{"id":500,"date":"2021-07-28T20:29:50","date_gmt":"2021-07-28T12:29:50","guid":{"rendered":"https:\/\/egonlin.com\/?p=500"},"modified":"2025-06-12T11:27:27","modified_gmt":"2025-06-12T03:27:27","slug":"%e7%b4%a2%e5%bc%95%e5%92%8c%e6%85%a2%e6%9f%a5%e8%af%a2","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=500","title":{"rendered":"\u7d22\u5f15\u548c\u6162\u67e5\u8be2"},"content":{"rendered":"

\u7d22\u5f15\u539f\u7406\u4e0e\u6162\u67e5\u8be2\u4f18\u5316<\/h1>\n

\u4e00 \u6211\u4eec\u8981\u641e\u660e\u767d\u7684\u95ee\u9898<\/h2>\n

\u8ba9\u6211\u4eec\u5e26\u7740\u4ee5\u4e0b\u95ee\u9898\u5c55\u5f00\u5bf9\u7d22\u5f15\u7684\u63a2\u7d22<\/p>\n

1\u3001\u4e3a\u4f55\u7d22\u5f15\u53ebkey<\/p>\n

2\u3001\u7d22\u5f15\u662f\u5982\u4f55\u52a0\u901f\u67e5\u8be2\u7684\uff0c\u5b83\u7684\u539f\u7406\u662f\u5565\uff1f<\/p>\n

\u7d22\u5f15\u6a21\u578b\/\u7ed3\u6784\u4ece\u4e8c\u53c9\u6811-\u300b\u5e73\u8861\u4e8c\u53c9\u6811-\u300bb\u6811\u6700\u540e\u5230b+\u6811\uff0c\u6bcf\u79cd\u6811\u5230\u5e95\u6709\u4ec0\u4e48\u95ee\u9898\u6700\u7ec8\u6f14\u53d8\u6210\u5230\u4e86b+\u6811<\/p>\n

3\u3001\u4e3a\u4f55b+\u6811\u4e0d\u4ec5\u80fd\u591f\u52a0\u901f\u7b49\u503c\u67e5\u8be2\uff0c\u8fd8\u80fd\u52a0\u901f\u8303\u56f4\u67e5\u8be2<\/p>\n

4\u3001\u4ec0\u4e48\u662f\u805a\u96c6\u7d22\u5f15\uff0c\u4ec0\u4e48\u662f\u8f85\u52a9\u7d22\u5f15<\/p>\n

5\u3001\u4ec0\u4e48\u60c5\u51b5\u4e0b\u53eb\u8986\u76d6\u4e86\u7d22\u5f15<\/p>\n

6\u3001\u4ec0\u4e48\u60c5\u51b5\u4e0b\u53eb\u56de\u8868\u64cd\u4f5c<\/p>\n

7\u3001\u4ec0\u4e48\u662f\u8054\u5408\u7d22\u5f15\uff0c\u6700\u5de6\u524d\u7f00\u5339\u914d\u539f\u5219<\/p>\n

