{"id":899,"date":"2025-03-22T14:25:46","date_gmt":"2025-03-22T06:25:46","guid":{"rendered":"https:\/\/eve2333.top\/?p=899"},"modified":"2025-03-22T14:25:46","modified_gmt":"2025-03-22T06:25:46","slug":"mysql%e6%95%b0%e6%8d%ae%e5%ba%93%e5%85%a5%e9%97%a8%e5%88%b0%e5%a4%a7%e8%9b%87%e5%b0%9a%e7%a1%85%e8%b0%b7%e5%ae%8b%e7%ba%a2%e5%ba%b7%e8%80%81%e5%b8%88%e7%ac%94%e8%ae%b0-%e9%ab%98%e7%ba%a7%e7%af%87-pa-6","status":"publish","type":"post","link":"https:\/\/eve2333.top\/?p=899","title":{"rendered":"MySQL\u6570\u636e\u5e93\u5165\u95e8\u5230\u5927\u86c7\u5c1a\u7845\u8c37\u5b8b\u7ea2\u5eb7\u8001\u5e08\u7b14\u8bb0 \u9ad8\u7ea7\u7bc7 part 6"},"content":{"rendered":"\n

 \u4ece6\u523012\u7ae0\u5c06\u4f1a\u662f\u91cd\u4e2d\u4e4b\u91cd,\u8bf7\u4e00\u5b9a\u597d\u597d\u770b<\/p>\n\n\n\n

\u7b2c06\u7ae0_\u7d22\u5f15\u7684\u6570\u636e\u7ed3\u6784<\/h1>\n\n\n\n

1.\u4e3a\u4ec0\u4e48\u4f7f\u7528\u7d22\u5f15<\/h2>\n\n\n\n

\u7d22\u5f15\u662f\u5b58\u50a8\u5f15\u64ce\u7528\u4e8e\u5feb\u901f\u627e\u5230\u6570\u636e\u8bb0\u5f55\u7684\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u5c31\u597d\u6bd4\u4e00\u672c\u6559\u8bfe\u4e66\u7684\u76ee\u5f55\u90e8\u5206\uff0c\u901a\u8fc7\u76ee\u5f55\u4e2d\u627e\u5230\u5bf9\u5e94\u6587\u7ae0\u7684\u9875\u7801\uff0c\u4fbf\u53ef\u5feb\u901f\u5b9a\u4f4d\u5230\u9700\u8981\u7684\u6587\u7ae0\u3002MySQL\u4e2d\u4e5f\u662f\u4e00\u6837\u7684\u9053\u7406\uff0c\u8fdb\u884c\u6570\u636e\u67e5\u627e\u65f6\uff0c\u9996\u5148\u67e5\u770b\u67e5\u8be2\u6761\u4ef6\u662f\u5426\u547d\u4e2d\u67d0\u6761\u7d22\u5f15\uff0c\u7b26\u5408\u5219\u901a\u8fc7\u7d22\u5f15\u67e5\u627e\u76f8\u5173\u6570\u636e\uff0c\u5982\u679c\u4e0d\u7b26\u5408\u5219\u9700\u8981\u5168\u8868\u626b\u63cf<\/strong>\uff0c\u5373\u9700\u8981\u4e00\u6761\u4e00\u6761\u5730\u67e5\u627e\u8bb0\u5f55\uff0c\u76f4\u5230\u627e\u5230\u4e0e\u6761\u4ef6\u7b26\u5408\u7684\u8bb0\u5f55\u3002<\/p>\n\n\n\n

\u5047\u5982\u7ed9\u6570\u636e\u4f7f\u7528\u4e8c\u53c9\u641c\u7d22\u6811<\/strong>\u8fd9\u6837\u7684\u6570\u636e\u7ed3\u6784\u8fdb\u884c\u5b58\u50a8\uff0c\u5982\u4e0b\u56fe\u6240\u793a,\u65f6\u95f4\u590d\u6742\u5ea6\u8fbe\u5230O(log2n) \u6bd4\u6211\u4eec\u7684O(N)\u66f4\u597d\u4e00\u4e9b .(\u8fd9\u4e2a\u5bb9\u6613\u503e\u659c\uff0c\u6240\u4ee5\u6709\u4e86AVG\uff0c\u56e0\u4e3aAVG\u9700\u8981\u9891\u7e41\u8c03\u6574\u6811\u5f62\uff0c\u6240\u4ee5\u624d\u6709\u4e86\u7ea2\u9ed1\u6811)<\/p>\n\n\n\n

\"\"\u8fd9\u5c31\u662f\u6211\u4eec\u4e3a\u4ec0\u4e48\u8981\u5efa\u7d22\u5f15\uff0c\u76ee\u7684\u5c31\u662f\u4e3a\u4e86\u51cf\u5c11\u78c1\u76d8I\/0\u7684\u6b21\u6570\uff0c\u52a0\u5feb\u67e5\u8be2\u901f\u7387\u3002<\/p>\n\n\n\n

 2.\u7d22\u5f15\u53ca\u5176\u4f18\u7f3a\u70b9<\/h2>\n\n\n\n

2.1\u7d22\u5f15\u6982\u8ff0<\/h3>\n\n\n\n

MySQL\u5b98\u65b9\u5bf9\u7d22\u5f15\u7684\u5b9a\u4e49\u4e3a\uff1a\u7d22\u5f15\uff08Index<\/strong>\uff09\u662f<\/strong>\u5e2e\u52a9MySQL\u9ad8\u6548\u83b7\u53d6\u6570\u636e\u7684\u6570\u636e\u7ed3\u6784\u3002<\/strong><\/p>\n\n\n\n

\u7d22\u5f15\u7684\u672c\u8d28\uff1a\u7d22\u5f15\u662f\u6570\u636e\u7ed3\u6784\u3002\u4f60\u53ef\u4ee5\u7b80\u5355\u7406\u89e3\u4e3a\u201c\u6392\u597d\u5e8f\u7684\u5feb\u901f\u67e5\u627e\u6570\u636e\u7ed3\u6784\u201d\uff0c\u6ee1\u8db3\u7279\u5b9a\u67e5\u627e\u7b97\u6cd5\u3002\u8fd9\u4e9b\u6570\u636e\u7ed3\u6784\u4ee5\u67d0\u79cd\u65b9\u5f0f\u6307\u5411\u6570\u636e\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u5728\u8fd9\u4e9b\u6570\u636e\u7ed3\u6784\u7684\u57fa\u7840\u4e0a\u5b9e\u73b0\u9ad8\u7ea7\u67e5\u627e\u7b97\u6cd5\u3002<\/p>\n\n\n\n

\u7d22\u5f15\u662f\u5728\u5b58\u50a8\u5f15\u64ce\u4e2d\u5b9e\u73b0\u7684\uff0c\u56e0\u6b64\u6bcf\u79cd\u5b58\u50a8\u5f15\u64ce\u7684\u7d22\u5f15\u4e0d\u4e00\u5b9a\u5b8c\u5168\u76f8\u540c\uff0c\u5e76\u4e14\u6bcf\u79cd\u5b58\u50a8\u5f15\u64ce\u4e0d\u4e00\u5b9a\u652f\u6301\u6240\u6709\u7d22\u5f15\u7c7b\u578b\u3002\u540c\u65f6\uff0c\u5b58\u50a8\u5f15\u64ce\u53ef\u4ee5\u5b9a\u4e49\u6bcf\u4e2a\u8868\u7684\u6700\u5927\u7d22\u5f15\u6570\u548c\u6700\u5927\u7d22\u5f15\u957f\u5ea6\u3002\u6240\u6709\u5b58\u50a8\u5f15\u64ce\u652f\u6301\u6bcf\u4e2a\u8868\u81f3\u5c1116\u4e2a\u7d22\u5f15\uff0c\u603b\u7d22\u5f15\u957f\u5ea6\u81f3\u5c11\u4e3a256\u5b57\u8282\u3002\u6709\u4e9b\u5b58\u50a8\u5f15\u64ce\u652f\u6301\u66f4\u591a\u7684\u7d22\u5f15\u6570\u548c\u66f4\u5927\u7684\u7d22\u5f15\u957f\u5ea6\u3002<\/p>\n\n\n\n

2.2\u4f18\u70b9<\/h3>\n\n\n\n

(1\uff09\u7c7b\u4f3c\u5927\u5b66\u56fe\u4e66\u9986\u5efa\u4e66\u76ee\u7d22\u5f15\uff0c\u63d0\u9ad8\u6570\u636e\u68c0\u7d22\u7684\u6548\u7387\uff0c\u964d\u4f4e\u6570\u636e\u5e93\u7684IO\u6210\u672c<\/strong>\uff0c\u8fd9\u4e5f\u662f\u521b\u5efa\u7d22\u5f15\u6700\u4e3b\u8981\u7684\u539f\u56e0\u3002
(2\uff09\u901a\u8fc7\u521b\u5efa\u552f\u4e00\u7d22\u5f15\uff0c\u53ef\u4ee5\u4fdd\u8bc1\u6570\u636e\u5e93\u8868\u4e2d\u6bcf\u4e00\u884c\u6570\u636e\u7684\u552f\u4e00\u6027(\u552f\u4e00\u7ea6\u675f)\u3002<\/strong>
(3\uff09\u5728\u5b9e\u73b0\u6570\u636e\u7684\u53c2\u8003\u5b8c\u6574\u6027\u65b9\u9762\uff0c\u53ef\u4ee5\u52a0\u901f\u8868\u548c\u8868\u4e4b\u95f4\u7684\u8fde\u63a5\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u5bf9\u4e8e\u6709\u4f9d\u8d56\u5173\u7cfb\u7684\u5b50\u8868\u548c\u7236\u8868\u8054\u5408\u67e5\u8be2\u65f6\uff0c\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8be2\u901f\u5ea6\u3002
(4)   \u5728\u4f7f\u7528\u5206\u7ec4\u548c\u6392\u5e8f\u5b50\u53e5\u8fdb\u884c\u6570\u636e\u67e5\u8be2\u65f6\uff0c\u53ef\u4ee5\u663e\u8457\u51cf\u5c11\u67e5\u8be2\u4e2d\u5206\u7ec4\u548c\u6392\u5e8f\u7684\u65f6\u95f4\uff0c\u964d\u4f4e\u4e86CPU\u7684\u6d88\u8017\u3002<\/p>\n\n\n\n

2.3\u7f3a\u70b9<\/h3>\n\n\n\n

\u589e\u52a0\u7d22\u5f15\u4e5f\u6709\u8bb8\u591a\u4e0d\u5229\u7684\u65b9\u9762\uff0c\u4e3b\u8981\u8868\u73b0\u5728\u5982\u4e0b\u51e0\u4e2a\u65b9\u9762\uff1a
(1\uff09\u521b\u5efa\u7d22\u5f15\u548c\u7ef4\u62a4\u7d22\u5f15\u8981\u8017\u8d39\u65f6\u95f4\uff0c\u5e76\u4e14\u968f\u7740\u6570\u636e\u91cf\u7684\u589e\u52a0\uff0c\u6240\u8017\u8d39\u7684\u65f6\u95f4\u4e5f\u4f1a\u589e\u52a0\u3002
(2\uff09\u7d22\u5f15\u9700\u8981\u5360\u78c1\u76d8\u7a7a\u95f4\uff0c\u9664\u4e86\u6570\u636e\u8868\u5360\u6570\u636e\u7a7a\u95f4\u4e4b\u5916\uff0c\u6bcf\u4e00\u4e2a\u7d22\u5f15\u8fd8\u8981\u5360\u4e00\u5b9a\u7684\u7269\u7406\u7a7a\u95f4\uff0c\u5b58\u50a8\u5728\u78c1\u76d8\u4e0a\uff0c\u5982\u679c\u6709\u5927\u91cf\u7684\u7d22\u5f15\uff0c\u7d22\u5f15\u6587\u4ef6\u5c31\u53ef\u80fd\u6bd4\u6570\u636e\u6587\u4ef6\u66f4\u5feb\u8fbe\u5230\u6700\u5927\u6587\u4ef6\u5c3a\u5bf8\u3002
(3\uff09\u867d\u7136\u7d22\u5f15\u5927\u5927\u63d0\u9ad8\u4e86\u67e5\u8be2\u901f\u5ea6\uff0c\u540c\u65f6\u5374\u4f1a\u964d\u4f4e\u66f4\u65b0\u8868\u7684\u901f\u5ea6\u3002\u5f53\u5bf9\u8868\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u589e\u52a0\u3001\u5220\u9664\u548c\u4fee\u6539\u7684\u65f6\u5019\uff0c\u7d22\u5f15\u4e5f\u8981\u52a8\u6001\u5730\u7ef4\u62a4\uff0c\u8fd9\u6837\u5c31\u964d\u4f4e\u4e86\u6570\u636e\u7684\u7ef4\u62a4\u901f\u5ea6\u3002<\/p>\n\n\n\n

\n

\u56e0\u6b64\uff0c\u9009\u62e9\u4f7f\u7528\u7d22\u5f15\u65f6\uff0c\u9700\u8981\u7efc\u5408\u8003\u8651\u7d22\u5f15\u7684\u4f18\u70b9\u548c\u7f3a\u70b9\u3002
\u63d0\u793a\uff1a
\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8be2\u7684\u901f\u5ea6\uff0c\u4f46\u662f\u4f1a\u5f71\u54cd\u63d2\u5165\u8bb0\u5f55\u7684\u901f\u5ea6\u3002\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6700\u597d\u7684\u529e\u6cd5\u662f\u5148\u5220\u9664\u8868\u4e2d\u7684\u7d22\u5f15\uff0c\u7136\u540e\u63d2\u5165\u6570\u636e\uff0c\u63d2\u5165\u5b8c\u6210\u540e\u518d\u521b\u5efa\u7d22\u5f15\u3002<\/p>\n<\/blockquote>\n\n\n\n

3.InnoDB\u4e2d\u7d22\u5f15\u7684\u63a8\u6f14<\/h2>\n\n\n\n

3.1\u7d22\u5f15\u4e4b\u524d\u7684\u67e5\u627e<\/h3>\n\n\n\n

\u5148\u6765\u770b\u4e00\u4e2a\u7cbe\u786e\u5339\u914d\u7684\u4f8b\u5b50\uff1a<\/p>\n\n\n\n

