{"id":19000,"date":"2025-08-08T23:12:12","date_gmt":"2025-08-08T15:12:12","guid":{"rendered":"https:\/\/92it.top\/?p=19000"},"modified":"2025-08-08T23:12:12","modified_gmt":"2025-08-08T15:12:12","slug":"mysql%e6%98%af%e6%80%8e%e4%b9%88%e4%bf%9d%e8%af%81%e5%b9%b6%e5%8f%91%e8%af%bb%e5%86%99%e5%ae%89%e5%85%a8%e7%9a%84%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=19000","title":{"rendered":"Mysql\u662f\u600e\u4e48\u4fdd\u8bc1\u5e76\u53d1\u8bfb\u5199\u5b89\u5168\u7684\uff1f"},"content":{"rendered":"\n<p>\u4eca\u5929\u6211\u4eec\u6765\u804a\u4e00\u4e2aMySQL\u9762\u8bd5\u4e2d\u7684\u9ad8\u9891\u8003\u70b9\uff0c\u4e5f\u662f\u6bcf\u4e00\u4f4d\u540e\u7aef\u5f00\u53d1\u8005\u90fd\u5e94\u8be5\u6df1\u5ea6\u638c\u63e1\u7684\u6838\u5fc3\u77e5\u8bc6\u2014\u2014MVCC\u534f\u8bae\u3002<\/p>\n\n\n\n<p>MVCC\uff0c\u5168\u79f0\u662f\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236\uff08Multi-Version Concurrency Control\uff09\uff0c\u5b83\u662fMySQL InnoDB\u5b58\u50a8\u5f15\u64ce\u7528\u4ee5\u5b9e\u73b0\u9ad8\u6548\u5e76\u53d1\u8bbf\u95ee\u7684\u57fa\u77f3\u3002\u5728\u9762\u8bd5\u4e2d\uff0c\u8fd9\u51e0\u4e4e\u662f\u4e00\u4e2a\u65e0\u6cd5\u7ed5\u5f00\u7684\u8bdd\u9898\uff0c\u5b83\u5982\u540c\u4e00\u6247\u95e8\uff0c\u63a8\u5f00\u5b83\uff0c\u5c31\u80fd\u901a\u5411\u5bf9\u4e8b\u52a1\u3001\u9694\u79bb\u7ea7\u522b\u3001\u9501\u673a\u5236\u7b49\u4e00\u7cfb\u5217\u66f4\u6df1\u5c42\u6b21\u77e5\u8bc6\u7684\u63a2\u8ba8\u3002\u56e0\u6b64\uff0c\u5f7b\u5e95\u641e\u61c2MVCC\uff0c\u80fd\u8ba9\u4f60\u5728\u9762\u8bd5\u4e2d\u6e38\u5203\u6709\u4f59\uff0c\u4ece\u5bb9\u5730\u5c55\u73b0\u81ea\u5df1\u7684\u6280\u672f\u6df1\u5ea6\u3002<\/p>\n\n\n\n<p>\u5728\u63a5\u4e0b\u6765\u7684\u5185\u5bb9\u91cc\uff0c\u6211\u5c06\u5e26\u4f60\u4eceMVCC\u7684\u5e95\u5c42\u539f\u7406\u51fa\u53d1\uff0c\u4e0d\u4ec5\u8ba9\u4f60\u7406\u89e3\u5b83\u201c\u662f\u4ec0\u4e48\u201d\uff0c\u66f4\u8ba9\u4f60\u660e\u767d\u5b83\u201c\u4e3a\u4ec0\u4e48\u201d\u5982\u6b64\u8bbe\u8ba1\uff0c\u4ee5\u53ca\u5982\u4f55\u5728\u9762\u8bd5\u4e2d\u5c06\u8fd9\u4e9b\u77e5\u8bc6\u8f6c\u5316\u4e3a\u4f60\u7684\u4f18\u52bf\u3002<\/p>\n\n\n\n<p>\u5728\u6b63\u5f0f\u5f00\u59cb\u4e4b\u524d\uff0c\u6211\u4eec\u5148\u6765\u601d\u8003\u4e00\u4e2a\u6700\u6839\u672c\u7684\u95ee\u9898\uff1a\u5728\u5df2\u7ecf\u6709\u9501\u673a\u5236\u7684\u60c5\u51b5\u4e0b\uff0cInnoDB\u4e3a\u4ec0\u4e48\u8fd8\u9700\u8981\u8d39\u5c3d\u5fc3\u673a\u5730\u5f15\u5165MVCC\u5462\uff1f<\/p>\n\n\n\n<p>\u3000<\/p>\n\n\n\n<p><strong>1. MVCC\u6709\u4ec0\u4e48\u7528<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u4f60\u53ef\u80fd\u5df