8\u3001\u7d22\u5f15\u4e0b\u63a8\uff0c\u67e5\u8be2\u4f18\u5316<\/p>\n

9\u3001\u5982\u4f55\u6b63\u786e\u4f7f\u7528\u7d22\u5f15\uff1f<\/p>\n

\u4e8c \u7d22\u5f15\u4ecb\u7ecd<\/h2>\n

2.1 \u4ec0\u4e48\u662f\u7d22\u5f15<\/h3>\n
\u7d22\u5f15\u662f\u5b58\u50a8\u5f15\u64ce\u4e2d\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u6216\u8005\u8bf4\u6570\u636e\u7684\u7ec4\u7ec7\u65b9\u5f0f\uff0c\u53c8\u79f0\u4e4b\u4e3a\u952ekey\uff0c\u662f\u5b58\u50a8\u5f15\u64ce\u7528\u4e8e\u5feb\u901f\u627e\u5230\u8bb0\u5f55\u7684\u4e00\u79cd\u6570\u636e\u7ed3\u6784\u3002\r\n\u4e3a\u6570\u636e\u5efa\u7acb\u7d22\u5f15\u5c31\u597d\u6bd4\u662f\u4e3a\u4e66\u5efa\u76ee\u5f55\uff0c\u6216\u8005\u8bf4\u662f\u4e3a\u5b57\u5178\u521b\u5efa\u97f3\u5e8f\u8868\uff0c\u5982\u679c\u8981\u67e5\u67d0\u4e2a\u5b57\uff0c\u5982\u679c\u4e0d\u4f7f\u7528\u97f3\u5e8f\u8868\uff0c\u5219\u9700\u8981\u4ece\u51e0\u767e\u9875\u4e2d\u9010\u9875\u53bb\u67e5\u3002<\/code><\/pre>\n
2.2 \u4e3a\u4f55\u8981\u7528\u7d22\u5f15\uff1f<\/h3>\n
\u4e00\u822c\u7684\u5e94\u7528\u7cfb\u7edf\uff0c\u8bfb\u5199\u6bd4\u4f8b\u572810:1\u5de6\u53f3\uff0c\u800c\u4e14\u63d2\u5165\u64cd\u4f5c\u548c\u4e00\u822c\u7684\u66f4\u65b0\u64cd\u4f5c\u5f88\u5c11\u51fa\u73b0\u6027\u80fd\u95ee\u9898\uff0c\u5728\u751f\u4ea7\u73af\u5883\u4e2d\uff0c\u6211\u4eec\u9047\u5230\u6700\u591a\u7684\u3001\u4e5f\u662f\u6700\u5bb9\u6613\u51fa\u95ee\u9898\u7684\uff0c\u8fd8\u662f\u4e00\u4e9b\u590d\u6742\u7684\u67e5\u8be2\u64cd\u4f5c\uff0c\u56e0\u6b64\u5bf9\u67e5\u8be2\u8bed\u53e5\u7684\u4f18\u5316\u663e\u7136\u662f\u91cd\u4e2d\u4e4b\u91cd\u3002\u8bf4\u8d77\u52a0\u901f\u67e5\u8be2\uff0c\u5c31\u4e0d\u5f97\u4e0d\u63d0\u5230\u7d22\u5f15\u4e86\u3002\r\n\r\n\u7d22\u5f15\u4f18\u5316\u5e94\u8be5\u662f\u5bf9\u67e5\u8be2\u6027\u80fd\u4f18\u5316\u6700\u6709\u6548\u7684\u624b\u6bb5\u4e86\u3002\u7d22\u5f15\u80fd\u591f\u8f7b\u6613\u5c06\u67e5\u8be2\u6027\u80fd\u63d0\u9ad8\u597d\u51e0\u4e2a\u6570\u91cf\u7ea7\u3002<\/code><\/pre>\n
2.3 \u5982\u4f55\u6b63\u786e\u770b\u5f85\u7d22\u5f15\uff1f<\/h3>\n
# \u5148\u8bf4\u7ed3\u8bba\uff1a\r\n\u7d22\u5f15\u4e0d\u662f\u8d8a\u591a\u8d8a\u597d\uff0c\u5e76\u4e14egon\u5efa\u8bae\u5927\u5bb6\u6700\u597d\u5728\u63d0\u524d\u521b\u5efa\u597d\u7d22\u5f15\uff0c\u800c\u4e0d\u662f\u7b49\u706b\u70e7\u7709\u6bdb\r\n\r\n# \u8be6\u89e3\u5982\u4e0b\r\n\u7d22\u5f15\u662f\u5e94\u7528\u7a0b\u5e8f\u8bbe\u8ba1\u548c\u5f00\u53d1\u7684\u4e00\u4e2a\u91cd\u8981\u65b9\u9762\u3002\u82e5\u7d22\u5f15\u592a\u591a\uff0c\u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u53ef\u80fd\u4f1a\u53d7\u5230\u5f71\u54cd\u3002\u800c\u7d22\u5f15\u592a\u5c11\uff0c\u5bf9\u67e5\u8be2\u6027\u80fd\u53c8\u4f1a\u4ea7\u751f\u5f71\u54cd\uff0c\u8981\u627e\u5230\u4e00\u4e2a\u5e73\u8861\u70b9\uff0c\u8fd9\u5bf9\u5e94\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u81f3\u5173\u91cd\u8981\u3002\r\n\u4e00\u4e9b\u5f00\u53d1\u4eba\u5458\u603b\u662f\u5728\u4e8b\u540e\u624d\u60f3\u8d77\u6dfb\u52a0\u7d22\u5f15----\u6211\u4e00\u76f4\u8ba4\u4e3a\uff0c\u8fd9\u6e90\u4e8e\u4e00\u79cd\u9519\u8bef\u7684\u5f00\u53d1\u6a21\u5f0f\u3002\u5982\u679c\u77e5\u9053\u6570\u636e\u7684\u4f7f\u7528\uff0c\u4ece\u4e00\u5f00\u59cb\u5c31\u5e94\u8be5\u5728\u9700\u8981\u5904\u6dfb\u52a0\u7d22\u5f15\u3002\u5f00\u53d1\u4eba\u5458\u5f80\u5f80\u5bf9\u6570\u636e\u5e93\u7684\u4f7f\u7528\u505c\u7559\u5728\u5e94\u7528\u7684\u5c42\u9762\uff0c\u6bd4\u5982\u7f16\u5199SQL\u8bed\u53e5\u3001\u5b58\u50a8\u8fc7\u7a0b\u4e4b\u7c7b\uff0c\u4ed6\u4eec\u751a\u81f3\u53ef\u80fd\u4e0d\u77e5\u9053\u7d22\u5f15\u7684\u5b58\u5728\uff0c\u6216\u8ba4\u4e3a\u4e8b\u540e\u8ba9\u76f8\u5173DBA\u52a0\u4e0a\u5373\u53ef\u3002DBA\u5f80\u5f80\u4e0d\u591f\u4e86\u89e3\u4e1a\u52a1\u7684\u6570\u636e\u6d41\uff0c\u800c\u6dfb\u52a0\u7d22\u5f15\u9700\u8981\u901a\u8fc7\u76d1\u63a7\u5927\u91cf\u7684SQL\u8bed\u53e5\u8fdb\u800c\u4ece\u4e2d\u627e\u5230\u95ee\u9898\uff0c\u8fd9\u4e2a\u6b65\u9aa4\u6240\u9700\u7684\u65f6\u95f4\u80af\u5b9a\u662f\u8fdc\u5927\u4e8e\u521d\u59cb\u6dfb\u52a0\u7d22\u5f15\u6240\u9700\u7684\u65f6\u95f4\uff0c\u5e76\u4e14\u53ef\u80fd\u4f1a\u9057\u6f0f\u4e00\u90e8\u5206\u7684\u7d22\u5f15\u3002\u5f53\u7136\u7d22\u5f15\u4e5f\u5e76\u4e0d\u662f\u8d8a\u591a\u8d8a\u597d\uff0c\u6211\u66fe\u7ecf\u9047\u5230\u8fc7\u8fd9\u6837\u4e00\u4e2a\u95ee\u9898\uff1a\u67d0\u53f0MySQL\u670d\u52a1\u5668iostat\u663e\u793a\u78c1\u76d8\u4f7f\u7528\u7387\u4e00\u76f4\u5904\u4e8e100%\uff0c\u7ecf\u8fc7\u5206\u6790\u540e\u53d1\u73b0\u662f\u7531\u4e8e\u5f00\u53d1\u4eba\u5458\u6dfb\u52a0\u4e86\u592a\u591a\u7684\u7d22\u5f15\uff0c\u5728\u5220\u9664\u4e00\u4e9b\u4e0d\u5fc5\u8981\u7684\u7d22\u5f15\u4e4b\u540e\uff0c\u78c1\u76d8\u4f7f\u7528\u7387\u9a6c\u4e0a\u4e0b\u964d\u4e3a20%\u3002\u53ef\u89c1\u7d22\u5f15\u7684\u6dfb\u52a0\u4e5f\u662f\u975e\u5e38\u6709\u6280\u672f\u542b\u91cf\u7684\u3002<\/code><\/pre>\n
\u4e09 \u7406\u89e3\u7d22\u5f15\u7684\u50a8\u5907\u77e5\u8bc6<\/h2>\n
\u8981\u4e86\u89e3\u7d22\u5f15\u7684\u6570\u636e\u7ed3\u6784\u6211\u6765\u5148\u6765\u50a8\u5907\u4e00\u4e9b\u77e5\u8bc6<\/p>\n
1\uff09\u50a8\u5907\u77e5\u8bc61\uff1a\u673a\u68b0\u78c1\u76d8\u4e00\u6b21IO\u7684\u65f6\u95f4<\/p>\n
\u673a\u68b0\u78c1\u76d8\u4e00\u6b21io\u7684\u65f6\u95f4 = \u5bfb\u9053\u65f6\u95f4 + \u65cb\u8f6c\u5ef6\u8fdf + \u4f20\u8f93\u65f6\u95f4\r\n\r\n# \u5bfb\u9053\u65f6\u95f4\r\n\u9053\u65f6\u95f4\u6307\u7684\u662f\u78c1\u81c2\u79fb\u52a8\u5230\u6307\u5b9a\u78c1\u9053\u6240\u9700\u8981\u7684\u65f6\u95f4\uff0c\u4e3b\u6d41\u78c1\u76d8\u4e00\u822c\u57285ms\u4ee5\u4e0b\r\n\r\n# \u65cb\u8f6c\u5ef6\u8fdf\r\n\u65cb\u8f6c\u5ef6\u8fdf\u5c31\u662f\u6211\u4eec\u7ecf\u5e38\u542c\u8bf4\u7684\u78c1\u76d8\u8f6c\u901f\uff0c\u6bd4\u5982\u4e00\u4e2a\u78c1\u76d87200\u8f6c\uff0c\u8868\u793a\u6bcf\u5206\u949f\u80fd\u8f6c7200\u6b21\uff0c\u4e5f\u5c31\u662f\u8bf41\u79d2\u949f\u80fd\u8f6c120\u6b21\uff0c\u65cb\u8f6c\u5ef6\u8fdf\u5c31\u662f1\/120\/2 = 4.17ms\uff1b\r\n\r\n# \u4f20\u8f93\u65f6\u95f4\r\n\u4f20\u8f93\u65f6\u95f4\u6307\u7684\u662f\u4ece\u78c1\u76d8\u8bfb\u51fa\u6216\u5c06\u6570\u636e\u5199\u5165\u78c1\u76d8\u7684\u65f6\u95f4\uff0c\u4e00\u822c\u5728\u96f6\u70b9\u51e0\u6beb\u79d2\uff0c\u76f8\u5bf9\u4e8e\u524d\u4e24\u4e2a\u65f6\u95f4\u53ef\u4ee5\u5ffd\u7565\u4e0d\u8ba1\r\n\r\n\u6240\u4ee5\u8bbf\u95ee\u4e00\u6b21\u78c1\u76d8\u7684\u65f6\u95f4\uff0c\u5373\u4e00\u6b21\u78c1\u76d8IO\u7684\u65f6\u95f4\u7ea6\u7b49\u4e8e5+4.17 = 9ms\u5de6\u53f3\r\n\r\n\u8fd99ms\u5bf9\u4e8e\u4eba\u6765\u8bf4\u53ef\u80fd\u975e\u5e38\u77ed\uff0c\u4f46\u5bf9\u4e8e\u8ba1\u7b97\u673a\u6765\u53ef\u662f\u975e\u5e38\u957f\u7684\u4e00\u6bb5\u65f6\u95f4\uff0c\u957f\u5230\u4ec0\u4e48\u7a0b\u5ea6\u5462\uff1f\r\n\u4e00\u53f0500 -MIPS\uff08Million Instructions Per Second\uff09\u7684\u673a\u5668\u6bcf\u79d2\u53ef\u4ee5\u6267\u884c5\u4ebf\u6761\u6307\u4ee4\uff0c\u56e0\u4e3a\u6307\u4ee4\u4f9d\u9760\u7684\u662f\u7535\u7684\u6027\u8d28\uff0c\u6362\u53e5\u8bdd\u8bf4\u6267\u884c\u4e00\u6b21IO\u7684\u65f6\u95f4\u53ef\u4ee5\u6267\u884c\u7ea6450\u4e07\u6761\u6307\u4ee4\uff0c\u6570\u636e\u5e93\u52a8\u8f84\u5341\u4e07\u767e\u4e07\u4e43\u81f3\u5343\u4e07\u7ea7\u6570\u636e\uff0c\u6bcf\u6b219\u6beb\u79d2\u7684\u65f6\u95f4\uff0c\u663e\u7136\u662f\u4e2a\u707e\u96be\u3002<\/code><\/pre>\n
