{"id":10006919,"date":"2022-11-27T17:28:32","date_gmt":"2022-11-27T09:28:32","guid":{"rendered":"https:\/\/ityet.com\/?p=10006919"},"modified":"2022-11-27T17:28:32","modified_gmt":"2022-11-27T09:28:32","slug":"mysql-%e6%95%b0%e6%8d%ae%e5%ba%93%e7%b4%a2%e5%bc%95%e6%8a%80%e6%9c%af%e5%8e%9f%e7%90%86%e5%88%9d%e6%8e%a2","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10006919","title":{"rendered":"MySQL \u6570\u636e\u5e93\u7d22\u5f15\u6280\u672f\u539f\u7406\u521d\u63a2"},"content":{"rendered":"<h2>\u6982\u8ff0<\/h2>\n<h3>\u4ec0\u4e48\u662f\u7d22\u5f15<\/h3>\n<p>\u4e00\u672c\u4e66 500 \u9875\u7684\u4e66\uff0c\u5982\u679c\u6ca1\u6709\u76ee\u5f55\uff0c\u76f4\u63a5\u53bb\u627e\u67d0\u4e2a\u77e5\u8bc6\u70b9\uff0c\u53ef\u80fd\u9700\u8981\u627e\u4e00\u4f1a\u513f\uff0c\u4f46\u662f\u501f\u52a9\u524d\u9762\u7684\u76ee\u5f55\uff0c\u5c31\u53ef\u4ee5\u5feb\u901f\u627e\u5230\u5bf9\u5e94\u77e5\u8bc6\u70b9\u5728\u4e66\u7684\u54ea\u4e00\u9875\u3002\u8fd9\u91cc\u7684\u76ee\u5f55\u5c31\u662f\u7d22\u5f15\u3002<\/p>\n<p>\u6240\u4ee5\uff0c\u4e3a\u4ec0\u4e48\u4f1a\u6709\u7d22\u5f15\uff1f\u4e3a\u4e86\u63d0\u9ad8\u6570\u636e\u67e5\u8be2\u6548\u7387\u3002<\/p>\n<h2>\u5e38\u89c1\u7d22\u5f15\u7b97\u6cd5<\/h2>\n<p>\u6700\u7b80\u5355\u4e5f\u6700\u5bb9\u6613\u60f3\u5230\u7684\u7d22\u5f15\u7b97\u6cd5\u5c31\u662f\u6709\u5e8f\u6570\u7ec4\u4e86\uff0c\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u6570\u7ec4\uff0c\u6570\u7ec4\u6309\u7167\u987a\u5e8f\u6392\u5217\uff0c<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042912713\" alt=\"img\" title=\"img\" loading=\"lazy\"><\/p>\n<p>\u6211\u4eec\u8981\u67e5\u627e\u67d0\u4e00\u6761\u8bb0\u5f55\uff0c\u4f7f\u7528\u4e8c\u5206\u6cd5\u5c31\u53ef\u4ee5\u5feb\u901f\u5f97\u5230(log N)\uff0c\u4ece\u56fe\u4e2d\u6211\u4eec\u53ef\u4ee5\u770b\u51fa\uff0c\u6709\u5e8f\u6570\u7ec4\u4f5c\u4e3a\u7d22\u5f15\u65f6\uff0c\u5904\u7406\u7b49\u503c\u67e5\u8be2\u548c\u8303\u56f4\u67e5\u8be2\u65f6\u6027\u80fd\u4f1a\u975e\u5e38\u4f18\u79c0\u3002\u65e2\u7136\u8fd9\u4e48\u4f18\u79c0\uff0c\u4e3a\u4ec0\u4e48\u6211\u4eec\u4e0d\u4f7f\u7528\u5b83\u5462\uff1f<\/p>\n<p>\u56e0\u4e3a\u5b83\u7684\u63d2\u5165\u6027\u80fd\u5f88\u5dee\uff0c\u6bcf\u6b21\u5f80\u4e2d\u95f4\u63d2\u5165\u4e00\u6761\u8bb0\u5f55\uff0c\u5c31\u5fc5\u987b\u632a\u52a8\u540e\u9762\u6240\u6709\u7684\u8bb0\u5f55\uff0c\u8fd9\u4e2a\u6210\u672c\u592a\u9ad8\u4e86\u3002<\/p>\n<p>\u7b2c\u4e8c\u79cd\u7b97\u6cd5\u65f6\u54c8\u5e0c\u8868\uff0c\u54c8\u5e0c\u8868\u65f6\u4e00\u79cd KV \u5f62\u5f0f\u5b58\u50a8\u7684\u6570\u636e\u7ed3\u6784\uff0c\u6bd4\u5982\u6211\u4eec\u5e73\u65f6\u7528\u7684 HashMap\u3002\u54c8\u5e0c\u8868\u7684\u601d\u8def\u975e\u5e38\u7b80\u5355\uff0c\u7528\u4e00\u4e2a\u54c8\u5e0c\u51fd\u6570\u628aKey \u6362\u7b97\u6210\u4e00\u4e2a\u786e\u5b9a\u7684\u4f4d\u7f6e\uff0c\u628a V \u653e\u5230\u8fd9\u4e2a\u4f4d\u7f6e\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042912714\" alt=\"img\" title=\"img\" loading=\"lazy\"><\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u770b\u5f97\u51fa\uff0c\u54c8\u5e0c\u8868\u8fd9\u79cd\u6570\u636e\u7ed3\u6784\u5728\u8fdb\u884c\u7b49\u503c\u67e5\u8be2\u7684\u65f6\u5019\uff0c\u6548\u7387\u65f6\u975e\u5e38\u9ad8\u7684\uff0c\u6211\u4eec\u5e38\u7528\u7684 