2\u7ecf\u5bf9\u6570\u636e\u5e93\u7684\u9501\u673a\u5236\u6709\u6240\u4e86\u89e3\uff0c\u77e5\u9053\u5b83\u662f\u4fdd\u969c\u6570\u636e\u4e00\u81f4\u6027\u3001\u8fdb\u884c\u5e76\u53d1\u63a7\u5236\u7684\u57fa\u7840\u5de5\u5177\u3002\u90a3\u4e48\uff0c\u65e2\u7136\u5df2\u7ecf\u6709\u4e86\u9501\uff0c\u4e3a\u4ec0\u4e48InnoDB\u8fd8\u8981\u591a\u6b64\u4e00\u4e3e\u5f15\u5165MVCC\u5462\uff1f\u76f4\u63a5\u7528\u8bfb\u5199\u9501\u628a\u6240\u6709\u5e76\u53d1\u8bbf\u95ee\u90fd\u7ba1\u8d77\u6765\uff0c\u4e0d\u662f\u66f4\u7b80\u5355\u76f4\u63a5\u5417\uff1f<\/p>\n\n\n\n<p>\u7b54\u6848\u662f\uff1a<strong>\u5355\u7eaf\u4f9d\u8d56\u9501\uff0c\u6027\u80fd\u5b9e\u5728\u592a\u7cdf\u7cd5\u4e86\u3002<\/strong><\/p>\n\n\n\n<p>\u5728\u4e00\u4e2a\u7eaf\u7cb9\u7684\u9501\u6a21\u578b\u4e2d\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u7edd\u5bf9\u7684\u6570\u636e\u4e00\u81f4\u6027\uff0c\u64cd\u4f5c\u4e4b\u95f4\u7684\u4e92\u65a5\u662f\u4e0d\u53ef\u907f\u514d\u7684\u3002\u5199\u64cd\u4f5c\u4f1a\u963b\u585e\u5176\u4ed6\u5199\u64cd\u4f5c\uff0c\u8fd9\u7406\u6240\u5f53\u7136\u3002\u4f46\u66f4\u81f4\u547d\u7684\u662f\uff0c\u5199\u64cd\u4f5c\u540c\u6837\u4f1a\u963b\u585e\u8bfb\u64cd\u4f5c\u3002\u5373\u4f7f\u7528\u4e86\u6240\u8c13\u7684\u201c\u8bfb\u5199\u9501\u201d\uff08\u5141\u8bb8\u591a\u4e2a\u8bfb\u64cd\u4f5c\u5e76\u53d1\uff0c\u4f46\u8bfb\u5199\u3001\u5199\u5199\u4e92\u65a5\uff09\uff0c\u8bfb\u4e0e\u5199\u4e4b\u95f4\u7684\u51b2\u7a81\u4f9d\u7136\u5b58\u5728\u3002<\/p>\n\n\n\n<p>\u6570\u636e\u5e93\u7cfb\u7edf\u4e0e\u5e38\u89c4\u7684\u5e94\u7528\u7a0b\u5e8f\u6709\u4e00\u4e2a\u663e\u8457\u7684\u533a\u522b\uff1a\u5b83\u627f\u8f7d\u7740\u9ad8\u9891\u7684\u8bfb\u5199\u8bf7\u6c42\uff0c\u5c24\u5176\u662f\u8bfb\u53d6\u64cd\u4f5c\uff0c\u5176\u6027\u80fd\u8868\u73b0\u81f3\u5173\u91cd\u8981\u3002\u60f3\u8c61\u4e00\u4e0b\u8fd9\u4e2a\u4e1a\u52a1\u573a\u666f\uff1a\u4e00\u4e2a\u6838\u5fc3\u4e1a\u52a1\u7ebf\u7a0b\u6b63\u5728\u6267\u884c<code>UPDATE<\/code>\u64cd\u4f5c\u4fee\u6539\u67d0\u4e00\u884c\u5173\u952e\u6570\u636e\uff0c\u54ea\u6015\u8fd9\u4e2a\u64cd\u4f5c\u53ea\u9700\u8981\u51e0\u5341\u6beb\u79d2\uff0c\u4f46\u5728\u8fd9\u671f\u95f4\uff0c\u6240\u6709\u5e0c\u671b\u8bfb\u53d6\u8fd9\u884c\u6570\u636e\u7684<code>SELECT<\/code>\u8bf7\u6c42\u90fd\u88ab\u8feb\u6302\u8d77\u7b49\u5f85\u3002\u5728\u9ad8\u5e76\u53d1\u7cfb\u7edf\u4e2d\uff0c\u8fd9\u79cd\u963b\u585e\u4f1a\u8fc5\u901f\u7d2f\u79ef\uff0c\u5bfc\u81f4\u7cfb\u7edf\u541e\u5410\u91cf\u6025\u5267\u4e0b\u964d\uff0c\u7528\u6237\u54cd\u5e94\u65f6\u95f4\u5927\u5e45\u5ef6\u957f\u3002\u8fd9\u6837\u7684\u6027\u80fd\u8868\u73b0\uff0c\u5728\u771f\u5b9e\u7684\u7ebf\u4e0a\u73af\u5883\u4e2d\u662f\u7edd\u5bf9\u65e0\u6cd5\u63a5\u53d7\u7684\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"549\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-271-1024x549.png\" alt=\"\" class=\"wp-image-19001\" style=\"width:512px;height:auto\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-271-1024x549.