2\uff09\u50a8\u5907\u77e5\u8bc62\uff1a\u78c1\u76d8\u7684\u9884\u8bfb<\/p>\n
# \u8003\u8651\u5230\u78c1\u76d8IO\u662f\u975e\u5e38\u9ad8\u6602\u7684\u64cd\u4f5c\uff0c\u8ba1\u7b97\u673a\u64cd\u4f5c\u7cfb\u7edf\u505a\u4e86\u4e00\u4e9b\u4f18\u5316\uff1a\r\n\u5f53\u4e00\u6b21IO\u65f6\uff0c\u4e0d\u5149\u628a\u5f53\u524d\u78c1\u76d8\u5730\u5740\u7684\u6570\u636e\uff0c\u800c\u662f\u628a\u76f8\u90bb\u7684\u6570\u636e\u4e5f\u90fd\u8bfb\u53d6\u5230\u5185\u5b58\u7f13\u51b2\u533a\u5185\uff0c\u56e0\u4e3a\u5c40\u90e8\u9884\u8bfb\u6027\u539f\u7406\u544a\u8bc9\u6211\u4eec\uff0c\u5f53\u8ba1\u7b97\u673a\u8bbf\u95ee\u4e00\u4e2a\u5730\u5740\u7684\u6570\u636e\u7684\u65f6\u5019\uff0c\u4e0e\u5176\u76f8\u90bb\u7684\u6570\u636e\u4e5f\u4f1a\u5f88\u5feb\u88ab\u8bbf\u95ee\u5230\u3002\u6bcf\u4e00\u6b21IO\u8bfb\u53d6\u7684\u6570\u636e\u6211\u4eec\u79f0\u4e4b\u4e3a\u4e00\u9875(page)\u3002\u5177\u4f53\u4e00\u9875\u6709\u591a\u5927\u6570\u636e\u8ddf\u64cd\u4f5c\u7cfb\u7edf\u6709\u5173\uff0c\u4e00\u822c\u4e3a4k\u62168k\uff0c\u4e5f\u5c31\u662f\u6211\u4eec\u8bfb\u53d6\u4e00\u9875\u5185\u7684\u6570\u636e\u65f6\u5019\uff0c\u5b9e\u9645\u4e0a\u624d\u53d1\u751f\u4e86\u4e00\u6b21IO\uff0c\u8fd9\u4e2a\u7406\u8bba\u5bf9\u4e8e\u7d22\u5f15\u7684\u6570\u636e\u7ed3\u6784\u8bbe\u8ba1\u975e\u5e38\u6709\u5e2e\u52a9\u3002<\/code><\/pre>\n
3\uff09\u50a8\u5907\u77e5\u8bc63\uff1a\u7d22\u5f15\u539f\u7406\u7cbe\u9ad3\u63d0\u70bc<\/p>\n
\u7d22\u5f15\u7684\u76ee\u7684\u5728\u4e8e\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\uff0c\u4e0e\u6211\u4eec\u67e5\u9605\u56fe\u4e66\u6240\u7528\u7684\u76ee\u5f55\u662f\u4e00\u4e2a\u9053\u7406\uff1a\u5148\u5b9a\u4f4d\u5230\u7ae0\uff0c\u7136\u540e\u5b9a\u4f4d\u5230\u8be5\u7ae0\u4e0b\u7684\u4e00\u4e2a\u5c0f\u8282\uff0c\u7136\u540e\u627e\u5230\u9875\u6570\u3002\u76f8\u4f3c\u7684\u4f8b\u5b50\u8fd8\u6709\uff1a\u67e5\u5b57\u5178\uff0c\u67e5\u706b\u8f66\u8f66\u6b21\uff0c\u98de\u673a\u822a\u73ed\u7b49\r\n\r\n!!!!!!!!!!!!!!!!!!!!!!!!!!!!\r\n\u672c\u8d28\u90fd\u662f\uff1a\r\n\u901a\u8fc7\u4e0d\u65ad\u5730\u7f29\u5c0f\u60f3\u8981\u83b7\u53d6\u6570\u636e\u7684\u8303\u56f4\u6765\u7b5b\u9009\u51fa\u6700\u7ec8\u60f3\u8981\u7684\u7ed3\u679c\uff0c\u540c\u65f6\u628a\u968f\u673a\u7684\u4e8b\u4ef6\u53d8\u6210\u987a\u5e8f\u7684\u4e8b\u4ef6\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u6709\u4e86\u8fd9\u79cd\u7d22\u5f15\u673a\u5236\uff0c\u6211\u4eec\u53ef\u4ee5\u603b\u662f\u7528\u540c\u4e00\u79cd\u67e5\u627e\u65b9\u5f0f\u6765\u9501\u5b9a\u6570\u636e\u3002\r\n!!!!!!!!!!!!!!!!!!!!!!!!!!!!\r\n\r\n\u6570\u636e\u5e93\u4e5f\u662f\u4e00\u6837\uff0c\u4f46\u663e\u7136\u8981\u590d\u6742\u7684\u591a\uff0c\u56e0\u4e3a\u4e0d\u4ec5\u9762\u4e34\u7740\u7b49\u503c\u67e5\u8be2\uff0c\u8fd8\u6709\u8303\u56f4\u67e5\u8be2(>\u3001<\u3001between\u3001in)\u3001\u6a21\u7cca\u67e5\u8be2(like)\u3001\u5e76\u96c6\u67e5\u8be2(or)\u7b49\u7b49\u3002\u6570\u636e\u5e93\u5e94\u8be5\u9009\u62e9\u600e\u4e48\u6837\u7684\u65b9\u5f0f\u6765\u5e94\u5bf9\u6240\u6709\u7684\u95ee\u9898\u5462\uff1f\u6211\u4eec\u56de\u60f3\u5b57\u5178\u7684\u4f8b\u5b50\uff0c\u80fd\u4e0d\u80fd\u628a\u6570\u636e\u5206\u6210\u6bb5\uff0c\u7136\u540e\u5206\u6bb5\u67e5\u8be2\u5462\uff1f\u6700\u7b80\u5355\u7684\u5982\u679c1000\u6761\u6570\u636e\uff0c1\u5230100\u5206\u6210\u7b2c\u4e00\u6bb5\uff0c101\u5230200\u5206\u6210\u7b2c\u4e8c\u6bb5\uff0c201\u5230300\u5206\u6210\u7b2c\u4e09\u6bb5......\u8fd9\u6837\u67e5\u7b2c250\u6761\u6570\u636e\uff0c\u53ea\u8981\u627e\u7b2c\u4e09\u6bb5\u5c31\u53ef\u4ee5\u4e86\uff0c\u4e00\u4e0b\u5b50\u53bb\u9664\u4e8690%\u7684\u65e0\u6548\u6570\u636e\u3002\u4f46\u5982\u679c\u662f1\u5343\u4e07\u7684\u8bb0\u5f55\u5462\uff0c\u5206\u6210\u51e0\u6bb5\u6bd4\u8f83\u597d\uff1f\u7a0d\u6709\u7b97\u6cd5\u57fa\u7840\u7684\u540c\u5b66\u4f1a\u60f3\u5230\u641c\u7d22\u6811\uff0c\u5176\u5e73\u5747\u590d\u6742\u5ea6\u662flgN\uff0c\u5177\u6709\u4e0d\u9519\u7684\u67e5\u8be2\u6027\u80fd\u3002\u4f46\u8fd9\u91cc\u6211\u4eec\u5ffd\u7565\u4e86\u4e00\u4e2a\u5173\u952e\u7684\u95ee\u9898\uff0c\u590d\u6742\u5ea6\u6a21\u578b\u662f\u57fa\u4e8e\u6bcf\u6b21\u76f8\u540c\u7684\u64cd\u4f5c\u6210\u672c\u6765\u8003\u8651\u7684\u3002\u800c\u6570\u636e\u5e93\u5b9e\u73b0\u6bd4\u8f83\u590d\u6742\uff0c\u4e00\u65b9\u9762\u6570\u636e\u662f\u4fdd\u5b58\u5728\u78c1\u76d8\u4e0a\u7684\uff0c\u53e6\u5916\u4e00\u65b9\u9762\u4e3a\u4e86\u63d0\u9ad8\u6027\u80fd\uff0c\u6bcf\u6b21\u53c8\u53ef\u4ee5\u628a\u90e8\u5206\u6570\u636e\u8bfb\u5165\u5185\u5b58\u6765\u8ba1\u7b97\uff0c\u56e0\u4e3a\u6211\u4eec\u77e5\u9053\u8bbf\u95ee\u78c1\u76d8\u7684\u6210\u672c\u5927\u6982\u662f\u8bbf\u95ee\u5185\u5b58\u7684\u5341\u4e07\u500d\u5de6\u53f3\uff0c\u6240\u4ee5\u7b80\u5355\u7684\u641c\u7d22\u6811\u96be\u4ee5\u6ee1\u8db3\u590d\u6742\u7684\u5e94\u7528\u573a\u666f\u3002<\/code><\/pre>\n
\u56db \u7d22\u5f15\u5206\u7c7b<\/h2>\n
\u7d22\u5f15\u6a21\u578b\u5206\u4e3a\u5f88\u591a\u79cd\u7c7b<\/p>\n
