\/p>\n<ol>\n<li><strong>\u4ea4\u53c9\u9501\u8bf7\u6c42<\/strong>\uff1a\u4e24\u4e2a\u4e8b\u52a1\u5206\u522b\u6301\u6709\u5bf9\u65b9\u9700\u8981\u7684\u9501\uff0c\u5e76\u4e14\u90fd\u5728\u7b49\u5f85\u5bf9\u65b9\u91ca\u653e\u9501\u3002<\/li>\n<li><strong>\u9501\u5347\u7ea7<\/strong>\uff1a\u4e00\u4e2a\u4e8b\u52a1\u4ece\u8f83\u4f4e\u7ea7\u522b\u7684\u9501\uff08\u5982\u884c\u9501\uff09\u5347\u7ea7\u5230\u8f83\u9ad8\u7ea7\u522b\u7684\u9501\uff08\u5982\u8868\u9501\uff09\uff0c\u800c\u53e6\u4e00\u4e2a\u4e8b\u52a1\u6301\u6709\u8be5\u8868\u7684\u9501\u3002<\/li>\n<li><strong>\u9501\u8d85\u65f6<\/strong>\uff1a\u4e00\u4e2a\u4e8b\u52a1\u7b49\u5f85\u9501\u7684\u65f6\u95f4\u8d85\u8fc7\u4e86\u8bbe\u5b9a\u7684\u8d85\u65f6\u65f6\u95f4\uff0c\u5bfc\u81f4\u9501\u8bf7\u6c42\u5931\u8d25\u3002<\/li>\n<\/ol>\n<div  class='collapse-block shadow-sm collapse-block-danger collapsed hide-border-left'><div class='collapse-block-title'><span class='collapse-block-title-inner'>\u6848\u4f8b<\/span><i class='collapse-icon fa fa-angle-down'><\/i><\/div><div class='collapse-block-body' style='display:none;'><\/p>\n<p>![](https:\/\/image.eastfond.com\/file\/1740498082084_202502252341465.webp)<\/p>\n<p>\u73b0\u5728\uff0c\u6211\u4eec\u6309\u65f6\u95f4\u987a\u5e8f\u6765\u5206\u6790\u4e00\u4e0b\u4e3a\u4ec0\u4e48\u662f\u8fd9\u6837\u7684\u7ed3\u679c\u3002<\/p>\n<ol>\n<li>session A \u542f\u52a8\u4e8b\u52a1\u540e\u6267\u884c\u67e5\u8be2\u8bed\u53e5\u52a0 <code>lock in share mode<\/code>\uff0c\u5728\u7d22\u5f15 c \u4e0a\u52a0\u4e86 next-key lock <code>(5,10]<\/code> \u548c\u95f4\u9699\u9501 <code>(10,15)<\/code>\uff1b<\/li>\n<li>session B \u7684 <code>update<\/code> \u8bed\u53e5\u4e5f\u8981\u5728\u7d22\u5f15 c \u4e0a\u52a0 next-key lock <code>(5,10]<\/code> \uff0c\u8fdb\u5165\u9501\u7b49\u5f85\uff1b<\/li>\n<li>\u7136\u540e session A \u8981\u518d\u63d2\u5165 <code>(8,8,8)<\/code> \u8fd9\u4e00\u884c\uff0c\u88ab session B \u7684\u95f4\u9699\u9501\u9501\u4f4f\u3002\u7531\u4e8e\u51fa\u73b0\u4e86\u6b7b\u9501\uff0cInnoDB \u8ba9 session B \u56de\u6eda\u3002<\/li>\n<\/ol>\n<p>\u4f60\u53ef\u80fd\u4f1a\u95ee\uff0csession B \u7684 next-key lock \u4e0d\u662f\u8fd8\u6ca1\u7533\u8bf7\u6210\u529f\u5417\uff1f<\/p>\n<p>\u5176\u5b9e\u662f\u8fd9\u6837\u7684\uff0csession B \u7684 \u201c\u52a0 next-key lock (5,10] \u201d \u64cd\u4f5c\uff0c\u5b9e\u9645\u4e0a\u5206\u6210\u4e86\u4e24\u6b65\uff0c\u5148\u662f\u52a0 (5,10) \u7684\u95f4\u9699\u9501\uff0c\u52a0\u9501\u6210\u529f\uff1b\u7136\u540e\u52a0 c=10 \u7684\u884c\u9501\uff0c\u8fd9\u65f6\u5019\u624d\u88ab\u9501\u4f4f\u7684\u3002<\/p>\n<p><\/div><\/div>\n<h2>\u5982\u4f55\u9632\u6b62\u6b7b\u9501<\/h2>\n<ol>\n<li>\n<p><strong>\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b<\/strong>\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528\u8f83\u4f4e\u7684\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\uff08\u5982<code>READ COMMITTED<\/code>\uff09\u53ef\u4ee5\u51cf\u5c11\u9501\u7684\u6301\u6709\u65f6\u95f4\uff0c\u4ece\u800c\u964d\u4f4e\u6b7b\u9501\u7684\u53ef\u80fd\u6027\u3002<\/li>\n<li>\u4f46\u8981\u6ce8\u610f\uff0c\u8f83\u4f4e\u7684\u9694\u79bb\u7ea7\u522b\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6570\u636e\u4e00\u81f4\u6027\u95ee\u9898\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u4e8b\u52a1\u987a\u5e8f<\/strong>\uff1a<\/p>\n<ul>\n<li>\u786e\u4fdd\u6240\u6709\u4e8b\u52a1\u4ee5\u76f8\u540c\u7684\u987a\u5e8f\u8bbf\u95ee\u8d44\u6e90\u3002\u4f8b\u5982\uff0c\u5982\u679c\u591a\u4e2a\u4e8b\u52a1\u90fd\u9700\u8981\u9501\u5b9a\u8868A\u548c\u8868B\uff0c\u90a3\u4e48\u6240\u6709\u4e8b\u52a1\u90fd\u5e94\u8be5\u5148\u9501\u5b9a\u8868A\uff0c\u518d\u9501\u5b9a\u8868B\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u4e8b\u52a1\u8d85\u65f6<\/strong>\uff1a<\/p>\n<ul>\n<li>\u8bbe\u7f6e\u4e8b\u52a1\u7684\u8d85\u65f6\u65f6\u95f4\uff0c\u5982\u679c\u4e8b\u52a1\u7b49\