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-271-300x161.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-271-768x412.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-271-830x445.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-271-230x123.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-271-350x188.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-271-480x257.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-271.png 1384w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>\u663e\u7136\uff0c\u4e3a\u4e86\u6323\u8131\u8fd9\u79cd\u6027\u80fd\u67b7\u9501\uff0c\u6570\u636e\u5e93\u5fc5\u987b\u5bfb\u6c42\u4e00\u79cd\u66f4\u4f18\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u5b9e\u73b0\u4e00\u79cd\u201c\u8bfb\u5199\u5e76\u53d1\u201d\u7684\u7406\u60f3\u72b6\u6001\uff1a<strong>\u5f53\u6211\u5728\u4fee\u6539\u6570\u636e\u65f6\uff0c\u4f60\u4f9d\u7136\u53ef\u4ee5\u65e0\u963b\u585e\u5730\u8bfb\u53d6\u6570\u636e\u3002<\/strong> \u8fd9\u5c31\u662fMVCC\u8bde\u751f\u7684\u6838\u5fc3\u9a71\u52a8\u529b\u3002\u5b83\u901a\u8fc7\u4e00\u79cd\u5de7\u5999\u7684\u65b9\u5f0f\uff0c\u8ba9\u8bfb\u548c\u5199\u5728\u5927\u591a\u6570\u65f6\u5019\u53ef\u4ee5\u5404\u884c\u5176\u9053\uff0c\u4e92\u4e0d\u5e72\u6270\u3002<\/p>\n\n\n\n<p>\u7406\u89e3\u4e86MVCC\u5b58\u5728\u7684\u4ef7\u503c\u540e\uff0c\u6211\u4eec\u624d\u80fd\u66f4\u597d\u5730\u53bb\u63a2\u7a76\u5b83\u7684\u5b9e\u73b0\u7ec6\u8282\u3002\u800c\u8981\u7406\u89e3MVCC\uff0c\u5c31\u5fc5\u987b\u5148\u638c\u63e1\u4e00\u4e2a\u4e0e\u4e4b\u7d27\u5bc6\u76f8\u8fde\u7684\u524d\u7f6e\u6982\u5ff5\u2014\u2014\u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b\u3002<\/p>\n\n\n\n<p>\u3000<\/p>\n\n\n\n<p><strong>2. \u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u6570\u636e\u5e93\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u672c\u8d28\u4e0a\u662f\u5b9a\u4e49\u7684\u4e00\u5957\u201c\u6e38\u620f\u89c4\u5219\u201d\uff0c\u5b83\u7528\u4e8e\u89c4\u8303\u5728\u5e76\u53d1\u73af\u5883\u4e0b\uff0c\u4e00\u4e2a\u4e8b\u52a1\u7684\u4fee\u6539\u5bf9\u5176\u4ed6\u4e8b\u52a1\u7684\u53ef\u89c1\u6027\u7a0b\u5ea6\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u5b83\u754c\u5b9a\u4e86\u4e8b\u52a1\u4e4b\u95f4\u201c\u4e92\u76f8\u4e86\u89e3\u201d\u7684\u8fb9\u754c\u3002ANSI\/ISO