{"id":4572,"date":"2024-10-29T09:47:18","date_gmt":"2024-10-29T01:47:18","guid":{"rendered":"https:\/\/www.talktop.cn\/?p=4572"},"modified":"2024-11-11T11:09:35","modified_gmt":"2024-11-11T03:09:35","slug":"mysql%e9%9d%a2%e8%af%95%e9%a2%98%e5%a4%a7%e6%8f%ad%e7%a7%98%ef%bc%9a%e9%9d%a2%e8%af%95%e5%ae%98%e6%9c%80%e7%88%b1%e7%9a%84%e9%82%a3%e4%ba%9b%e9%97%ae%e9%a2%98%ef%bc%81","status":"publish","type":"post","link":"https:\/\/www.talktop.cn\/?p=4572","title":{"rendered":"MySQL\u9762\u8bd5\u9898\u5927\u63ed\u79d8\uff1a\u9762\u8bd5\u5b98\u6700\u7231\u7684\u90a3\u4e9b\u95ee\u9898\uff01\uff08\u6301\u7eed\u66f4\u65b0\uff09"},"content":{"rendered":"\n<p>\uff08<strong>1\uff09sql\u6267\u884c\u987a\u5e8f\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n\n\n\n<p>from\uff08\u67e5\u8be2\u8303\u56f4\uff09\u300bjoin\uff08\u8fde\u8868\u67e5\u8be2\uff09\u300bwhere\uff08\u67e5\u8be2\u6761\u4ef6\uff09\u300bgroup by\uff08\u5206\u7ec4\uff09\u300bhaving\uff08\u5206\u7ec4\u6761\u4ef6\uff09\u300bselect\uff08\u67e5\u8be2\u5b57\u6bb5\uff09\u300bdistinct\uff08\u53bb\u91cd\uff09\u300border by \uff08\u6392\u5e8f\uff09\u300blimit\uff08\u67e5\u8be2\u6761\u6570\uff09<\/p>\n\n\n\n<p><strong>\uff082\uff09MyISAM\u548cInnoDB\u7684\u533a\u522b\uff1f<\/strong><\/p>\n\n\n\n<p>InnoDB\u652f\u6301\u4e8b\u52a1\u3001\u884c\u9501\u3001\u805a\u7c07\u7d22\u5f15\u3001\u91c7\u7528\u6570\u636e\u9875\u5b58\u50a8\u65b9\u5f0f\uff08\u6bcf\u4e2a\u8868\u5bf9\u5e94\u4e00\u4e2a\u8868\u7a7a\u95f4\uff0c\u5b58\u50a8\u5728data\u76ee\u5f55\u4e0b\u3002\u8868\u540d.ibd\uff09\uff0c\u5b9e\u9645\u5f00\u53d1\u4e2d\u9ed8\u8ba4\u4f7f\u7528InnoDB\u5b58\u50a8\u5f15\u64ce\u3002<\/p>\n\n\n\n<p>\u53cc\u5199\u7f13\u51b2\u533a\uff0c\u81ea\u9002\u5e94hash\u7d22\u5f15\u548cBufferPool\u4e00\u8d77\u88ab\u79f0\u4e3ainnodb\u7684\u4e09\u5927\u7279\u6027\u3002<\/p>\n\n\n\n<p>MyISAM\u4e0d\u652f\u6301\u4e8b\u52a1\u3001\u652f\u6301\u8868\u9501\u3001\u6bcf\u4e2a\u8868\u91c7\u7528.frm\u8868\u7ed3\u6784\u6587\u4ef6 .myd\u6570\u636e\u6587\u4ef6 .myi\u7d22\u5f15\u6587\u4ef6\u5b58\u50a8\u3002<\/p>\n\n\n\n<p><strong>\uff083\uff09MySQL\u4e2d\u7684\u60b2\u89c2\u9501\u548c\u4e50\u89c2\u9501\uff1f<\/strong><\/p>\n\n\n\n<p>MySQL\u4e2d\u7684\u4e50\u89c2\u9501\u53ef\u4ee5\u57fa\u4e8e\u7248\u672c\u53f7\u5b9e\u73b0\uff0c\u5728\u6570\u636e\u8868\u4e2d\u589e\u52a0\u4e00\u4e2a\u7248\u672c\u53f7\u5b57\u6bb5\uff0c\u66f4\u65b0\u524d\u67e5\u8be2\u7248\u672c\u53f7\uff0c\u5728\u66f4\u65b0\u65f6\u5019\u8fdb\u884c\u7248\u672c\u53f7\u5bf9\u6bd4\u3002<\/p>\n\n\n\n<p>MySQL\u60b2\u89c2\u9501\u53ef\u901a\u8fc7select for