Redis \u4ee5\u53ca\u4ee5\u524d\u6bd4\u8f83\u6d41\u884c\u7684 Memcached \u90fd\u4f7f\u7528\u4e86\u54c8\u5e0c\u8868\u3002\u4f46\u662f\u54c8\u5e0c\u8868\u6709\u4e2a\u81f4\u547d\u7f3a\u9677\uff0c\u5c31\u662f\u5bf9\u8303\u56f4\u67e5\u8be2\u7684\u652f\u6301\u6027\u975e\u5e38\u5dee\uff0c\u56e0\u4e3a\u6570\u636e\u7684\u5b58\u50a8\u65f6\u65e0\u5e8f\u7684\uff0c\u65e0\u8bba\u6211\u4eec\u8981\u67e5\u8be2\u7684\u8303\u56f4\u6709\u591a\u5927\uff0c\u90fd\u5fc5\u987b\u628a\u6240\u6709\u7684\u6570\u636e\u5168\u90e8\u4fbf\u5229\u4e00\u904d\u505a\u4e2a\u6392\u5e8f\u624d\u884c\u3002<\/p>\n<p>\u5728\u8bb2\u7b2c\u4e09\u79cd\u7d22\u5f15\u65b9\u5f0f\u4e4b\u524d\uff0c\u6211\u4eec\u7b80\u5355\u4e86\u89e3\u4e0b\u673a\u68b0\u786c\u76d8\u5b58\u53d6\u6570\u636e\u7684\u539f\u7406<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042912715\" alt=\"image-20210326092749979\" title=\"image-20210326092749979\" loading=\"lazy\"><\/p>\n<p>\u8981\u8bbf\u95ee\u78c1\u76d8\u4e0a\u7684\u67d0\u4e2a\u6761\u6570\u636e\uff0c\u6211\u4eec\u9700\u8981\u901a\u8fc7\u78c1\u9053\uff0c\u6247\u533a\u6765\u786e\u5b9a\u6570\u636e\u6240\u5728\u7684 Block\uff0c\u7136\u540e\u901a\u8fc7 Offset  \u5c31\u53ef\u4ee5\u5b9a\u4f4d\u5230\u78c1\u76d8\u4e0a\u7684\u4efb\u610f\u4e00\u4e2a\u5b57\u8282\u3002\u4ece\u78c1\u76d8\u4e0a\u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u90fd\u662f\u4ee5 Block \u7684\u5f62\u5f0f\u8bfb\u53d6\u7684\u3002\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u4e00\u4e2a Block \u7684\u5927\u5c0f\u662f 512 Bytes\uff0c\u5f53\u7136\uff0c\u8fd9\u662f\u9488\u5bf9\u78c1\u76d8\u8bbe\u5907\u7684\uff0c\u5bf9\u4e8e Linux \u7684\u6587\u4ef6\u7cfb\u7edf\u6765\u8bf4\uff0c\u4e00\u4e2a Block \u4e00\u822c\u662f 4KB\u3002InnoDB \u6570\u636e\u5b58\u53d6\u662f\u4ee5\u6570\u636e\u9875\u4e3a\u5355\u4f4d\u7684\uff0c\u6570\u636e\u9875\u76f8\u6bd4\u78c1\u76d8 Block \u8981\u5927\u4e00\u4e9b\uff0c\u4e00\u822c\u9ed8\u8ba4\u662f 16KB\u3002\u4e3a\u4e86\u7b80\u5316\u6574\u4e2a\u6a21\u578b\uff0c\u6211\u4eec\u8fd9\u91cc\u629b\u5f00\u590d\u6742\u7684\u6570\u636e\u9875\u6216\u8005\u6587\u4ef6\u7cfb\u7edf Block \u6982\u5ff5\uff0c\u4ece\u78c1\u76d8\u7684 Block \u5f00\u59cb\u8bf4\u8d77<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042912716\" alt=\"image-20210326092835533\" title=\"image-20210326092835533\" loading=\"lazy\"><\/p>\n<p>\u5047\u8bbe\u6211\u4eec\u7684\u6570\u636e\u5e93\u91cc\u9762\u5b58\u50a8\u4e86 1000 \u6761\u8bb0\u5f55\uff0c\u6bcf\u6761\u8bb0\u5f55\u5360\u7528 128 Bytes\uff0c\u524d\u9762\u6211\u4eec\u8bf4\u8fc7\uff0c\u4e00\u4e2a\u78c1\u76d8\u7684 Block \u80fd\u591f\u5b58\u50a8 512 Bytes\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u4e00\u4e2a Block \u53ef\u4ee5\u5b58\u50a8 4 \u6761\u8bb0\u5f55\uff0c\u5b58\u50a8\u8fd9\u4e9b\u8bb0\u5f55\uff0c\u4e00\u5171\u9700\u8981 250 \u4e2a Blocks\u3002\u5f53\u6211\u4eec\u9700\u8981\u67e5\u8be2\u4e00\u6761\u6570\u636e\u65f6\uff0c\u6700\u591a\u9700\u8981\u4ece\u78c1\u76d8\u52a0\u8f7d 250 \u4e2aBlocks\uff0c\u60f3\u60f3\u8bfb\u53d6 250 \u6b21\u78c1\u76d8\u4f1a\u6709\u591a\u6162\uff01<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042912717\" alt=\"image-20210326092923323\" title=\"image-20210326092923323\" loading=\"lazy\"><\/p>\n<p>\u4e3a\u4e86\u51cf\u5c11\u5bf9\u78c1\u76d8\u7684\u8bbf\u95ee\u6b21\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u628a\u6240\u6709\u8bb0\u5f55\u7684 id \u5355\u72ec\u62ff\u51fa\u6765\u521b\u5efa\u4e00\u4e2a\u7d22\u5f15 L1\uff0c\u8fd9\u4e2a id \u548c\u6307\u5411\u539f\u59cb\u6570\u636e\u7684\u5730\u5740\u7ec4\u6210\u4e86\u4e00\u4e2a\u65b0\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u7684\u957f\u5ea6\u8fd9\u91cc\u662f 16 Bytes\uff0c\u7d22\u5f15\u4e5f\u662f\u9700\u8981\u5b58\u50a8\u5230\u78c1\u76d8\u7684\uff0c\u4e00\u4e2a Block \u53ef\u4ee5\u5b58\u50a8 32 \u6761\u7d22\u5f15\u8bb0\u5f55\uff0c1000\u6761\u7d22\u5f15\u8bb0\u5f55\u9700\u8981 \uff081000\/32=31.25\uff09 32 \u4e2a Blocks\u3002\u8fd9\u65f6\u5019\u6211\u4eec\u9700\u8981\u67e5\u8be2\u4e00\u6761\u6570\u636e\u65f6\uff0c\u5c31\u53d8\u6210\u4e86\u5148\u4ece\u7d22\u5f15\u8868\u4e2d\u67e5\u8be2\u51fa\u5bf9\u5e94\u6570\u636e\u7684\u6307\u9488\uff08\u8bfb\u53d6 32 \u4e2a Blocks\uff09\uff0c\u7136\u540e\u518d\u53bb\u6e90\u6570\u636e\u8868\u4e2d\u6839\u636e\u5730\u5740\u76f4\u63a5\u8bfb\u53d6\u8bb0\u5f55\u6240\u5728\u7684\u6570\u636e\u5757\uff081\u4e2aBlock\uff09\u3002\u770b\uff0c\u901a\u8fc7\u589e\u52a0\u4e00\u4e2a\u7d22\u5f15\uff0c\u6211\u4eec\u6210\u529f\u7684\u5c06\u78c1\u76d8\u8bfb\u53d6\u6b21\u6570\u4ece 250 \u6b21\u51cf\u5c11\u5230\u4e86 33 \u6b21\u3002\u6211\u4eec\u53ef\u4e0d\u53ef\u4ee5\u8ba9\u8bfb\u53d6\u78c1\u76d8\u6b21\u6570\u66f4\u5c11\u5462\uff0c\u5f53\u7136\u53ef\u4ee5\uff01\u518d\u589e\u52a0\u4e00\u7ea7\u7d22\u5f15\u5457\uff01<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042912718\" alt=\"image-20210326093000953\" title=\"image-20210326093000953\" loading=\"lazy\"><\/p>\n<p>\u65b0\u6dfb\u52a0\u7684\u8fd9\u4e00\u7ea7\u7d22\u5f15\u6307\u5411\u4e86\u524d\u9762\u6211\u4eec\u6dfb\u52a0\u7684\u7d22\u5f15 L1 \u6240\u5728\u7684\u6570\u636e\u5757\u3002\u5728\u8fd9\u4e00\u7ea7\u7d22\u5f15\u4e0a\uff0c\u6bcf\u4e00\u6761\u8bb0\u5f55\u90fd\u5bf9\u5e94\u4e86 L1 \u7d22\u5f15\u6240\u5728\u7684\u6570\u636e\u5757\uff0c\u4e5f\u5c31\u662f 32 \u6761L1\u7d22\u5f15\u8bb0\u5f55\u6240\u5728\u7684\u4f4d\u7f6e\u30021000\u6761\u6570\u636e\u5728\u8fd9\u91cc\u8fd8\u5269\u591a\u5c11\u5462\uff0c\u524d\u9762\u6211\u4eec\u8bf4\u8fc7\uff0c1000\u6761\u6570\u636e\u5171\u9700\u8981 32 \u4e2a L1 \u7d22\u5f15 Block\uff0c\u5bf9\u5e94\u5728\u8fd9\u91cc\u4e5f\u5c31\u662f\u9700\u8981 32 \u6761 L2 \u7d22\u5f15\uff0c\u603b\u7a7a\u95f4\u5360\u7528\u624d 32&#215;16 = 512 Bytes\uff0c\u521a\u597d\u4e00\u4e2a\u78c1\u76d8 Block \u5927\u5c0f\u3002\u5230\u8fd9\u4e00\u7ea7\uff0c\u6211\u4eec\u9700\u8981\u8bbf\u95ee\u78c1\u76d8\u7684\u6b21\u6570\u5c31\u53d8\u6210\u4e86 1+1+1=3 \u4e86\uff01<\/p>\n<p>\u6211\u4eec\u628a\u4e0a\u9762\u8fd9\u4e2a\u56fe\u62bd\u8c61\u4e00\u4e0b\uff0c\u53bb\u6389\u5176\u4e2d\u7684\u7ec6\u8282\uff0c<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042912719\" alt=\"image-20210326093031086\" title=\"image-20210326093031086\" loading=\"lazy\"><\/p>\n<p>\u5f53\u6211\u4eec\u628a\u5b83\u65cb\u8f6c\u4e00\u4e0b\u7684\u65f6\u5019\uff0c\u6211\u4eec\u5c31\u5f97\u5230\u4e86\u8fd9\u6837\u4e00\u79cd\u6570\u636e\u7ed3\u6784<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042912720\" alt=\"image-20210326093055460\" title=\"image-20210326093055460\" loading=\"lazy\"><\/p>\n<p>\u770b\uff01\u8fd9\u4e0d\u5c31\u662f\u4e00\u68f5\u6811\u561b<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042912721\" alt=\"image-20210326104832514\" title=\"image-20210326104832514\" loading=\"lazy\"><\/p>\n<p>\u8bf4\u5230\u6811\uff0c\u6211\u4eec\u77e5\u9053\u6700\u7b80\u5355\u7684\u5c31\u662f\u4e8c\u53c9\u6811\u4e86\uff0c\u4e8c\u53c9\u6811\u7684\u5178\u578b\u7279\u70b9\u662f\u6709\u5e8f\uff0c\u5de6\u5b50\u6811\u5c0f\u4e8e\u7236\u8282\u70b9\uff0c\u53f3\u5b50\u6811\u5927\u4e8e\u7236\u8282\u70b9\u3002\u65e0\u8bba\u662f\u641c\u7d22\u6548\u7387\u8fd8\u662f\u63d2\u5165\u6548\u7387\uff0c\u4e8c\u53c9\u6811\u7684\u6548\u7387\u90fd\u662f\u975e\u5e38\u9ad8\u7684\uff08log N\uff09\uff0c\u4f46\u662f\u5927\u591a\u6570\u6570\u636e\u5e93\u5e76\u4e0d\u4f7f\u7528\u5b83\uff0c\u8fd9\u662f\u4e3a\u4ec0\u4e48\u5462\uff1f<\/p>\n<p>\u56e0\u4e3a\u6211\u4eec\u7684\u6570\u636e\u662f\u5b58\u50a8\u5728\u78c1\u76d8\u4e0a\u7684\uff0c\u7a0b\u5e8f\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u8981\u4f7f\u7528\u6570\u636e\uff0c\u5fc5\u987b\u4ece\u78c1\u76d8\u628a\u6570\u636e\u52a0\u8f7d\u5230\u5185\u5b58\u624d\u884c\u3002\u4e8c\u53c9\u6811\u968f\u7740\u8282\u70b9\u7684\u589e\u591a\uff0c\u6811\u7684\u9ad8\u5ea6\u9875\u8d8a\u6765\u8d8a\u9ad8\uff0c\u5bf9\u5e94\u5230\u78c1\u76d8\u8bbf\u95ee\u4e0a\uff0c\u6211\u4eec\u5c31\u9700\u8981\u8bbf\u95ee\u66f4\u591a\u7684\u6570\u636e\u5757\u3002\u5f53\u6211\u4eec\u7684\u6570\u636e\u5b58\u50a8\u5728\u673a\u68b0\u786c\u76d8\u7684\u65f6\u5019\uff0c\u4ece\u78c1\u76d8\u968f\u673a\u8bfb\u53d6\u4e00\u4e2a\u6570\u636e\u5757\u5c31\u9700\u8981 10ms \u5de6\u53f3\u7684\u5bfb\u5740\u65f6\u95f4\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u6211\u4eec\u626b\u63cf\u4e00\u4e2a 100 \u4e07\u884c\u7684\u8868\uff0c\u5355\u72ec\u8bbf\u95ee\u4e00\u884c\u5c31\u53ef\u80fd\u9700\u8981 20 \u4e2a 10ms\uff0c\u53ef\u60f3\u53ef\u77e5\u8fd9\u4e2a\u67e5\u8be2\u4f1a\u6709\u591a\u6162\uff01<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042912722\" alt=\"_images\/binary-tree.png\" title=\"_images\/binary-tree.png\" loading=\"lazy\"><\/p>\n<p>\u5f53\u7136\uff0c\u6211\u4eec\u8fd9\u68f5\u6811\u53ef\u4e0d\u662f\u4e8c\u53c9\u6811\uff0c\u56e0\u4e3a\u6bcf\u4e2a\u5206\u652f\u90fd\u53ef\u80fd\u6709\u5f88\u591a\u6761\u8bb0\u5f55\u3002\u6211\u4eec\u628a\u8fd9\u79cd\u6811\u79f0\u4e3a N \u53c9\u6811\uff0c\u4e5f\u5c31\u662f\u591a\u53c9\u6811\uff0c\u6811\u7684\u5206\u53c9\u8d8a\u591a\uff0c\u6bcf\u4e2a\u8282\u70b9\u7684\u5b50\u8282\u70b9\u5c31\u8d8a\u591a\uff0c\u6811\u7684\u9ad8\u5ea6\u5c31\u8d8a\u4f4e\u3002\u56e0\u6b64\u5c31\u6709B-Tree \u548c B+Tree\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042912723\" alt=\"Image 1\" title=\"Image 1\" loading=\"lazy\"><\/p>\n<h2>B+Tree \u7d22\u5f15<\/h2>\n<p>\u8bb2\u5230 B+ \u6811\u7d22\u5f15\uff0c\u6211\u4eec\u5c31\u4e0d\u5f97\u4e0d\u4e00\u4e0b B \u6811\u7d22\u5f15\uff0c\u524d\u9762\u6211\u4eec\u7b80\u5355\u4e86\u89e3\u4e86\u4e0b\u4e8c\u53c9\u6811\uff0c\u6211\u4eec\u77e5\u9053\uff0c\u4e8c\u53c9\u6811\u7684\u6811\u9ad8\u592a\u5927\uff0c\u4f1a\u4e25\u91cd\u5f71\u54cd\u67e5\u8be2\u6548\u7387\uff0c\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u5c31\u6709\u4e86 B \u6811<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042912724\" alt=\"\u7d22\u5f15\" title=\"\u7d22\u5f15\" loading=\"lazy\"><\/p>\n<p>B\u6811\u662f\u4e3a\u4e86\u66f4\u597d\u7684\u5b9e\u73b0\u7d22\u5f15\u7ed3\u6784\u800c\u88ab\u521b\u9020\u51fa\u6765\u7684\uff0c\u5b83\u5927\u5e45\u5ea6\u51cf\u5c11\u4e86\u78c1\u76d8\u8bbf\u95ee\u7684\u6b21\u6570\u3002\u9664\u6b64\u4e4b\u5916\uff0c\u5b83\u8fd8\u5145\u5206\u5229\u7528\u4e86\u201c\u5c40\u90e8\u6027\u539f\u7406\u201d\uff08\u6570\u636e\u6709\u5e8f\uff0c\u76f8\u5173\u6027\u5f3a\uff09\u3002<\/p>\n<blockquote>\n<p>\u5c40\u90e8\u6027\u539f\u7406\uff1a\u5728\u4e00\u6bb5\u65f6\u95f4\u5185\uff0c\u6574\u4e2a\u7a0b\u5e8f\u7684\u6267\u884c\u4ec5\u9650\u4e8e\u7a0b\u5e8f\u7684\u67d0\u4e00\u90e8\u5206\uff0c\u76f8\u5e94\u7684\uff0c\u6267\u884c\u6240\u8bbf\u95ee\u7684\u5b58\u50a8\u7a7a\u95f4\u4e5f\u5c40\u9650\u4e8e\u67d0\u4e2a\u5185\u5b58\u533a\u57df\u3002\u5c40\u90e8\u6027\u539f\u7406\u5206\u4e3a\u65f6\u95f4\u5c40\u90e8\u6027\u548c\u7a7a\u95f4\u5c40\u90e8\u6027\u3002<\/p>\n<ul>\n<li>\u65f6\u95f4\u5c40\u90e8\u6027\uff1a\u88ab\u5f15\u7528\u8fc7\u4e00\u6b21\u7684\u5b58\u50a8\u5668\u4f4d\u7f6e\u5728\u672a\u6765\u4f1a\u88ab\u591a\u6b21\u5f15\u7528\uff08\u901a\u5e38\u5728\u5faa\u73af\u4e2d\uff09<\/li>\n<li>\u7a7a\u95f4\u5c40\u90e8\u6027\uff1a\u5982\u679c\u4e00\u4e2a\u5b58\u50a8\u5668\u7684\u4f4d\u7f6e\u88ab\u5f15\u7528\uff0c\u90a3\u4e48\u5c06\u6765\u5b83\u9644\u8fd1\u7684\u4f4d\u7f6e\u4e5f\u4f1a\u88ab\u5f15\u7528<\/li>\n<\/ul>\n<\/blockquote>\n<p>\u5229\u7528\u5c40\u90e8\u6027\u539f\u7406\u53ef\u4ee5\u5b9e\u73b0\u78c1\u76d8\u9884\u8bfb\uff0c\u524d\u9762\u63d0\u8fc7\uff0cInnoDB\u4e00\u6b21\u662f\u8bfb\u53d6\u4e00\u9875\u7684\u6570\u636e\uff0816K\uff09\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u6bcf\u6b21\u6211\u4eec\u5b9e\u9645\u52a0\u8f7d\u7684\u6570\u636e\u6bd4\u6211\u4eec\u9700\u8981\u7684\u53ef\u80fd\u4f1a\u591a\u4e00\u4e9b\uff0c\u8fd9\u4e9b\u6570\u636e\u53ef\u4ee5\u7f13\u5b58\u5728\u5185\u5b58\u4e2d\uff0c\u672a\u6765\u6211\u4eec\u9700\u8981\u8bfb\u53d6\u7684\u65f6\u5019\uff0c\u5c31\u53ef\u4ee5\u907f\u514d\u78c1\u76d8 IO \u4e86\u3002<\/p>\n<p>\u4f46\u662fB\u6811\u6709\u7740\u4e0b\u9762\u4e24\u4e2a\u7f3a\u9677<\/p>\n<ul>\n<li>\u6bcf\u4e2a\u8282\u70b9\u90fd\u5b58\u50a8\u6570\u636e\uff0c\u56e0\u6b64\u7d22\u5f15\u4f1a\u53d8\u5f97\u5f88\u5927\uff0c\u6bcf\u4e2a Block \u80fd\u591f\u5bb9\u7eb3\u7684\u7d22\u5f15\u6570\u5c31\u4f1a\u53d8\u5c11\uff0c\u6211\u4eec\u4e5f\u5c31\u9700\u8981\u8bbf\u95ee\u66f4\u591a\u6b21\u7684\u78c1\u76d8<\/li>\n<li>\u5bf9\u8303\u56f4\u67e5\u8be2\u652f\u6301\u4e0d\u662f\u5f88\u597d\uff0c\u9700\u8981\u4e2d\u5e8f\u904d\u5386<\/li>\n<\/ul>\n<p>\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e24\u4e2a\u95ee\u9898\uff0cB+ \u6811\u5c31\u8bde\u751f\u4e86\uff0c<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042912725\" alt=\"\u7d22\u5f15\" title=\"\u7d22\u5f15\" loading=\"lazy\"><\/p>\n<p>B+\u6811\u53ea\u6709\u53f6\u5b50\u8282\u70b9\u624d\u5b58\u50a8\u6570\u636e\uff0c\u5176\u5b83\u8282\u70b9\u4e0d\u518d\u5b58\u50a8\u6570\u636e\uff0c\u6240\u6709\u7684\u53f6\u5b50\u8282\u70b9\u90fd\u5728\u540c\u4e00\u5c42\u4e0a\uff0c\u53f6\u5b50\u8282\u70b9\u4e4b\u95f4\u589e\u52a0\u4e86\u4e00\u6761\u94fe\u8868\uff0c\u901a\u8fc7\u8fd9\u6761\u94fe\u8868\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u4f9d\u6b21\u76f4\u63a5\u904d\u5386\u6240\u6709\u6570\u636e\u3002\u8fd9\u4e9b\u53d8\u5316\uff0c\u8ba9 B+ \u6811\u62e5\u6709\u4e86\u6bd4 B \u6811\u66f4\u4f18\u79c0\u7684\u7279\u6027\uff1a<\/p>\n<ul>\n<li>\u975e\u53f6\u5b50\u8282\u70b9\u4e0d\u5b58\u50a8\u6570\u636e\uff0c\u53ef\u4ee5\u5b9e\u73b0\u67e5\u8be2\u52a0\u901f\uff08\u4e00\u6b21\u78c1\u76d8\u8bbf\u95ee\u53ef\u4ee5\u8bfb\u53d6\u66f4\u591a\u7684\u7d22\u5f15\u8bb0\u5f55\uff0c\u51cf\u5c11\u78c1\u76d8\u8bbf\u95ee\uff09<\/li>\n<li>\u8303\u56f4\u67e5\u8be2\u66f4\u52a0\u4f18\u79c0\uff0c\u53ef\u4ee5\u987a\u7740\u53f6\u5b50\u8282\u70b9\u7684\u94fe\u8868\u76f4\u63a5\u67e5\u8be2\u51fa\u67d0\u4e00\u4e2a\u8303\u56f4\u5185\u7684\u6570\u636e<\/li>\n<\/ul>\n<p>B+\u6570\u662f\u4e00\u68f5 N \u53c9\u6811\uff0cN \u7684\u5927\u5c0f\u53d6\u51b3\u4e8e\u7d22\u5f15\u5b57\u6bb5\u7684\u5927\u5c0f\uff0c\u4ee5\u6574\u6570\u5b57\u6bb5\u7d22\u5f15\u4e3a\u4f8b\uff0cN\u22481200\uff0c\u5f53\u6811\u9ad8\u4e3a 4 \u7684\u65f6\u5019\uff0c\u5c31\u662f 1200 \u7684 3 \u6b21\u65b9\uff0c17\u4ebf\u3002\u4e00\u4e2a 10 \u4ebf\u884c\u7684\u8868\u4e0a\u4e00\u4e2a\u6574\u6570\u5b57\u6bb5\u7d22\u5f15\uff0c\u67e5\u627e\u4e00\u4e2a\u503c\u6700\u591a\u53ea\u9700\u8981\u8bbf\u95ee 3 \u6b21\u78c1\u76d8\uff08\u6811\u6839\u4e00\u822c\u5728\u5185\u5b58\u4e2d\uff09\u3002<\/p>\n<p>MySQL \u7684 InnoDB \u5c31\u662f\u91c7\u7528\u4e86 B+ \u6811\u4f5c\u4e3a\u9ed8\u8ba4\u7684\u7d22\u5f15\u7b97\u6cd5\uff0c\u524d\u9762\u6211\u4eec\u8bf4\u4e86\uff0cB+\u6811\u53ea\u5728\u53f6\u5b50\u8282\u70b9\u5b58\u50a8\u6570\u636e\uff0c\u4f46\u662f\u8fd9\u4e2a\u53f6\u5b50\u8282\u70b9\u5b58\u50a8\u7684\u662f\u4ec0\u4e48\u6570\u636e\u5462? \u6211\u4eec\u6839\u636e\u53f6\u5b50\u5b58\u50a8\u6570\u636e\u7c7b\u578b\u7684\u4e0d\u540c\u5206\u4e3a\u4e24\u79cd\u7d22\u5f15<\/p>\n<ul>\n<li>\u4e3b\u952e\u7d22\u5f15\uff0c\u4e5f\u6210\u4e3a\u805a\u7c07\u7d22\u5f15\uff08Clustered index\uff09\uff0c\u5728\u53f6\u5b50\u8282\u70b9\u5b58\u50a8\u7684\u662f\u6574\u884c\u6570\u636e<\/li>\n<li>\u975e\u4e3b\u952e\u7d22\u5f15\uff0c\u4e5f\u6210\u4e3a\u4e8c\u7ea7\u7d22\u5f15\uff08Secondary index\uff09\uff0c\u53f6\u5b50\u8282\u70b9\u5b58\u50a8\u7684\u662f\u4e3b\u952e\u7684\u503c<\/li>\n<\/ul>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042912726\" alt=\"image-20210326115557786\" title=\"image-20210326115557786\" loading=\"lazy\"><\/p>\n<p>\u6b63\u56e0\u4e3a\u5728 InnoDB \u4e2d\uff0c\u6211\u4eec\u7684\u6570\u636e\u4e5f\u662f\u5b58\u50a8\u5728\u4e00\u4e2a\u7d22\u5f15\uff08\u4e3b\u952e\u7d22\u5f15\uff09\u91cc\u7684\uff0c\u56e0\u6b64\uff0c\u6211\u4eec\u79f0 InnoDB \u662f\u7d22\u5f15\u7ec4\u7ec7\u8868\u3002\u4e8c\u7ea7\u7d22\u5f15\u5b58\u50a8\u7684\u662f\u6570\u636e\u7684\u4e3b\u952e\uff0c\u5f53\u6211\u4eec\u4f7f\u7528\u4e8c\u7ea7\u7d22\u5f15\u67e5\u8be2\u4e00\u6761\u6570\u636e\u7684\u65f6\u5019\uff0c\u9996\u5148\u4f1a\u4ece\u4e8c\u7ea7\u7d22\u5f15\u4e2d\u67e5\u8be2\u5230\u8fd9\u6761\u8bb0\u5f55\u7684 