#===========B+\u6811\u7d22\u5f15\uff08\u7b49\u503c\u67e5\u8be2\u4e0e\u8303\u56f4\u67e5\u8be2\u90fd\u5feb\uff09\r\n\u4e8c\u53c9\u6811->\u5e73\u8861\u4e8c\u53c9\u6811->B\u6811->B+\u6811\r\n\r\n#===========HASH\u7d22\u5f15(\u7b49\u503c\u67e5\u8be2\u5feb\uff0c\u8303\u56f4\u67e5\u8be2\u6162)\r\n\u5c06\u6570\u636e\u6253\u6563\u518d\u53bb\u67e5\u8be2\r\n\r\n#===========FULLTEXT\uff1a\u5168\u6587\u7d22\u5f15 \uff08\u53ea\u53ef\u4ee5\u7528\u5728MyISAM\u5f15\u64ce\uff09\r\n\u901a\u8fc7\u5173\u952e\u5b57\u7684\u5339\u914d\u6765\u8fdb\u884c\u67e5\u8be2\uff0c\u7c7b\u4f3c\u4e8elike\u7684\u6a21\u7cca\u5339\u914d\r\nlike + %\u5728\u6587\u672c\u6bd4\u8f83\u5c11\u65f6\u662f\u5408\u9002\u7684\r\n\u4f46\u662f\u5bf9\u4e8e\u5927\u91cf\u7684\u6587\u672c\u6570\u636e\u68c0\u7d22\u4f1a\u975e\u5e38\u7684\u6162\r\n\u5168\u6587\u7d22\u5f15\u5728\u5927\u91cf\u7684\u6570\u636e\u9762\u524d\u80fd\u6bd4like\u5feb\u5f97\u591a\uff0c\u4f46\u662f\u51c6\u786e\u5ea6\u5f88\u4f4e\r\n\u767e\u5ea6\u5728\u641c\u7d22\u6587\u7ae0\u7684\u65f6\u5019\u4f7f\u7528\u7684\u5c31\u662f\u5168\u6587\u7d22\u5f15\uff0c\u4f46\u66f4\u6709\u53ef\u80fd\u662fES<\/code><\/pre>\n
\u4e0d\u540c\u7684\u5b58\u50a8\u5f15\u64ce\u652f\u6301\u7684\u7d22\u5f15\u7c7b\u578b\u4e5f\u4e0d\u4e00\u6837<\/p>\n
    \n
  • InnoDB\u5b58\u50a8\u5f15\u64ce\n
    \u652f\u6301\u4e8b\u52a1\uff0c\u652f\u6301\u884c\u7ea7\u522b\u9501\u5b9a\uff0c\u652f\u6301 B-tree\uff08\u9ed8\u8ba4\uff09\u3001Full-text \u7b49\u7d22\u5f15\uff0c\u4e0d\u652f\u6301 Hash \u7d22\u5f15\uff1b<\/code><\/pre>\n<\/li>\n
  • MyISAM\u5b58\u50a8\u5f15\u64ce\n
    \u4e0d\u652f\u6301\u4e8b\u52a1\uff0c\u652f\u6301\u8868\u7ea7\u522b\u9501\u5b9a\uff0c\u652f\u6301 B-tree\u3001Full-text \u7b49\u7d22\u5f15\uff0c\u4e0d\u652f\u6301 Hash \u7d22\u5f15\uff1b<\/code><\/pre>\n<\/li>\n
  • Memory\u5b58\u50a8\u5f15\u64ce\n
    \u4e0d\u652f\u6301\u4e8b\u52a1\uff0c\u652f\u6301\u8868\u7ea7\u522b\u9501\u5b9a\uff0c\u652f\u6301 B-tree\u3001Hash \u7b49\u7d22\u5f15\uff0c\u4e0d\u652f\u6301 Full-text \u7d22\u5f15\uff1b<\/code><\/pre>\n<\/li>\n<\/ul>\n
    \u56e0\u4e3amysql\u9ed8\u8ba4\u7684\u5b58\u50a8\u5f15\u64ce\u662finnodb\uff0c\u800cinnodb\u5b58\u50a8\u5f15\u64ce\u7684\u7d22\u5f15\u6a21\u578b\/\u7ed3\u6784\u662fB+\u6811\uff0c\u6240\u4ee5\u6211\u4eec\u7740\u91cd\u4ecb\u7ecdB+\u6811\uff0c\u90a3\u4e48\u5927\u5bb6\u6700\u5173\u6ce8\u7684\u95ee\u9898\u6765\u4e86\uff1a<\/p>\n
    B+\u6811\u7d22\u5f15\u5230\u5e95\u662f\u5982\u4f55\u52a0\u901f\u67e5\u8be2\u7684\u5462\uff1f<\/p>\n
    \u4e94 \u7d22\u5f15\u7684\u6570\u636e\u7ed3\u6784<\/h2>\n
    5.1 \u521b\u5efa\u7d22\u5f15\u7684\u4e24\u5927\u6b65\u9aa4<\/h3>\n
    \u4e3a\u67d0\u4e2a\u5b57\u6bb5\u521b\u5efa\u7d22\u5f15\uff0c\u5373\u4ee5\u67d0\u4e2a\u5b57\u6bb5\u7684\u503c\u4e3a\u57fa\u7840\u6784\u5efa\u7d22\u5f15\u7ed3\u6784\uff0c\u90a3\u4e48\u5982\u4f55\u6784\u5efa\u5462\uff1f\u5206\u4e3a\u4e24\u5927\u6b65\u9aa4<\/p>\n
      \n
    • 1\u3001\u63d0\u53d6\u6bcf\u884c\u8bb0\u5f55\u4e2d\u8be5\u5b57\u6bb5\u7684\u503c\uff0c\u4ee5\u8be5\u503c\u5f53\u4f5ckey\uff0c\u81f3\u4e8ekey\u5bf9\u7684value\u662f\u4ec0\u4e48\uff1f\u6bcf\u79cd\u7d22\u5f15\u7ed3\u6784\u5404\u4e0d\u76f8\u540c<\/li>\n
    • 2\u3001\u7136\u540e\u4ee5key\u503c\u4e3a\u57fa\u7840\u6784\u5efa\u7d22\u5f15\u7ed3\u6784<\/li>\n<\/ul>\n
      \u4ee5\u540e\u7684\u67e5\u8be2\u6761\u4ef6\u4e2d\u4f7f\u7528\u4e86\u8be5\u5b57\u6bb5\uff0c\u5219\u4f1a\u547d\u4e2d\u7d22\u5f15\u7ed3\u6784<\/p>\n
      \u4f8b<\/p>\n
      # 1\u3001\u4e3auser\u8868\u7684id\u5b57\u6bb5\u521b\u5efa\u7d22\u5f15\uff0c\u4f1a\u4ee5\u6bcf\u6761\u8bb0\u5f55\u7684id\u5b57\u6bb5\u503c\u4e3a\u57fa\u7840\u751f\u6210\u7d22\u5f15\u7ed3\u6784\r\ncreate index \u7d22\u5f15\u540d on user(id);\r\n\r\n\u4f7f\u7528\u7d22\u5f15\r\nselect * from user where id = xxx;\r\n\r\n# 2\u3001\u4e3auser\u8868\u7684name\u5b57\u6bb5\u521b\u5efa\u7d22\u5f15\uff0c\u4f1a\u4ee5\u6bcf\u6761\u8bb0\u5f55\u7684name\u5b57\u6bb5\u503c\u4e3a\u57fa\u7840\u751f\u6210\u7d22\u5f15\u7ed3\u6784\r\ncreate index \u7d22\u5f15\u540d on user(id);\r\n\r\n\u4f7f\u7528\u7d22\u5f15\r\nselect * from user where name = xxx;<\/code><\/pre>\n
      \u90a3\u4e48\u7d22\u5f15\u7684\u7ed3\u6784\u5230\u5e95\u957f\u4ec0\u4e48\u6837\u5b50\uff0c\u8ba9\u5176\u80fd\u591f\u52a0\u901f\u67e5\u8be2\u5462\uff1f<\/p>\n
      innodb\u5b58\u50a8\u5f15\u64ce\u9ed8\u8ba4\u7684\u7d22\u5f15\u7ed3\u6784\u4e3aB+\u6811\uff0c\u800cB+\u6811\u662f\u7531\u4e8c\u53c9\u6811\u3001\u5e73\u8861\u4e8c\u53c9\u6811\u3001B\u6811\u518d\u5230B+\u6811\u4e00\u8def\u6f14\u53d8\u8fc7\u6765\u7684<\/p>\n
      5.2 \u4e8c\u53c9\u67e5\u627e\u6811<\/h3>\n
      \"\"<\/div><\/p>\n
      \u6709user\u8868\uff0c\u6211\u4eec\u4ee5id\u5b57\u6bb5\u503c\u4e3a\u57fa\u7840\u521b\u5efa\u7d22\u5f15<\/p>\n
        \n
      • 1\u3001\u63d0\u53d6\u6bcf\u4e00\u6761\u8bb0\u5f55\u7684id\u503c\u4f5c\u4e3akey\u503c\uff0cvalue\u4e3a\u672c\u884c\u5b8c\u6574\u8bb0\u5f55\uff0c\u5373\n
        key                  value\r\n10                   (10,zs)\r\n7                    (7,ls)\r\n13                   (13,ls)\r\n5                    (5,ls)\r\n8                    (8,ls)\r\n12                   (12,ls)\r\n17                   (17,ls)<\/code><\/pre>\n<\/li>\n
      • 2\u3001\u4ee5key\u503c\u7684\u5927\u5c0f\u4e3a\u57fa\u7840\u6784\u5efa\u4e8c\u53c9\u6811\uff0c\u5982\u4e0a\u56fe\u6240\u793a\n
        \u4e8c\u53c9\u67e5\u627e\u6811\u7684\u7279\u70b9\u5c31\u662f\u4efb\u4f55\u8282\u70b9\u7684\u5de6\u5b50\u8282\u70b9\u7684\u952e\u503c\u90fd\u5c0f\u4e8e\u5f53\u524d\u8282\u70b9\u7684\u952e\u503c\uff0c\u53f3\u5b50\u8282\u70b9\u7684\u952e\u503c\u90fd\u5927\u4e8e\u5f53\u524d\u8282\u70b9\u7684\u952e\u503c\u3002 \r\n\u9876\u7aef\u7684\u8282\u70b9\u6211\u4eec\u79f0\u4e3a\u6839\u8282\u70b9\uff0c\u6ca1\u6709\u5b50\u8282\u70b9\u7684\u8282\u70b9\u6211\u4eec\u79f0\u4e4b\u4e3a\u53f6\u8282\u70b9\u3002<\/code><\/pre>\n<\/li>\n<\/ul>\n
        \u5982\u679c\u6211\u4eec\u9700\u8981\u67e5\u627eid=12\u7684\u7528\u6237\u4fe1\u606f<\/p>\n
        select * from user where id=12;<\/code><\/pre>\n
        \u5229\u7528\u6211\u4eec\u521b\u5efa\u7684\u4e8c\u53c9\u67e5\u627e\u6811\u7d22\u5f15\uff0c\u67e5\u627e\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n
        1\u3001\u5c06\u6839\u8282\u70b9\u4f5c\u4e3a\u5f53\u524d\u8282\u70b9\uff0c\u628a12\u4e0e\u5f53\u524d\u8282\u70b9\u7684\u952e\u503c10\u6bd4\u8f83\uff0c12\u5927\u4e8e10\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u628a\u5f53\u524d\u8282\u70b9>\u7684\u53f3\u5b50\u8282\u70b9\u4f5c\u4e3a\u5f53\u524d\u8282\u70b9\u3002\r\n\r\n2\u3001\u7ee7\u7eed\u628a12\u548c\u5f53\u524d\u8282\u70b9\u7684\u952e\u503c13\u6bd4\u8f83\uff0c\u53d1\u73b012\u5c0f\u4e8e13\uff0c\u628a\u5f53\u524d\u8282\u70b9\u7684\u5de6\u5b50\u8282\u70b9\u4f5c\u4e3a\u5f53\u524d\u8282\u70b9\u3002\r\n\r\n3\u3001\u628a12\u548c\u5f53\u524d\u8282\u70b9\u7684\u952e\u503c12\u5bf9\u6bd4\uff0c12\u7b49\u4e8e12\uff0c\u6ee1\u8db3\u6761\u4ef6\uff0c\u6211\u4eec\u4ece\u5f53\u524d\u8282\u70b9\u4e2d\u53d6\u51fadata\uff0c\u5373id=1>2,name=xm\u3002<\/code><\/pre>\n