update\u5b9e\u73b0\u3002\u57fa\u4e8e\u6570\u636e\u5e93\u884c\u9501\u673a\u5236\u3002<\/p>\n\n\n\n<p><strong>\uff084\uff09\u4ec0\u4e48\u60c5\u51b5\u4e0b\u7d22\u5f15\u4f1a\u5931\u6548\uff1f<\/strong><\/p>\n\n\n\n<p>\u67e5\u8be2\u6761\u4ef6\u4f7f\u7528\u4e0d\u7b49\u4e8e\u3001\u5de6\u6a21\u7cca\u5339\u914d\u3001or\u3001\u51fd\u6570\u8ba1\u7b97<\/p>\n\n\n\n<p>\u67e5\u8be2\u6761\u4ef6\u8bbe\u8ba1\u5230\u7c7b\u578b\u8f6c\u6362<\/p>\n\n\n\n<p>\u7ec4\u5408\u7d22\u5f15\u524d\u4e00\u4e2a\u7d22\u5f15\u4f7f\u7528\u8303\u56f4\u67e5\u8be2<\/p>\n\n\n\n<p>\u6570\u636e\u8868\u6570\u636e\u91cf\u8f83\u5c11\u65f6<\/p>\n\n\n\n<p><strong>\uff085\uff09\u8bf4\u4e0bB+\u6811\u548cB-\u6811\uff1f<\/strong><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>\uff086\uff09explain\u6267\u884c\u5206\u6790\uff1f<\/strong><\/p>\n\n\n\n<p>explain\u662f\u4e00\u4e2a\u5206\u6790sql\u6267\u884c\u8ba1\u5212\u7684\u547d\u4ee4\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1007\" height=\"119\" src=\"https:\/\/www.talktop.cn\/wp-content\/uploads\/2024\/10\/image-106.png\" alt=\"\" class=\"wp-image-4573\" srcset=\"https:\/\/www.talktop.cn\/wp-content\/uploads\/2024\/10\/image-106.png 1007w, https:\/\/www.talktop.cn\/wp-content\/uploads\/2024\/10\/image-106-300x35.png 300w, https:\/\/www.talktop.cn\/wp-content\/uploads\/2024\/10\/image-106-768x91.png 768w\" sizes=\"(max-width: 1007px) 100vw, 1007px\" \/><\/figure>\n\n\n\n<p>explain\u7ed3\u679c\u53c2\u6570\uff1aselect_type\u53c2\u6570\u3001type\u53c2\u6570\uff08const\u3001eq_ref\u3001ref\u3001range\u3001index\u3001all\uff09\u3001key\u53c2\u6570\u3001req\u53c2\u6570\u3001select_type\u53c2\u6570\u3001extra\u53c2\u6570\u3002<\/p>\n\n\n\n<p>type\u53c2\u6570\u542b\u4e49\uff1aconst\u7ea7\u522b\u6807\u8bc6\u4f7f\u7528\u4e86\u4e3b\u952e\u6216\u552f\u4e00\u7d22\u5f15\uff0c\u6548\u7387\u9ad8\u3002<\/p>\n\n\n\n<p>eq_ref\u7ea7\u522b\u901a\u5e38\u7528\u4e8e\u8054\u63a5\uff0c\u6bcf\u4e2a\u7d22\u5f15\u8fd4\u56de\u5bf9\u5e94\u6570\u636e\u884c\uff0c\u4f7f\u7528\u4e3b\u952e\u6216\u552f\u4e00\u7d22\u5f15\uff0c\u6548\u7387\u9ad8\u3002<\/p>\n\n\n\n<p>ref\u7ea7\u522b\u4f7f\u7528\u975e\u552f\u4e00\u7d22\u5f15\uff0c\u8fd4\u56de\u5339\u914d\u6570\u636e\u884c\uff0c\u6d89\u53ca\u56de\u8868\u67e5\u8be2\u3002<\/p>\n\n\n\n<p>range\u7ea7\u522b\u7d22\u5f15\u8303\u56f4\u626b\u63cf\uff0c\u8fd4\u56de\u5339\u914d\u6570\u636e\u884c\uff0c\u6d89\u53ca\u56de\u8868\u67e5\u8be2\u3002<\/p>\n\n\n\n<p>index\u7ea7\u522b\u5168\u7d22\u5f15\u7ea7\u522b\u67e5\u8be2\uff0c\u4f7f\u7528\u573a\u666f\u6839\u636e\u975e\u552f\u4e00\u7d22\u5f15\u6392\u5e8f\u67e5\u8be2\u3002<\/p>\n\n\n\n<p>all\u7ea7\u522b\u5168\u8868\u67e5\u8be2\u3002<\/p>\n\n\n\n<p>extra\u53c2\u6570\u542b\u4e49\uff1aUsing index \u53ea\u9700\u8bfb\u53d6\u7d22\u5f15\u884c\u6570\u636e\uff0c\u65e0\u9700\u56de\u8868\u3002<\/p>\n\n\n\n<p>Using where \u7d22\u5f15\u68c0\u7d22\u540e\u8fd8\u9700\u6267\u884c\u6570\u636e\u7b5b\u9009\uff0c\u53ef\u521b\u5efa\u7ec4\u5408\u7d22\u5f15\u3002<\/p>\n\n\n\n<p>\u5b9e\u9645\u5f00\u53d1\u8fc7\u7a0b\u4e2dsql\u8bed\u53e5\u81f3\u5c11\u8981\u4f18\u5316\u5230range\u7ea7\u522b\u3002<\/p>\n\n\n\n<p><strong>\uff087\uff09\u5982\u4f55\u5904\u7406\u6162sql\uff1f<\/strong><\/p>\n\n\n\n<p>\u9996\u5148\u5f00\u542f\u6162sql\u76d1\u63a7\uff0c\u901a\u8fc7\u76d1\u63a7\u67e5\u8be2\u51fa\u6162sql\uff0c\u7136\u540e\u901a\u8fc7explain\u6267\u884c\u8ba1\u5212\u5206\u6790\u3002<\/p>\n\n\n\n<p>mysql\u5f00\u542f\u6162\u65e5\u5fd7\u8bb0\u5f55\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-5cd33c710fe404a87786143f0e528bd3\"><code>SET GLOBAL slow_query_log = 'ON';\nSET GLOBAL long_query_time = 2;\nSET GLOBAL slow_query_log_file = '\/path\/to\/your\/slow_query.log';<\/code><\/pre>\n\n\n\n<p><strong>\uff088\uff09sql\u4f18\u5316\uff1f<\/strong><\/p>\n\n\n\n<p>\u907f\u514d\u5728\u7d22\u5f15\u5217\u4e0a\u8fdb\u884c\u8ba1\u7b97\u3001\u4f7f\u7528\u51fd\u6570\u3001\u4e0d\u7b49\u4e8e\u3001not in<\/p>\n\n\n\n<p>select\u67e5\u8be2\u5fc5\u8981\u7684\u5217<\/p>\n\n\n\n<p>where\u67e5\u8be2\u9891\u7e41\u7684\u5b57\u6bb5\u5efa\u7acb\u7d22\u5f15<\/p>\n\n\n\n<p>\u7f29\u5c0f\u5b50\u67e5\u8be2\u7684\u7ed3\u679c<\/p>\n\n\n\n<p>from\u6d89\u53ca\u5230\u591a\u4e2a\u8868\u65f6\uff0c\u9009\u62e9\u6570\u636e\u6700\u5c11\u7684\u4e3a\u57fa\u7840\u8868<\/p>\n\n\n\n<p><strong>\uff089\uff09InnoDB\u901a\u8fc7\u4ec0\u4e48\u673a\u5236\u6765\u5b9e\u73b0\u4e8b\u52a1\u652f\u6301\u7684\uff1f<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\uff081\uff09sql\u6267\u884c\u987a\u5e8f\u662f\u4ec0\u4e48\uff1f from\uff08\u67e5\u8be2\u8303\u56f4\uff09\u300bjoin\uff08\u8fde\u8868\u67e5\u8be2\uff09\u300bwhere\uff08\u67e5\u8be2\u6761\u4ef6\uff09\u300bgroup  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[160],"tags":[132],"class_list":["post-4572","post","type-post","status-publish","format-standard","hentry","category-160","tag-mysql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>MySQL\u9762\u8bd5\u9898\u5927\u63ed\u79d8\uff1a\u9762\u8bd5\u5b98\u6700\u7231\u7684\u90a3\u4e9b\u95ee\u9898\uff01\uff08\u6301\u7eed\u66f4\u65b0\uff09<\/title>\n<meta name=\"description\" content=\"InnoDB\u652f\u6301\u4e8b\u52a1\u3001\u884c\u9501\u3001\u805a\u7c07\u7d22\u5f15\u3001\u91c7\u7528\u6570\u636e\u9875\u5b58\u50a8\u65b9\u5f0f\uff08\u6bcf\u4e2a\u8868\u5bf9\u5e94\u4e00\u4e2a\u8868\u7a7a\u95f4\uff0c\u5b58\u50a8\u5728data\u76ee\u5f55\u4e0b\u3002\u8868\u540d.ibd\uff09\uff0c\u5b9e\u9645\u5f00\u53d1\u4e2d\u9ed8\u8ba4\u4f7f\u7528InnoDB\u5b58\u50a8\u5f15\u64ce\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.talktop.cn\/?p=4572\" \/>\n<script type=\"application\/ld+json\" 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\u4eba\u5de5\u667a\u80fd \u7f16\u7a0b\u6280\u672f AIGC \u540e\u7aef\u6280\u672f \u524d\u7aef\u6280\u672f \u70ed\u95e8\u63d2\u4ef6 \u8fd0\u8425\u76f8\u5173 ChatGPT\u8ba2\u9605 Claude\u5145\u503c \u6d77\u5916\u5145\u503c 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