SELECT [\u5217\u540d\u5217\u8868] FROM \u8868\u540d WHERE \u5217\u540d=XXX;<\/code><\/pre>\n\n\n\n
\u5047\u8bbe\u76ee\u524d\u8868\u4e2d\u7684\u8bb0\u5f55\u6bd4\u8f83\u5c11\uff0c\u6240\u6709\u7684\u8bb0\u5f55\u90fd\u53ef\u4ee5\u88ab\u5b58\u653e\u5230\u4e00\u4e2a\u9875\u4e2d\uff0c\u5728\u67e5\u627e\u8bb0\u5f55\u7684\u65f6\u5019\u53ef\u4ee5\u6839\u636e\u641c\u7d22\u6761\u4ef6\u7684\u4e0d\u540c\u5206\u4e3a\u4e24\u79cd\u60c5\u51b5\uff1a
1. \u4ee5\u4e3b\u952e\u4e3a\u641c\u7d22\u6761\u4ef6
\u7531\u4e8e\u5979\u6709\u987a\u5e8f , \u53ef\u4ee5\u5728\u9875\u76ee\u5f55\u4e2d\u4f7f\u7528\u4e8c\u5206\u6cd5\u5feb\u901f\u5b9a\u4f4d\u5230\u5bf9\u5e94\u7684\u69fd\uff0c\u7136\u540e\u518d\u904d\u5386\u8be5\u69fd\u5bf9\u5e94\u5206\u7ec4\u4e2d\u7684\u8bb0\u5f55\u5373\u53ef\u5feb\u901f\u627e\u5230\u6307\u5b9a\u7684\u8bb0\u5f55\u3002
2. \u4ee5\u5176\u4ed6\u5217\u4f5c\u4e3a\u641c\u7d22\u6761\u4ef6
\u56e0\u4e3a\u5728\u6570\u636e\u9875\u4e2d\u5e76\u6ca1\u6709\u5bf9\u975e\u4e3b\u952e\u5217\u5efa\u7acb\u6240\u8c13\u7684\u9875\u76ee\u5f55\uff0c\u6240\u4ee5\u6211\u4eec\u65e0\u6cd5\u901a\u8fc7\u4e8c\u5206\u6cd5\u5feb\u901f\u5b9a\u4f4d\u76f8\u5e94\u7684\u69fd\u3002\u8fd9\u79cd\u60c5\u51b5\u4e0b\u53ea\u80fd\u4ece\u6700\u5c0f\u8bb0\u5f55\u5f00\u59cb\u4f9d\u6b21\u904d\u5386\u5355\u94fe\u8868\u4e2d\u7684\u6bcf\u6761\u8bb0\u5f55\uff0c\u7136\u540e\u5bf9\u6bd4\u6bcf\u6761\u8bb0\u5f55\u662f\u4e0d\u662f\u7b26\u5408\u641c\u7d22\u6761\u4ef6\u3002\u5f88\u663e\u7136\uff0c\u8fd9\u79cd\u67e5\u627e\u7684\u6548\u7387\u662f\u975e\u5e38\u4f4e\u7684\u3002<\/p>\n\n\n\n
2.\u5728\u5f88\u591a\u9875\u4e2d\u67e5\u627e<\/p>\n\n\n\n
\u5927\u90e8\u5206\u60c5\u51b5\u4e0b\u6211\u4eec\u8868\u4e2d\u5b58\u653e\u7684\u8bb0\u5f55\u90fd\u662f\u975e\u5e38\u591a\u7684\uff0c\u9700\u8981\u597d\u591a\u7684\u6570\u636e\u9875\u6765\u5b58\u50a8\u8fd9\u4e9b\u8bb0\u5f55\u3002\u5728\u5f88\u591a\u9875\u4e2d\u67e5\u627e\u8bb0\u5f55\u7684\u8bdd , \u53ef\u4ee5\u5206\u4e3a\u4e24\u4e2a\u6b65\u9aa4\uff1a
1\uff0e\u5b9a\u4f4d\u5230\u8bb0\u5f55\u6240\u5728\u7684\u9875\u3002
2.   \u4ece\u6240\u5728\u7684\u9875\u5185\u4e2d\u67e5\u627e\u76f8\u5e94\u7684\u8bb0\u5f55\u3002<\/p>\n\n\n\n
\u5728\u6ca1\u6709\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\uff0c\u4e0d\u8bba\u662f\u6839\u636e\u4e3b\u952e\u5217\u6216\u8005\u5176\u4ed6\u5217\u7684\u503c\u8fdb\u884c\u67e5\u627e\uff0c\u7531\u4e8e\u6211\u4eec\u5e76\u4e0d\u80fd\u5feb\u901f\u7684\u5b9a\u4f4d\u5230\u8bb0\u5f55\u6240\u5728\u7684\u9875\uff0c\u6240\u4ee5\u53ea\u80fd\u4ece\u7b2c\u4e00\u4e2a\u9875\u6cbf\u7740\u53cc\u5411\u94fe\u8868\u4e00\u76f4\u5f80\u4e0b\u627e\uff0c\u5728\u6bcf\u4e00\u4e2a\u9875\u4e2d\u6839\u636e\u6211\u4eec\u4e0a\u9762\u7684\u67e5\u627e\u65b9\u5f0f\u53bb\u67e5\u627e\u6307\u5b9a\u7684\u8bb0\u5f55\u3002\u56e0\u4e3a\u8981\u904d\u5386\u6240\u6709\u7684\u6570\u636e\u9875\uff0c\u6240\u4ee5\u8fd9\u79cd\u65b9\u5f0f\u663e\u7136\u662f\u8d85\u7ea7\u8017\u65f6\u7684\u3002\u5982\u679c\u4e00\u4e2a\u8868\u6709\u4e00\u4ebf\u6761\u8bb0\u5f55\u5462\uff1f\u6b64\u65f6\u7d22\u5f15\u5e94\u8fd0\u800c\u751f\u3002<\/p>\n\n\n\n
3.2\u8bbe\u8ba1\u7d22\u5f15<\/p>\n\n\n\n
\u5efa\u4e00\u4e2a\u8868\uff1a<\/p>\n\n\n\n
mysql> CREATE TABLE index_demo(\n    ->    C1 INT,\n    ->    C2 INT,\n    ->    C3 CHAR(1).\n    ->    PRIMARY KEY(c1)\n    -> ) ROW_FORMAT=Compact;<\/code><\/pre>\n\n\n\n
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    mysql>INSERT INTO index_demo VALUES(1,4,'u')\uff0c(3,9,'d'),(5,3,'y');\nQuery 0K, 3 rows affected (0.01 sec)\nRecords:3  Duplicates:0  Warnings:0<\/code><\/pre>\n\n\n\n
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       \u4e00\u4e2aB+\u6811\u7684\u8282\u70b9\u5176\u5b9e\u53ef\u4ee5\u5206\u6210\u597d\u591a\u5c42\uff0c\u89c4\u5b9a\u6700\u4e0b\u8fb9\u7684\u90a3\u5c42\uff0c\u4e5f\u5c31\u662f\u5b58\u653e\u6211\u4eec\u7528\u6237\u8bb0\u5f55\u7684\u90a3\u5c42\u4e3a\u7b2c0\u5c42\uff0c\u4e4b\u540e\u4f9d\u6b21\u5f80\u4e0a\u52a0\u3002\u4e4b\u524d\u6211\u4eec\u505a\u4e86\u4e00\u4e2a\u975e\u5e38\u6781\u7aef\u7684\u5047\u8bbe\uff1a\u5b58\u653e\u7528\u6237\u8bb0\u5f55\u7684\u9875\u6700\u591a\u5b58\u653e3\u6761\u8bb0\u5f55\uff0c\u5b58\u653e\u76ee\u5f55\u9879\u8bb0\u5f55\u7684\u9875\u6700\u591a\u5b58\u653e4\u6761\u8bb0\u5f55\u3002\u5176\u5b9e\u771f\u5b9e\u73af\u5883\u4e2d\u4e00\u4e2a\u9875\u5b58\u653e\u7684\u8bb0\u5f55\u6570\u91cf\u662f\u975e\u5e38\u5927\u7684\uff0c\u5047\u8bbe\u6240\u6709\u5b58\u653e\u7528\u6237\u8bb0\u5f55\u7684\u53f6\u5b50\u8282\u70b9\u4ee3\u8868\u7684\u6570\u636e\u9875\u53ef\u4ee5\u5b58\u653e100\u6761\u7528\u6237\u8bb0\u5f55\uff0c\u6240\u6709\u5b58\u653e\u76ee\u5f55\u9879\u8bb0\u5f55\u7684\u5185\u8282\u70b9\u4ee3\u8868\u7684\u6570\u636e\u9875\u53ef\u4ee5\u5b58\u653e1000\u6761\u76ee\u5f55\u9879\u8bb0\u5f55\uff0c\u90a3\u4e48\uff1a
      \u00b7\u5982\u679cB+\u6811\u53ea\u67091\u5c42\uff0c\u4e5f\u5c31\u662f\u53ea\u67091\u4e2a\u7528\u4e8e\u5b58\u653e\u7528\u6237\u8bb0\u5f55\u7684\u8282\u70b9\uff0c\u6700\u591a\u80fd\u5b58\u653e100\u6761\u8bb0\u5f55\u3002
      \u00b7\u5982\u679cB+\u6811\u67092\u5c42\uff0c\u6700\u591a\u80fd\u5b58\u653e1000x100=10,0000\u6761\u8bb0\u5f55\u3002
      \u00b7\u5982\u679cB+\u6811\u67093\u5c42\uff0c\u6700\u591a\u80fd\u5b58\u653e1000x1000\u00d7100=1\uff0c0000\uff0c0000\u6761\u8bb0\u5f55\u3002
      \u00b7\u5982\u679cB+\u6811\u67094\u5c42\uff0c\u6700\u591a\u80fd\u5b58\u653e1000x1000x1000x100=1000,0000,0000\u6761\u8bb0\u5f55\u3002\u76f8\u5f53\u591a\u7684\u8bb0\u5f55\uff01\uff01\uff01
      \u4f60\u7684\u8868\u91cc\u80fd\u5b58\u653e100000000000\u6761\u8bb0\u5f55\u5417\uff1f\u6240\u4ee5\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u7528\u5230\u7684B+\u6811\u90fd\u4e0d\u4f1a\u8d85\u8fc74\u5c42\uff0c\u90a3\u6211\u4eec\u901a\u8fc7\u4e3b\u952e\u503c\u53bb\u67e5\u627e\u67d0\u6761\u8bb0\u5f55\u6700\u591a\u53ea\u9700\u8981\u505a4\u4e2a\u9875\u9762\u5185\u7684\u67e5\u627e\uff08\u67e5\u627e3\u4e2a\u76ee\u5f55\u9879\u9875\u548c\u4e00\u4e2a\u7528\u6237\u8bb0\u5f55\u9875\uff09\uff0c\u53c8\u56e0\u4e3a\u5728\u6bcf\u4e2a\u9875\u9762\u5185\u6709\u6240\u8c13\u7684PageDirectory\uff08\u9875\u76ee\u5f55\uff09\uff0c\u6240\u4ee5\u5728\u9875\u9762\u5185\u4e5f\u53ef\u4ee5\u901a\u8fc7\u4e8c\u5206\u6cd5\u5b9e\u73b0\u5feb\u901f\u5b9a\u4f4d\u8bb0\u5f55\u3002<\/p>\n\n\n\n
      \"\"<\/p>\n\n\n\n
       3.3\u5e38\u89c1\u7d22\u5f15\u6982\u5ff5<\/h3>\n\n\n\n
      \u7d22\u5f15\u6309\u7167\u7269\u7406\u5b9e\u73b0\u65b9\u5f0f\uff0c\u7d22\u5f15\u53ef\u4ee5\u5206\u4e3a2\u79cd\uff1a\u805a\u7c07\uff08\u805a\u96c6\uff09\u548c\u975e\u805a\u7c07\uff08\u975e\u805a\u96c6\uff09\u7d22\u5f15\u3002\u6211\u4eec\u4e5f\u628a\u975e\u805a\u96c6\u7d22\u5f15\u79f0\u4e3a\u4e8c\u7ea7\u7d22\u5f15\u6216\u8005\u8f85\u52a9\u7d22\u5f15\u3002<\/p>\n\n\n\n
      1.\u805a\u7c07\u7d22\u5f15<\/h4>\n\n\n\n
      \u805a\u7c07\u7d22\u5f15\u5e76\u4e0d\u662f\u4e00\u79cd\u5355\u72ec\u7684\u7d22\u5f15\u7c7b\u578b\uff0c\u800c\u662f\u4e00\u79cd\u6570\u636e\u5b58\u50a8\u65b9\u5f0f\uff08\u6240\u6709\u7684\u7528\u6237\u8bb0\u5f55\u90fd\u5b58\u50a8\u5728\u4e86\u53f6\u5b50\u8282\u70b9\uff09\uff0c\u4e5f\u5c31\u662f\u6240\u8c13\u7684\u7d22\u5f15\u5373\u6570\u636e\uff0c\u6570\u636e\u5373\u7d22\u5f15\u3002<\/strong><\/p>\n\n\n\n
      \u672f\u8bed\u201c\u805a\u7c07\u201c\u8868\u793a\u6570\u636e\u884c\u548c\u76f8\u90bb\u7684\u952e\u503c\u805a\u7c07\u7684\u5b58\u50a8\u5728\u4e00\u8d77\u3002<\/p>\n\n\n\n
      \u6211\u4eec\u56de\u5230B+\u6811\u4e2d,\u8fd9\u4e2a\u6700\u4e0b\u9762\u7684\u7b2c0\u5c42,\u5b9e\u6253\u5b9e\u7684\u6bcf\u4e00\u6761\u6570\u636e,\u57fa\u4e8e\u4e3b\u952e\u5347\u5e8f\u6392\u5217,\u53cc\u5411\u94fe\u8868\u6784\u6210\u4e86\u6240\u6709\u7684\u7b2c0\u5c42 ; \u4e0a\u5347\u5230\u76ee\u5f55\u9879\u548c\u76ee\u5f55\u9875\u7684\u7b2c\u4e00\u5c42 , \u81ea\u7136\u800c\u7136\u4e5f\u662f\u5347\u5e8f\u7684\u5173\u7cfb,\u5c31\u8fd9\u6837\u4e00\u6b65\u4e00\u6b65\u5f80\u4e0a\u5347\u548c\u62d3\u5c55.<\/p>\n\n\n\n
      1.\u4f7f\u7528\u8bb0\u5f55\u4e3b\u952e\u503c\u7684\u5927\u5c0f\u8fdb\u884c\u8bb0\u5f55\u548c\u9875\u7684\u6392\u5e8f\uff0c\u8fd9\u5305\u62ec\u4e09\u4e2a\u65b9\u9762\u7684\u542b\u4e49\uff1a
          \u9875\u5185\u7684\u8bb0\u5f55\u662f\u6309\u7167\u4e3b\u952e\u7684\u5927\u5c0f\u987a\u5e8f\u6392\u6210\u4e00\u4e2a\u5355\u5411\u94fe\u8868\u3002
          \u5404\u4e2a\u5b58\u653e\u7528\u6237\u8bb0\u5f55\u7684\u9875\u4e5f\u662f\u6839\u636e\u9875\u4e2d\u7528\u6237\u8bb0\u5f55\u7684\u4e3b\u952e\u5927\u5c0f\u987a\u5e8f\u6392\u6210\u4e00\u4e2a\u53cc\u5411\u94fe\u8868\u3002
          \u5b58\u653e\u76ee\u5f55\u9879\u8bb0\u5f55\u7684\u9875\u5206\u4e3a\u4e0d\u540c\u7684\u5c42\u6b21\uff0c\u5728\u540c\u4e00\u5c42\u6b21\u4e2d\u7684\u9875\u4e5f\u662f\u6839\u636e\u9875\u4e2d\u76ee\u5f55\u9879\u8bb0\u5f55\u7684\u4e3b\u952e\u5927\u5c0f\u987a\u5e8f\u6392\u6210\u4e00\u4e2a\u53cc\u5411\u94fe\u8868\u3002
      2.B+\u6811\u7684\u53f6\u5b50\u8282\u70b9\u5b58\u50a8\u7684\u662f\u5b8c\u6574\u7684\u7528\u6237\u8bb0\u5f55\u3002
      \u6240\u8c13\u5b8c\u6574\u7684\u7528\u6237\u8bb0\u5f55\uff0c\u5c31\u662f\u6307\u8fd9\u4e2a\u8bb0\u5f55\u4e2d\u5b58\u50a8\u4e86\u6240\u6709\u5217\u7684\u503c\uff08\u5305\u62ec\u9690\u85cf\u5217\uff09\u3002<\/p>\n\n\n\n
      \u6211\u4eec\u628a\u5177\u6709\u8fd9\u4e24\u79cd\u7279\u6027\u7684B+\u6811\u79f0\u4e3a\u805a\u7c07\u7d22\u5f15\uff0c\u6240\u6709\u5b8c\u6574\u7684\u7528\u6237\u8bb0\u5f55\u90fd\u5b58\u653e\u5728\u8fd9\u4e2a\u805a\u7c07\u7d22\u5f15\u7684\u53f6\u5b50\u8282\u70b9\u5904\u3002\u8fd9\u79cd\u805a\u7c07\u7d22\u5f15\u5e76\u4e0d\u9700\u8981\u6211\u4eec\u5728MySQL\u8bed\u53e5\u4e2d\u663e\u5f0f\u7684\u4f7f\u7528INDEX\u8bed\u53e5\u53bb\u521b\u5efa\uff0cInnoDB\u5b58\u50a8\u5f15\u64ce\u4f1a\u81ea\u52a8\u7684\u4e3a\u6211\u4eec\u521b\u5efa\u805a\u7c07\u7d22\u5f15\u3002<\/p>\n\n\n\n
      \u4f18\u70b9\uff1a
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      \u00b7\u6309\u7167\u805a\u7c07\u7d22\u5f15\u6392\u5217\u987a\u5e8f\uff0c\u67e5\u8be2\u663e\u793a\u4e00\u5b9a\u8303\u56f4\u6570\u636e\u7684\u65f6\u5019\uff0c\u7531\u4e8e\u6570\u636e\u90fd\u662f\u7d27\u5bc6\u76f8\u8fde\uff0c\u6570\u636e\u5e93\u4e0d\u7528\u4ece\u591a\u4e2a\u6570\u636e\u5757\u4e2d\u63d0\u53d6\u6570\u636e\uff0c\u6240\u4ee5\u8282\u7701\u4e86\u5927\u91cf\u7684io\u64cd\u4f5c<\/strong>\u3002<\/p>\n\n\n\n
      \u7f3a\u70b9\uff1a
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      \u66f4\u65b0\u4e3b\u952e\u7684\u4ee3\u4ef7\u5f88\u9ad8\uff0c\u56e0\u4e3a\u5c06\u4f1a\u5bfc\u81f4\u88ab\u66f4\u65b0\u7684\u884c\u79fb\u52a8\u3002\u56e0\u6b64\uff0c\u5bf9\u4e8eInnoDB\u8868\uff0c\u6211\u4eec\u4e00\u822c\u5b9a\u4e49\u4e3b\u952e\u4e3a\u4e0d\u53ef\u66f4\u65b0
      \u4e8c\u7ea7\u7d22\u5f15\u8bbf\u95ee\u9700\u8981\u4e24\u6b21\u7d22\u5f15\u67e5\u627e\uff0c\u7b2c\u4e00\u6b21\u627e\u5230\u4e3b\u952e\u503c\uff0c\u7b2c\u4e8c\u6b21\u6839\u636e\u4e3b\u952e\u503c\u627e\u5230\u884c\u6570\u636e<\/p>\n\n\n\n
      \n
      \u9650\u5236\uff1a
       \u00b7\u5bf9\u4e8eMySQL\u6570\u636e\u5e93\u76ee\u524d\u53ea\u6709InnoDB\u6570\u636e\u5f15\u64ce\u652f\u6301\u805a\u7c07\u7d22\u5f15\uff0c\u800cMyISAM\u5e76\u4e0d\u652f\u6301\u805a\u7c07\u7d22\u5f15\u3002
       \u00b7\u7531\u4e8e\u6570\u636e\u7269\u7406\u5b58\u50a8\u6392\u5e8f\u65b9\u5f0f\u53ea\u80fd\u6709\u4e00\u79cd\uff0c\u6240\u4ee5\u6bcf\u4e2aMySQL\u7684\u8868\u53ea\u80fd\u6709\u4e00\u4e2a\u805a\u7c07\u7d22\u5f15<\/strong>\u3002\u4e00\u822c\u60c5\u51b5\u4e0b\u5c31\u662f\u8be5\u8868\u7684\u4e3b\u952e\u3002
       \u00b7\u5982\u679c\u6ca1\u6709\u5b9a\u4e49\u4e3b\u952e\uff0cInnodb\u4f1a\u9009\u62e9\u975e\u7a7a\u7684\u552f\u4e00\u7d22\u5f15<\/strong>\u4ee3\u66ff\u3002\u5982\u679c\u6ca1\u6709\u8fd9\u6837\u7684\u7d22\u5f15\uff0cInnodb\u4f1a\u9690\u5f0f\u7684\u5b9a\u4e49\u4e00\u4e2a\u4e3b\u952e\u6765\u4f5c\u4e3a\u805a\u7c07\u7d22\u5f15\u3002
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      2.\u4e8c\u7ea7\u7d22\u5f15\uff08\u8f85\u52a9\u7d22\u5f15\u3001\u975e\u805a\u7c07\u7d22\u5f15\uff09<\/h4>\n\n\n\n
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      \"\"<\/p>\n\n\n\n
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      \"\"\"\"\"\"<\/p>\n\n\n\n
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      3.\u8054\u5408\u7d22\u5f15<\/h4>\n\n\n\n
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      \"\"<\/p>\n\n\n\n
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      3.4InnoDB\u7684B+\u6811\u7d22\u5f15\u7684\u6ce8\u610f\u4e8b\u9879<\/h3>\n\n\n\n
      1.\u6839\u9875\u9762\u4f4d\u7f6e\u4e07\u5e74\u4e0d\u52a8<\/h4>\n\n\n\n
        \u6211\u4eec\u524d\u8fb9\u4ecb\u7ecdB+\u6811\u7d22\u5f15\u7684\u65f6\u5019\uff0c\u4e3a\u4e86\u5927\u5bb6\u7406\u89e3\u4e0a\u7684\u65b9\u4fbf\uff0c\u5148\u628a\u5b58\u50a8\u7528\u6237\u8bb0\u5f55\u7684\u53f6\u5b50\u8282\u70b9\u90fd\u753b\u51fa\u6765\uff0c\u7136\u540e\u63a5\u7740\u753b\u5b58\u50a8\u76ee\u5f55\u9879\u8bb0\u5f55\u7684\u5185\u8282\u70b9\uff0c\u5b9e\u9645\u4e0aB+\u6811\u7684\u5f62\u6210\u8fc7\u7a0b\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n\n\n\n
        \n
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      • \u968f\u540e\u5411\u8868\u4e2d\u63d2\u5165\u7528\u6237\u8bb0\u5f55\u65f6\uff0c\u5148\u628a\u7528\u6237\u8bb0\u5f55\u5b58\u50a8\u5230\u8fd9\u4e2a\u6839\u8282\u70b9\u4e2d\u3002<\/li>\n\n\n\n
      • \u5f53\u6839\u8282\u70b9\u4e2d\u7684\u53ef\u7528\u7a7a\u95f4\u7528\u5b8c\u65f6\u7ee7\u7eed\u63d2\u5165\u8bb0\u5f55\uff0c\u6b64\u65f6\u4f1a\u5c06\u6839\u8282\u70b9\u4e2d\u7684\u6240\u6709\u8bb0\u5f55\u590d\u5236\u5230\u4e00\u4e2a\u65b0\u5206\u914d\u7684\u9875\uff0c\u6bd4\u5982\u9875a\u4e2d\uff0c\u7136\u540e\u5bf9\u8fd9\u4e2a\u65b0\u9875\u8fdb\u884c\u9875\u5206\u88c2\u7684\u64cd\u4f5c\uff0c\u5f97\u5230\u53e6\u4e00\u4e2a\u65b0\u9875\uff0c\u6bd4\u5982\u9875b\u3002\u8fd9\u65f6\u65b0\u63d2\u5165\u7684\u8bb0\u5f55\u6839\u636e\u952e\u503c\uff08\u4e5f\u5c31\u662f\u805a\u7c07\u7d22\u5f15\u4e2d\u7684\u4e3b\u952e\u503c\uff0c\u4e8c\u7ea7\u7d22\u5f15\u4e2d\u5bf9\u5e94\u7684\u7d22\u5f15\u5217\u7684\u503c\uff09\u7684\u5927\u5c0f\u5c31\u4f1a\u88ab\u5206\u914d\u5230\u9875a\u6216\u8005\u9875b\u4e2d\uff0c\u800c\u6839\u8282\u70b9\u4fbf\u5347\u7ea7\u4e3a\u5b58\u50a8\u76ee\u5f55\u9879\u8bb0\u5f55\u7684\u9875\u3002<\/li>\n<\/ul>\n\n\n\n
        \u8fd9\u4e2a\u8fc7\u7a0b\u7279\u522b\u6ce8\u610f\u7684\u662f\uff1a\u4e00\u4e2aB+\u6811\u7d22\u5f15\u7684\u6839\u8282\u70b9\u81ea\u8bde\u751f\u4e4b\u65e5\u8d77\uff0c\u4fbf\u4e0d\u4f1a\u518d\u79fb\u52a8\u3002\u8fd9\u6837\u53ea\u8981\u6211\u4eec\u5bf9\u67d0\u4e2a\u8868\u5efa\u7acb\u4e00\u4e2a\u7d22\u5f15\uff0c\u90a3\u4e48\u5b83\u7684\u6839\u8282\u70b9\u7684\u9875\u53f7\u4fbf\u4f1a\u88ab\u8bb0\u5f55\u5230\u67d0\u4e2a\u5730\u65b9\uff0c\u7136\u540e\u51e1\u662fInnoDB\u5b58\u50a8\u5f15\u64ce\u9700\u8981\u7528\u5230\u8fd9\u4e2a\u7d22\u5f15\u7684\u65f6\u5019\uff0c\u90fd\u4f1a\u4ece\u90a3\u4e2a\u56fa\u5b9a\u7684\u5730\u65b9\u53d6\u51fa\u6839\u8282\u70b9\u7684\u9875\u53f7\uff0c\u4ece\u800c\u6765\u8bbf\u95ee\u8fd9\u4e2a\u7d22\u5f15\u3002<\/p>\n\n\n\n
         2.\u5185\u8282\u70b9\u4e2d\u76ee\u5f55\u9879\u8bb0\u5f55\u7684\u552f\u4e00\u6027\uff08\u975e\u805a\u7c07\u7d22\u5f15\uff09<\/h4>\n\n\n\n
        \u6211\u4eec\u77e5\u9053B+\u6811\u7d22\u5f15\u7684\u5185\u8282\u70b9\u4e2d\u76ee\u5f55\u9879\u8bb0\u5f55\u7684\u5185\u5bb9\u662f\u7d22\u5f15\u5217+\u9875\u53f7\u7684\u642d\u914d\uff0c\u4f46\u662f\u8fd9\u4e2a\u642d\u914d\u5bf9\u4e8e\u4e8c\u7ea7\u7d22\u5f15\u6765\u8bf4\u6709\u70b9\u513f\u4e0d\u4e25\u8c28\u3002\u8fd8\u62ffindex_demo\u8868\u4e3a\u4f8b\uff0c\u5047\u8bbe\u8fd9\u4e2a\u8868\u4e2d\u7684\u6570\u636e\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n\n\n\n
        C1<\/td>C2<\/td>C3<\/td><\/tr>
        1<\/td>1<\/td>'u'<\/td><\/tr>
        3<\/td>1<\/td>'d'<\/td><\/tr>
        5<\/td>1<\/td>'y'<\/td><\/tr>
        7<\/td>1<\/td>'a'<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
