{"id":1619,"date":"2022-11-20T23:10:04","date_gmt":"2022-11-20T15:10:04","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1619"},"modified":"2022-11-27T12:40:57","modified_gmt":"2022-11-27T04:40:57","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95%e5%8f%8a%e7%b4%a2%e5%bc%95%e7%9a%84%e4%bc%98%e7%bc%ba%e7%82%b9%e3%80%81%e4%b8%80%e4%b8%aa%e7%ae%80%e5%8d%95%e7%9a%84%e7%b4%a2%e5%bc%95","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1619","title":{"rendered":"\u4e3a\u4ec0\u4e48\u4f7f\u7528\u7d22\u5f15\u53ca\u7d22\u5f15\u7684\u4f18\u7f3a\u70b9\u3001\u4e00\u4e2a\u7b80\u5355\u7684\u7d22\u5f15\u8bbe\u8ba1\u65b9\u6848\u3001\u7d22\u5f15\u7684\u8fed\u4ee3\u8bbe\u8ba1\u65b9\u6848\u3001\u805a\u7c07\u7d22\u5f15\u3001\u4e8c\u7ea7\u7d22\u5f15\u4e0e\u8054\u5408\u7d22\u5f15\u7684\u6982\u5ff5\u3001InnoDB\u4e2dB+\u6811\u6ce8\u610f\u4e8b\u9879_MyISAM\u7684\u7d22\u5f15\u65b9\u6848\u3001Hash\u7d22\u5f15\u3001AVL\u6811\u3001B\u6811\u4e0eB+\u6811\u5bf9\u6bd4"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code># \u7b2c06\u7ae0_\u7d22\u5f15\u7684\u6570\u636e\u7ed3\u6784\r\n\r\n# 2. \u7d22\u5f15\u53ca\u5176\u4f18\u7f3a\u70b9\r\n\r\n# 2.1 \u7d22\u5f15\u6982\u8ff0\r\n# MySQL\u5b98\u65b9\u5bf9\u7d22\u5f15\u7684\u5b9a\u4e49\u4e3a\uff1a\u7d22\u5f15\uff08Index\uff09\u662f\u5e2e\u52a9MySQL\u9ad8\u6548\u83b7\u53d6\u6570\u636e\u7684\u6570\u636e\u7ed3\u6784\u3002\r\n\r\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\r\n# \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\r\n\r\n# 2.2 \u4f18\u70b9\r\n# \uff081\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 \uff0c\u8fd9\u4e5f\u662f\u521b\u5efa\u7d22\u5f15\u6700\u4e3b\u8981\u7684\u539f\u56e0\u3002\r\n# \uff082\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 \u3002\r\n# \uff083\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\r\n# \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\r\n# \uff084\uff09\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\r\n\r\n# 3. InnoDB\u4e2d\u7d22\u5f15\u7684\u63a8\u6f14\r\n\r\nSHOW DATABASES;\r\n\r\nUSE atguigudb;\r\n\r\nSELECT * FROM employees;\r\n\r\n# 3.1 \u7d22\u5f15\u4e4b\u524d\u7684\u67e5\u627e\r\n# \u5148\u6765\u770b\u4e00\u4e2a\u7cbe\u786e\u5339\u914d\u7684\u4f8b\u5b50\uff1a\r\n# SELECT &#91;\u5217\u540d\u5217\u8868] FROM \u8868\u540d WHERE \u5217\u540d = xxx;\r\n\r\n# 1. \u5728\u4e00\u4e2a\u9875\u4e2d\u7684\u67e5\u627e\r\n\r\n# 2. \u5728\u5f88\u591a\u9875\u4e2d\u67e5\u627e\r\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\r\n# \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\r\n# \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\r\n# \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\r\n\r\n# 3.2 \u8bbe\u8ba1\u7d22\u5f15 \u89c1\u8bfe\u4ef6\r\n\r\n# 3.3 \u5e38\u89c1\u7d22\u5f15\u6982\u5ff5\r\n# \u7d22\u5f15\u6309\u7167\u7269\u7406\u5b9e\u73b0\u65b9\u5f0f\uff0c\u7d22\u5f15\u53ef\u4ee5\u5206\u4e3a 