u5f85\u9501\u7684\u65f6\u95f4\u8d85\u8fc7\u4e86\u8d85\u65f6\u65f6\u95f4\uff0c\u5219\u81ea\u52a8\u56de\u6eda\u4e8b\u52a1\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u9501\u7c92\u5ea6<\/strong>\uff1a<\/p>\n<ul>\n<li>\u5c3d\u91cf\u4f7f\u7528\u8f83\u5c0f\u7684\u9501\u7c92\u5ea6\uff08\u5982\u884c\u9501\uff09\uff0c\u800c\u4e0d\u662f\u8f83\u5927\u7684\u9501\u7c92\u5ea6\uff08\u5982\u8868\u9501\uff09\uff0c\u4ee5\u51cf\u5c11\u9501\u51b2\u7a81\u7684\u53ef\u80fd\u6027\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u907f\u514d\u957f\u4e8b\u52a1<\/strong>\uff1a<\/p>\n<ul>\n<li>\u5c3d\u91cf\u7f29\u77ed\u4e8b\u52a1\u7684\u6267\u884c\u65f6\u95f4\uff0c\u51cf\u5c11\u9501\u7684\u6301\u6709\u65f6\u95f4\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h2>\u5728Java\u4ee3\u7801\u4e0a\u5982\u4f55\u8fdb\u884c\u89c4\u907f<\/h2>\n<ol>\n<li>\n<p><strong>\u4e8b\u52a1\u7ba1\u7406<\/strong>\uff1a<\/p>\n<ul>\n<li>\n<p>\u4f7f\u7528Spring\u6846\u67b6\u7684\u4e8b\u52a1\u7ba1\u7406\u529f\u80fd\uff0c\u786e\u4fdd\u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b\u3001\u4f20\u64ad\u884c\u4e3a\u548c\u8d85\u65f6\u65f6\u95f4\u8bbe\u7f6e\u5408\u7406\u3002<\/p>\n<\/li>\n<li>\n<p>\u4f8b\u5982\uff0c\u4f7f\u7528<code>@Transactional<\/code>\u6ce8\u89e3\u6765\u7ba1\u7406\u4e8b\u52a1\uff1a<\/p>\n<pre><code class=\"language-java\">@Transactional(isolation = Isolation.READ_COMMITTED, timeout = 30)\npublic void performTransaction() {\n \/\/ \u4e8b\u52a1\u903b\u8f91\n}<\/code><\/pre>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u8d44\u6e90\u987a\u5e8f<\/strong>\uff1a<\/p>\n<ul>\n<li>\u5728\u4ee3\u7801\u4e2d\u786e\u4fdd\u6240\u6709\u4e8b\u52a1\u4ee5\u76f8\u540c\u7684\u987a\u5e8f\u8bbf\u95ee\u6570\u636e\u5e93\u8d44\u6e90\u3002\u4f8b\u5982\uff0c\u5982\u679c\u591a\u4e2a\u4e8b\u52a1\u90fd\u9700\u8981\u66f4\u65b0\u8868A\u548c\u8868B\uff0c\u786e\u4fdd\u6240\u6709\u4e8b\u52a1\u90fd\u5148\u66f4\u65b0\u8868A\uff0c\u518d\u66f4\u65b0\u8868B\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u9501\u8d85\u65f6\u5904\u7406<\/strong>\uff1a<\/p>\n<ul>\n<li>\n<p>\u5728\u4ee3\u7801\u4e2d\u6355\u83b7\u9501\u8d85\u65f6\u5f02\u5e38\uff08\u5982<code>LockTimeoutException<\/code>\uff09\uff0c\u5e76\u8fdb\u884c\u76f8\u5e94\u7684\u5904\u7406\uff0c\u4f8b\u5982\u56de\u6eda\u4e8b\u52a1\u6216\u91cd\u8bd5\u3002<\/p>\n<\/li>\n<li>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-java\">try {\n performTransaction();\n} catch (LockTimeoutException e) {\n \/\/ \u5904\u7406\u9501\u8d85\u65f6\u5f02\u5e38\n TransactionAspectSupport.currentTransactionStatus().setRollbackOnly();\n}<\/code><\/pre>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u91cd\u8bd5\u673a\u5236<\/strong>\uff1a<\/p>\n<ul>\n<li>\n<p>\u5bf9\u4e8e\u53ef\u80fd\u53d1\u751f\u6b7b\u9501\u7684\u573a\u666f\uff0c\u53ef\u4ee5\u5b9e\u73b0\u91cd\u8bd5\u673a\u5236\u3002\u5982\u679c\u68c0\u6d4b\u5230\u6b7b\u9501\uff0c\u53ef\u4ee5\u7b49\u5f85\u4e00\u6bb5\u65f6\u95f4\u540e\u91cd\u8bd5\u4e8b\u52a1\u3002<\/p>\n<\/li>\n<li>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-java\">int retryCount = 3;\nfor (int i = 0; i < retryCount; i++) {\n try {\n     performTransaction();\n     break;\n } catch (DeadlockException e) {\n     if (i == retryCount - 1) {\n         throw e;\n     }\n     Thread.sleep(1000); \/\/ \u7b49\u5f851\u79d2\u540e\u91cd\u8bd5\n }\n}<\/code><\/pre>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u76d1\u63a7\u548c\u65e5\u5fd7<\/strong>\uff1a<\/p>\n<ul>\n<li>\u76d1\u63a7\u6570\u636e\u5e93\u7684\u6b7b\u9501\u60c5\u51b5\uff0c\u5e76\u8bb0\u5f55\u6b7b\u9501\u65e5\u5fd7\u3002\u901a\u8fc7\u5206\u6790\u65e5\u5fd7\uff0c\u53ef\u4ee5\u627e\u51fa\u6b7b\u9501\u7684\u6839\u672c\u539f\u56e0\uff0c\u5e76\u8fdb\u884c\u4f18\u5316\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h2>\u81ea\u8eab\u4f18\u5316<\/h2>\n<p>\u5728MySQL\u7684Server\u5f15\u64ce\u4e2d\uff0c\u4e3a\u4e86\u9632\u6b62\u6b7b\u9501\uff0c\u505a\u4e86\u4ee5\u4e0b\u51e0\u65b9\u9762\u7684\u8bbe\u8ba1\u548c\u4f18\u5316\uff1a<\/p>\n<h3>1. <strong>\u6b7b\u9501\u68c0\u6d4b<\/strong><\/h3>\n<p>MySQL\u5185\u7f6e\u4e86\u6b7b\u9501\u68c0\u6d4b\u673a\u5236\uff0c\u901a\u8fc7\u5b9a\u671f\u68c0\u67e5\u4e8b\u52a1\u4e4b\u95f4\u7684\u4f9d\u8d56\u5173\u7cfb\u6765\u8bc6\u522b\u6b7b\u9501\u3002\u5f53\u68c0\u6d4b\u5230\u6b7b\u9501\u65f6\uff0cMySQL\u4f1a\u9009\u62e9\u4e00\u4e2a\u4e8b\u52a1\u4f5c\u4e3a\u201c\u727a\u7272\u54c1\u201d\uff0c\u5e76\u56de\u6eda\u8be5\u4e8b\u52a1\uff0c\u4ece\u800c\u6253\u7834\u6b7b\u9501\u72b6\u6001\u3002<\/p>\n<ul>\n<li><strong>\u6b7b\u9501\u68c0\u6d4b\u7b97\u6cd5<\/strong>\uff1aMySQL\u4f7f\u7528\u4e86\u4e00\u79cd\u79f0\u4e3a\u201c\u7b49\u5f85\u56fe\u201d\uff08Wait-For Graph\uff09\u7684\u7b97\u6cd5\u6765\u68c0\u6d4b\u6b7b\u9501\u3002\u7b49\u5f85\u56fe\u662f\u4e00\u4e2a\u6709\u5411\u56fe\uff0c\u5176\u4e2d\u8282\u70b9\u8868\u793a\u4e8b\u52a1\uff0c\u8fb9\u8868\u793a\u4e8b\u52a1\u4e4b\u95f4\u7684\u7b49\u5f85\u5173\u7cfb\u3002\u5982\u679c\u56fe\u4e2d\u5b58\u5728\u73af\u8def\uff0c\u5219\u8868\u793a\u53d1\u751f\u4e86\u6b7b\u9501\u3002<\/li>\n<\/ul>\n<h3>2. <strong>\u81ea\u52a8\u56de\u6eda<\/strong><\/h3>\n<p>\u5f53\u6b7b\u9501\u88ab\u68c0\u6d4b\u5230\u65f6\uff0cMySQL\u4f1a\u81ea\u52a8\u9009\u62e9\u4e00\u4e2a\u4e8b\u52a1\u8fdb\u884c\u56de\u6eda\uff0c\u901a\u5e38\u662f\u9009\u62e9\u4ee3\u4ef7\u6700\u5c0f\u7684\u4e8b\u52a1\uff08\u5373\u56de\u6eda\u8be5\u4e8b\u52a1\u6240\u9700\u7684\u5de5\u4f5c\u91cf\u6700\u5c0f\uff09\u3002\u88ab\u56de\u6eda\u7684\u4e8b\u52a1\u4f1a\u6536\u5230\u4e00\u4e2a<code>ER_LOCK_DEADLOCK<\/code>\u9519\u8bef\u3002<\/p>\n<ul>\n<li><strong>\u56de\u6eda\u7b56\u7565<\/strong>\uff1aMySQL\u4f1a\u9009\u62e9\u4e00\u4e2a\u4e8b\u52a1\u8fdb\u884c\u56de\u6eda\uff0c\u800c\u4e0d\u662f\u7b80\u5355\u5730\u7ec8\u6b62\u6240\u6709\u4e8b\u52a1\u3002\u8fd9\u6837\u53ef\u4ee5\u6700\u5c0f\u5316\u5bf9\u7cfb\u7edf\u7684\u5f71\u54cd\u3002<\/li>\n<\/ul>\n<h3>3. <strong>\u9501\u8d85\u65f6<\/strong><\/h3>\n<p>MySQL\u5141\u8bb8\u4e3a\u9501\u8bf7\u6c42\u8bbe\u7f6e\u8d85\u65f6\u65f6\u95f4\u3002\u5982\u679c\u4e00\u4e2a\u4e8b\u52a1\u5728\u7b49\u5f85\u9501\u7684\u65f6\u95f4\u8d85\u8fc7\u4e86\u8bbe\u5b9a\u7684\u8d85\u65f6\u65f6\u95f4\uff0cMySQL\u4f1a\u81ea\u52a8\u653e\u5f03\u8be5\u9501\u8bf7\u6c42\uff0c\u5e76\u56de\u6eda\u4e8b\u52a1\u3002<\/p>\n<ul>\n<li>\n<p><strong>innodb_lock_wait_timeout<\/strong>\uff1a\u8fd9\u662f\u4e00\u4e2a\u5168\u5c40\u53d8\u91cf\uff0c\u7528\u4e8e\u8bbe\u7f6e\u9501\u7b49\u5f85\u7684\u8d85\u65f6\u65f6\u95f4\uff08\u4ee5\u79d2\u4e3a\u5355\u4f4d\uff09\u3002\u9ed8\u8ba4\u503c\u901a\u5e38\u662f50\u79d2\u3002<\/p>\n<pre><code class=\"language-sql\">SET innodb_lock_wait_timeout = 30; -- \u8bbe\u7f6e\u9501\u7b49\u5f85\u8d85\u65f6\u65f6\u95f4\u4e3a30\u79d2<\/code><\/pre>\n<\/li>\n<\/ul>\n<h3>4. <strong>\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b<\/strong><\/h3>\n<p>MySQL\u652f\u6301\u591a\u79cd\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\uff0c\u4e0d\u540c\u7684\u9694\u79bb\u7ea7\u522b\u5bf9\u9501\u7684\u4f7f\u7528\u6709\u4e0d\u540c\u7684\u5f71\u54cd\u3002\u8f83\u4f4e\u7684\u9694\u79bb\u7ea7\u522b\uff08\u5982<code>READ COMMITTED<\/code>\uff09\u53ef\u4ee5\u51cf\u5c11\u9501\u7684\u6301\u6709\u65f6\u95f4\uff0c\u4ece\u800c\u964d\u4f4e\u6b7b\u9501\u7684\u53ef\u80fd\u6027\u3002<\/p>\n<ul>\n<li>\n<p><strong>\u9694\u79bb\u7ea7\u522b\u8bbe\u7f6e<\/strong>\uff1a\u53ef\u4ee5\u901a\u8fc7SQL\u8bed\u53e5\u6216\u914d\u7f6e\u6587\u4ef6\u8bbe\u7f6e\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\u3002<\/p>\n<pre><code class=\"language-sql\">SET TRANSACTION ISOLATION LEVEL READ COMMITTED;<\/code><\/pre>\n<\/li>\n<\/ul>\n<h3>5. <strong>\u9501\u7c92\u5ea6\u63a7\u5236<\/strong><\/h3>\n<p>MySQL\u7684InnoDB\u5b58\u50a8\u5f15\u64ce\u652f\u6301\u591a\u79cd\u9501\u7c92\u5ea6\uff0c\u5305\u62ec\u884c\u9501\u3001\u9875\u9501\u548c\u8868\u9501\u3002\u901a\u8fc7\u5408\u7406\u9009\u62e9\u9501\u7c92\u5ea6\uff0c\u53ef\u4ee5\u51cf\u5c11\u9501\u51b2\u7a81\u7684\u53ef\u80fd\u6027\u3002<\/p>\n<ul>\n<li><strong>\u884c\u9501<\/strong>\uff1aInnoDB\u9ed8\u8ba4\u4f7f\u7528\u884c\u9501\uff0c\u884c\u9501\u7684\u7c92\u5ea6\u8f83\u5c0f\uff0c\u53ef\u4ee5\u51cf\u5c11\u9501\u51b2\u7a81\u3002<\/li>\n<li><strong>\u8868\u9501<\/strong>\uff1a\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0cInnoDB\u4f1a\u81ea\u52a8\u5347\u7ea7\u4e3a\u8868\u9501\uff0c\u4f46\u8fd9\u901a\u5e38\u662f\u4e3a\u4e86\u63d0\u9ad8\u6027\u80fd\u6216\u907f\u514d\u6b7b\u9501\u3002<\/li>\n<\/ul>\n<h3>6. <strong>\u4e8b\u52a1\u987a\u5e8f\u63a7\u5236<\/strong><\/h3>\n<p>\u867d\u7136MySQL\u672c\u8eab\u4e0d\u76f4\u63a5\u63a7\u5236\u4e8b\u52a1\u7684\u6267\u884c\u987a\u5e8f\uff0c\u4f46\u901a\u8fc7\u5408\u7406\u7684\u4e8b\u52a1\u8bbe\u8ba1\u548c\u5e94\u7528\u7a0b\u5e8f\u903b\u8f91\uff0c\u53ef\u4ee5\u51cf\u5c11\u6b7b\u9501\u7684\u53d1\u751f\u3002\u4f8b\u5982\uff0c\u786e\u4fdd\u6240\u6709\u4e8b\u52a1\u4ee5\u76f8\u540c\u7684\u987a\u5e8f\u8bbf\u95ee\u8d44\u6e90\u3002<\/p>\n<h3>7. <strong>\u6b7b\u9501\u65e5\u5fd7\u8bb0\u5f55<\/strong><\/h3>\n<p>MySQL\u4f1a\u8bb0\u5f55\u6b7b\u9501\u4fe1\u606f\uff0c\u5305\u62ec\u6b7b\u9501\u53d1\u751f\u7684\u65f6\u95f4\u3001\u6d89\u53ca\u7684\u4e8b\u52a1\u3001\u9501\u7684\u7c7b\u578b\u7b49\u3002\u8fd9\u4e9b\u65e5\u5fd7\u4fe1\u606f\u53ef\u4ee5\u5e2e\u52a9DBA\u5206\u6790\u6b7b\u9501\u7684\u539f\u56e0\uff0c\u5e76\u8fdb\u884c\u4f18\u5316\u3002<\/p>\n<ul>\n<li>\n<p><strong>\u6b7b\u9501\u65e5\u5fd7<\/strong>\uff1a\u6b7b\u9501\u4fe1\u606f\u901a\u5e38\u8bb0\u5f55\u5728MySQL\u7684\u9519\u8bef\u65e5\u5fd7\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u547d\u4ee4\u67e5\u770b\uff1a<\/p>\n<pre><code class=\"language-sql\">SHOW ENGINE INNODB STATUS;<\/code><\/pre>\n<\/li>\n<\/ul>\n<h1>\u5982\u4f55\u9632\u6b62\u884c\u9501\u53d8\u6210\u8868\u9501<\/h1>\n<h2>\u884c\u9501\u548c\u8868\u9501\u7684\u53d1\u751f<\/h2>\n<p>\u5728MySQL\u7684InnoDB\u5b58\u50a8\u5f15\u64ce\u4e2d\uff0c\u9501\u7684\u7c92\u5ea6\u53ef\u4ee5\u5206\u4e3a\u884c\u9501\u548c\u8868\u9501\u3002\u884c\u9501\u548c\u8868\u9501\u7684\u53d1\u751f\u4e3b\u8981\u4e0e\u4ee5\u4e0b\u56e0\u7d20\u6709\u5173\uff1a<\/p>\n<h3>1. <strong>\u884c\u9501<\/strong><\/h3>\n<p><strong>\u884c\u9501<\/strong>\uff08Row-Level Locking\uff09\u662fInnoDB\u7684\u9ed8\u8ba4\u9501\u673a\u5236\u3002\u884c\u9501\u53ea\u9501\u5b9a\u7279\u5b9a\u7684\u884c\uff0c\u800c\u4e0d\u662f\u6574\u4e2a\u8868\u3002\u884c\u9501\u7684\u7c92\u5ea6\u8f83\u5c0f\uff0c\u53ef\u4ee5\u63d0\u9ad8\u5e76\u53d1\u6027\u80fd\uff0c\u4f46\u4e5f\u4f1a\u589e\u52a0\u9501\u7ba1\u7406\u7684\u590d\u6742\u6027\u3002<\/p>\n<ul>\n<li><strong>\u884c\u9501\u7684\u53d1\u751f<\/strong>\uff1a\n<ul>\n<li>\u5f53\u4e00\u4e2a\u4e8b\u52a1\u5bf9\u67d0\u4e00\u884c\u8fdb\u884c\u4fee\u6539\uff08\u5982<code>UPDATE<\/code>\u3001<code>DELETE<\/code>\uff09\u65f6\uff0cInnoDB\u4f1a\u81ea\u52a8\u5bf9\u8be5\u884c\u52a0\u9501\u3002<\/li>\n<li>\u5982\u679c\u4e8b\u52a1\u4f7f\u7528\u4e86<code>SELECT ... FOR UPDATE<\/code>\u6216<code>SELECT ... LOCK IN SHARE MODE<\/code>\u8bed\u53e5\uff0cInnoDB\u4e5f\u4f1a\u5bf9\u67e5\u8be2\u5230\u7684\u884c\u52a0\u9501\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>2. <strong>\u8868\u9501<\/strong><\/h3>\n<p><strong>\u8868\u9501<\/strong>\uff08Table-Level Locking\uff09\u662f\u9501\u5b9a\u6574\u4e2a\u8868\u7684\u9501\u673a\u5236\u3002\u8868\u9501\u7684\u7c92\u5ea6\u8f83\u5927\uff0c\u4f1a\u963b\u585e\u5176\u4ed6\u4e8b\u52a1\u5bf9\u6574\u4e2a\u8868\u7684\u8bbf\u95ee\uff0c\u56e0\u6b64\u5e76\u53d1\u6027\u80fd\u8f83\u5dee\u3002<\/p>\n<ul>\n<li><strong>\u8868\u9501\u7684\u53d1\u751f<\/strong>\uff1a\n<ul>\n<li><strong>\u663e\u5f0f\u8868\u9501<\/strong>\uff1a\u4f7f\u7528<code>LOCK