SQL\u6807\u51c6\u5b9a\u4e49\u4e86\u56db\u79cd\u9694\u79bb\u7ea7\u522b\uff1a<\/p>\n\n\n\n<p><strong>\u8bfb\u672a\u63d0\u4ea4\uff08Read Uncommitted\uff09<\/strong><\/p>\n\n\n\n<p>\u8fd9\u662f\u6700\u4f4e\u7684\u9694\u79bb\u7ea7\u522b\u3002\u5728\u6b64\u7ea7\u522b\u4e0b\uff0c\u4e00\u4e2a\u4e8b\u52a1\u53ef\u4ee5\u770b\u5230\u53e6\u4e00\u4e2a\u4e8b\u52a1\u5c1a\u672a\u63d0\u4ea4\u7684\u4fee\u6539\uff0c\u56e0\u6b64\u98ce\u9669\u6781\u9ad8\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u201c\u810f\u8bfb\u201d\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"487\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-272-1024x487.png\" alt=\"\" class=\"wp-image-19003\" style=\"width:532px;height:auto\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-272-1024x487.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-272-300x143.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-272-768x365.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-272-830x395.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-272-230x109.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-272-350x167.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-272-480x228.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-272.png 1400w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p><a href=\"https:\/\/golangstar.cn\/backend_series\/advanced_interview\/database_mvcc.html#_2-\u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b\"><\/a><a href=\"https:\/\/golangstar.cn\/backend_series\/advanced_interview\/database_mvcc.html#_1-mvcc\u6709\u4ec0\u4e48\u7528\"><\/a><\/p>\n\n\n\n<p><strong>\u8bfb\u5df2\u63d0\u4ea4\uff08Read Committed, RC\uff09<\/strong><\/p>\n\n\n\n<p>\u8fd9\u662f\u5927\u591a\u6570\u4e3b\u6d41\u6570\u636e\u5e93\uff08\u5982Oracle\u3001PostgreSQL\uff09\u9ed8\u8ba4\u7684\u9694\u79bb\u7ea7\u522b\u3002\u4e00\u4e2a\u4e8b\u52a1\u53ea\u80fd\u770b\u5230\u5176\u4ed6\u4e8b\u52a1\u5df2\u7ecf\u63d0\u4ea4\u7684\u4fee\u6539\u3002\u8fd9\u786e\u4fdd\u4e86\u4f60\u8bfb\u5230\u7684\u6570\u636e\u81f3\u5c11\u662f\u201c\u771f\u5b9e\u5b58\u5728\u201d\u8fc7\u7684\u3002\u4f46\u95ee\u9898\u5728\u4e8e\uff0c\u5728\u4e00\u4e2a\u4e8b\u52a1\u7684\u6267\u884c\u8fc7\u7a0b\u4e2d\uff0c\u5982\u679c\u5176\u4ed6\u4e8b\u52a1\u63d0\u4ea4\u4e86\u65b0\u7684\u4fee\u6539\uff0c\u672c\u4e8b\u52a1\u540e\u7eed\u7684\u67e5\u8be2\u662f\u80fd\u591f\u770b\u5230\u8fd9\u4e9b\u65b0\u53d8\u66f4\u7684\uff0c\u4ece\u800c\u5bfc\u81f4\u201c\u4e0d\u53ef\u91cd\u590d\u8bfb\u201d\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"459\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-274-1024x459.png\" alt=\"\" class=\"wp-image-19005\" style=\"width:552px;height:auto\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-274-1024x459.