2 \u79cd\uff1a\u805a\u7c07\uff08\u805a\u96c6\uff09\u548c\u975e\u805a\u7c07\uff08\u975e\u805a\u96c6\uff09\u7d22\u5f15\u3002\r\n# \u6211\u4eec\u4e5f\u628a\u975e\u805a\u96c6\u7d22\u5f15\u79f0\u4e3a\u4e8c\u7ea7\u7d22\u5f15\u6216\u8005\u8f85\u52a9\u7d22\u5f15\u3002\r\n\r\n# 1. \u805a\u7c07\u7d22\u5f15\r\n\r\n# \u7279\u70b9\uff1a\r\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\r\n#     \u9875\u5185 \u7684\u8bb0\u5f55\u662f\u6309\u7167\u4e3b\u952e\u7684\u5927\u5c0f\u987a\u5e8f\u6392\u6210\u4e00\u4e2a \u5355\u5411\u94fe\u8868 \u3002\r\n#     \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\r\n#     \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\r\n\r\n# 2. B+\u6811\u7684 \u53f6\u5b50\u8282\u70b9 \u5b58\u50a8\u7684\u662f\u5b8c\u6574\u7684\u7528\u6237\u8bb0\u5f55\u3002\r\n#     \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\r\n\r\n# \u4f18\u70b9\uff1a\r\n#     \u6570\u636e\u8bbf\u95ee\u66f4\u5feb \uff0c\u56e0\u4e3a\u805a\u7c07\u7d22\u5f15\u5c06\u7d22\u5f15\u548c\u6570\u636e\u4fdd\u5b58\u5728\u540c\u4e00\u4e2aB+\u6811\u4e2d\uff0c\u56e0\u6b64\u4ece\u805a\u7c07\u7d22\u5f15\u4e2d\u83b7\u53d6\u6570\u636e\u6bd4\u975e\u805a\u7c07\u7d22\u5f15\u66f4\u5feb\r\n#     \u805a\u7c07\u7d22\u5f15\u5bf9\u4e8e\u4e3b\u952e\u7684 \u6392\u5e8f\u67e5\u627e \u548c \u8303\u56f4\u67e5\u627e \u901f\u5ea6\u975e\u5e38\u5feb\r\n#     \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\r\n# \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 \u3002\r\n\r\n# \u7f3a\u70b9\uff1a\r\n# \u63d2\u5165\u901f\u5ea6\u4e25\u91cd\u4f9d\u8d56\u4e8e\u63d2\u5165\u987a\u5e8f \uff0c\u6309\u7167\u4e3b\u952e\u7684\u987a\u5e8f\u63d2\u5165\u662f\u6700\u5feb\u7684\u65b9\u5f0f\uff0c\u5426\u5219\u5c06\u4f1a\u51fa\u73b0\u9875\u5206\u88c2\uff0c\r\n# \u4e25\u91cd\u5f71\u54cd\u6027\u80fd\u3002\u56e0\u6b64\uff0c\u5bf9\u4e8eInnoDB\u8868\uff0c\u6211\u4eec\u4e00\u822c\u90fd\u4f1a\u5b9a\u4e49\u4e00\u4e2a\u81ea\u589e\u7684ID\u5217\u4e3a\u4e3b\u952e\r\n#     \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\r\n#     \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\r\n\r\n# 2. \u4e8c\u7ea7\u7d22\u5f15\uff08\u8f85\u52a9\u7d22\u5f15\u3001\u975e\u805a\u7c07\u7d22\u5f15\uff09\r\n\r\n# \u6982\u5ff5\uff1a\u56de\u8868 \u6211\u4eec\u6839\u636e\u8fd9\u4e2a\u4ee5c2\u5217\u5927\u5c0f\u6392\u5e8f\u7684B+\u6811\u53ea\u80fd\u786e\u5b9a\u6211\u4eec\u8981\u67e5\u627e\u8bb0\u5f55\u7684\u4e3b\u952e\u503c\uff0c\r\n# \u6240\u4ee5\u5982\u679c\u6211\u4eec\u60f3\u6839\u636ec2\u5217\u7684\u503c\u67e5\u627e\u5230\u5b8c\u6574\u7684\u7528\u6237\u8bb0\u5f55\u7684\u8bdd\uff0c\u4ecd\u7136\u9700\u8981\u5230 \u805a\u7c07\u7d22\u5f15 \u4e2d\u518d\u67e5\u4e00\u904d\uff0c\r\n# \u8fd9\u4e2a\u8fc7\u7a0b\u79f0\u4e3a \u56de\u8868 \u3002\u4e5f\u5c31\u662f\u6839\u636ec2\u5217\u7684\u503c\u67e5\u8be2\u4e00\u6761\u5b8c\u6574\u7684\u7528\u6237\u8bb0\u5f55\u9700\u8981\u4f7f\u7528\u5230 