TABLES<\/code>\u8bed\u53e5\u53ef\u4ee5\u663e\u5f0f\u5730\u5bf9\u8868\u52a0\u9501\u3002<\/li>\n<li><strong>\u9690\u5f0f\u8868\u9501<\/strong>\uff1a\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0cInnoDB\u4f1a\u81ea\u52a8\u5c06\u884c\u9501\u5347\u7ea7\u4e3a\u8868\u9501\uff0c\u4f8b\u5982\uff1a<\/li>\n<li>\u5f53\u4e00\u4e2a\u4e8b\u52a1\u5bf9\u67d0\u4e2a\u8868\u8fdb\u884c\u5168\u8868\u626b\u63cf\u65f6\uff0cInnoDB\u53ef\u80fd\u4f1a\u5c06\u884c\u9501\u5347\u7ea7\u4e3a\u8868\u9501\uff0c\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<li>\u5f53\u4e00\u4e2a\u4e8b\u52a1\u5bf9\u67d0\u4e2a\u8868\u8fdb\u884cDDL\u64cd\u4f5c\uff08\u5982<code>ALTER TABLE<\/code>\uff09\u65f6\uff0cInnoDB\u4f1a\u81ea\u52a8\u5bf9\u8be5\u8868\u52a0\u8868\u9501\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>\u5982\u4f55\u9632\u6b62\u884c\u9501\u53d8\u6210\u8868\u9501<\/h2>\n<p>\u4e3a\u4e86\u907f\u514d\u884c\u9501\u5347\u7ea7\u4e3a\u8868\u9501\uff0c\u53ef\u4ee5\u91c7\u53d6\u4ee5\u4e0b\u63aa\u65bd\uff1a<\/p>\n<h3>1. <strong>\u4f18\u5316\u67e5\u8be2<\/strong><\/h3>\n<ul>\n<li>\n<p><strong>\u907f\u514d\u5168\u8868\u626b\u63cf<\/strong>\uff1a\u5c3d\u91cf\u4f7f\u7528\u7d22\u5f15\u8fdb\u884c\u67e5\u8be2\uff0c\u907f\u514d\u5168\u8868\u626b\u63cf\u3002\u5168\u8868\u626b\u63cf\u4f1a\u5bfc\u81f4InnoDB\u5c06\u884c\u9501\u5347\u7ea7\u4e3a\u8868\u9501\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff0c\u4f7f\u7528<code>WHERE<\/code>\u5b50\u53e5\u6765\u9650\u5236\u67e5\u8be2\u7684\u8303\u56f4\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">SELECT * FROM my_table WHERE id = 123; -- \u4f7f\u7528\u7d22\u5f15<\/code><\/pre>\n<\/li>\n<li>\n<p><strong>\u5206\u9875\u67e5\u8be2<\/strong>\uff1a\u5bf9\u4e8e\u5927\u6570\u636e\u91cf\u7684\u67e5\u8be2\uff0c\u4f7f\u7528\u5206\u9875\u67e5\u8be2\uff08\u5982<code>LIMIT<\/code>\uff09\u6765\u51cf\u5c11\u9501\u5b9a\u7684\u884c\u6570\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">SELECT * FROM my_table ORDER BY id LIMIT 100;<\/code><\/pre>\n<\/li>\n<\/ul>\n<h3>2. <strong>\u51cf\u5c11\u9501\u7684\u6301\u6709\u65f6\u95f4<\/strong><\/h3>\n<ul>\n<li>\n<p><strong>\u7f29\u77ed\u4e8b\u52a1\u65f6\u95f4<\/strong>\uff1a\u5c3d\u91cf\u7f29\u77ed\u4e8b\u52a1\u7684\u6267\u884c\u65f6\u95f4\uff0c\u51cf\u5c11\u9501\u7684\u6301\u6709\u65f6\u95f4\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff0c\u5c06\u957f\u65f6\u95f4\u7684\u64cd\u4f5c\u62c6\u5206\u4e3a\u591a\u4e2a\u5c0f\u4e8b\u52a1\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">START TRANSACTION;\nUPDATE my_table SET column1 = 'value1' WHERE id = 123;\nCOMMIT;<\/code><\/pre>\n<\/li>\n<li>\n<p><strong>\u6279\u91cf\u64cd\u4f5c<\/strong>\uff1a\u5bf9\u4e8e\u6279\u91cf\u64cd\u4f5c\uff0c\u5c3d\u91cf\u51cf\u5c11\u5355\u4e2a\u4e8b\u52a1\u7684\u64cd\u4f5c\u91cf\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff0c\u5c06\u6279\u91cf\u63d2\u5165\u64cd\u4f5c\u62c6\u5206\u4e3a\u591a\u4e2a\u5c0f\u6279\u6b21\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">START TRANSACTION;\nINSERT INTO my_table (column1, column2) VALUES ('value1', 'value2');\nCOMMIT;<\/code><\/pre>\n<\/li>\n<\/ul>\n<h3>3. <strong>\u4f7f\u7528\u8f83\u4f4e\u7684\u9694\u79bb\u7ea7\u522b<\/strong><\/h3>\n<ul>\n<li>\n<p><strong>\u964d\u4f4e\u9694\u79bb\u7ea7\u522b<\/strong>\uff1a\u4f7f\u7528\u8f83\u4f4e\u7684\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\uff08\u5982<code>READ COMMITTED<\/code>\uff09\u53ef\u4ee5\u51cf\u5c11\u9501\u7684\u6301\u6709\u65f6\u95f4\uff0c\u4ece\u800c\u964d\u4f4e\u884c\u9501\u5347\u7ea7\u4e3a\u8868\u9501\u7684\u53ef\u80fd\u6027\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">SET TRANSACTION ISOLATION LEVEL READ COMMITTED;<\/code><\/pre>\n<\/li>\n<\/ul>\n<h3>4. <strong>\u5408\u7406\u4f7f\u7528\u9501<\/strong><\/h3>\n<ul>\n<li>\n<p><strong>\u663e\u5f0f\u9501<\/strong>\uff1a\u5728\u5fc5\u8981\u65f6\u4f7f\u7528\u663e\u5f0f\u9501\uff08\u5982<code>SELECT ... FOR UPDATE<\/code>\uff09\uff0c\u800c\u4e0d\u662f\u9690\u5f0f\u9501\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">SELECT * FROM my_table WHERE id = 123 FOR UPDATE;<\/code><\/pre>\n<\/li>\n<li>\n<p><strong>\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u9501<\/strong>\uff1a\u5c3d\u91cf\u907f\u514d\u5bf9\u4e0d\u9700\u8981\u9501\u5b9a\u7684\u884c\u8fdb\u884c\u9501\u5b9a\u64cd\u4f5c\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff0c\u5bf9\u4e8e\u53ea\u8bfb\u64cd\u4f5c\uff0c\u4f7f\u7528<code>SELECT ... LOCK IN SHARE MODE<\/code>\u800c\u4e0d\u662f<code>SELECT ... FOR UPDATE<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>5. <strong>\u76d1\u63a7\u548c\u4f18\u5316<\/strong><\/h3>\n<ul>\n<li>\n<p><strong>\u76d1\u63a7\u9501\u60c5\u51b5<\/strong>\uff1a\u4f7f\u7528MySQL\u7684\u76d1\u63a7\u5de5\u5177\uff08\u5982<code>SHOW ENGINE INNODB STATUS<\/code>\uff09\u6765\u76d1\u63a7\u9501\u7684\u4f7f\u7528\u60c5\u51b5\uff0c\u53ca\u65f6\u53d1\u73b0\u548c\u89e3\u51b3\u9501\u51b2\u7a81\u95ee\u9898\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">SHOW ENGINE INNODB STATUS;<\/code><\/pre>\n<\/li>\n<li>\n<p><strong>\u4f18\u5316\u8868\u7ed3\u6784<\/strong>\uff1a\u5408\u7406\u8bbe\u8ba1\u8868\u7ed3\u6784\uff0c\u4f7f\u7528\u9002\u5f53\u7684\u7d22\u5f15\uff0c\u51cf\u5c11\u9501\u51b2\u7a81\u7684\u53ef\u80fd\u6027\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff0c\u4e3a\u9891\u7e41\u66f4\u65b0\u7684\u5217\u521b\u5efa\u7d22\u5f15\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">CREATE INDEX idx_column1 ON my_table(column1);<\/code><\/pre>\n<\/li>\n<\/ul>\n<h1>MySQL\u51cf\u5c11\u9501\u7b49\u5f85\u7684\u65b9\u5f0f<\/h1>\n<p>\u5728MySQL\u4e2d\uff0c\u51cf\u5c11\u9501\u7b49\u5f85\u662f\u63d0\u9ad8\u6570\u636e\u5e93\u5e76\u53d1\u6027\u80fd\u7684\u5173\u952e\u3002\u9501\u7b49\u5f85\u662f\u6307\u4e00\u4e2a\u4e8b\u52a1\u5728\u7b49\u5f85\u53e6\u4e00\u4e2a\u4e8b\u52a1\u91ca\u653e\u9501\u8d44\u6e90\u65f6\u6240\u7ecf\u5386\u7684\u65f6\u95f4\u3002\u901a\u8fc7\u4ee5\u4e0b\u51e0\u79cd\u65b9\u5f0f\uff0c\u53ef\u4ee5\u6709\u6548\u51cf\u5c11\u9501\u7b49\u5f85\uff0c\u63d0\u9ad8\u7cfb\u7edf\u7684\u5e76\u53d1\u6027\u80fd\uff1a<\/p>\n<h2>1. <strong>\u4f18\u5316\u67e5\u8be2<\/strong><\/h2>\n<h3>1.1 <strong>\u4f7f\u7528\u7d22\u5f15<\/strong><\/h3>\n<ul>\n<li>\n<p><strong>\u7d22\u5f15\u4f18\u5316<\/strong>\uff1a\u786e\u4fdd\u67e5\u8be2\u4e2d\u4f7f\u7528\u7684\u5217\u4e0a\u6709\u9002\u5f53\u7684\u7d22\u5f15\u3002\u7d22\u5f15\u53ef\u4ee5\u663e\u8457\u51cf\u5c11\u67e5\u8be2\u7684\u6267\u884c\u65f6\u95f4\uff0c\u4ece\u800c\u51cf\u5c11\u9501\u7684\u6301\u6709\u65f6\u95f4\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff0c\u4e3a\u7ecf\u5e38\u67e5\u8be2\u7684\u5217\u521b\u5efa\u7d22\u5f15\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">CREATE INDEX idx_column1 ON my_table(column1);<\/code><\/pre>\n<\/li>\n<li>\n<p><strong>\u8986\u76d6\u7d22\u5f15<\/strong>\uff1a\u4f7f\u7528\u8986\u76d6\u7d22\u5f15\uff08Covering Index\uff09\uff0c\u5373\u7d22\u5f15\u5305\u542b\u4e86\u67e5\u8be2\u6240\u9700\u7684\u6240\u6709\u5217\uff0c\u4ece\u800c\u907f\u514d\u56de\u8868\u64cd\u4f5c\uff0c\u51cf\u5c11\u9501\u7684\u6301\u6709\u65f6\u95f4\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">SELECT column1, column2 FROM my_table WHERE column1 = 'value';<\/code><\/pre>\n<\/li>\n<\/ul>\n<h3>1.2 <strong>\u907f\u514d\u5168\u8868\u626b\u63cf<\/strong><\/h3>\n<ul>\n<li>\n<p><strong>\u907f\u514d\u5168\u8868\u626b\u63cf<\/strong>\uff1a\u5168\u8868\u626b\u63cf\u4f1a\u5bfc\u81f4InnoDB\u5c06\u884c\u9501\u5347\u7ea7\u4e3a\u8868\u9501\uff0c\u4ece\u800c\u589e\u52a0\u9501\u7b49\u5f85\u65f6\u95f4\u3002\u5c3d\u91cf\u4f7f\u7528<code>WHERE<\/code>\u5b50\u53e5\u6765\u9650\u5236\u67e5\u8be2\u7684\u8303\u56f4\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">SELECT * FROM my_table WHERE id = 123; -- \u4f7f\u7528\u7d22\u5f15<\/code><\/pre>\n<\/li>\n<\/ul>\n<h2>2. <strong>\u51cf\u5c11\u9501\u7684\u6301\u6709\u65f6\u95f4<\/strong><\/h2>\n<h3>2.1 <strong>\u7f29\u77ed\u4e8b\u52a1\u65f6\u95f4<\/strong><\/h3>\n<ul>\n<li>\n<p><strong>\u4e8b\u52a1\u62c6\u5206<\/strong>\uff1a\u5c3d\u91cf\u5c06\u957f\u65f6\u95f4\u7684\u4e8b\u52a1\u62c6\u5206\u4e3a\u591a\u4e2a\u5c0f\u4e8b\u52a1\uff0c\u51cf\u5c11\u9501\u7684\u6301\u6709\u65f6\u95f4\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">START TRANSACTION;\nUPDATE my_table SET column1 = 'value1' WHERE id = 123;\nCOMMIT;<\/code><\/pre>\n<\/li>\n<li>\n<p><strong>\u6279\u91cf\u64cd\u4f5c<\/strong>\uff1a\u5bf9\u4e8e\u6279\u91cf\u64cd\u4f5c\uff0c\u5c3d\u91cf\u51cf\u5c11\u5355\u4e2a\u4e8b\u52a1\u7684\u64cd\u4f5c\u91cf\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">START TRANSACTION;\nINSERT INTO my_table (column1, column2) VALUES ('value1', 'value2');\nCOMMIT;<\/code><\/pre>\n<\/li>\n<\/ul>\n<h3>2.2 <strong>\u4f7f\u7528\u8f83\u4f4e\u7684\u9694\u79bb\u7ea7\u522b<\/strong><\/h3>\n<ul>\n<li>\n<p><strong>\u964d\u4f4e\u9694\u79bb\u7ea7\u522b<\/strong>\uff1a\u4f7f\u7528\u8f83\u4f4e\u7684\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\uff08\u5982<code>READ COMMITTED<\/code>\uff09\u53ef\u4ee5\u51cf\u5c11\u9501\u7684\u6301\u6709\u65f6\u95f4\uff0c\u4ece\u800c\u964d\u4f4e\u9501\u7b49\u5f85\u7684\u53ef\u80fd\u6027\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">SET TRANSACTION ISOLATION LEVEL READ COMMITTED;<\/code><\/pre>\n<\/li>\n<\/ul>\n<h2>3. <strong>\u5408\u7406\u4f7f\u7528\u9501<\/strong><\/h2>\n<h3>3.1 <strong>\u663e\u5f0f\u9501<\/strong><\/h3>\n<ul>\n<li>\n<p><strong>\u663e\u5f0f\u9501<\/strong>\uff1a\u5728\u5fc5\u8981\u65f6\u4f7f\u7528\u663e\u5f0f\u9501\uff08\u5982<code>SELECT ... FOR UPDATE<\/code>\uff09\uff0c\u800c\u4e0d\u662f\u9690\u5f0f\u9501\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">SELECT * FROM my_table WHERE id = 123 FOR UPDATE;<\/code><\/pre>\n<\/li>\n<li>\n<p><strong>\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u9501<\/strong>\uff1a\u5c3d\u91cf\u907f\u514d\u5bf9\u4e0d\u9700\u8981\u9501\u5b9a\u7684\u884c\u8fdb\u884c\u9501\u5b9a\u64cd\u4f5c\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff0c\u5bf9\u4e8e\u53ea\u8bfb\u64cd\u4f5c\uff0c\u4f7f\u7528<code>SELECT ... LOCK IN SHARE MODE<\/code>\u800c\u4e0d\u662f<code>SELECT ... FOR UPDATE<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>3.2 <strong>\u9501\u8d85\u65f6\u8bbe\u7f6e<\/strong><\/h3>\n<ul>\n<li>\n<p><strong>\u9501\u8d85\u65f6<\/strong>\uff1a\u8bbe\u7f6e\u9501\u7b49\u5f85\u7684\u8d85\u65f6\u65f6\u95f4\uff0c\u5982\u679c\u4e00\u4e2a\u4e8b\u52a1\u5728\u7b49\u5f85\u9501\u7684\u65f6\u95f4\u8d85\u8fc7\u4e86\u8bbe\u5b9a\u7684\u8d85\u65f6\u65f6\u95f4\uff0c\u5219\u81ea\u52a8\u653e\u5f03\u8be5\u9501\u8bf7\u6c42\uff0c\u5e76\u56de\u6eda\u4e8b\u52a1\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">SET innodb_lock_wait_timeout = 30; -- \u8bbe\u7f6e\u9501\u7b49\u5f85\u8d85\u65f6\u65f6\u95f4\u4e3a30\u79d2<\/code><\/pre>\n<\/li>\n<\/ul>\n<h2>4. <strong>\u76d1\u63a7\u548c\u4f18\u5316<\/strong><\/h2>\n<h3>4.1 <strong>\u76d1\u63a7\u9501\u60c5\u51b5<\/strong><\/h3>\n<ul>\n<li>\n<p><strong>\u76d1\u63a7\u5de5\u5177<\/strong>\uff1a\u4f7f\u7528MySQL\u7684\u76d1\u63a7\u5de5\u5177\uff08\u5982<code>SHOW ENGINE INNODB STATUS<\/code>\uff09\u6765\u76d1\u63a7\u9501\u7684\u4f7f\u7528\u60c5\u51b5\uff0c\u53ca\u65f6\u53d1\u73b0\u548c\u89e3\u51b3\u9501\u51b2\u7a81\u95ee\u9898\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">SHOW ENGINE INNODB STATUS;<\/code><\/pre>\n<\/li>\n<li>\n<p><strong>\u6b7b\u9501\u65e5\u5fd7<\/strong>\uff1a\u8bb0\u5f55\u6b7b\u9501\u4fe1\u606f\uff0c\u5206\u6790\u6b7b\u9501\u7684\u6839\u672c\u539f\u56e0\uff0c\u5e76\u8fdb\u884c\u4f18\u5316\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">SHOW