        \u5229\u7528\u4e8c\u53c9\u67e5\u627e\u6811\u6211\u4eec\u53ea\u9700\u89813\u6b21\u5373\u53ef\u627e\u5230\u5339\u914d\u7684\u6570\u636e\u3002\u5982\u679c\u5728\u8868\u4e2d\u4e00\u6761\u6761\u7684\u67e5\u627e\u7684\u8bdd\uff0c\u6211\u4eec\u9700\u89816\u6b21\u624d\u80fd\u627e\u5230\u3002<\/p>\n
        5.3 \u5e73\u8861\u4e8c\u53c9\u6811<\/h3>\n
        \u57fa\u4e8e5.1\u6240\u793a\u7684\u4e8c\u53c9\u6811\uff0c\u6211\u4eec\u786e\u5b9e\u53ef\u4ee5\u5feb\u901f\u5730\u627e\u5230\u6570\u636e\u3002<\/p>\n
        \u4f46\u662f\uff0c\u4f46\u662f\uff0c\u4f46\u662f\u8ba9\u6211\u4eec\u56de\u5230\u4e8c\u53c9\u67e5\u627e\u6811\u5730\u7279\u70b9\u4e0a\uff0c\u53ea\u8bba\u4e8c\u53c9\u67e5\u627e\u6811\uff0c\u5b83\u7684\u7279\u70b9\u53ea\u662f<\/p>\n
        \u4efb\u4f55\u8282\u70b9\u7684\u5de6\u5b50\u8282\u70b9\u7684\u952e\u503c\u90fd\u5c0f\u4e8e\u5f53\u524d\u8282\u70b9\u7684\u952e\u503c\uff0c\u53f3\u5b50\u8282\u70b9\u7684\u952e\u503c\u90fd\u5927\u4e8e\u5f53\u524d\u8282\u70b9\u7684\u952e\u503c\u3002 <\/code><\/pre>\n
        \u6240\u4ee5\uff0c\u4f9d\u636e\u4e8c\u53c9\u67e5\u627e\u6811\u7684\u7279\u70b9\uff0c\u4e8c\u53c9\u6811\u53ef\u4ee5\u662f\u8fd9\u6837\u6784\u9020\u7684<\/p>\n
        \"\"<\/div><\/p>\n
        \u8fd9\u4e2a\u65f6\u5019\u53ef\u4ee5\u770b\u5230\u6211\u4eec\u7684\u4e8c\u53c9\u67e5\u627e\u6811\u53d8\u6210\u4e86\u4e00\u4e2a\u94fe\u8868\u3002\u5982\u679c\u6211\u4eec\u9700\u8981\u67e5\u627eid=17\u7684\u7528\u6237\u4fe1\u606f\uff0c\u6211\u4eec\u9700\u8981\u67e5\u627e7\u6b21\uff0c\u4e5f\u5c31\u76f8\u5f53\u4e8e\u5168\u8868\u626b\u63cf\u4e86\u3002 \u5bfc\u81f4\u8fd9\u4e2a\u73b0\u8c61\u7684\u539f\u56e0\u5176\u5b9e\u662f\u4e8c\u53c9\u67e5\u627e\u6811\u53d8\u5f97\u4e0d\u5e73\u8861\u4e86\uff0c\u4e5f\u5c31\u662f\u9ad8\u5ea6\u592a\u9ad8\u4e86\uff0c\u4ece\u800c\u5bfc\u81f4\u67e5\u627e\u6548\u7387\u7684\u4e0d\u7a33\u5b9a\u3002 \u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u9700\u8981\u4fdd\u8bc1\u4e8c\u53c9\u67e5\u627e\u6811\u4e00\u76f4\u4fdd\u6301\u5e73\u8861\uff0c\u5c31\u9700\u8981\u7528\u5230\u5e73\u8861\u4e8c\u53c9\u6811\u4e86\u3002<\/p>\n
        \u5e73\u8861\u4e8c\u53c9\u6811\u53c8\u79f0AVL\u6811\uff0c\u5728\u6ee1\u8db3\u4e8c\u53c9\u67e5\u627e\u6811\u7279\u6027\u7684\u57fa\u7840\u4e0a\uff0c\u8981\u6c42\u6bcf\u4e2a\u8282\u70b9\u7684\u5de6\u53f3\u5b50\u6811\u7684\u9ad8\u5ea6\u4e0d\u80fd\u8d85\u8fc71\u3002 \u4e0b\u9762\u662f\u5e73\u8861\u4e8c\u53c9\u6811\u548c\u975e\u5e73\u8861\u4e8c\u53c9\u6811\u7684\u5bf9\u6bd4\uff1a<\/p>\n
        \"\"<\/div><\/p>\n
        \u7531\u5e73\u8861\u4e8c\u53c9\u6811\u7684\u6784\u9020\u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\u7b2c\u4e00\u5f20\u56fe\u4e2d\u7684\u4e8c\u53c9\u6811\u5176\u5b9e\u5c31\u662f\u4e00\u68f5\u5e73\u8861\u4e8c\u53c9\u6811\u3002\u5e73\u8861\u4e8c\u53c9\u6811\u4fdd\u8bc1\u4e86\u6811\u7684\u6784\u9020\u662f\u5e73\u8861\u7684\uff0c\u5f53\u6211\u4eec\u63d2\u5165\u6216\u5220\u9664\u6570\u636e\u5bfc\u81f4\u4e0d\u6ee1\u8db3\u5e73\u8861\u4e8c\u53c9\u6811\u4e0d\u5e73\u8861\u65f6\uff0c\u5e73\u8861\u4e8c\u53c9\u6811\u4f1a\u8fdb\u884c\u8c03\u6574\u6811\u4e0a\u7684\u8282\u70b9\u6765\u4fdd\u6301\u5e73\u8861\u3002\u5177\u4f53\u7684\u8c03\u6574\u65b9\u5f0f\u8fd9\u91cc\u5c31\u4e0d\u4ecb\u7ecd\u4e86\u3002\u5e73\u8861\u4e8c\u53c9\u6811\u76f8\u6bd4\u4e8e\u4e8c\u53c9\u67e5\u627e\u6811\u6765\u8bf4\uff0c\u67e5\u627e\u6548\u7387\u66f4\u7a33\u5b9a\uff0c\u603b\u4f53\u7684\u67e5\u627e\u901f\u5ea6\u4e5f\u66f4\u5feb\u3002<\/p>\n
        \u90a3\u4e48\u662f\u4e0d\u662f\u8bf4\u57fa\u4e8e\u5e73\u8861\u4e8c\u53c9\u6811\u6784\u5efa\u7d22\u5f15\u7684\u7ed3\u6784\u5c31\u53ef\u4ee5\u4e86\u5462\uff1f\u7b54\u6848\u662f\u5426\uff01<\/p>\n
        5.4 B\u6811<\/h3>\n
        \u90a3\u4e48\u76f4\u63a5\u7528\u5e73\u8861\u4e8c\u53c9\u6811\u8fd9\u79cd\u6570\u636e\u7ed3\u6784\u6765\u6784\u5efa\u7d22\u5f15\u6709\u4ec0\u4e48\u95ee\u9898\uff1f<\/p>\n
        1\u3001\u9996\u5148\uff0c\u56e0\u4e3a\u5185\u5b58\u7684\u6613\u5931\u6027\u3002\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u90fd\u4f1a\u9009\u62e9\u5c06user\u8868\u4e2d\u7684\u6570\u636e\u548c\u7d22\u5f15\u5b58\u50a8\u5728\u78c1\u76d8\u8fd9\u79cd\u5916\u56f4\u8bbe\u5907\u4e2d\u3002\u4f46\u662f\u548c\u5185\u5b58\u76f8\u6bd4\uff0c\u4ece\u78c1\u76d8\u4e2d\u8bfb\u53d6\u6570\u636e\u7684\u901f\u5ea6\u4f1a\u6162\u4e0a\u767e\u500d\u5343\u500d\u751a\u81f3\u4e07\u500d\uff0c\u6240\u4ee5\uff0c\u6211\u4eec\u5e94\u5f53\u5c3d\u91cf\u51cf\u5c11\u4ece\u78c1\u76d8\u4e2d\u8bfb\u53d6\u6570\u636e\u7684\u6b21\u6570\u3002<\/p>\n
        2\u3001\u53e6\u5916\uff0c\u4ece\u78c1\u76d8\u4e2d\u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u90fd\u662f\u6309\u7167\u78c1\u76d8\u5757\u6765\u8bfb\u53d6\u7684\uff0c\u5e76\u4e0d\u662f\u4e00\u6761\u4e00\u6761\u7684\u8bfb\u3002 \u5982\u679c\u6211\u4eec\u80fd\u628a\u5c3d\u91cf\u591a\u7684\u6570\u636e\u653e\u8fdb\u78c1\u76d8\u5757\u4e2d\uff0c\u90a3\u4e00\u6b21\u78c1\u76d8\u8bfb\u53d6\u64cd\u4f5c\u5c31\u4f1a\u8bfb\u53d6\u66f4\u591a\u6570\u636e\uff0c\u90a3\u6211\u4eec\u67e5\u627e\u6570\u636e\u7684\u65f6\u95f4\u4e5f\u4f1a\u5927\u5e45\u5ea6\u964d\u4f4e\u3002<\/p>\n
        3\u3001\u6240\u4ee5\uff0c\u5982\u679c\u6211\u4eec\u5355\u7eaf\u7528\u5e73\u8861\u4e8c\u53c9\u6811\u8fd9\u79cd\u6570\u636e\u7ed3\u6784\u4f5c\u4e3a\u7d22\u5f15\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5373\u6bcf\u4e2a\u78c1\u76d8\u5757\u53ea\u653e\u4e00\u4e2a\u8282\u70b9\uff0c\u6bcf\u4e2a\u8282\u70b9\u4e2d\u53ea\u5b58\u653e\u4e00\u7ec4\u952e\u503c\u5bf9\uff0c\u6b64\u65f6\u5982\u679c\u6570\u636e\u91cf\u8fc7\u5927\uff0c\u4e8c\u53c9\u6811\u7684\u8282\u70b9\u5219\u4f1a\u975e\u5e38\u591a\uff0c\u6811\u7684\u9ad8\u5ea6\u4e5f\u968f\u5373\u53d8\u9ad8\uff0c\u6211\u4eec\u67e5\u627e\u6570\u636e\u7684\u4e5f\u4f1a\u8fdb\u884c\u5f88\u591a\u6b21\u78c1\u76d8IO\uff0c\u67e5\u627e\u6570\u636e\u7684\u6548\u7387\u4e5f\u4f1a\u53d8\u5f97\u6781\u4f4e\uff01<\/p>\n
        \"\"<\/div><\/p>\n
        \u7efc\u4e0a\uff0c\u5982\u679c\u6211\u4eec\u80fd\u591f\u5728\u5e73\u8861\u4e8c\u53c9\u7684\u6811\u7684\u57fa\u7840\u4e0a\uff0c\u628a\u66f4\u591a\u7684\u8282\u70b9\u653e\u5165\u4e00\u4e2a\u78c1\u76d8\u5757\u4e2d\uff0c\u90a3\u4e48\u5e73\u8861\u4e8c\u53c9\u6811\u7684\u5f0a\u7aef\u4e5f\u5c31\u89e3\u51b3\u4e86\u3002\u5373\u6784\u5efa\u4e00\u4e2a\u5355\u8282\u70b9\u53ef\u4ee5\u5b58\u50a8\u591a\u4e2a\u952e\u503c\u5bf9\u7684\u5e73\u8861\u6811\uff0c\u8fd9\u5c31\u662fB\u6811\u3002<\/p>\n