2 \u68f5B+\u6811\uff01\r\n\r\n# 3. \u8054\u5408\u7d22\u5f15\r\n# \u6211\u4eec\u4e5f\u53ef\u4ee5\u540c\u65f6\u4ee5\u591a\u4e2a\u5217\u7684\u5927\u5c0f\u4f5c\u4e3a\u6392\u5e8f\u89c4\u5219\uff0c\u4e5f\u5c31\u662f\u540c\u65f6\u4e3a\u591a\u4e2a\u5217\u5efa\u7acb\u7d22\u5f15\uff0c\r\n# \u6bd4\u65b9\u8bf4\u6211\u4eec\u60f3\u8ba9B+\u6811\u6309\u7167 c2\u548cc3\u5217 \u7684\u5927\u5c0f\u8fdb\u884c\u6392\u5e8f\uff0c\u8fd9\u4e2a\u5305\u542b\u4e24\u5c42\u542b\u4e49\uff1a\r\n#     \u5148\u628a\u5404\u4e2a\u8bb0\u5f55\u548c\u9875\u6309\u7167c2\u5217\u8fdb\u884c\u6392\u5e8f\u3002\r\n#     \u5728\u8bb0\u5f55\u7684c2\u5217\u76f8\u540c\u7684\u60c5\u51b5\u4e0b\uff0c\u91c7\u7528c3\u5217\u8fdb\u884c\u6392\u5e8f\r\n\r\n# \u6ce8\u610f\u4e00\u70b9\uff0c\u4ee5c2\u548cc3\u5217\u7684\u5927\u5c0f\u4e3a\u6392\u5e8f\u89c4\u5219\u5efa\u7acb\u7684B+\u6811\u79f0\u4e3a \u8054\u5408\u7d22\u5f15 \uff0c\u672c\u8d28\u4e0a\u4e5f\u662f\u4e00\u4e2a\u4e8c\u7ea7\u7d22\u5f15\u3002\r\n# \u5b83\u7684\u610f\u601d\u4e0e\u5206\u522b\u4e3ac2\u548cc3\u5217\u5206\u522b\u5efa\u7acb\u7d22\u5f15\u7684\u8868\u8ff0\u662f\u4e0d\u540c\u7684\uff0c\u4e0d\u540c\u70b9\u5982\u4e0b\uff1a\r\n#     \u5efa\u7acb \u8054\u5408\u7d22\u5f15 \u53ea\u4f1a\u5efa\u7acb\u5982\u4e0a\u56fe\u4e00\u6837\u76841\u68f5B+\u6811\u3002\r\n#     \u4e3ac2\u548cc3\u5217\u5206\u522b\u5efa\u7acb\u7d22\u5f15\u4f1a\u5206\u522b\u4ee5c2\u548cc3\u5217\u7684\u5927\u5c0f\u4e3a\u6392\u5e8f\u89c4\u5219\u5efa\u7acb2\u68f5B+\u6811\u3002\r\n\r\n# 3.4 InnoDB\u7684B+\u6811\u7d22\u5f15\u7684\u6ce8\u610f\u4e8b\u9879\r\n\r\n# 1. \u6839\u9875\u9762\u4f4d\u7f6e\u4e07\u5e74\u4e0d\u52a8\r\n# 2. \u5185\u8282\u70b9\u4e2d\u76ee\u5f55\u9879\u8bb0\u5f55\u7684\u552f\u4e00\u6027\r\n# 3. \u4e00\u4e2a\u9875\u9762\u6700\u5c11\u5b58\u50a82\u6761\u8bb0\u5f55\r\n\r\n# 4. MyISAM\u4e2d\u7684\u7d22\u5f15\u65b9\u6848\r\n# \u7d22\u5f15 \/ \u5b58\u50a8\u5f15\u64ce       MyISAM      InnoDB      Memory\r\n# B-Tree\u7d22\u5f15            \u652f\u6301         \u652f\u6301        \u652f\u6301\r\n# \u5373\u4f7f\u591a\u4e2a\u5b58\u50a8\u5f15\u64ce\u652f\u6301\u540c\u4e00\u79cd\u7c7b\u578b\u7684\u7d22\u5f15\uff0c\u4f46\u662f\u4ed6\u4eec\u7684\u5b9e\u73b0\u539f\u7406\u4e5f\u662f\u4e0d\u540c\u7684\u3002\r\n# Innodb\u548cMyISAM\u9ed8\u8ba4\u7684\u7d22\u5f15\u662fBtree\u7d22\u5f15\uff1b\u800cMemory\u9ed8\u8ba4\u7684\u7d22\u5f15\u662fHash\u7d22\u5f15\u3002\r\n# MyISAM\u5f15\u64ce\u4f7f\u7528 B+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\r\n\r\n# 4.2 MyISAM\u7d22\u5f15\u7684\u539f\u7406  \u89c1\u8bfe\u4ef6\r\n\r\n# 4.3 MyISAM \u4e0e InnoDB\u5bf9\u6bd4\r\n# MyISAM\u7684\u7d22\u5f15\u65b9\u5f0f\u90fd\u662f\u201c\u975e\u805a\u7c07\u201d\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\r\n\r\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\r\n# \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\r\n\r\n# \u2461 