ID\uff0c\u7136\u540e\u62ff\u8fd9\u4e2a ID \u53bb\u4e3b\u952e\u7d22\u5f15\u67e5\u8be2\u771f\u6b63\u7684\u6570\u636e\uff0c\u6211\u4eec\u79f0\u8fd9\u4e2a\u8fc7\u7a0b\u4e3a \u56de\u8868\u3002<\/p>\n<blockquote>\n<p>\u56e0\u4e3a\u4e8c\u7ea7\u7d22\u5f15\u5b58\u50a8\u7684\u662f\u4e3b\u952e\u7684 ID\uff0c\u56e0\u6b64\u901a\u5e38\u6211\u4eec\u4f1a\u9009\u62e9 integer \u6216\u8005 bigint \u7b49\u6574\u578b\u7c7b\u578b\u4f5c\u4e3a\u4e3b\u952e\uff0c\u8fd9\u6837\u505a\u7684\u76ee\u7684\u662f\u53ef\u4ee5\u51cf\u5c11\u4e8c\u7ea7\u7d22\u5f15\u5360\u7528\u7a7a\u95f4\u7684\u5927\u5c0f\u3002\u5982\u679c\u7528\u5b57\u7b26\u4e32\u4f5c\u4e3a\u4e3b\u952e\uff0c\u53ef\u60f3\u53ef\u77e5\u4e8c\u7ea7\u7d22\u5f15\u4f1a\u6709\u591a\u5927\uff01<\/p>\n<p>\u9664\u4e86\u4e0a\u9762\u8fd9\u4e2a\u5916\uff0c\u901a\u5e38\u8981\u6c42\u4e3b\u952e\u4e00\u5b9a\u662f\u8981\u81ea\u589e\u7684\uff0c\u8fd9\u6837\u505a\u662f\u4e3a\u4e86\u4fdd\u8bc1\u4e3b\u952e\u7684\u6709\u5e8f\uff0c\u6bcf\u6b21\u63d2\u5165\u6570\u636e\u90fd\u662f\u8ffd\u52a0\u5230 B+ \u6811\uff0c\u907f\u514d\u9875\u5206\u88c2\uff08\u5982\u679c\u6570\u636e\u9875\u6ee1\u4e86\uff0c\u5219\u9700\u8981\u7533\u8bf7\u65b0\u7684\u6570\u636e\u9875\uff0c\u7136\u540e\u632a\u52a8\u90e8\u5206\u6570\u636e\u8fc7\u53bb\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u53eb\u505a \u9875\u5206\u88c2\uff09\u7684\u4ea7\u751f\uff0c\u63d0\u9ad8\u6570\u636e\u5199\u5165\u6027\u80fd\u3002<\/p>\n<\/blockquote>\n<p>\u4ece\u4e0a\u9762\u8bb2\u7684\u8fd9\u4e9b\uff0c\u6211\u4eec\u53ef\u4ee5\u60f3\u5230\u4e0b\u9762\u51e0\u4e2a\u4f18\u5316\u7d22\u5f15\u7684\u6280\u5de7<\/p>\n<ul>\n<li>\u7d22\u5f15\u5e94\u8be5\u5c3d\u53ef\u80fd\u5c0f\uff0c\u8fd9\u6837\u4e00\u6b21\u78c1\u76d8\u8bfb\u53d6\u53ef\u4ee5\u8fd4\u56de\u5c3d\u53ef\u80fd\u591a\u7684\u7d22\u5f15\u6570\u636e\uff0c\u5728\u67e5\u8be2\u6570\u636e\u65f6\u5c31\u53ef\u4ee5\u51cf\u5c11\u78c1\u76d8 IO<\/li>\n<li>\u5927\u8868\u67e5\u8be2\u5c3d\u53ef\u80fd\u7684\u4f7f\u7528\u7d22\u5f15\uff0c\u4e0d\u4f7f\u7528\u7d22\u5f15\u5c31\u4f1a\u9020\u6210\u5168\u8868\u626b\u63cf\uff0c\u60f3\u60f3\u4e00\u4e2a\u67e5\u8be2\uff0c\u9700\u8981\u904d\u5386\u51e0\u767e\u4e07\u6570\u636e\uff0c\u8bfb\u53d6\u6210\u5343\u4e0a\u767e\u6b21\u78c1\u76d8\u4f1a\u6709\u591a\u6162<\/li>\n<li>\u5982\u679c\u53ef\u80fd\uff0c\u5c3d\u91cf\u4f7f\u7528\u4e3b\u952e\u7d22\u5f15\u8fdb\u884c\u67e5\u8be2\uff0c\u4f7f\u7528\u4e3b\u952e\u7d22\u5f15\u53ef\u4ee5\u76f4\u63a5\u89e6\u8fbe\u6570\u636e\uff0c\u4e0d\u9700\u8981\u6267\u884c\u56de\u8868\uff0c\u51cf\u5c11\u78c1\u76d8 IO<\/li>\n<li>\u5982\u679c\u7d22\u5f15\u4e2d\u5305\u542b\u4e86\u6211\u4eec\u8981\u67e5\u8be2\u7684\u6240\u6709\u5b57\u6bb5\uff0c\u90a3\u5c31\u4e0d\u9700\u8981\u5728\u8fdb\u884c\u56de\u8868\uff0c\u53ef\u4ee5\u51cf\u5c11\u78c1\u76d8 