        B\u6811\uff08Balance Tree\uff09\u5373\u4e3a\u5e73\u8861\u6811\u7684\u610f\u601d\uff0c\u4e0b\u56fe\u5373\u662f\u4e00\u9897B\u6811\u3002<\/p>\n
        \"\"<\/div><\/p>\n
        \u6ce8\u610f\uff1a
        \n\u2013 1\u3001\u56fe\u4e2d\u7684p\u8282\u70b9\u4e3a\u6307\u5411\u5b50\u8282\u70b9\u7684\u6307\u9488\uff0c\u4e8c\u53c9\u67e5\u627e\u6811\u548c\u5e73\u8861\u4e8c\u53c9\u6811\u5176\u5b9e\u4e5f\u6709\uff0c\u56e0\u4e3a\u56fe\u7684\u7f8e\u89c2\u6027\uff0c\u88ab\u7701\u7565\u4e86\u3002<\/p>\n
        \u2013 2\u3001\u56fe\u4e2d\u7684\u6bcf\u4e2a\u8282\u70b9\u91cc\u9762\u653e\u5165\u4e86\u591a\u7ec4\u952e\u503c\u5bf9\uff0c\u4e00\u4e2a\u8282\u70b9\u4e5f\u79f0\u4e3a\u4e00\u9875\uff0c\u4e00\u9875\u5373\u4e00\u4e2a\u78c1\u76d8\u5757\uff0c\u5728mysql\u4e2d\u6570\u636e\u8bfb\u53d6\u7684\u57fa\u672c\u5355\u4f4d\u90fd\u662f\u9875\uff0c\u5373\u4e00\u6b21io\u8bfb\u53d6\u4e00\u4e2a\u9875\u7684\u6570\u636e\uff0c\u6240\u4ee5\u6211\u4eec\u8fd9\u91cc\u53eb\u505a\u9875\u66f4\u7b26\u5408mysql\u4e2d\u7d22\u5f15\u7684\u5e95\u5c42\u6570\u636e\u7ed3\u6784\u3002<\/p><\/blockquote>\n
        \u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u51fa\uff0cB\u6811\u76f8\u5bf9\u4e8e\u5e73\u8861\u4e8c\u53c9\u6811\uff0c\u6bcf\u4e2a\u8282\u70b9\u5b58\u50a8\u4e86\u66f4\u591a\u7684\u952e\u503c(key)\u548c\u6570\u636e(data)\uff0c\u5e76\u4e14\u6bcf\u4e2a\u8282\u70b9\u62e5\u6709\u66f4\u591a\u7684\u5b50\u8282\u70b9\uff0c\u5b50\u8282\u70b9\u7684\u4e2a\u6570\u4e00\u822c\u79f0\u4e3a\u9636\uff0c\u4e0a\u8ff0\u56fe\u4e2d\u7684B\u6811\u4e3a3\u9636B\u6811\uff0c\u9ad8\u5ea6\u4e5f\u4f1a\u5f88\u4f4e\u3002 \u57fa\u4e8e\u8fd9\u4e2a\u7279\u6027\uff0cB\u6811\u67e5\u627e\u6570\u636e\u8bfb\u53d6\u78c1\u76d8\u7684\u6b21\u6570\u5c06\u4f1a\u5f88\u5c11\uff0c\u6570\u636e\u7684\u67e5\u627e\u6548\u7387\u4e5f\u4f1a\u6bd4\u5e73\u8861\u4e8c\u53c9\u6811\u9ad8\u5f88\u591a\u3002
        \n\u5047\u5982\u6211\u4eec\u8981\u67e5\u627eid=28\u7684\u7528\u6237\u4fe1\u606f\uff0c\u90a3\u4e48\u6211\u4eec\u5728\u4e0a\u56feB\u6811\u4e2d\u67e5\u627e\u7684\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n
          \n
        • 1\u3001\u5148\u627e\u5230\u6839\u8282\u70b9\u4e5f\u5c31\u662f\u98751\uff0c\u5224\u65ad28\u5728\u952e\u503c17\u548c35\u4e4b\u95f4\uff0c\u6211\u4eec\u90a3\u4e48\u6211\u4eec\u6839\u636e\u98751\u4e2d\u7684\u6307\u9488p2\u627e\u5230\u98753\u3002<\/li>\n
        • 2\u3001\u5c0628\u548c\u98753\u4e2d\u7684\u952e\u503c\u76f8\u6bd4\u8f83\uff0c28\u572826\u548c30\u4e4b\u95f4\uff0c\u6211\u4eec\u6839\u636e\u98753\u4e2d\u7684\u6307\u9488p2\u627e\u5230\u98758\u3002<\/li>\n
        • 3\u3001\u5c0628\u548c\u98758\u4e2d\u7684\u952e\u503c\u76f8\u6bd4\u8f83\uff0c\u53d1\u73b0\u6709\u5339\u914d\u7684\u952e\u503c28\uff0c\u952e\u503c28\u5bf9\u5e94\u7684\u7528\u6237\u4fe1\u606f\u4e3a(28,bv)\u3002<\/li>\n<\/ul>\n
          \u6ce8\u610f\uff1a<\/p>\n
            \n
          • 1\u3001B\u6811\u7684\u6784\u9020\u662f\u6709\u4e00\u4e9b\u89c4\u5b9a\u7684\uff0c\u4f46\u8fd9\u4e0d\u662f\u672c\u6587\u7684\u5173\u6ce8\u70b9\uff0c\u6709\u5174\u8da3\u7684\u540c\u5b66\u53ef\u4ee5\u4ee4\u884c\u4e86\u89e3\u3002<\/li>\n
          • 2\u3001B\u6811\u4e5f\u662f\u5e73\u8861\u7684\uff0c\u5f53\u589e\u52a0\u6216\u5220\u9664\u6570\u636e\u800c\u5bfc\u81f4B\u6811\u4e0d\u5e73\u8861\u65f6\uff0c\u4e5f\u662f\u9700\u8981\u8fdb\u884c\u8282\u70b9\u8c03\u6574\u7684\u3002<\/li>\n<\/ul>\n
            \u90a3\u4e48B\u6811\u662f\u5426\u5c31\u662f\u7d22\u5f15\u7684\u6700\u7ec8\u7ed3\u6784\u4e86\u5462\uff1f\u7b54\u6848\u662fno\uff0cB\u6811\u53ea\u64c5\u957f\u505a\u7b49\u503c\u67e5\u8be2\uff0c\u800c\u5bf9\u4e8e\u8303\u56f4\u67e5\u8be2\uff08\u8303\u56f4\u67e5\u8be2\u7684\u672c\u8d28\u5c31\u662fn\u6b21\u7b49\u503c\u67e5\u8be2\uff09\uff0c\u6216\u8005\u8bf4\u6392\u5e8f\u64cd\u4f5c\uff0cB\u6811\u4e5f\u5e2e\u4e0d\u4e86\u6211\u4eec<\/p>\n
            select * from user where id=3;  -- \u64c5\u957f\r\nselect * from user where id>3;  -- \u4e0d\u64c5\u957f<\/code><\/pre>\n
            \u4e0a\u5e1d\u8bf4\u8981\u6709\u5149\uff0c\u4e8e\u662f\u6709\u4e86B+\u6811<\/p>\n
            5.5 B+\u6811<\/h3>\n
            B+\u6811\u662f\u5bf9B\u6811\u7684\u8fdb\u4e00\u6b65\u4f18\u5316\u3002\u8ba9\u6211\u4eec\u5148\u6765\u770b\u4e0bB+\u6811\u7684\u7ed3\u6784\u56fe\uff1a<\/p>\n
            \"\"<\/div><\/p>\n
            \u6839\u636e\u4e0a\u56fe\u6211\u4eec\u6765\u770b\u4e0bB+\u6811\u548cB\u6811\u6709\u4ec0\u4e48\u4e0d\u540c\u3002<\/p>\n
            1\u3001B+\u6811\u975e\u53f6\u5b50\u8282\u70b9non-leaf node\u4e0a\u662f\u4e0d\u5b58\u50a8\u6570\u636e\u7684\uff0c\u4ec5\u5b58\u50a8\u952e\uff0c\u800cB\u6811\u7684\u975e\u53f6\u5b50\u8282\u70b9\u4e2d\u4e0d\u4ec5\u5b58\u50a8\u952e\uff0c\u4e5f\u4f1a\u5b58\u50a8\u6570\u636e\u3002B+\u6811\u4e4b\u6240\u4ee5\u8fd9\u4e48\u505a\u7684\u610f\u4e49\u5728\u4e8e\uff1a\u6811\u4e00\u4e2a\u8282\u70b9\u5c31\u662f\u4e00\u4e2a\u9875\uff0c\u800c\u6570\u636e\u5e93\u4e2d\u9875\u7684\u5927\u5c0f\u662f\u56fa\u5b9a\u7684\uff0cinnodb\u5b58\u50a8\u5f15\u64ce\u9ed8\u8ba4\u4e00\u9875\u4e3a16KB\uff0c\u6240\u4ee5\u5728\u9875\u5927\u5c0f\u56fa\u5b9a\u7684\u524d\u63d0\u4e0b\uff0c\u80fd\u5f80\u4e00\u4e2a\u9875\u4e2d\u653e\u5165\u66f4\u591a\u7684\u8282\u70b9\uff0c\u76f8\u5e94\u7684\u6811\u7684\u9636\u6570\uff08\u8282\u70b9\u7684\u5b50\u8282\u70b9\u6811\uff09\u5c31\u4f1a\u66f4\u5927\uff0c\u90a3\u4e48\u6811\u7684\u9ad8\u5ea6\u5fc5\u7136\u66f4\u77ee\u66f4\u80d6\uff0c\u5982\u6b64\u4e00\u6765\u6211\u4eec\u67e5\u627e\u6570\u636e\u8fdb\u884c\u78c1\u76d8\u7684IO\u6b21\u6570\u6709\u4f1a\u518d\u6b21\u51cf\u5c11\uff0c\u6570\u636e\u67e5\u8be2\u7684\u6548\u7387\u4e5f\u4f1a\u66f4\u5feb\u3002<\/p>\n
            2\u3001B+\u6811\u7684\u9636\u6570\u662f\u7b49\u4e8e\u952e\u7684\u6570\u91cf\u7684\uff0c\u4f8b\u5982\u4e0a\u56fe\uff0c\u6211\u4eec\u7684B+\u6811\u4e2d\u6bcf\u4e2a\u8282\u70b9\u53ef\u4ee5\u5b58\u50a83\u4e2a\u952e\uff0c3\u5c42B+\u6811\u5b58\u53ef\u4ee5\u5b58\u50a83*3*3<\/code>=9\u4e2a\u6570\u636e\u3002\u6240\u4ee5\u5982\u679c\u6211\u4eec\u7684B+\u6811\u4e00\u4e2a\u8282\u70b9\u53ef\u4ee5\u5b58\u50a81000\u4e2a\u952e\u503c\uff0c\u90a3\u4e483\u5c42B+\u6811\u53ef\u4ee5\u5b58\u50a81000\u00d71000\u00d71000=10\u4ebf\u4e2a\u6570\u636e\u3002\u800c\u4e00\u822c\u6839\u8282\u70b9\u662f\u5e38\u9a7b\u5185\u5b58\u7684\uff0c\u6240\u4ee5\u4e00\u822c\u6211\u4eec\u67e5\u627e10\u4ebf\u6570\u636e\uff0c\u53ea\u9700\u89812\u6b21\u78c1\u76d8IO\uff0c\u771f\u662f\u5c4c\u70b8\u5929\u7684\u8bbe\u8ba1\u3002<\/p>\n