InnoDB\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\r\n# \u7d22\u5f15\u6587\u4ef6\u4ec5\u4fdd\u5b58\u6570\u636e\u8bb0\u5f55\u7684\u5730\u5740\u3002\r\n\r\n# \u2462 InnoDB\u7684\u975e\u805a\u7c07\u7d22\u5f15data\u57df\u5b58\u50a8\u76f8\u5e94\u8bb0\u5f55 \u4e3b\u952e\u7684\u503c \uff0c\u800cMyISAM\u7d22\u5f15\u8bb0\u5f55\u7684\u662f \u5730\u5740 \u3002\r\n# \u6362\u53e5\u8bdd\u8bf4\uff0cInnoDB\u7684\u6240\u6709\u975e\u805a\u7c07\u7d22\u5f15\u90fd\u5f15\u7528\u4e3b\u952e\u4f5c\u4e3adata\u57df\u3002\r\n\r\n# \u2463 MyISAM\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\r\n# \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\r\n\r\n# \u2464 InnoDB\u8981\u6c42\u8868 \u5fc5\u987b\u6709\u4e3b\u952e \uff08 MyISAM\u53ef\u4ee5\u6ca1\u6709 \uff09\u3002\u5982\u679c\u6ca1\u6709\u663e\u5f0f\u6307\u5b9a\uff0c\r\n# \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\r\n# \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\r\n\r\n# 5. \u7d22\u5f15\u7684\u4ee3\u4ef7\r\n\r\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\r\n\r\n# \u7a7a\u95f4\u4e0a\u7684\u4ee3\u4ef7\r\n# \u6bcf\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\r\n# \u4e00\u4e2a\u9875\u9ed8\u8ba4\u4f1a\u5360\u7528 16KB \u7684\u5b58\u50a8\u7a7a\u95f4\uff0c\u4e00\u68f5\u5f88\u5927\u7684B+\u6811\u7531\u8bb8\u591a\u6570\u636e\u9875\u7ec4\u6210\uff0c\u90a3\u5c31\u662f\u5f88\u5927\u7684\u4e00\u7247\u5b58\u50a8\u7a7a\u95f4\u3002\r\n\r\n# \u65f6\u95f4\u4e0a\u7684\u4ee3\u4ef7\r\n# \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\uff0c\r\n# B+\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\r\n# \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\r\n# \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\r\n# \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\r\n# \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\r\n\r\n# 6. MySQL\u6570\u636e\u7ed3\u6784\u9009\u62e9\u7684\u5408\u7406\u6027 \u89c1\u8bfe\u4ef6\r\n\r\n# 6.1 \u5168\u8868\u904d\u5386\r\n\r\n# 6.2 Hash\u7ed3\u6784\r\n\r\n# Hash\u7d22\u5f15\u9002\u7528\u5b58\u50a8\u5f15\u64ce\u5982\u8868\u6240\u793a\uff1a\r\n# \u7d22\u5f15 \/ \u5b58\u50a8\u5f15\u64ce       MyISAM      InnoDB      Memory\r\n# HASH\u7d22\u5f15              \u4e0d\u652f\u6301       \u4e0d\u652f\u6301      \u652f\u6301\r\n\r\n# Hash\u7d22\u5f15\u7684\u9002\u7528\u6027\r\n# \u91c7\u7528\u81ea\u9002\u5e94 Hash \u7d22\u5f15\u76ee\u7684\u662f\u65b9\u4fbf\u6839\u636e SQL \u7684\u67e5\u8be2\u6761\u4ef6\u52a0\u901f\u5b9a\u4f4d\u5230\u53f6\u5b50\u8282\u70b9\uff0c\r\n# \u7279\u522b\u662f\u5f53 B+ \u6811\u6bd4\u8f83\u6df1\u7684\u65f6\u5019\uff0c\u901a\u8fc7\u81ea\u9002\u5e94 Hash \u7d22\u5f15\u53ef\u4ee5\u660e\u663e\u63d0\u9ad8\u6570\u636e\u7684\u68c0\u7d22\u6548\u7387\u3002\r\n# \u6211\u4eec\u53ef\u4ee5\u901a\u8fc7 innodb_adaptive_hash_index \u53d8\u91cf\u6765\u67e5\u770b\u662f\u5426\u5f00\u542f\u4e86\u81ea\u9002\u5e94 