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-274-300x135.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-274-768x344.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-274-830x372.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-274-230x103.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-274-350x157.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-274-480x215.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-274.png 1436w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p><strong>\u53ef\u91cd\u590d\u8bfb\uff08Repeatable Read, RR\uff09<\/strong><a href=\"https:\/\/golangstar.cn\/backend_series\/advanced_interview\/database_mvcc.html#_2-\u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b\"><\/a><a href=\"https:\/\/golangstar.cn\/backend_series\/advanced_interview\/database_mvcc.html#_1-mvcc\u6709\u4ec0\u4e48\u7528\"><\/a><\/p>\n\n\n\n<p>\u8fd9\u662fMySQL InnoDB\u5b58\u50a8\u5f15\u64ce\u7684\u9ed8\u8ba4\u9694\u79bb\u7ea7\u522b\u3002\u5b83\u4fdd\u8bc1\u4e86\u5728\u4e00\u4e2a\u4e8b\u52a1\u5185\u90e8\uff0c\u65e0\u8bba\u4f60\u5bf9\u540c\u4e00\u4efd\u6570\u636e\u8bfb\u53d6\u591a\u5c11\u6b21\uff0c\u5f97\u5230\u7684\u7ed3\u679c\u59cb\u7ec8\u662f\u4e00\u81f4\u7684\u3002\u8fd9\u610f\u5473\u7740\uff0c\u4e00\u65e6\u4e8b\u52a1\u5f00\u59cb\uff0c\u5b83\u5c31\u4eff\u4f5b\u8fdb\u5165\u4e86\u4e00\u4e2a\u201c\u65f6\u95f4\u51dd\u56fa\u201d\u7684\u5feb\u7167\u4e2d\uff0c\u5373\u4f7f\u5728\u6b64\u671f\u95f4\u6709\u5176\u4ed6\u4e8b\u52a1\u63d0\u4ea4\u4e86\u4fee\u6539\uff0c\u5f53\u524d\u4e8b\u52a1\u4e5f\u201c\u89c6\u800c\u4e0d\u89c1\u201d\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"503\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-273-1024x503.png\" alt=\"\" class=\"wp-image-19004\" style=\"width:530px;height:auto\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-273-1024x503.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-273-300x147.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-273-768x377.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-273-830x407.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-273-230x113.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-273-350x172.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-273-480x236.