ENGINE INNODB STATUS;<\/code><\/pre>\n<\/li>\n<\/ul>\n<h3>4.2 <strong>\u4f18\u5316\u8868\u7ed3\u6784<\/strong><\/h3>\n<ul>\n<li>\n<p><strong>\u5408\u7406\u8bbe\u8ba1\u8868\u7ed3\u6784<\/strong>\uff1a\u5408\u7406\u8bbe\u8ba1\u8868\u7ed3\u6784\uff0c\u4f7f\u7528\u9002\u5f53\u7684\u7d22\u5f15\uff0c\u51cf\u5c11\u9501\u51b2\u7a81\u7684\u53ef\u80fd\u6027\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff0c\u4e3a\u9891\u7e41\u66f4\u65b0\u7684\u5217\u521b\u5efa\u7d22\u5f15\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">CREATE INDEX idx_column1 ON my_table(column1);<\/code><\/pre>\n<\/li>\n<\/ul>\n<h2>5. <strong>\u5e76\u53d1\u63a7\u5236<\/strong><\/h2>\n<h3>5.1 <strong>\u4e50\u89c2\u9501<\/strong><\/h3>\n<ul>\n<li>\n<p><strong>\u4e50\u89c2\u9501<\/strong>\uff1a\u4f7f\u7528\u4e50\u89c2\u9501\u673a\u5236\uff0c\u5047\u8bbe\u6570\u636e\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u4e0d\u4f1a\u53d1\u751f\u51b2\u7a81\uff0c\u4ece\u800c\u51cf\u5c11\u9501\u7684\u4f7f\u7528\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff0c\u4f7f\u7528\u7248\u672c\u53f7\u6216\u65f6\u95f4\u6233\u6765\u5b9e\u73b0\u4e50\u89c2\u9501\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">UPDATE my_table SET column1 = 'value1', version = version + 1 WHERE id = 123 AND version = 1;<\/code><\/pre>\n<\/li>\n<\/ul>\n<h3>5.2 <strong>\u60b2\u89c2\u9501<\/strong><\/h3>\n<ul>\n<li>\n<p><strong>\u60b2\u89c2\u9501<\/strong>\uff1a\u5728\u5fc5\u8981\u65f6\u4f7f\u7528\u60b2\u89c2\u9501\u673a\u5236\uff0c\u786e\u4fdd\u6570\u636e\u7684\u4e00\u81f4\u6027\u3002<\/p>\n<ul>\n<li>\u4f8b\u5982\uff0c\u4f7f\u7528<code>SELECT ... FOR UPDATE<\/code>\u6765\u9501\u5b9a\u884c\uff1a<\/li>\n<\/ul>\n<pre><code class=\"language-sql\">SELECT * FROM my_table WHERE id = 123 FOR UPDATE;<\/code><\/pre>\n<\/li>\n<\/ul>\n<h1>\u9879\u76ee\u4e2d\u7684kafka\u9650\u6d41\u662f\u5982\u4f55\u505a\u7684<\/h1>\n<h1>kafka\u8fdb\u884c\u9650\u6d41\u5982\u4f55\u4fdd\u8bc1\u5f02\u6b65\u7ed3\u679c\u80fd\u591f\u88ab\u83b7\u53d6\uff08\u7531\u8c03\u7528\u4e4b\u95f4\u4f7f\u7528\u957f\u8fde\u63a5\u8fd8\u662f\u77ed\u8fde\u63a5\u5f15\u7533\u51fa\u6765\u7684\uff09<\/h1>\n<h1>\u4e00\u4ebf\u6761\u6570\u636e\u8fdb\u884c\u6e05\u6d17\uff0c\u591a\u7ebf\u7a0b\u5982\u4f55\u64cd\u4f5c<\/h1>\n","protected":false},"excerpt":{"rendered":"<p>\u5168\u7a0b\u6ca1\u95ee\u8fc7\u5f88\u591aJava\u4e0a\u7684\u4e1c\u897f\uff0c\u90fd\u662fMySQL\u4e0a\u7684\u3002\ud83d\ude14 B\u6811\u548cB+\u6811 B\u6811 B \u6811\u662f\u4e00\u79cd\u591a\u8def\u5e73\u8861\u67e5\u627e\u6811\uff0c\u4e3a\u4e86\u66f4 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[32],"class_list":["post-125","post","type-post","status-publish","format-standard","hentry","category-interview","tag-32"],"_links":{"self":[{"href":"https:\/\/blog.eastfond.com\/index.php?rest_route=\/wp\/v2\/posts\/125","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.eastfond.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.eastfond.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.eastfond.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.eastfond.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=125"}],"version-history":[{"count":7,"href":"https:\/\/blog.eastfond.com\/index.php?rest_route=\/wp\/v2\/posts\/125\/revisions"}],"predecessor-version":[{"id":423,"href":"https:\/\/blog.eastfond.com\/index.php?rest_route=\/wp\/v2\/posts\/125\/revisions\/423"}],"wp:attachment":[{"href":"https:\/\/blog.eastfond.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=125"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.eastfond.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=125"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.eastfond.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=125"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}