        \"\"<\/p>\n\n\n\n
        \u5982\u679c\u6211\u4eec\u60f3\u65b0\u63d2\u5165\u4e00\u884c\u8bb0\u5f55\uff0c\u5176\u4e2d c1\u3001c2\u3001c3 \u7684\u503c\u5206\u522b\u662f\uff1a9\u30011\u3001'c'\uff0c\u90a3\u4e48\u5728\u4fee\u6539\u8fd9\u4e2a\u4e3a c2 \u5217\u5efa\u7acb\u7684\u4e8c\u7ea7\u7d22\u5f15\u5bf9\u5e94\u7684 B+ \u6811\u65f6\u4fbf\u78b0\u5230\u4e86 3 \u4e2a\u5927\u95ee\u9898\uff1a\u7531\u4e8e\u9875 3 \u4e2d\u5b58\u50a8\u7684\u76ee\u5f55\u9879\u8bb0\u5f55\u662f\u7531 c2 \u5217 + \u9875\u53f7\u7684\u503c\u6784\u6210\u7684\uff0c\u9875 3 \u4e2d\u7684\u4e24\u6761\u76ee\u5f55\u9879\u8bb0\u5f55\u5bf9\u5e94\u7684 c2 \u5217\u7684\u503c\u90fd\u662f 1\uff0c\u800c\u6211\u4eec\u65b0\u63d2\u5165\u7684\u8fd9\u6761\u8bb0\u5f55\u7684 c2 \u5217\u7684\u503c\u4e5f\u662f 1\uff0c\u90a3\u6211\u4eec\u8fd9\u6761\u65b0\u63d2\u5165\u7684\u8bb0\u5f55\u5230\u5e95\u5e94\u8be5\u653e\u5230\u9875 4 \u4e2d\uff0c\u8fd8\u662f\u5e94\u8be5\u653e\u5230\u9875 5 \u4e2d\u554a\uff1f\u7b54\u6848\u662f\uff1a\u5bf9\u4e0d\u8d77\uff0c\u61f5\u4e86\u3002<\/p>\n\n\n\n
        \u4e3a\u4e86\u8ba9\u65b0\u63d2\u5165\u8bb0\u5f55\u80fd\u627e\u5230\u81ea\u5df1\u5728\u90a3\u4e2a\u9875\u91cc\uff0c\u6211\u4eec\u9700\u8981\u4fdd\u8bc1\u5728 B+ \u6811\u7684\u540c\u4e00\u5c42\u5185\u8282\u70b9\u7684\u76ee\u5f55\u9879\u8bb0\u5f55\u9664\u9875\u53f7\u8fd9\u4e2a\u5b57\u6bb5\u4ee5\u5916\u662f\u552f\u4e00\u7684\u3002\u6240\u4ee5\u5bf9\u4e8e\u4e8c\u7ea7\u7d22\u5f15\u7684\u5185\u8282\u70b9\u7684\u76ee\u5f55\u9879\u8bb0\u5f55\u7684\u5185\u5bb9\u5b9e\u9645\u4e0a\u662f\u7531\u4e09\u4e2a\u90e8\u5206\u6784\u6210\u7684\uff1a<\/p>\n\n\n\n
        - \u7d22\u5f15\u5217\u7684\u503c
        - \u4e3b\u952e\u503c
        - \u9875\u53f7<\/p>\n\n\n\n
        \u4e5f\u5c31\u662f\u6211\u4eec\u628a\u4e3b\u952e\u503c\u4e5f\u6dfb\u52a0\u5230\u4e8c\u7ea7\u7d22\u5f15\u5185\u8282\u70b9\u4e2d\u7684\u76ee\u5f55\u9879\u8bb0\u5f55\u4e86\uff0c\u8fd9\u6837\u5c31\u80fd\u4fdd\u8bc1 B+ \u6811\u6bcf\u4e00\u5c42\u8282\u70b9\u4e2d\u5404\u6761\u76ee\u5f55\u9879\u8bb0\u5f55\u9664\u9875\u53f7\u8fd9\u4e2a\u5b57\u6bb5\u5916\u662f\u552f\u4e00\u7684\uff0c\u6240\u4ee5\u6211\u4eec\u4e3a c2 \u5217\u5efa\u7acb\u4e8c\u7ea7\u7d22\u5f15\u540e\u7684\u793a\u610f\u56fe\u5b9e\u9645\u4e0a\u5e94\u8be5\u662f\u8fd9\u6837\u5b50\u7684\uff1a<\/p>\n\n\n\n
        \"\"<\/figure>\n\n\n\n
        3.\u4e00\u4e2a\u9875\u9762\u6700\u5c11\u5b58\u50a82\u6761\u8bb0\u5f55<\/h4>\n\n\n\n
        \u4e00\u4e2aB+\u6811\u53ea\u9700\u8981\u5f88\u5c11\u7684\u5c42\u7ea7\u5c31\u53ef\u4ee5\u8f7b\u677e\u5b58\u50a8\u6570\u4ebf\u6761\u8bb0\u5f55\uff0c\u67e5\u8be2\u901f\u5ea6\u76f8\u5f53\u4e0d\u9519\uff01\u8fd9\u662f\u56e0\u4e3aB+\u6811\u672c\u8d28\u4e0a\u5c31\u662f\u4e00\u4e2a\u5927\u7684\u591a\u5c42\u7ea7\u76ee\u5f55\uff0c\u6bcf\u7ecf\u8fc7\u4e00\u4e2a\u76ee\u5f55\u65f6\u90fd\u4f1a\u8fc7\u6ee4\u6389\u8bb8\u591a\u65e0\u6548\u7684\u5b50\u76ee\u5f55\uff0c\u76f4\u5230\u6700\u540e\u8bbf\u95ee\u5230\u5b58\u50a8\u771f\u5b9e\u6570\u636e\u7684\u76ee\u5f55\u3002\u90a3\u5982\u679c\u4e00\u4e2a\u5927\u7684\u76ee\u5f55\u4e2d\u53ea\u5b58\u653e\u4e00\u4e2a\u5b50\u76ee\u5f55\u662f\u4e2a\u5565\u6548\u679c\u5462\uff1f\u90a3\u5c31\u662f\u76ee\u5f55\u5c42\u7ea7\u975e\u5e38\u975e\u5e38\u975e\u5e38\u591a\uff0c\u800c\u4e14\u6700\u540e\u7684\u90a3\u4e2a\u5b58\u653e\u771f\u5b9e\u6570\u636e\u7684\u76ee\u5f55\u4e2d\u53ea\u80fd\u5b58\u653e\u4e00\u6761\u8bb0\u5f55\u3002\u8d39\u4e86\u534a\u5929\u52b2\u53ea\u80fd\u5b58\u653e\u4e00\u6761\u771f\u5b9e\u7684\u7528\u6237\u8bb0\u5f55\uff1f\u6240\u4ee5InnoDB\u7684\u4e00\u4e2a\u6570\u636e\u9875\u81f3\u5c11\u53ef\u4ee5\u5b58\u653e\u4e24\u6761\u8bb0\u5f55\u3002<\/p>\n\n\n\n
        4.MyISAM\u4e2d\u7684\u7d22\u5f15\u65b9\u6848<\/h2>\n\n\n\n
        \u7d22\u5f15\/\u5b58\u50a8\u5f15\u64ce<\/td>MylSAM<\/td>InnqDB<\/td>Memory<\/td><\/tr>
        B-Tree\u7d22\u5f15<\/td>\u652f\u6301<\/td>\u652f\u6301<\/td>\u652f\u6301<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
        \u5373\u4f7f\u591a\u4e2a\u5b58\u50a8\u5f15\u64ce\u652f\u6301\u540c\u4e00\u79cd\u7c7b\u578b\u7684\u7d22\u5f15l\uff0c\u4f46\u662f\u4ed6\u4eec\u7684\u5b9e\u73b0\u539f\u7406\u4e5f\u662f\u4e0d\u540c\u7684\u3002Innodb\u548cMyISAM\u9ed8\u8ba4\u7684\u7d22\u5f15\u662fBtree\u7d22\u5f15\uff1b\u800cMemory\u9ed8\u8ba4\u7684\u7d22\u5f15\u662fHash\u7d22\u5f15\u3002
        MylSAM\u5f15\u64ce\u4f7f\u7528B+Tree\u4f5c\u4e3a\u7d22\u5f15\u7ed3\u6784\uff0c\u53f6\u5b50\u8282\u70b9\u7684data\u57df\u5b58\u653e\u7684\u662f\u6570\u636e\u8bb0\u5f55\u7684\u5730\u5740\u3002<\/p>\n\n\n\n
        4.2MyISAM\u7d22\u5f15I\u7684\u539f\u7406<\/h3>\n\n\n\n
        \u4e0b\u56fe\u662fMyISAM\u7d22\u5f15\u7684\u539f\u7406\u56fe\u3002<\/p>\n\n\n\n
        \u6211\u4eec\u77e5\u9053InnoDB\u4e2d\u7d22\u5f15\u5373\u6570\u636e\uff0c\u4e5f\u5c31\u662f\u805a\u7c07\u7d22\u5f15\u7684\u90a3\u68f5B+\u6811\u7684\u53f6\u5b50\u8282\u70b9\u4e2d\u5df2\u7ecf\u628a\u6240\u6709\u5b8c\u6574\u7684\u7528\u6237\u8bb0\u5f55\u90fd\u5305\u542b\u4e86\uff0c\u800cMyISAM\u7684\u7d22\u5f15\u5f15\u65b9\u6848\u867d\u7136\u4e5f\u4f7f\u7528\u6811\u5f62\u7ed3\u6784\uff0c\u4f46\u662f\u5374\u5c06\u7d22\u5f15\u548c\u6570\u636e\u5206\u5f00\u5b58\u50a8\uff1a<\/p>\n\n\n\n
          \n
        1. \u5c06\u8868\u4e2d\u7684\u8bb0\u5f55\u6309\u7167\u8bb0\u5f55\u7684\u63d2\u5165\u987a\u5e8f\u5355\u72ec\u5b58\u50a8\u5728\u4e00\u4e2a\u6587\u4ef6\u4e2d\uff0c\u79f0\u4e4b\u4e3a\u6570\u636e\u6587\u4ef6\u3002\u8fd9\u4e2a\u6587\u4ef6\u5e76\u4e0d\u5212\u5206\u4e3a\u82e5\u5e72\u4e2a\u6570\u636e\u9875\uff0c\u6709\u591a\u5c11\u8bb0\u5f55\u5c31\u5f80\u8fd9\u4e2a\u6587\u4ef6\u4e2d\u585e\u591a\u5c11\u8bb0\u5f55\u5c31\u6210\u4e86\u3002\u7531\u4e8e\u5728\u63d2\u5165\u6570\u636e\u7684\u65f6\u5019\u5e76\u6ca1\u6709\u523b\u610f\u6309\u7167\u4e3b\u952e\u5927\u5c0f\u6392\u5e8f\uff0c\u6240\u4ee5\u6211\u4eec\u5e76\u4e0d\u80fd\u5728\u8fd9\u4e9b\u6570\u636e\u4e0a\u4f7f\u7528\u4e8c\u5206\u6cd5\u8fdb\u884c\u67e5\u627e\u3002<\/li>\n\n\n\n
        2. \u4f7f\u7528MyISAM\u5b58\u50a8\u5f15\u64ce\u7684\u8868\u4f1a\u628a\u7d22\u5f15\u4fe1\u606f\u53e6\u5916\u5b58\u50a8\u5230\u4e00\u4e2a\u79f0\u4e3a\u7d22\u5f15\u6587\u4ef6\u7684\u53e6\u4e00\u4e2a\u6587\u4ef6\u4e2d\u3002MyISAM\u4f1a\u5355\u72ec\u4e3a\u8868\u7684\u4e3b\u952e\u521b\u5efa\u4e00\u4e2a\u7d22\u5f15\uff0c\u53ea\u4e0d\u8fc7\u5728\u7d22\u5f15\u7684\u53f6\u5b50\u8282\u70b9\u4e2d\u5b58\u50a8\u7684\u4e0d\u662f\u5b8c\u6574\u7684\u7528\u6237\u8bb0\u5f55\uff0c\u800c\u662f\u4e3b\u952e\u503c+\u6570\u636e\u8bb0\u5f55\u5730\u5740\u7684\u7ec4\u5408\u3002\uff08\u53ef\u4ee5\u770b\u4f5cmyisam\u662f\u6ca1\u6709\u805a\u7c07\u7d22\u5f15\uff0c\u53ea\u6709\u4e8c\u7ea7\u7d22\u5f15\uff09<\/li>\n<\/ol>\n\n\n\n
          \"\"<\/p>\n\n\n\n
          \u8fd9\u91cc\u8bbe\u8868\u4e00\u5171\u6709\u4e09\u5217\uff0c\u5047\u8bbe\u6211\u4eec\u4ee5col1\u4e3a\u4e3b\u952e\uff0c\u4e0a\u56fe\u662f\u4e00\u4e2aMyISAM\u8868\u7684\u4e3b\u7d22\u5f15\uff08Primarykey\uff09\u793a\u610f\u3002\u53ef\u4ee5\u770b\u51faMyISAM\u7684\u7d22\u5f15\u6587\u4ef6\u4ec5\u4ec5\u4fdd\u5b58\u6570\u636e\u8bb0\u5f55\u7684\u5730\u5740**\u3002\u5728MyISAM\u4e2d\uff0c\u4e3b\u952e\u7d22\u5f15\u548c\u4e8c\u7ea7\u7d22\u5f15\uff08Secondarykey\uff09\u5728\u7ed3\u6784\u4e0a\u6ca1\u6709\u4efb\u4f55\u533a\u522b\uff0c\u53ea\u662f\u4e3b\u952e\u7d22\u5f15\u8981\u6c42key\u662f\u552f\u4e00\u7684\uff0c\u800c\u4e8c\u7ea7\u7d22\u5f15\u7684key\u53ef\u4ee5\u91cd\u590d\u3002\u5982\u679c\u6211\u4eec\u5728Col2\u4e0a\u5efa\u7acb\u4e00\u4e2a\u4e8c\u7ea7\u7d22\u5f15\uff0c\u5219\u6b64\u7d22\u5f15\u7684\u7ed3\u6784\u5982\u4e0b\u56fe\u6240\u793a\uff1a\"\"<\/p>\n\n\n\n
           4.3MyISAM\u4e0eInnoDB\u5bf9\u6bd4<\/h4>\n\n\n\n
          MyISAM\u7684\u7d22\u5f15\u65b9\u5f0f\u90fd\u662f\u201c\u975e\u805a\u7c07\"\u7684\uff0c\u4e0eInnoDB\u5305\u542b1\u4e2a\u805a\u7c07\u7d22\u5f15\u662f\u4e0d\u540c\u7684\u3002\u5c0f\u7ed3\u4e24\u79cd\u5f15\u64ce\u4e2d\u7d22\u5f15\u7684\u533a\u522b\uff1a<\/p>\n\n\n\n