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-273.png 1406w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p><strong>\u4e32\u884c\u5316\uff08Serializable\uff09<\/strong><\/p>\n\n\n\n<p>\u8fd9\u662f\u6700\u9ad8\u7684\u9694\u79bb\u7ea7\u522b\u3002\u5b83\u901a\u8fc7\u5bf9\u6240\u6709\u8bfb\u5199\u64cd\u4f5c\u90fd\u52a0\u9501\u7684\u65b9\u5f0f\uff0c\u5f3a\u5236\u6240\u6709\u4e8b\u52a1\u4e32\u884c\u6267\u884c\uff0c\u4e00\u4e2a\u63a5\u4e00\u4e2a\u5730\u6392\u961f\u5904\u7406\u3002\u8fd9\u80fd\u591f\u5b8c\u5168\u907f\u514d\u6240\u6709\u7684\u5e76\u53d1\u95ee\u9898\uff0c\u4f46\u4ee3\u4ef7\u662f\u5e76\u53d1\u6027\u80fd\u6025\u5267\u4e0b\u964d\uff0c\u51e0\u4e4e\u56de\u5230\u4e86\u5355\u7ebf\u7a0b\u65f6\u4ee3\u3002<\/p>\n\n\n\n<p>\u4ece\u4e0a\u5230\u4e0b\uff0c\u9694\u79bb\u6027\u8d8a\u6765\u8d8a\u5f3a\uff0c\u6570\u636e\u4e00\u81f4\u6027\u4fdd\u969c\u8d8a\u597d\uff0c\u4f46\u5e76\u53d1\u6027\u80fd\u4e5f\u968f\u4e4b\u4e0b\u964d\u3002\u56e0\u6b64\uff0c\u9009\u62e9\u5408\u9002\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u662f\u5728\u4e1a\u52a1\u9700\u6c42\u548c\u7cfb\u7edf\u6027\u80fd\u4e4b\u95f4\u8fdb\u884c\u6743\u8861\u7684\u827a\u672f\u3002<\/p>\n\n\n\n<p>\u4e0e\u9694\u79bb\u7ea7\u522b\u76f8\u4f34\u800c\u751f\u7684\uff0c\u662f\u4e09\u4e2a\u7ecf\u5178\u7684\u5e76\u53d1\u8bfb\u95ee\u9898\uff1a<\/p>\n\n\n\n<ul>\n<li><strong>\u810f\u8bfb\uff08Dirty Read\uff09<\/strong>\uff1a\u6307\u8bfb\u5230\u4e86\u5176\u4ed6\u4e8b\u52a1\u8fd8\u672a\u63d0\u4ea4\u7684\u6570\u636e\u3002\u8fd9\u4e9b\u6570\u636e\u56e0\u4e3a\u968f\u65f6\u53ef\u80fd\u88ab\u56de\u6eda\u800c\u6d88\u5931\uff0c\u6240\u4ee5\u88ab\u79f0\u4e3a\u201c\u810f\u201d\u6570\u636e\uff0c\u662f\u6781\u4e0d\u7a33\u5b9a\u7684\u3002<\/li>\n\n\n\n<li><strong>\u4e0d\u53ef\u91cd\u590d\u8bfb\uff08Non-Repeatable Read\uff09<\/strong>\uff1a\u6307\u5728\u540c\u4e00\u4e2a\u4e8b\u52a1\u4e2d\uff0c\u5bf9\u540c\u4e00\u884c\u6570\u636e\u524d\u540e\u4e24\u6b21\u8bfb\u53d6\uff0c\u5f97\u5230\u7684\u7ed3\u679c\u4e0d\u4e00\u81f4\u3002\u5176\u5173\u6ce8\u70b9\u5728\u4e8e<strong>\u6570\u636e\u5185\u5bb9\u7684\u53d8\u66f4<\/strong>\u3002<\/li>\n\n\n\n<li><strong>\u5e7b\u8bfb\uff08Phantom Read\uff09<\/strong>\uff1a\u6307\u5728\u4e00\u4e2a\u4e8b\u52a1\u7684\u6267\u884c\u8fc7\u7a0b\u4e2d\uff0c\u53e6\u4e00\u4e2a\u4e8b\u52a1\u63d2\u5165\u4e86\u65b0\u7684\u6570\u636e\u884c\u5e76\u63d0\u4ea4\uff0c\u5bfc\u81f4\u7b2c\u4e00\u4e2a\u4e8b\u52a1\u5728\u540e\u7eed\u7684\u67e5\u8be2\u4e2d\uff0c\u8bfb\u5230\u4e86\u4e4b\u524d\u4e0d\u5b58\u5728\u7684\u201c\u5e7b\u5f71\u201d\u884c\u3002\u5176\u5173\u6ce8\u70b9\u5728\u4e8e<strong>\u6570\u636e\u884c\u6570\u7684\u589e\u51cf<\/strong>\u3002<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"512\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-275-1024x512.png\" alt=\"\" class=\"wp-image-19006\" style=\"width:546px;height:auto\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-275-1024x512.