Hash\uff0c\u6bd4\u5982\uff1a\r\nSHOW VARIABLES LIKE '%adaptive_hash_index';\r\n\r\n# 6.3 \u4e8c\u53c9\u641c\u7d22\u6811\r\n# \u5982\u679c\u6211\u4eec\u5229\u7528\u4e8c\u53c9\u6811\u4f5c\u4e3a\u7d22\u5f15\u7ed3\u6784\uff0c\u90a3\u4e48\u78c1\u76d8\u7684IO\u6b21\u6570\u548c\u7d22\u5f15\u6811\u7684\u9ad8\u5ea6\u662f\u76f8\u5173\u7684\u3002\r\n\r\n# 6.4 AVL\u6811\r\n\r\n# 6.5 B-Tree\r\n\r\n# 6.6 B+Tree\r\n\r\n# B+ \u6811\u548c B \u6811\u7684\u5dee\u5f02\uff1a\r\n# 1. \u6709 k \u4e2a\u5b69\u5b50\u7684\u8282\u70b9\u5c31\u6709 k \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\r\n\r\n# 2. \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\r\n\r\n# 3. \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\r\n# \u800c B \u6811\u4e2d\uff0c \u975e\u53f6\u5b50\u8282\u70b9\u65e2\u4fdd\u5b58\u7d22\u5f15\uff0c\u4e5f\u4fdd\u5b58\u6570\u636e\u8bb0\u5f55 \u3002\r\n\r\n# 4. \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\r\n# \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\r\n\r\n# B \u6811\u548c B+ \u6811\u90fd\u53ef\u4ee5\u4f5c\u4e3a\u7d22\u5f15\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5728 MySQL \u4e2d\u91c7\u7528\u7684\u662f B+ \u6811\u3002\r\n# \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\r\n\r\n# 6.7 R\u6811\r\n<\/code><\/pre>\n\n\n\n<p>MySQL\u6570\u636e\u7ed3\u6784\u9009\u62e9\u7684\u5408\u7406\u6027\u9700\u8981\u8bb0\u4f4f\u7684\u5185\u5bb9<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u9762\u8bd5\u5e38\u95ee.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"409\" height=\"239\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u9762\u8bd5\u5e38\u95ee.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1620\"  sizes=\"(max-width: 409px) 100vw, 409px\" \/><\/div><\/figure>\n\n\n\n<p>\u5206\u6790\u5185\u5bb9\uff1a\u7565<\/p>\n\n\n\n<p>\u4ec5\u4f9b\u81ea\u5df1\u67e5\u627e\u65b9\u4fbf\u4f7f\u7528<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MySQL\u6570\u636e\u7ed3\u6784\u9009\u62e9\u7684\u5408\u7406\u6027\u9700\u8981\u8bb0\u4f4f\u7684\u5185\u5bb9 \u5206\u6790\u5185\u5bb9\uff1a\u7565 \u4ec5\u4f9b\u81ea\u5df1\u67e5\u627e\u65b9\u4fbf\u4f7f\u7528<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[47],"class_list":["post-1619","post","type-post","status-publish","format-standard","hentry","category-mysql-code","tag-mysql"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1619"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1619"}],"version-history":[{"count":3,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1619\/revisions"}],"predecessor-version":[{"id":1672,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1619\/revisions\/1672"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1619"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1619"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1619"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}