            3\u3001\u56e0\u4e3aB+\u6811\u7d22\u5f15\u7684\u6240\u6709\u6570\u636e\u5747\u5b58\u50a8\u5728\u53f6\u5b50\u8282\u70b9leaf node\uff0c\u800c\u4e14\u6570\u636e\u662f\u6309\u7167\u987a\u5e8f\u6392\u5217\u7684\u3002\u90a3\u4e48B+\u6811\u4f7f\u5f97\u8303\u56f4\u67e5\u627e\uff0c\u6392\u5e8f\u67e5\u627e\uff0c\u5206\u7ec4\u67e5\u627e\u4ee5\u53ca\u53bb\u91cd\u67e5\u627e\u53d8\u5f97\u5f02\u5e38\u7b80\u5355\u3002\u800cB\u6811\u56e0\u4e3a\u6570\u636e\u5206\u6563\u5728\u5404\u4e2a\u8282\u70b9\uff0c\u8981\u5b9e\u73b0\u8fd9\u4e00\u70b9\u662f\u5f88\u4e0d\u5bb9\u6613\u7684\u3002
            \n\u800c\u4e14B+\u6811\u4e2d\u5404\u4e2a\u9875\u4e4b\u95f4\u4e5f\u662f\u901a\u8fc7\u53cc\u5411\u94fe\u8868\u8fde\u63a5\u7684\uff0c\u53f6\u5b50\u8282\u70b9\u4e2d\u7684\u6570\u636e\u662f\u901a\u8fc7\u5355\u5411\u94fe\u8868\u8fde\u63a5\u7684\u3002\u5176\u5b9e\u4e0a\u9762\u7684B\u6811\u6211\u4eec\u4e5f\u53ef\u4ee5\u5bf9\u5404\u4e2a\u8282\u70b9\u52a0\u4e0a\u94fe\u8868\u3002\u5176\u5b9e\u8fd9\u4e9b\u4e0d\u662f\u5b83\u4eec\u4e4b\u524d\u7684\u533a\u522b\uff0c\u662f\u56e0\u4e3a\u5728mysql\u7684innodb\u5b58\u50a8\u5f15\u64ce\u4e2d\uff0c\u7d22\u5f15\u5c31\u662f\u8fd9\u6837\u5b58\u50a8\u7684\u3002\u4e5f\u5c31\u662f\u8bf4\u4e0a\u56fe\u4e2d\u7684B+\u6811\u7d22\u5f15\u5c31\u662finnodb\u4e2dB+\u6811\u7d22\u5f15\u771f\u6b63\u7684\u5b9e\u73b0\u65b9\u5f0f\uff0c\u51c6\u786e\u7684\u8bf4\u5e94\u8be5\u662f\u805a\u96c6\u7d22\u5f15\uff08\u805a\u96c6\u7d22\u5f15\u548c\u975e\u805a\u96c6\u7d22\u5f15\u4e0b\u9762\u4f1a\u8bb2\u5230\uff09\u3002<\/p>\n
            \u901a\u8fc7\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c\u5728innodb\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7\u6570\u636e\u9875\u4e4b\u95f4\u901a\u8fc7\u53cc\u5411\u94fe\u8868\u8fde\u63a5\u4ee5\u53ca\u53f6\u5b50\u8282\u70b9\u4e2d\u6570\u636e\u4e4b\u95f4\u901a\u8fc7\u5355\u5411\u94fe\u8868\u8fde\u63a5\u7684\u65b9\u5f0f\u53ef\u4ee5\u627e\u5230\u8868\u4e2d\u6240\u6709\u7684\u6570\u636e\u3002<\/p>\n
            MyISAM\u4e2d\u7684B+\u6811\u7d22\u5f15\u5b9e\u73b0\u4e0einnodb\u4e2d\u7684\u7565\u6709\u4e0d\u540c\u3002\u5728MyISAM\u4e2d\uff0cB+\u6811\u7d22\u5f15\u7684\u53f6\u5b50\u8282\u70b9\u5e76\u4e0d\u5b58\u50a8\u6570\u636e\uff0c\u800c\u662f\u5b58\u50a8\u6570\u636e\u7684\u6587\u4ef6\u5730\u5740\u3002<\/p><\/blockquote>\n
            \u516d \u805a\u96c6\u7d22\u5f15\u4e8e\u975e\u805a\u96c6\u7d22\u5f15<\/h2>\n
            6.1 \u4ec0\u4e48\u662f\u805a\u96c6\u7d22\u5f15\uff0c\u4ec0\u4e48\u662f\u975e\u805a\u96c6\u7d22\u5f15<\/h3>\n
            \u5728\u4e0a\u8282\u4ecb\u7ecdB+\u6811\u7d22\u5f15\u7684\u65f6\u5019\uff0c\u6211\u4eec\u63d0\u5230\u4e86\u56fe\u4e2d\u7684\u7d22\u5f15\u5176\u5b9e\u662f\u805a\u96c6\u7d22\u5f15\u7684\u5b9e\u73b0\u65b9\u5f0f\u3002\u90a3\u4ec0\u4e48\u662f\u805a\u96c6\u7d22\u5f15\u5462\uff1f\u4ec0\u4e48\u662f\u53c8\u662f\u975e\u805a\u96c6\u7d22\u5f15\u5462\uff1f<\/p>\n
            \u5728MySQL\u4e2d\uff0cB+\u6811\u7d22\u5f15\u6309\u7167\u5b58\u50a8\u65b9\u5f0f\u7684\u4e0d\u540c\u5206\u4e3a\u805a\u96c6\u7d22\u5f15\u548c\u975e\u805a\u96c6\u7d22\u5f15\u3002\u8fd9\u91cc\u6211\u4eec\u4e3b\u8981\u4ecb\u7ecdinnodb\u5b58\u50a8\u5f15\u64ce\u4e2d\u7684\u805a\u96c6\u7d22\u5f15\u548c\u975e\u805a\u96c6\u7d22\u5f15\u3002<\/p>\n
            1\u3001\u805a\u96c6\u7d22\u5f15\uff08\u53c8\u79f0\u805a\u7c07\u7d22\u5f15\u3001\u4e3b\u952e\u7d22\u5f15\uff0c\u4e00\u5f20\u8868\u5fc5\u987b\u6709\u4e14\u53ea\u6709\u4e00\u4e2a\uff09\uff1a\u4ee5innodb\u4f5c\u4e3a\u5b58\u50a8\u5f15\u64ce\u7684\u8868\uff0c\u8868\u4e2d\u7684\u6570\u636e\u90fd\u4f1a\u6709\u4e00\u4e2a\u4e3b\u952e\uff0c\u5373\u4f7f\u4f60\u4e0d\u521b\u5efa\u4e3b\u952e\uff0c\u7cfb\u7edf\u4e5f\u4f1a\u5e2e\u4f60\u521b\u5efa\u4e00\u4e2a\u9690\u5f0f\u7684\u4e3b\u952e\u3002\u8fd9\u662f\u56e0\u4e3ainnodb\u662f\u628a\u6570\u636e\u5b58\u653e\u5728B+\u6811\u4e2d\u7684\uff0c\u800cB+\u6811\u7684\u952e\u7528\u7684\u5c31\u662f\u4e3b\u952e\uff0c\u5728B+\u6811\u7684\u53f6\u5b50\u8282\u70b9\u4e2d\uff0c\u5b58\u50a8\u4e86\u8868\u4e2d\u6240\u6709\u7684\u6570\u636e\u3002\u8fd9\u79cd\u4ee5\u4e3b\u952e\u4f5c\u4e3aB+\u6811\u7d22\u5f15\u7684\u952e\u503c\u800c\u6784\u5efa\u7684B+\u6811\u7d22\u5f15\uff0c\u6211\u4eec\u79f0\u4e4b\u4e3a\u805a\u96c6\u7d22\u5f15\u3002<\/p>\n
            2\u3001\u975e\u805a\u96c6\u7d22\u5f15\uff08\u53c8\u79f0\u975e\u805a\u7c07\u7d22\u5f15\u3001\u8f85\u52a9\u7d22\u5f15\uff0c\u4e00\u5f20\u8868\u53ef\u4ee5\u521b\u5efa\u591a\u4e2a\u8f85\u52a9\u7d22\u5f15\uff09\uff1a\u4ee5\u4e3b\u952e\u4ee5\u5916\u7684\u5217\u503c\u4f5c\u4e3a\u952e\u503c\u6784\u5efa\u7684B+\u6811\u7d22\u5f15\uff0c\u6211\u4eec\u79f0\u4e4b\u4e3a\u975e\u805a\u96c6\u7d22\u5f15\u3002\u975e\u805a\u96c6\u7d22\u5f15\u4e0e\u805a\u96c6\u7d22\u5f15\u7684\u533a\u522b\u5728\u4e8e\u975e\u805a\u96c6\u7d22\u5f15\u7684\u53f6\u5b50\u8282\u70b9\u4e0d\u5b58\u50a8\u8868\u4e2d\u7684\u6570\u636e\uff0c\u800c\u662f\u5b58\u50a8\u8be5\u5217\u5bf9\u5e94\u7684\u4e3b\u952e\uff0c\u60f3\u8981\u67e5\u627e\u6570\u636e\u6211\u4eec\u8fd8\u9700\u8981\u6839\u636e\u4e3b\u952e\u518d\u53bb\u805a\u96c6\u7d22\u5f15\u4e2d\u8fdb\u884c\u67e5\u627e\uff0c\u8fd9\u4e2a\u518d\u6839\u636e\u805a\u96c6\u7d22\u5f15\u67e5\u627e\u6570\u636e\u7684\u8fc7\u7a0b\uff0c\u6211\u4eec\u79f0\u4e3a\u56de\u8868\u3002
            \n\u660e\u767d\u4e86\u805a\u96c6\u7d22\u5f15\u548c\u975e\u805a\u96c6\u7d22\u5f15\u7684\u5b9a\u4e49\uff0c\u6211\u4eec\u5e94\u8be5\u660e\u767d\u8fd9\u6837\u4e00\u53e5\u8bdd\uff1a\u6570\u636e\u5373\u7d22\u5f15\uff0c\u7d22\u5f15\u5373\u6570\u636e\u3002<\/p>\n
            6.2 \u5229\u7528\u805a\u96c6\u7d22\u5f15\u548c\u975e\u805a\u96c6\u7d22\u5f15\u67e5\u627e\u6570\u636e<\/h3>\n