            \n
          • \u2460\u5728InnoDB\u5b58\u50a8\u5f15\u64ce\u4e2d\uff0c\u6211\u4eec\u53ea\u9700\u8981\u6839\u636e\u4e3b\u952e\u503c\u5bf9\u805a\u7c07\u7d22\u5f15\u8fdb\u884c\u4e00\u6b21\u67e5\u627e\u5c31\u80fd\u627e\u5230\u5bf9\u5e94\u7684\u8bb0\u5f55\uff0c\u800c\u5728MyISAM\u4e2d\u5374\u9700\u8981\u8fdb\u884c\u4e00\u6b21\u56de\u8868\u64cd\u4f5c\uff0c\u610f\u5473\u7740MyISAM\u4e2d\u5efa\u7acb\u7684\u7d22\u5f15\u76f8\u5f53\u4e8e\u5168\u90e8\u90fd\u662f\u4e8c\u7ea7\u7d22\u5f15\u3002<\/li>\n\n\n\n
          • \u2461InnoDB\u7684\u6570\u636e\u6587\u4ef6\u672c\u8eab\u5c31\u662f\u7d22\u5f15\u6587\u4ef6\uff0c\u800cMyISAM\u7d22\u5f15\u6587\u4ef6\u548c\u6570\u636e\u6587\u4ef6\u662f\u5206\u79bb\u7684\uff0c\u7d22\u5f15\u6587\u4ef6\u4ec5\u4fdd\u5b58\u6570\u636e\u8bb0\u5f55\u7684\u5730\u5740\u3002<\/li>\n\n\n\n
          • \u2462 InnoDB\u7684\u975e\u805a\u7c07\u7d22\u5f15ldata\u57df\u5b58\u50a8\u76f8\u5e94\u8bb0\u5f55\u4e3b\u952e\u7684\u503c\uff0c\u800cMyISAM\u7d22\u5f15\u5f15\u8bb0\u5f55\u7684\u662f\u5730\u5740\u3002\u6362\u53e5\u8bdd\u8bf4\uff0cInnoDB\u7684\u6240\u6709\u975e\u805a\u7c07\u7d22\u5f15\u90fd\u5f15\u7528\u4e3b\u952e\u4f5c\u4e3adata\u57df\u3002<\/li>\n\n\n\n
          • \u2463MyISAM\u7684\u56de\u8868\u64cd\u4f5c\u662f\u5341\u5206\u5feb\u901f\u7684\uff0c\u56e0\u4e3a\u662f\u62ff\u7740\u5730\u5740\u504f\u79fb\u91cf\u76f4\u63a5\u5230\u6587\u4ef6\u4e2d\u53d6\u6570\u636e\u7684\uff0c\u53cd\u89c2InnoDB\u662f\u901a\u8fc7\u83b7\u53d6\u4e3b\u952e\u4e4b\u540e\u518d\u53bb\u805a\u7c07\u7d22\u5f15\u91cc\u627e\u8bb0\u5f55\uff0c\u867d\u7136\u8bf4\u4e5f\u4e0d\u6162\uff0c\u4f46\u8fd8\u662f\u6bd4\u4e0d\u4e0a\u76f4\u63a5\u7528\u5730\u5740\u53bb\u8bbf\u95ee\u3002<\/li>\n\n\n\n
          • \u2464InnoDB\u8981\u6c42\u8868\u5fc5\u987b\u6709\u4e3b\u952e\uff08MyISAM\u53ef\u4ee5\u6ca1\u6709\uff09\u3002\u5982\u679c\u6ca1\u6709\u663e\u5f0f\u6307\u5b9a\uff0c\u5219MySQL\u7cfb\u7edf\u4f1a\u81ea\u52a8\u9009\u62e9\u4e00\u4e2a\u53ef\u4ee5\u975e\u7a7a\u4e14\u552f\u4e00\u6807\u8bc6\u6570\u636e\u8bb0\u5f55\u7684\u5217\u4f5c\u4e3a\u4e3b\u952e\u3002\u5982\u679c\u4e0d\u5b58\u5728\u8fd9\u79cd\u5217\uff0c\u5219MySQL\u81ea\u52a8\u4e3aInnoDB\u8868\u751f\u6210\u4e00\u4e2a\u9690\u542b\u5b57\u6bb5\u4f5c\u4e3a\u4e3b\u952e\uff0c\u8fd9\u4e2a\u5b57\u6bb5\u957f\u5ea6\u4e3a6\u4e2a\u5b57\u8282\uff0c\u7c7b\u578b\u4e3a\u957f\u6574\u578b\u3002<\/li>\n<\/ul>\n\n\n\n
            \u5c0f\u7ed3\uff1a
            \u4e86\u89e3\u4e0d\u540c\u5b58\u50a8\u5f15\u64ce\u7684\u7d22\u5f15\u5b9e\u73b0\u65b9\u5f0f\u5bf9\u4e8e\u6b63\u786e\u4f7f\u7528\u548c\u4f18\u5316\u7d22\u5f15\u90fd\u975e\u5e38\u6709\u5e2e\u52a9\u3002\u6bd4\u5982\uff1a
            \u4e3e\u4f8b1\uff1a\u77e5\u9053\u4e86InnoDB\u7684\u7d22\u5f15\u5b9e\u73b0\u540e\uff0c\u5c31\u5f88\u5bb9\u6613\u660e\u767d\u4e3a\u4ec0\u4e48\u4e0d\u5efa\u8bae\u4f7f\u7528\u8fc7\u957f\u7684\u5b57\u6bb5\u4f5c\u4e3a\u4e3b\u952e\uff0c\u56e0\u4e3a\u6240\u6709\u4e8c\u7ea7\u7d22\u5f15\u90fd\u5f15\u7528\u4e3b\u952e\u7d22\u5f15\uff0c\u8fc7\u957f\u7684\u4e3b\u952e\u7d22\u5f15\u4f1a\u4ee4\u4e8c\u7ea7\u7d22\u5f15\u53d8\u5f97\u8fc7\u5927\u3002<\/strong>
            \u4e3e\u4f8b2\uff1a\u7528\u975e\u5355\u8c03\u7684\u5b57\u6bb5\u4f5c\u4e3a\u4e3b\u952e\u5728lnnoDB\u4e2d\u4e0d\u662f\u4e2a\u597d\u4e3b\u610f\uff0c\u56e0\u4e3alnnoDB\u6570\u636e\u6587\u4ef6\u672c\u8eab\u662f\u4e00\u68f5B+Tree\uff0c\u975e\u5355\u8c03\u7684\u4e3b\u952e\u4f1a\u9020\u6210\u5728\u63d2\u5165\u65b0\u8bb0\u5f55\u65f6\uff0c\u6570\u636e\u6587\u4ef6\u4e3a\u4e86\u7ef4\u6301B+Tree\u7684\u7279\u6027\u800c\u9891\u7e41\u7684\u5206\u88c2\u8c03\u6574\uff0c\u5341\u5206\u4f4e\u6548\uff0c\u800c\u4f7f\u7528\u81ea\u589e\u5b57\u6bb5\u4f5c\u4e3a\u4e3b\u952e\u5219\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u9009\u62e9\u3002<\/strong><\/p>\n\n\n\n
             5.\u7d22\u5f15\u7684\u4ee3\u4ef7<\/h2>\n\n\n\n
            \u7d22\u5f15\u662f\u4e2a\u597d\u4e1c\u897f\uff0c\u53ef\u4e0d\u80fd\u4e71\u5efa\uff0c\u5b83\u5728\u7a7a\u95f4\u548c\u65f6\u95f4\u4e0a\u90fd\u4f1a\u6709\u6d88\u8017\uff1a<\/p>\n\n\n\n
            \u7a7a\u95f4\u4e0a\u7684\u4ee3\u4ef7
            \u5efa\u7acb\u4e00\u4e2a\u7d22\u5f15\u90fd\u8981\u4e3a\u5b83\u5efa\u7acb\u4e00\u68f5B+\u6811\uff0c\u6bcf\u4e00\u68f5B+\u6811\u7684\u6bcf\u4e00\u4e2a\u8282\u70b9\u90fd\u662f\u4e00\u4e2a\u6570\u636e\u9875\uff0c\u4e00\u4e2a\u9875\u9ed8\u8ba4\u4f1a\u5360\u752816KB\u7684\u5b58\u50a8\u7a7a\u95f4\uff0c\u4e00\u68f5\u5f88\u5927\u7684B+\u6811\u7531\u8bb8\u591a\u6570\u636e\u9875\u7ec4\u6210\uff0c\u5c31\u662f\u5f88\u5927\u7684\u4e00\u7247\u5b58\u50a8\u7a7a\u95f4\u3002<\/p>\n\n\n\n
            \u65f6\u95f4\u4e0a\u7684\u4ee3\u4ef7
            \u6bcf\u6b21\u5bf9\u8868\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u589e\u3001\u5220\u3001\u6539\u64cd\u4f5c\u65f6\uff0c\u90fd\u9700\u8981\u53bb\u4fee\u6539\u5404\u4e2aB+\u6811\u7d22\u5f15\u3002\u800c\u4e14\u6211\u4eec\u8bb2\u8fc7\uff0cB+\u6811\u6bcf\u5c42\u8282\u70b9\u90fd\u662f\u6309\u7167\u7d22\u5f15\u5217\u7684\u503c\u4ece\u5c0f\u5230\u5927\u7684\u987a\u5e8f\u6392\u5e8f\u800c\u7ec4\u6210\u4e86\u53cc\u5411\u94fe\u8868\u3002\u4e0d\u8bba\u662f\u53f6\u5b50\u8282\u70b9\u4e2d\u7684\u8bb0\u5f55\uff0c\u8fd8\u662f\u5185\u8282\u70b9\u4e2d\u7684\u8bb0\u5f55\uff08\u4e5f\u5c31\u662f\u4e0d\u8bba\u662f\u7528\u6237\u8bb0\u5f55\u8fd8\u662f\u76ee\u5f55\u9879\u8bb0\u5f55\uff09\u90fd\u662f\u6309\u7167\u7d22\u5f15\u5217\u7684\u503c\u4ece\u5c0f\u5230\u5927\u7684\u987a\u5e8f\u800c\u5f62\u6210\u4e86\u4e00\u4e2a\u5355\u5411\u94fe\u8868\u3002\u800c\u589e\u3001\u5220\u3001\u6539\u64cd\u4f5c\u53ef\u80fd\u4f1a\u5bf9\u8282\u70b9\u548c\u8bb0\u5f55\u7684\u6392\u5e8f\u9020\u6210\u7834\u574f\uff0c\u6240\u4ee5\u5b58\u50a8\u5f15\u64ce\u9700\u8981\u989d\u5916\u7684\u65f6\u95f4\u8fdb\u884c\u4e00\u4e9b\u8bb0\u5f55\u79fb\u4f4d\uff0c\u9875\u9762\u5206\u88c2\u3001\u9875\u9762\u56de\u6536\u7b49\u64cd\u4f5c\u6765\u7ef4\u62a4\u597d\u8282\u70b9\u548c\u8bb0\u5f55\u7684\u6392\u5e8f\u3002\u5982\u679c\u6211\u4eec\u5efa\u4e86\u8bb8\u591a\u7d22\u5f15\uff0c\u6bcf\u4e2a\u7d22\u5f15\u5bf9\u5e94\u7684B+\u6811\u90fd\u8981\u8fdb\u884c\u76f8\u5173\u7684\u7ef4\u62a4\u64cd\u4f5c\uff0c\u4f1a\u7ed9\u6027\u80fd\u62d6\u540e\u817f\u3002<\/p>\n\n\n\n
            6.MySQL\u6570\u636e\u7ed3\u6784\u9009\u62e9\u7684\u5408\u7406\u6027<\/h2>\n\n\n\n
            \u78c1\u76d8\u7684IO\u64cd\u4f5c\u6b21\u6570\u5bf9\u7d22\u5f15\u7684\u4f7f\u7528\u6548\u7387\u81f3\u5173\u91cd\u8981\u3002<\/p>\n\n\n\n
            \u67e5\u627e\u90fd\u662f\u7d22\u5f15\u64cd\u4f5c\uff0c\u4e00\u822c\u6765\u8bf4\u7d22\u5f15\u975e\u5e38\u5927\uff0c\u5c24\u5176\u662f\u5173\u7cfb\u578b\u6570\u636e\u5e93\uff0c\u5f53\u6570\u636e\u91cf\u6bd4\u8f83\u5927\u7684\u65f6\u5019\uff0c\u7d22\u5f15\u7684\u5927\u5c0f\u6709\u53ef\u80fd\u51e0\u4e2aG\u751a\u81f3\u66f4\u591a\uff0c\u4e3a\u4e86\u51cf\u5c11\u7d22\u5f15\u5728\u5185\u5b58\u7684\u5360\u7528\uff0c\u6570\u636e\u5e93\u7d22\u5f15\u662f\u5b58\u50a8\u5728\u5916\u90e8\u78c1\u76d8\u4e0a\u7684\u3002\u5f53\u6211\u4eec\u5229\u7528\u7d22\u5f15\u67e5\u8be2\u7684\u65f6\u5019\uff0c\u4e0d\u53ef\u80fd\u628a\u6574\u4e2a\u7d22\u5f15\u5168\u90e8\u52a0\u8f7d\u5230\u5185\u5b58\uff0c\u53ea\u80fd\u9010\u4e00\u52a0\u8f7d\uff0c\u90a3\u4e48MySQL\u8861\u91cf\u67e5\u8be2\u6548\u7387\u7684\u6807\u51c6\u5c31\u662f\u78c1\u76d8IO\u6b21\u6570\u3002<\/p>\n\n\n\n
            6.1\u5168\u8868\u904d\u5386<\/h3>\n\n\n\n
            \u8fd9\u4e2a\u6ca1\u4ec0\u4e48<\/p>\n\n\n\n
            6.2Hash\u7ed3\u6784<\/h3>\n\n\n\n
            Hash\u672c\u8eab\u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u53c8\u88ab\u79f0\u4e3a\u6563\u5217\u51fd\u6570\uff0c\u5b83\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5927\u5e45\u63d0\u5347\u68c0\u7d22\u6570\u636e\u7684\u6548\u7387\u3002