IO\uff0c\u663e\u8457\u63d0\u5347\u67e5\u8be2\u6027\u80fd\uff0c\u6211\u4eec\u628a\u8fd9\u79cd\u67e5\u8be2\u6570\u636e\u90fd\u5728\u7d22\u5f15\u91cc\u9762\u7684\u60c5\u51b5\u53eb\u505a\u8986\u76d6\u7d22\u5f15<\/li>\n<\/ul>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u8fd9\u6b21\u5206\u4eab\u4e2d\uff0c\u6211\u4eec\u5148\u7b80\u5355\u4ecb\u7ecd\u4e86\u4e0b\u4e24\u79cd\u7b80\u5355\u7684\u7d22\u5f15\u7ed3\u6784\uff0c\u7136\u540e\u4ece\u6570\u636e\u5728\u78c1\u76d8\u7684\u5b58\u50a8\u8bf4\u8d77\uff0c\u4ece\u6ca1\u6709\u7d22\u5f15\u5230\u5efa\u7acb\u591a\u7ea7\u7d22\u5f15\uff0c\u89e3\u91ca\u4e86\u4e3a\u4ec0\u4e48\u4f1a\u51fa\u73b0\u6811\u7d22\u5f15\u4ee5\u53caB\u6811\u7d22\u5f15\u548c B+\u6811\u7d22\u5f15\uff0c\u6700\u540e\u6211\u4eec\u4ecb\u7ecd\u4e86\u4e0b InnoDB \u4e2d\u5173\u4e8e\u4e3b\u952e\u7d22\u5f15\u548c\u4e8c\u7ea7\u7d22\u5f15\u7684\u6982\u5ff5\u548c\u51e0\u4e2a\u4f18\u5316\u7d22\u5f15\u7684\u6280\u5de7\u3002<\/p>\n<p>\u672c\u6587\u5c06\u4f1a\u6301\u7eed\u4fee\u6b63\u548c\u66f4\u65b0\uff0c\u6700\u65b0\u5185\u5bb9\u8bf7\u53c2\u8003\u6211\u7684 <a href=\"https:\/\/link.segmentfault.com\/?enc=B2z9iKnQI2rsejc0kZoLJQ%3D%3D.inadKqfO86Iqm8BMPq9a1aFh29Pk4MAJRNdTc11YIfo%3D\" rel=\"nofollow\">GITHUB<\/a> \u4e0a\u7684 <a href=\"https:\/\/link.segmentfault.com\/?enc=%2FQSjZ9Kfx9LYy5ugt%2FxIOw%3D%3D.t17fhrDBI%2Fv%2BTcDtuKXOkYAeyKGLhztZTz7glyiKQ%2FEovNhCrNxJNb9JJFDybEP%2B\" rel=\"nofollow\">\u7a0b\u5e8f\u733f\u6210\u957f\u8ba1\u5212<\/a> \u9879\u76ee\uff0c\u6b22\u8fce Star\uff0c\u66f4\u591a\u7cbe\u5f69\u5185\u5bb9\u8bf7 <a href=\"https:\/\/link.segmentfault.com\/?enc=iIMOhv8EKFHOpmhvhcKxDQ%3D%3D.teqFsnbLiiGRXGy4mtIXdQxKjDxo6noOFb3OIn1zkE0%3D\" rel=\"nofollow\">follow me<\/a>\u3002<\/p>\n<hr>\n<ul>\n<li><a href=\"https:\/\/link.segmentfault.com\/?enc=9U7zhKWQmo261Q7e50lZbA%3D%3D.S2a%2FKLUAqMYCBuPJ4kAXkYNrW6%2B7SI6yK%2FVcAB7DdSzjy1LrRZYd90ptYc%2FwHapuBICv9zgf2mTm536tbzg4Eg%3D%3D\" rel=\"nofollow\">https:\/\/blog.csdn.net\/yin7678&#8230;<\/a><\/li>\n<li><a href=\"https:\/\/link.segmentfault.com\/?enc=cBgmI3WaJ3lztUbqLfFsEw%3D%3D.DooM0T4ikPBE2phXZkCv1jHvgrNwoEXMgJvLoO1AhBlOB3ha%2Fq9zeI5a5c4RngHz\" rel=\"nofollow\">https:\/\/time.geekbang.org\/col&#8230;<\/a><\/li>\n<li><a href=\"https:\/\/link.segmentfault.com\/?enc=PzWwYhvW%2FZYzXWqlRe27Eg%3D%3D.JHtHvIFFjWI69m6ObDmR06OuhSUhPgWLDlwEI0zDxYmPiCcywlGGo96d7d3dbTqBrRv42zo8rNgsyo1%2FJdqEgx1jqd%2BtSFezeblUff7w74O2Ag40UU29QCsvHf%2Fq9ydB\" rel=\"nofollow\">https:\/\/www.codeproject.com\/A&#8230;<\/a><\/li>\n<\/ul>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000042912711\">https:\/\/segmentfault.com\/a\/1190000042912711<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6982\u8ff0 \u4ec0\u4e48\u662f\u7d22\u5f15 \u4e00\u672c\u4e66 500 \u9875\u7684\u4e66\uff0c\u5982\u679c\u6ca1\u6709\u76ee\u5f55\uff0c\u76f4\u63a5\u53bb\u627e\u67d0\u4e2a\u77e5\u8bc6\u70b9\uff0c\u53ef\u80fd\u9700\u8981\u627e\u4e00\u4f1a\u513f\uff0c\u4f46\u662f\u501f\u52a9\u524d\u9762\u7684\u76ee [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10006919","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006919","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10006919"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006919\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10006919"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10006919"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10006919"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}