            \u524d\u9762\u6211\u4eec\u8bb2\u89e3B+\u6811\u7d22\u5f15\u7684\u65f6\u5019\u5e76\u6ca1\u6709\u53bb\u8bf4\u600e\u4e48\u5728B+\u6811\u4e2d\u8fdb\u884c\u6570\u636e\u7684\u67e5\u627e\uff0c\u4e3b\u8981\u5c31\u662f\u56e0\u4e3a\u8fd8\u6ca1\u6709\u5f15\u51fa\u805a\u96c6\u7d22\u5f15\u548c\u975e\u805a\u96c6\u7d22\u5f15\u7684\u6982\u5ff5\u3002\u4e0b\u9762\u6211\u4eec\u901a\u8fc7\u8bb2\u89e3\u5982\u4f55\u901a\u8fc7\u805a\u96c6\u7d22\u5f15\u4ee5\u53ca\u975e\u805a\u96c6\u7d22\u5f15\u67e5\u627e\u6570\u636e\u8868\u4e2d\u6570\u636e\u7684\u65b9\u5f0f\u4ecb\u7ecd\u4e00\u4e0bB+\u6811\u7d22\u5f15\u67e5\u627e\u6570\u636e\u65b9\u6cd5\u3002<\/p>\n
            6.2.1 \u5229\u7528\u805a\u96c6\u7d22\u5f15\u67e5\u627e\u6570\u636e<\/h4>\n
            \"\"<\/div><\/p>\n
            \u8fd8\u662f\u8fd9\u5f20B+\u6811\u7d22\u5f15\u56fe\uff0c\u73b0\u5728\u6211\u4eec\u5e94\u8be5\u77e5\u9053\u8fd9\u5c31\u662f\u805a\u96c6\u7d22\u5f15\uff0c\u8868\u4e2d\u7684\u6570\u636e\u5b58\u50a8\u5728\u5176\u4e2d\u3002\u73b0\u5728\u5047\u8bbe\u6211\u4eec\u8981\u67e5\u627eid>=18\u5e76\u4e14id<40\u7684\u7528\u6237\u6570\u636e\u3002\u5bf9\u5e94\u7684sql\u8bed\u53e5\u4e3a<\/p>\n
            select * from user where id>=18 and id <40\uff0c<\/code><\/pre>\n
            \u5176\u4e2did\u4e3a\u4e3b\u952e\u3002\u5177\u4f53\u7684\u67e5\u627e\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n
            1\u3001\u4e00\u822c\u6839\u8282\u70b9\u90fd\u662f\u5e38\u9a7b\u5185\u5b58\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u98751\u5df2\u7ecf\u5728\u5185\u5b58\u4e2d\u4e86\uff0c\u6b64\u65f6\u4e0d\u9700\u8981\u5230\u78c1\u76d8\u4e2d\u8bfb\u53d6\u6570\u636e\uff0c\u76f4\u63a5\u4ece\u5185\u5b58\u4e2d\u8bfb\u53d6\u5373\u53ef\u3002\u4ece\u5185\u5b58\u4e2d\u8bfb\u53d6\u5230\u98751\uff0c\u8981\u67e5\u627e\u8fd9\u4e2aid>=18 and id <40\u6216\u8005\u8303\u56f4\u503c\uff0c\u6211\u4eec\u9996\u5148\u9700\u8981\u627e\u5230id=18\u7684\u952e\u503c\u3002\u4ece\u98751\u4e2d\u6211\u4eec\u53ef\u4ee5\u627e\u5230\u952e\u503c18\uff0c\u6b64\u65f6\u6211\u4eec\u9700\u8981\u6839\u636e\u6307\u9488p2\uff0c\u5b9a\u4f4d\u5230\u98753\u3002<\/p>\n
            2\u3001\u8981\u4ece\u98753\u4e2d\u67e5\u627e\u6570\u636e\uff0c\u6211\u4eec\u5c31\u9700\u8981\u62ff\u7740p2\u6307\u9488\u53bb\u78c1\u76d8\u4e2d\u8fdb\u884c\u8bfb\u53d6\u98753\u3002\u4ece\u78c1\u76d8\u4e2d\u8bfb\u53d6\u98753\u540e\u5c06\u98753\u653e\u5165\u5185\u5b58\u4e2d\uff0c\u7136\u540e\u8fdb\u884c\u67e5\u627e\uff0c\u6211\u4eec\u53ef\u4ee5\u627e\u5230\u952e\u503c18\uff0c\u7136\u540e\u518d\u62ff\u5230\u98753\u4e2d\u7684\u6307\u9488p1\uff0c\u5b9a\u4f4d\u5230\u98758\u3002<\/p>\n
            3\u3001\u540c\u6837\u7684\u98758\u9875\u4e0d\u5728\u5185\u5b58\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u518d\u53bb\u78c1\u76d8\u4e2d\u5c06\u98758\u8bfb\u53d6\u5230\u5185\u5b58\u4e2d\u3002\u5c06\u98758\u8bfb\u53d6\u5230\u5185\u5b58\u4e2d\u540e\u3002\u56e0\u4e3a\u9875\u4e2d\u7684\u6570\u636e\u662f\u94fe\u8868\u8fdb\u884c\u8fde\u63a5\u7684\uff0c\u800c\u4e14\u952e\u503c\u662f\u6309\u7167\u987a\u5e8f\u5b58\u653e\u7684\uff0c\u6b64\u65f6\u53ef\u4ee5\u6839\u636e\u4e8c\u5206\u67e5\u627e\u6cd5\u5b9a\u4f4d\u5230\u952e\u503c18\u3002\u6b64\u65f6\u56e0\u4e3a\u5df2\u7ecf\u5230\u6570\u636e\u9875\u4e86\uff0c\u6b64\u65f6\u6211\u4eec\u5df2\u7ecf\u627e\u5230\u4e00\u6761\u6ee1\u8db3\u6761\u4ef6\u7684\u6570\u636e\u4e86\uff0c\u5c31\u662f\u952e\u503c18\u5bf9\u5e94\u7684\u6570\u636e\u3002\u56e0\u4e3a\u662f\u8303\u56f4\u67e5\u627e\uff0c\u800c\u4e14\u6b64\u65f6\u6240\u6709\u7684\u6570\u636e\u53c8\u90fd\u5b58\u5728\u53f6\u5b50\u8282\u70b9\uff0c\u5e76\u4e14\u662f\u6709\u5e8f\u6392\u5217\u7684\uff0c\u90a3\u4e48\u6211\u4eec\u5c31\u53ef\u4ee5\u5bf9\u98758\u4e2d\u7684\u952e\u503c\u4f9d\u6b21\u8fdb\u884c\u904d\u5386\u67e5\u627e\u5e76\u5339\u914d\u6ee1\u8db3\u6761\u4ef6\u7684\u6570\u636e\u3002\u6211\u4eec\u53ef\u4ee5\u4e00\u76f4\u627e\u5230\u952e\u503c\u4e3a22\u7684\u6570\u636e\uff0c\u7136\u540e\u98758\u4e2d\u5c31\u6ca1\u6709\u6570\u636e\u4e86\uff0c\u6b64\u65f6\u6211\u4eec\u9700\u8981\u62ff\u7740\u98758\u4e2d\u7684p\u6307\u9488\u53bb\u8bfb\u53d6\u98759\u4e2d\u7684\u6570\u636e\u3002<\/p>\n
            4\u3001\u56e0\u4e3a\u98759\u4e0d\u5728\u5185\u5b58\u4e2d\uff0c\u5c31\u53c8\u4f1a\u52a0\u8f7d\u98759\u5230\u5185\u5b58\u4e2d\uff0c\u5e76\u901a\u8fc7\u548c\u98758\u4e2d\u4e00\u6837\u7684\u65b9\u5f0f\u8fdb\u884c\u6570\u636e\u7684\u67e5\u627e\uff0c\u76f4\u5230\u5c06\u987512\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\uff0c\u53d1\u73b041\u5927\u4e8e40\uff0c\u6b64\u65f6\u4e0d\u6ee1\u8db3\u6761\u4ef6\u3002\u90a3\u4e48\u67e5\u627e\u5230\u6b64\u7ec8\u6b62\u3002\u6700\u7ec8\u6211\u4eec\u627e\u5230\u6ee1\u8db3\u6761\u4ef6\u7684\u6240\u6709\u6570\u636e\u4e3a\uff1a(18,kl),(19,kl),(22,hj),(24,io),(25,vg),(29,jk),(31,jk),(33,rt),(34,ty),(35,yu),(37,rt),(39,rt)\u3002\u603b\u517112\u6761\u8bb0\u5f55\u3002<\/p>\n
            \u4e0b\u9762\u770b\u4e0b\u5177\u4f53\u7684\u67e5\u627e\u6d41\u7a0b\u56fe\uff1a
            \n
            <\/div>
            \u67e5\u770b\u66f4\u591a<\/h2>
            \u8054\u7cfb\u7ba1\u7406\u5458\u5fae\u4fe1tutu19192010\uff0c\u6ce8\u518c\u8d26\u53f7<\/p>\n<\/div>
            <\/div>
            <\/td><\/tr>
            <\/td><\/tr><\/tbody><\/table>
            		<\/td><\/tr><\/tbody><\/table><\/form>
            Register<\/a><\/div>
            Forgotten username or password?<\/a><\/div>
            <\/div><\/div><\/div>
            <\/div>","protected":false},"excerpt":{"rendered":"
            \u7d22\u5f15\u539f\u7406\u4e0e\u6162\u67e5\u8be2\u4f18\u5316 \u4e00 \u6211\u4eec\u8981\u641e\u660e\u767d\u7684\u95ee\u9898 \u8ba9\u6211\u4eec\u5e26\u7740\u4ee5\u4e0b\u95ee\u9898\u5c55\u5f00\u5bf9\u7d22\u5f15\u7684\u63a2\u7d22 1\u3001\u4e3a\u4f55\u7d22\u5f15\u53ebkey 2\u3001\u7d22 […]<\/p>\n","protected":false},"author":3,"featured_media":501,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[83],"tags":[21,19,99,22,100,20],"_links":{"self":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/500"}],"collection":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=500"}],"version-history":[{"count":4,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/500\/revisions"}],"predecessor-version":[{"id":11502,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/500\/revisions\/11502"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/media\/501"}],"wp:attachment":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=500"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=500"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=500"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}