            Hash\u7b97\u6cd5\u662f\u901a\u8fc7\u67d0\u79cd\u786e\u5b9a\u6027\u7684\u7b97\u6cd5\uff08\u6bd4\u5982MD5\u3001SHA1\u3001SHA2\u3001SHA3\uff09\u5c06\u8f93\u5165\u8f6c\u53d8\u4e3a\u8f93\u51fa\u3002\u76f8\u540c\u7684\u8f93\u5165\u6c38\u8fdc\u53ef\u4ee5\u5f97\u5230\u76f8\u540c\u7684\u8f93\u51fa\uff0c\u5047\u8bbe\u8f93\u5165\u5185\u5bb9\u6709\u5fae\u5c0f\u504f\u5dee\uff0c\u5728\u8f93\u51fa\u4e2d\u901a\u5e38\u4f1a\u6709\u4e0d\u540c\u7684\u7ed3\u679c\u3002<\/p>\n\n\n\n
            \u4e3e\u4f8b\uff1a\u5982\u679c\u4f60\u60f3\u8981\u9a8c\u8bc1\u4e24\u4e2a\u6587\u4ef6\u662f\u5426\u76f8\u540c\uff0c\u90a3\u4e48\u4f60\u4e0d\u9700\u8981\u628a\u4e24\u4efd\u6587\u4ef6\u76f4\u63a5\u62ff\u6765\u6bd4\u5bf9\uff0c\u53ea\u9700\u8981\u8ba9\u5bf9\u65b9\u628aHash\u51fd\u6570\u8ba1\u7b97\u5f97\u5230\u7684\u7ed3\u679c\u544a\u8bc9\u4f60\u5373\u53ef\uff0c\u7136\u540e\u5728\u672c\u5730\u540c\u6837\u5bf9\u6587\u4ef6\u8fdb\u884cHash\u51fd\u6570\u7684\u8fd0\u7b97\uff0c\u6700\u540e\u901a\u8fc7\u6bd4\u8f83\u8fd9\u4e24\u4e2aHash\u51fd\u6570\u7684\u7ed3\u679c\u662f\u5426\u76f8\u540c\uff0c\u5c31\u53ef\u4ee5\u77e5\u9053\u8fd9\u4e24\u4e2a\u6587\u4ef6\u662f\u5426\u76f8\u540c\u3002<\/p>\n\n\n\n
            \u52a0\u901f\u67e5\u627e\u901f\u5ea6\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5e38\u89c1\u7684\u6709\u4e24\u7c7b\uff1a
            (1)\u6811\uff0c\u4f8b\u5982\u5e73\u8861\u4e8c\u53c9\u641c\u7d22\u6811\uff0c\u67e5\u8be2\/\u63d2\u5165\/\u4fee\u6539\/\u5220\u9664\u7684\u5e73\u5747\u65f6\u95f4\u590d\u6742\u5ea6\u90fd\u662fO (log2N\uff09;
            (2)\u54c8\u5e0c\uff0c\u4f8b\u5982HashMap\uff0c\u67e5\u8be2\/\u63d2\u5165\/\u4fee\u6539\/\u5220\u9664\u7684\u5e73\u5747\u65f6\u95f4\u590d\u6742\u5ea6\u90fd\u662fO\uff081\uff09\uff1b\u4ece\u6548\u7387\u6765\u8bf4Hash\u6bd4B+\u6811\u66f4\u5feb\u3002<\/strong><\/p>\n\n\n\n
            \"\"<\/p>\n\n\n\n
            \u00a0\u4f46\u662f\u5982\u679c17\u548c37\u5171\u540c%16\u600e\u4e48\u529e\uff1f\u90a3\u4e48\u6211\u4eec\u94fe\u63a5\u4e00\u4e0b\uff0c\u7c7b\u4f3cjava\u4e2d\u7684hashmap\u601d\u60f3<\/strong>\"\"<\/p>\n\n\n\n
            \/\/ \u7b97\u6cd5\u590d\u6742\u5ea6\u4e3a O(n2)\n@Test\npublic void test1(){\n    int[] arr = new int[100000];\n    for(int i = 0; i < arr.length; i++){\n        arr[i] = i + 1;\n    }\n\n    long start = System.currentTimeMillis();\n    for(int j = 1; j <= 100000; j++){\n        int temp = j;\n        for(int i = 0; i < arr.length; i++){\n            if(temp == arr[i]){\n                break;\n            }\n        }\n    }\n    long end = System.currentTimeMillis();\n    System.out.println(\"time: \" + (end - start)); \/\/time: 823\n}\n\n\/\/ \u7b97\u6cd5\u590d\u6742\u5ea6\u4e3a O(1)\n@Test\npublic void test2(){\n    HashSet<Integer> set = new HashSet<>(100000);\n    for(int i = 0; i < 100000; i++){\n        set.add(i + 1);\n    }\n\n    long start = System.currentTimeMillis();\n    for(int j = 1; j <= 100000; j++){\n        int temp = j;\n        boolean contains = set.contains(temp);\n    }\n    long end = System.currentTimeMillis();\n    System.out.println(\"time: \" + (end - start)); \/\/time: 5\n}<\/code><\/pre>\n\n\n\n
            Hash\u7ed3\u6784\u6548\u7387\u9ad8\uff0c\u90a3\u4e3a\u4ec0\u4e48\u7d22\u5f15\u7ed3\u6784\u8981\u8bbe\u8ba1\u6210\u6811\u578b\u5462\uff1f
            \u539f\u56e01\uff1aHash\u7d22\u5f15l\u4ec5\u80fd\u6ee1\u8db3\uff08=\uff09\uff08<>\uff09\u548cIN\u67e5\u8be2\u3002\u5982\u679c\u8fdb\u884c\u8303\u56f4\u67e5\u8be2<\/strong>\uff0c\u54c8\u5e0c\u578b\u7684\u7d22\u5f15l\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u4f1a\u9000\u5316\u4e3aO(n)\uff1a\u800c\u6811\u578b\u7684\u201c\u6709\u5e8f\"\u7279\u6027\uff0c\u4f9d\u7136\u80fd\u591f\u4fdd\u6301O(log2N)<\/strong>\u7684\u9ad8\u6548\u7387\u3002
            \u539f\u56e02\uff1aHash\u7d22\u5f15\u8fd8\u6709\u4e00\u4e2a\u7f3a\u9677\uff0c\u6570\u636e\u7684\u5b58\u50a8\u662f\u6ca1\u6709\u987a\u5e8f\u7684\uff0c\u5728ORDERBY\u7684\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528Hash\u7d22\u5f15\u8fd8\u9700\u8981\u5bf9\u6570\u636e\u91cd\u65b0\u6392\u5e8f\u3002
            \u539f\u56e03\uff1a\u5bf9\u4e8e\u8054\u5408\u7d22\u5f15\u7684\u60c5\u51b5\uff0cHash\u503c\u662f\u5c06\u8054\u5408\u7d22\u5f15\u952e\u5408\u5e76\u540e\u4e00\u8d77\u6765\u8ba1\u7b97\u7684\uff0c\u65e0\u6cd5\u5bf9\u5355\u72ec\u7684\u4e00\u4e2a\u952e\u6216\u8005\u51e0\u4e2a\u7d22\u5f15\u952e\u8fdb\u884c\u67e5\u8be2\u3002
            \u539f\u56e04\uff1a\u5bf9\u4e8e\u7b49\u503c\u67e5\u8be2\u6765\u8bf4\uff0c\u901a\u5e38Hash\u7d22\u5f15\u7684\u6548\u7387\u66f4\u9ad8\uff0c\u4e0d\u8fc7\u4e5f\u5b58\u5728\u4e00\u79cd\u60c5\u51b5\uff0c\u5c31\u662f\u7d22\u5f15\u5217\u7684\u91cd\u590d\u503c\u5982\u679c\u5f88\u591a\uff0c\u6548\u7387\u5c31\u4f1a\u964d\u4f4e\u3002<\/strong>\u8fd9\u662f\u56e0\u4e3a\u9047\u5230Hash\u51b2\u7a81\u65f6\uff0c\u9700\u8981\u904d\u5386\u6876\u4e2d\u7684\u884c\u6307\u9488\u6765\u8fdb\u884c\u6bd4\u8f83\uff0c\u627e\u5230\u67e5\u8be2\u7684\u5173\u952e\u5b57\uff0c\u975e\u5e38\u8017\u65f6\u3002\u6240\u4ee5\uff0cHash\u7d22\u5f15\u901a\u5e38\u4e0d\u4f1a\u7528\u5230\u91cd\u590d\u503c\u591a\u7684\u5217\u4e0a\uff0c\u6bd4\u5982\u5217\u4e3a\u6027\u522b\u3001\u5e74\u9f84\u7684\u60c5\u51b5\u7b49\u3002<\/strong><\/p>\n\n\n\n
             HASH\u7d22\u5f15 \u4ec5\u5728memory\u4e2d \u652f\u6301<\/strong><\/p>\n\n\n\n
             Hash\u7d22\u5f15\u5b58\u5728\u7740\u5f88\u591a\u9650\u5236\uff0c\u76f8\u6bd4\u4e4b\u4e0b\u5728\u6570\u636e\u5e93\u4e2dB+\u6811\u7d22\u5f15\u7684\u4f7f\u7528\u9762\u4f1a\u66f4\u5e7f\uff0c\u4e0d\u8fc7\u4e5f\u6709\u4e00\u4e9b\u573a\u666f\u91c7\u7528Hash\u7d22\u5f15\u6548\u7387\u66f4\u9ad8\uff0c\u6bd4\u5982\u5728\u952e\u503c\u578b\uff08Key-Value\uff09\u6570\u636e\u5e93\u4e2d\uff0cRedis\u5b58\u50a8\u7684\u6838\u5fc3\u5c31\u662fHash\u8868\u3002<\/p>\n\n\n\n
            \u53e6\u5916\uff0cInnoDB\u672c\u8eab\u4e0d\u652f\u6301Hash\u7d22\u5f15\uff0c\u4f46\u662f\u63d0\u4f9b\u81ea\u9002\u5e94Hash\u7d22\u5f15\uff08AdaptiveHashIndex\uff09\u3002\u4ec0\u4e48\u60c5\u51b5\u4e0b\u624d\u4f1a\u4f7f\u7528\u81ea\u9002\u5e94Hash\u7d22\u5f15\u5462\uff1f\u5982\u679c\u67d0\u4e2a\u6570\u636e\u7ecf\u5e38\u88ab\u8bbf\u95ee\uff0c\u5f53\u6ee1\u8db3\u4e00\u5b9a\u6761\u4ef6\u7684\u65f6\u5019\uff0c\u5c31\u4f1a\u5c06\u8fd9\u4e2a\u6570\u636e\u9875\u7684\u5730\u5740\u5b58\u653e\u5230Hash\u8868\u4e2d\u3002\u8fd9\u6837\u4e0b\u6b21\u67e5\u8be2\u7684\u65f6\u5019\uff0c\u5c31\u53ef\u4ee5\u76f4\u63a5\u627e\u5230\u8fd9\u4e2a\u9875\u9762\u7684\u6240\u5728\u4f4d\u7f6e\u3002\u8fd9\u6837\u8ba9B+\u6811\u4e5f\u5177\u5907\u4e86Hash\u7d22\u5f15\u7684\u4f18\u70b9\u3002<\/p>\n\n\n\n
            \u91c7\u7528\u81ea\u9002\u5e94Hash\u7d22\u5f15\u76ee\u7684\u662f\u65b9\u4fbf\u6839\u636eSQL\u7684\u67e5\u8be2\u6761\u4ef6\u52a0\u901f\u5b9a\u4f4d\u5230\u53f6\u5b50\u8282\u70b9\uff0c\u7279\u522b\u662f\u5f53B+\u6811\u6bd4\u8f83\u6df1\u7684\u65f6\u5019\uff0c\u901a\u8fc7\u81ea\u9002\u5e94Hash\u7d22\u5f15\u53ef\u4ee5\u660e\u663e\u63d0\u9ad8\u6570\u636e\u7684\u68c0\u7d22\u6548\u7387\u3002
            \u6211\u4eec\u53ef\u4ee5\u901a\u8fc7innodb_adaptive_hash_index\u53d8\u91cf\u6765\u67e5\u770b\u662f\u5426\u5f00\u542f\u4e86\u81ea\u9002\u5e94Hash\uff0c\u6bd4\u5982\uff1a<\/p>\n\n\n\n
            mysql> show variables like '%adaptive_hash_index';<\/code><\/pre>\n\n\n\n
            6.3 \u4e8c\u53c9\u641c\u7d22\u6811<\/h3>\n\n\n\n
             \u5de6\u5b50\u8282\u70b9<\u672c\u8282\u70b9\uff1b\u53f3\u5b50\u8282\u70b9>=\u672c\u8282\u70b9\uff0c\u6bd4\u6211\u5927\u7684\u5411\u53f3\uff0c\u6bd4\u6211\u5c0f\u7684\u5411\u5de6<\/p>\n\n\n\n
            \u00a0\"\"\"\"7\u6b21\u6bd4\u8f83\u624d\u80fd\u627e\u5230\u8282\u70b9<\/p>\n\n\n\n
             6.4 AVL\u6811<\/h3>\n\n\n\n
            \u4e3a\u4e86\u89e3\u51b3\u4e0a\u9762\u4e8c\u53c9\u67e5\u627e\u6811\u9000\u5316\u6210\u94fe\u8868\u7684\u95ee\u9898\uff0c\u4eba\u4eec\u63d0\u51fa\u4e86\u5e73\u8861\u4e8c\u53c9\u641c\u7d22\u6811\uff08BalancedBinaryTree\uff09\uff0c\u53c8\u79f0\u4e3aAVL\u6811\uff08\u6709\u522b\u4e8eAVL\u7b97\u6cd5\uff09\uff0c\u5b83\u5728\u4e8c\u53c9\u641c\u7d22\u6811\u7684\u57fa\u7840\u4e0a\u589e\u52a0\u4e86\u7ea6\u675f\uff0c\u5177\u6709\u4ee5\u4e0b\u6027\u8d28\uff1a
            \u5b83\u662f\u4e00\u68f5\u7a7a\u6811\u6216\u5b83\u7684\u5de6\u53f3\u4e24\u4e2a\u5b50\u6811\u7684\u9ad8\u5ea6\u5dee\u7684\u7edd\u5bf9\u503c\u4e0d\u8d85\u8fc71\uff0c\u5e76\u4e14\u5de6\u53f3\u4e24\u4e2a\u5b50\u6811\u90fd\u662f\u4e00\u68f5\u5e73\u8861\u4e8c\u53c9\u6811\u3002<\/strong>
            \u8fd9\u91cc\u8bf4\u4e00\u4e0b\uff0c\u5e38\u89c1\u7684\u5e73\u8861\u4e8c\u53c9\u6811\u6709\u5f88\u591a\u79cd\uff0c\u5305\u62ec\u4e86\u5e73\u8861\u4e8c\u53c9\u641c\u7d22\u6811\u3001\u7ea2\u9ed1\u6811\u3001\u6570\u5806\u3001\u4f38\u5c55\u6811\u3002\u5e73\u8861\u4e8c\u53c9\u641c\u7d22\u6811\u662f\u6700\u65e9\u63d0\u51fa\u6765\u7684\u81ea\u5e73\u8861\u4e8c\u53c9\u641c\u7d22\u6811\uff0c\u5f53\u6211\u4eec\u63d0\u5230\u5e73\u8861\u4e8c\u53c9\u6811\u65f6\u4e00\u822c\u6307\u7684\u5c31\u662f\u5e73\u8861\u4e8c\u53c9\u641c\u7d22\u6811\u3002\u4e8b\u5b9e\u4e0a\uff0c\u7b2c\u4e00\u68f5\u6811\u5c31\u5c5e\u4e8e\u5e73\u8861\u4e8c\u53c9\u641c\u7d22\u6811\uff0c\u641c\u7d22\u65f6\u95f4\u590d\u6742\u5ea6\u5c31\u662fO( log2n\uff09\u3002<\/p>\n\n\n\n
            \"\"\"\"<\/p>\n\n\n\n
             6.5 B-Tree<\/h3>\n\n\n\n
            B\u6811\u7684\u82f1\u6587\u662fBalanceTree\uff0c\u4e5f\u5c31\u662f\u591a\u8def\u5e73\u8861\u67e5\u627e\u6811<\/strong>\u3002\u7b80\u5199\u4e3aB-Tree\uff08\u6ce8\u610f\u6a2a\u6760\u8868\u793a\u8fd9\u4e24\u4e2a\u5355\u8bcd\u8fde\u8d77\u6765\u7684\u610f\u601d\uff0c\u4e0d\u662f\u51cf\u53f7\uff09\u3002\u5b83\u7684\u9ad8\u5ea6\u8fdc\u5c0f\u4e8e\u5e73\u8861\u4e8c\u53c9\u6811\u7684\u9ad8\u5ea6\u3002
            B\u6811\u7684\u7ed3\u6784\u5982\u4e0b\u56fe\u6240\u793a\uff1a\"\"<\/p>\n\n\n\n
              \n
            1. \u00a0B\u6811\u5728\u63d2\u5165\u548c\u5220\u9664\u8282\u70b9\u7684\u65f6\u5019\u5982\u679c\u5bfc\u81f4\u6811\u4e0d\u5e73\u8861\uff0c\u5c31\u901a\u8fc7\u81ea\u52a8\u8c03\u6574\u8282\u70b9\u7684\u4f4d\u7f6e\u6765\u4fdd\u6301\u6811\u7684\u81ea\u5e73\u8861\u3002<\/li>\n\n\n\n
            2. \u5173\u952e\u5b57\u96c6\u5408\u5206\u5e03\u5728\u6574\u68f5\u6811\u4e2d\uff0c\u5373\u53f6\u5b50\u8282\u70b9\u548c\u975e\u53f6\u5b50\u8282\u70b9\u90fd\u5b58\u653e\u6570\u636e\u3002\u641c\u7d22\u6709\u53ef\u80fd\u5728\u975e\u53f6\u5b50\u8282\u70b9\u7ed3\u675f<\/li>\n\n\n\n
            3. \u5176\u641c\u7d20\u6027\u80fd\u7b49\u4ef7\u4e8e\u5728\u5173\u952e\u5b57\u5168\u96c6\u5185\u505a\u4e00\u6b21\u4e8c\u5206\u67e5\u627e\u3002<\/li>\n<\/ol>\n\n\n\n
              \"\"<\/p>\n\n\n\n
              6.6 B+Tree<\/h3>\n\n\n\n
              B+\u6811\u4e5f\u662f\u4e00\u79cd\u591a\u8def\u641c\u7d22\u6811\uff0c\u57fa\u4e8eB\u6811\u505a\u51fa\u4e86\u6539\u8fdb\uff0c\u4e3b\u6d41\u7684DBMS\u90fd\u652f\u6301B+\u6811\u7684\u7d22\u5f15\u65b9\u5f0f\uff0c\u6bd4\u5982MySQL\u3002\u76f8\u6bd4\u4e8eB-Tree\uff0cB+Tree\u9002\u5408\u6587\u4ef6\u7d22\u5f15\u7cfb\u7edf\u3002 <\/p>\n\n\n\n
               B+\u6811\u548cB\u6811\u7684\u5dee\u5f02\u5728\u4e8e\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n\n\n\n
                \n
              • 1\uff0e\u6709k\u4e2a\u5b69\u5b50\u7684\u8282\u70b9\u5c31\u6709k\u4e2a\u5173\u952e\u5b57\u3002\u4e5f\u5c31\u662f\u5b69\u5b50\u6570\u91cf=\u5173\u952e\u5b57\u6570\uff0c\u800c B \u6811\u4e2d\uff0c\u5b69\u5b50\u6570\u91cf=\u5173\u952e\u5b57\u6570+1\u3002<\/li>\n\n\n\n
              • 2\uff0e\u975e\u53f6\u5b50\u8282\u70b9\u7684\u5173\u952e\u5b57\u4e5f\u4f1a\u540c\u65f6\u5b58\u5728\u5728\u5b50\u8282\u70b9\u4e2d\uff0c\u5e76\u4e14\u662f\u5728\u5b50\u8282\u70b9\u4e2d\u6240\u6709\u5173\u952e\u5b57\u7684\u6700\u5927\uff08\u6216\u6700\u5c0f\uff09\u3002<\/li>\n\n\n\n
              • 3\uff0e\u975e\u53f6\u5b50\u8282\u70b9\u4ec5\u7528\u4e8e\u7d22\u5f15\uff0c\u4e0d\u4fdd\u5b58\u6570\u636e\u8bb0\u5f55\uff0c\u8ddf\u8bb0\u5f55\u6709\u5173\u7684\u4fe1\u606f\u90fd\u653e\u5728\u53f6\u5b50\u8282\u70b9\u4e2d\u3002\u800cB \u6811\u4e2d\uff0c\u975e\u53f6\u5b50\u8282\u70b9\u65e2\u4fdd\u5b58\u7d22\u5f15\uff0c\u4e5f\u4fdd\u5b58\u6570\u636e\u8bb0\u5f55\u3002<\/li>\n\n\n\n
              • 4\uff0e\u6240\u6709\u5173\u952e\u5b57\u90fd\u5728\u53f6\u5b50\u8282\u70b9\u51fa\u73b0\uff0c\u53f6\u5b50\u8282\u70b9\u6784\u6210\u4e00\u4e2a\u6709\u5e8f\u94fe\u8868\uff0c\u800c\u4e14\u53f6\u5b50\u8282\u70b9\u672c\u8eab\u6309\u7167\u5173\u952e\u5b57\u7684\u5927\u5c0f\u4ece\u5c0f\u5230\u5927\u987a\u5e8f\u94fe\u63a5\u3002<\/li>\n<\/ul>\n\n\n\n
                \"\"<\/figure>\n\n\n\n
                \"\"<\/p>\n\n\n\n
                \u6bd4\u5982\uff0c\u6211\u4eec\u60f3\u8981\u67e5\u627e\u5173\u952e\u5b5716\uff0cB+\u6811\u4f1a\u81ea\u9876\u5411\u4e0b\u9010\u5c42\u8fdb\u884c\u67e5\u627e\uff1a
                1\uff0e \u4e0e\u6839\u8282\u70b9\u7684\u5173\u952e\u5b57(1\uff0c18\uff0c35)\u8fdb\u884c\u6bd4\u8f83\uff0c16\u57281\u548c18\u4e4b\u95f4\uff0c\u5f97\u5230\u6307\u9488P1(\u6307\u5411\u78c1\u76d8\u57572)
                2.\u00a0 \u00a0\u627e\u5230\u78c1\u76d8\u57572\uff0c\u5173\u952e\u5b57\u4e3a\uff081\uff0c8\uff0c14\uff09\uff0c\u56e0\u4e3a16\u5927\u4e8e14\uff0c\u6240\u4ee5\u5f97\u5230\u6307\u9488P3\uff08\u6307\u5411\u78c1\u76d8\u57577\uff09
                3.\u00a0 \u00a0\u627e\u5230\u78c1\u76d8\u57577\uff0c\u5173\u952e\u5b57\u4e3a\uff0814\uff0c16\uff0c17\uff09\uff0c\u7136\u540e\u6211\u4eec\u627e\u5230\u4e86\u5173\u952e\u5b5716\uff0c\u6240\u4ee5\u53ef\u4ee5\u627e\u5230\u5173\u952e\u5b5716\u6240\u5bf9\u5e94\u7684\u6570\u636e\u3002<\/p>\n\n\n\n
                \n
                \u6574\u4e2a\u8fc7\u7a0b\u4e00\u5171\u8fdb\u884c\u4e863\u6b21io\u64cd\u4f5c\uff0c\u770b\u8d77\u6765B+\u6811\u548cB\u6811\u7684\u67e5\u8be2\u8fc7\u7a0b\u5dee\u4e0d\u591a\uff0c\u4f46\u662fB+\u6811\u548cB\u6811\u6709\u4e2a\u6839\u672c\u7684\u5dee\u5f02\u5728\u4e8e\uff0cB+\u6811\u7684\u4e2d\u95f4\u8282\u70b9\u5e76\u4e0d\u76f4\u63a5\u5b58\u50a8\u6570\u636e\u3002\u8fd9\u6837\u7684\u597d\u5904\u90fd\u6709\u4ec0\u4e48\u5462\uff1f
                \u9996\u5148\uff0cB+\u6811\u67e5\u8be2\u6548\u7387\u66f4\u7a33\u5b9a\u3002\u56e0\u4e3aB+\u6811\u6bcf\u6b21\u53ea\u6709\u8bbf\u95ee\u5230\u53f6\u5b50\u8282\u70b9\u624d\u80fd\u627e\u5230\u5bf9\u5e94\u7684\u6570\u636e\uff0c\u800c\u5728B\u6811\u4e2d\uff0c\u975e\u53f6\u5b50\u8282\u70b9\u4e5f\u4f1a\u5b58\u50a8\u6570\u636e\uff0c\u8fd9\u6837\u5c31\u4f1a\u9020\u6210\u67e5\u8be2\u6548\u7387\u4e0d\u7a33\u5b9a\u7684\u60c5\u51b5\uff0c\u6709\u65f6\u5019\u8bbf\u95ee\u5230\u4e86\u975e\u53f6\u5b50\u8282\u70b9\u5c31\u53ef\u4ee5\u627e\u5230\u5173\u952e\u5b57\uff0c\u800c\u6709\u65f6\u9700\u8981\u8bbf\u95ee\u5230\u53f6\u5b50\u8282\u70b9\u624d\u80fd\u627e\u5230\u5173\u952e\u5b57\u3002<\/p>\n\n\n\n
                \u5176\u6b21\uff0cB+\u6811\u7684\u67e5\u8be2\u6548\u7387\u66f4\u9ad8\u3002\u8fd9\u662f\u56e0\u4e3a\u901a\u5e38B+\u6811\u6bd4B\u6811\u66f4\u77ee\u80d6\uff08\u9636\u6570\u66f4\u5927\uff0c\u6df1\u5ea6\u66f4\u4f4e\uff09\uff0c\u67e5\u8be2\u6240\u9700\u8981\u7684\u78c1\u76d8I\/O\u4e5f\u4f1a\u66f4\u5c11\u3002\u540c\u6837\u7684\u78c1\u76d8\u9875\u5927\u5c0f\uff0cB+\u6811\u53ef\u4ee5\u5b58\u50a8\u66f4\u591a\u7684\u8282\u70b9\u5173\u952e\u5b57\u3002<\/p>\n\n\n\n
                \u4e0d\u4ec5\u662f\u5bf9\u5355\u4e2a\u5173\u952e\u5b57\u7684\u67e5\u8be2\u4e0a\uff0c\u5728\u67e5\u8be2\u8303\u56f4\u4e0a\uff0cB+\u6811\u7684\u6548\u7387\u4e5f\u6bd4B\u6811\u9ad8\u3002\u8fd9\u662f\u56e0\u4e3a\u6240\u6709\u5173\u952e\u5b57\u90fd\u51fa\u73b0\u5728B+\u6811\u7684\u53f6\u5b50\u8282\u70b9\u4e2d\uff0c\u53f6\u5b50\u8282\u70b9\u4e4b\u95f4\u4f1a\u6709\u6307\u9488\uff0c\u6570\u636e\u53c8\u662f\u9012\u589e\u7684\uff0c\u8fd9\u4f7f\u5f97\u6211\u4eec\u8303\u56f4\u67e5\u627e\u53ef\u4ee5\u901a\u8fc7\u6307\u9488\u8fde\u63a5\u67e5\u627e\u3002\u800c\u5728B\u6811\u4e2d\u5219\u9700\u8981\u901a\u8fc7\u4e2d\u5e8f\u904d\u5386\u624d\u80fd\u5b8c\u6210\u67e5\u8be2\u8303\u56f4\u7684\u67e5\u627e\uff0c\u6548\u7387\u8981\u4f4e\u5f88\u591a\u3002

                B\u6811\u548cB+\u6811\u90fd\u53ef\u4ee5\u4f5c\u4e3a\u7d22\u5f15I\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5728MySQL\u4e2d\u91c7\u7528\u7684\u662fB+\u6811\u3002
                \u4f46B\u6811\u548cB+\u6811\u5404\u6709\u81ea\u5df1\u7684\u5e94\u7528\u573a\u666f\uff0c\u4e0d\u80fd\u8bf4B+\u6811\u5b8c\u5168\u6bd4B\u6811\u597d\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002<\/p>\n<\/blockquote>\n\n\n\n
                \u601d\u8003\u9898\uff1a\u4e3a\u4e86\u51cf\u5c11IO\uff0c\u7d22\u5f15\u6811\u4f1a\u4e00\u6b21\u6027\u52a0\u8f7d\u5417\uff1f<\/strong>
                1\u3001\u6570\u636e\u5e93\u7d22\u5f15\u662f\u5b58\u50a8\u5728\u78c1\u76d8\u4e0a\u7684\uff0c\u5982\u679c\u6570\u636e\u91cf\u5f88\u5927\uff0c\u5fc5\u7136\u5bfc\u81f4\u7d22\u5f15\u7684\u5927\u5c0f\u4e5f\u4f1a\u5f88\u5927\uff0c\u8d85\u8fc7\u51e0\u4e2aG\u3002
                2\u3001\u5f53\u6211\u4eec\u5229\u7528\u7d22\u5f15\u67e5\u8be2\u65f6\u5019\uff0c\u662f\u4e0d\u53ef\u80fd\u5c06\u5168\u90e8\u51e0\u4e2aG\u7684\u7d22\u5f15\u90fd\u52a0\u8f7d\u8fdb\u5185\u5b58\u7684\uff0c\u6211\u4eec\u80fd\u505a\u7684\u53ea\u80fd\u662f\uff1a\u9010\u4e00\u52a0\u8f7d\u6bcf\u4e00\u4e2a\u78c1\u76d8\u9875\uff0c\u56e0\u4e3a\u78c1\u76d8\u9875\u5bf9\u5e94\u7740\u7d22\u5f15\u6811\u7684\u8282\u70b9\u3002<\/p>\n\n\n\n
                \u601d\u8003\u9898\uff1aB+\u6811\u7684\u5b58\u50a8\u80fd\u529b\u5982\u4f55\uff1f\u4e3a\u4f55\u8bf4\u4e00\u822c\u67e5\u627e\u884c\u8bb0\u5f55\uff0c\u6700\u591a\u53ea\u97001~3\u6b21\u78c1\u76d8IO<\/strong>
                InnoDB\u5b58\u50a8\u5f15\u64ce\u4e2d\u9875\u7684\u5927\u5c0f\u4e3a16KB\uff0c\u4e00\u822c\u8868\u7684\u4e3b\u952e\u7c7b\u578b\u4e3aINT\uff08\u5360\u75284\u4e2a\u5b57\u8282\uff09\u6216BIGINT\uff08\u5360\u75288\u4e2a\u5b57\u8282\uff09\uff0c\u6307\u9488\u7c7b\u578b\u4e5f\u4e00\u822c\u4e3a4\u62168\u4e2a\u5b57\u8282\uff0c\u4e5f\u5c31\u662f\u8bf4\u4e00\u4e2a\u9875\uff08B+Tree\u4e2d\u7684\u4e00\u4e2a\u8282\u70b9\uff09\u4e2d\u5927\u6982\u5b58\u50a8
                16KB\/\uff088B+8B\uff09=1K\u4e2a\u952e\u503c\uff08\u56e0\u4e3a\u662f\u4f30\u503c\uff0c\u4e3a\u65b9\u4fbf\u8ba1\u7b97\uff0c\u8fd9\u91cc\u7684K\u53d6\u503c\u4e3a10^3\u3002\u4e5f\u5c31\u662f\u8bf4\u4e00\u4e2a\u6df1\u5ea6\u4e3a3\u7684B+Tree\u7d22\u5f15|\u53ef\u4ee5\u7ef4\u62a410^3*10^3*10^3=10\u4ebf\u6761\u8bb0\u5f55\u3002\uff08\u8fd9\u91cc\u5047\u5b9a\u4e00\u4e2a\u6570\u636e\u9875\u4e5f\u5b58\u50a810^3\u6761\u884c\u8bb0\u5f55\u6570\u636e\u4e86\uff09
                \u5b9e\u9645\u60c5\u51b5\u4e2d\u6bcf\u4e2a\u8282\u70b9\u53ef\u80fd\u4e0d\u80fd\u586b\u5145\u6ee1\uff0c\u56e0\u6b64\u5728\u6570\u636e\u5e93\u4e2d\uff0cB+Tree\u7684\u9ad8\u5ea6\u4e00\u822c\u90fd\u57282~4\u5c42\u3002MySQL\u7684InnoDB\u5b58\u50a8\u5f15\u64ce\u5728\u8bbe\u8ba1\u65f6\u662f\u5c06\u6839\u8282\u70b9\u5e38\u9a7b\u5185\u5b58\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u67e5\u627e\u67d0\u4e00\u952e\u503c\u7684\u884c\u8bb0\u5f55\u65f6\u6700\u591a\u53ea\u9700\u89811-3\u6b21\u78c1\u76d8IO\u64cd\u4f5c\u3002
                \u6bd4\u8f83\u7406\u60f3\u7684\u60c5\u51b5\u4e0b\uff0cb+\u6811\u91cc\u9762\u7684\u9875\u91cc\u9762\u7684\u6570\u636e\u5176\u5b9e\u81f3\u5c11\u6709\u4e09\u4e2a\uff08\u4e3b\u952e\uff0c\u9875\u6307\u9488\uff0c\u94fe\u8868\u7684next\u6307\u9488\uff09\u56e0\u6b64\u8001\u5e08\u8fd9\u4e2a\u6570\u7b97\u51fa\u6765\u662f\u504f\u5927\u7684\uff0c\u800c\u4e14\u5360\u6700\u5927\u5934\u7684\u90a3\u4e00\u90e8\u5206\u5b50\u53f6\u7684\u6570\u636e\u884c\u88ab\u5ffd\u7565\u4e86\u6240\u4ee5\u8981\u591a\u52a0\u4e00\u5c42\u624d\u66f4\u52a0\u7684\u5408\u7406;\u586b\u5145\u4e0d\u6ee1\u7684\u539f\u56e0\u5728\u4e8e\u4e00\u4e2aDatapage\u662f16kB,\u6709\u53ef\u80fd\u521a\u597d\u585e\u4e0d\u4e0b\u6700\u540e\u4e00\u6761\u6570\u636e<\/p>\n\n\n\n
                \u601d\u8003\u9898\uff1a\u4e3a\u4ec0\u4e48\u8bf4B+\u6811\u6bd4B-\u6811\u66f4\u9002\u5408\u5b9e\u9645\u5e94\u7528\u4e2d\u64cd\u4f5c\u7cfb\u7edf\u7684\u6587\u4ef6\u7d22\u5f15\u548c\u6570\u636e\u5e93\u7d22\u5f15\uff1f<\/strong>
                1\u3001B+\u6811\u7684\u78c1\u76d8\u8bfb\u5199\u4ee3\u4ef7\u66f4\u4f4e
                B+\u6811\u7684\u5185\u90e8\u7ed3\u70b9\u5e76\u6ca1\u6709\u6307\u5411\u5173\u952e\u5b57\u5177\u4f53\u4fe1\u606f\u7684\u6307\u9488\u3002\u56e0\u6b64\u5176\u5185\u90e8\u7ed3\u70b9\u76f8\u5bf9B\u6811\u66f4\u5c0f\u3002\u5982\u679c\u628a\u6240\u6709\u540c\u4e00\u5185\u90e8\u7ed3\u70b9\u7684\u5173\u952e\u5b57\u5b58\u653e\u5728\u540c\u4e00\u76d8\u5757\u4e2d\uff0c\u90a3\u4e48\u76d8\u5757\u6240\u80fd\u5bb9\u7eb3\u7684\u5173\u952e\u5b57\u6570\u91cf\u4e5f\u8d8a\u591a\u3002\u4e00\u6b21\u6027\u8bfb\u5165\u5185\u5b58\u4e2d\u7684\u9700\u8981\u67e5\u627e\u7684\u5173\u952e\u5b57\u4e5f\u5c31\u8d8a\u591a\u3002\u76f8\u5bf9\u6765\u8bf4io\u8bfb\u5199\u6b21\u6570\u4e5f\u5c31\u964d\u4f4e\u4e86\u3002
                2\u3001B+\u6811\u7684\u67e5\u8be2\u6548\u7387\u66f4\u52a0\u7a33\u5b9a
                \u7531\u4e8e\u975e\u7ec8\u7ed3\u70b9\u5e76\u4e0d\u662f\u6700\u7ec8\u6307\u5411\u6587\u4ef6\u5185\u5bb9\u7684\u7ed3\u70b9\uff0c\u800c\u53ea\u662f\u53f6\u5b50\u7ed3\u70b9\u4e2d\u5173\u952e\u5b57\u7684\u7d22\u5f15\u3002\u6240\u4ee5\u4efb\u4f55\u5173\u952e\u5b57\u7684\u67e5\u627e\u5fc5\u987b\u8d70\u4e00\u6761\u4ece\u6839\u7ed3\u70b9\u5230\u53f6\u5b50\u7ed3\u70b9\u7684\u8def\u3002\u6240\u6709\u5173\u952e\u5b57\u67e5\u8be2\u7684\u8def\u5f84\u957f\u5ea6\u76f8\u540c\uff0c\u5bfc\u81f4\u6bcf\u4e00\u4e2a\u6570\u636e\u7684\u67e5\u8be2\u6548\u7387\u76f8\u5f53\u3002<\/p>\n\n\n\n
                \u601d\u8003\u9898\uff1aHash \u7d22\u5f15\u4e0e B+ \u6811\u7d22\u5f15\u7684\u533a\u522b<\/strong>
                \u6211\u4eec\u4e4b\u524d\u8bb2\u5230\u8fc7B+\u6811\u7d22\u5f15\u7684\u7ed3\u6784\uff0cHash\u7d22\u5f15\u5f15\u7ed3\u6784\u548cB+\u6811\u7684\u4e0d\u540c\uff0c\u56e0\u6b64\u5728\u7d22\u5f15\u4f7f\u7528\u4e0a\u4e5f\u4f1a\u6709\u5dee\u522b\u3002
                1\u3001Hash\u7d22\u5f15\u4e0d\u80fd\u8fdb\u884c\u8303\u56f4\u67e5\u8be2<\/strong>\uff0c\u800cB+\u6811\u53ef\u4ee5\u3002\u8fd9\u662f\u56e0\u4e3aHash\u7d22\u5f15\u6307\u5411\u7684\u6570\u636e\u662f\u65e0\u5e8f\u7684\uff0c\u800cB+\u6811\u7684\u53f6\u5b50\u8282\u70b9\u662f\u4e2a\u6709\u5e8f\u7684\u94fe\u8868\u3002
                2\u3001Hash\u7d22\u5f15\u4e0d\u652f\u6301\u8054\u5408\u7d22\u5f15\u7684\u6700\u5de6\u4fa7\u539f\u5219<\/strong>\uff08\u5373\u8054\u5408\u7d22\u5f15\u7684\u90e8\u5206\u7d22\u5f15\u65e0\u6cd5\u4f7f\u7528\uff09\uff0c\u800cB+\u6811\u53ef\u4ee5\u3002\u5bf9\u4e8e\u8054\u5408\u7d22\u5f15\u6765\u8bf4\uff0cHash\u7d22\u5f15|\u5728\u8ba1\u7b97Hash\u503c\u7684\u65f6\u5019\u662f\u5c06\u7d22\u5f15\u952e\u5408\u5e76\u540e\u518d\u4e00\u8d77\u8ba1\u7b97Hash\u503c\uff0c\u6240\u4ee5\u4e0d\u4f1a\u9488\u5bf9\u6bcf\u4e2a\u7d22\u5f15\u5355\u72ec\u8ba1\u7b97Hash\u503c\u3002\u56e0\u6b64\u5982\u679c\u7528\u5230\u8054\u5408\u7d22\u5f15\u7684\u4e00\u4e2a\u6216\u8005\u51e0\u4e2a\u7d22\u5f15\u65f6\uff0c\u8054\u5408\u7d22\u5f15|\u65e0\u6cd5\u88ab\u5229\u7528\u3002
                3\u3001Hash\u7d22\u5f15\u4e0d\u652f\u6301ORDER BY\u6392\u5e8f<\/strong>\uff0c\u56e0\u4e3aHash\u7d22\u5f15\u6307\u5411\u7684\u6570\u636e\u662f\u65e0\u5e8f\u7684\uff0c\u56e0\u6b64\u65e0\u6cd5\u8d77\u5230\u6392\u5e8f\u4f18\u5316\u7684\u4f5c\u7528\uff0c\u800cB+\u6811\u7d22\u5f15\u6570\u636e\u662f\u6709\u5e8f\u7684\uff0c\u53ef\u4ee5\u8d77\u5230\u5bf9\u8be5\u5b57\u6bb5ORDERBY\u6392\u5e8f\u4f18\u5316\u7684\u4f5c\u7528\u3002\u540c\u7406\uff0c\u6211\u4eec\u4e5f\u65e0\u6cd5\u7528Hash\u7d22\u5f15\u8fdb\u884c\u6a21\u7cca\u67e5\u8be2\uff0c\u800cB+\u6811\u4f7f\u7528LIKE\u8fdb\u884c\u6a21\u7cca\u67e5\u8be2\u7684\u65f6\u5019\uff0cLIKE\u540e\u9762\u540e\u6a21\u7cca\u67e5\u8be2\uff08\u6bd4\u5982%\u7ed3\u5c3e\uff09\u7684\u8bdd\u5c31\u53ef\u4ee5\u8d77\u5230\u4f18\u5316\u4f5c\u7528\u3002
                4\u3001InnoDB\u4e0d\u652f\u6301\u54c8\u5e0c\u7d22\u5f15<\/strong><\/p>\n\n\n\n
                \u601d\u8003\u9898\uff1aHash \u7d22\u5f15\u4e0e B+ \u6811\u7d22\u5f15\u662f\u5728\u5efa\u7d22\u5f15\u7684\u65f6\u5019\u624b\u52a8\u6307\u5b9a\u7684\u5417\uff1f <\/strong>
                \u4f60\u80fd\u770b\u5230\uff0c\u9488\u5bf9InnoDB\u548cMyISAM\u5b58\u50a8\u5f15\u64ce\uff0c\u90fd\u4f1a\u9ed8\u8ba4\u91c7\u7528B+\u6811\u7d22\u5f15l\uff0c\u65e0\u6cd5\u4f7f\u7528Hash\u7d22\u5f15l\u3002InnoDB\u63d0\u4f9b\u7684\u81ea\u9002\u5e94Hash\u662f\u4e0d\u9700\u8981\u624b\u52a8\u6307\u5b9a\u7684\u3002\u5982\u679c\u662fMemory\/Heap\u548cNDB\u5b58\u50a8\u5f15\u64ce\uff0c\u662f\u53ef\u4ee5\u8fdb\u884c\u9009\u62e9Hash\u7d22\u5f15 \u7684\u3002<\/p>\n\n\n\n
                6.7 R\u6811<\/h3>\n\n\n\n
                R\u6811\u5c31\u5f88\u597d\u7684\u89e3\u51b3\u4e86\u8fd9\u79cd\u9ad8\u7ef4\u7a7a\u95f4\u641c\u7d22\u95ee\u9898\u3002 \u200b<\/p>\n","protected":false},"excerpt":{"rendered":"
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