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-275-300x150.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-275-768x384.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-275-830x415.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-275-230x115.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-275-350x175.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-275-480x240.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-275.png 1376w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>\u6211\u4eec\u53ef\u4ee5\u7528\u4e00\u4e2a\u8868\u683c\u6765\u6e05\u6670\u5730\u5c55\u793a\u9694\u79bb\u7ea7\u522b\u4e0e\u8fd9\u4e09\u79cd\u8bfb\u95ee\u9898\u7684\u5173\u7cfb\uff1a<\/p>\n\n\n\n<p>\u8fd9\u91cc\u9700\u8981\u7279\u522b\u5f3a\u8c03\u4e00\u70b9\uff1a\u6839\u636eSQL\u6807\u51c6\uff0c\u53ef\u91cd\u590d\u8bfb\u9694\u79bb\u7ea7\u522b\u662f\u65e0\u6cd5\u5b8c\u5168\u907f\u514d\u5e7b\u8bfb\u7684\u3002\u4f46\u662f\uff0cMySQL\u7684InnoDB\u5f15\u64ce\u901a\u8fc7\u5f15\u5165**\u4e34\u952e\u9501\uff08Next-Key Lock\uff09**\u8fd9\u4e00\u5f3a\u5927\u7684\u9501\u5b9a\u673a\u5236\uff0c\u5728RR\u7ea7\u522b\u4e0b\u5de7\u5999\u5730\u89e3\u51b3\u4e86\u5e7b\u8bfb\u95ee\u9898\u3002\u5728\u9762\u8bd5\u4e2d\u63d0\u53ca\u8fd9\u4e00\u70b9\uff0c\u5e76\u80fd\u89e3\u91ca\u5176\u539f\u7406\uff0c\u65e0\u7591\u4f1a\u662f\u4e00\u4e2a\u91cd\u8981\u7684\u52a0\u5206\u9879\u3002<\/p>\n\n\n\n<p>\u6b64\u5916\uff0c\u8fd8\u6709\u4e24\u4e2a\u6982\u5ff5\u9700\u8981\u7cbe\u786e\u533a\u5206\uff1a<strong>\u5feb\u7167\u8bfb\uff08Snapshot Read\uff09\u548c\u5f53\u524d\u8bfb\uff08Current Read\uff09<\/strong>\u3002\u7b80\u5355\u7406\u89e3\uff0c\u5feb\u7167\u8bfb\uff08\u5982\u666e\u901a\u7684<code>SELECT<\/code>\uff09\u8bfb\u53d6\u7684\u662fMVCC\u673a\u5236\u63d0\u4f9b\u7684\u5386\u53f2\u7248\u672c\u6570\u636e\uff0c\u5b83\u65e0\u987b\u52a0\u9501\uff0c\u901f\u5ea6\u5f88\u5feb\u3002\u800c\u5f53\u524d\u8bfb\uff08\u5982<code>SELECT ... FOR UPDATE<\/code>\u3001<code>UPDATE<\/code>\u3001<code>DELETE<\/code>\uff09\u8bfb\u53d6\u7684\u662f\u6570\u636e\u5e93\u4e2d\u6700\u65b0\u7684\u3001\u5df2\u63d0\u4ea4\u7684\u7248\u672c\uff0c\u5e76\u4e14\u4f1a\u5bf9\u8bfb\u53d6\u7684\u8bb0\u5f55\u52a0\u9501\uff0c\u4ee5\u4fdd\u8bc1\u6570\u636e\u7684\u4e00\u81f4\u6027\u3002\u5728MySQL\u7684\u53ef\u91cd\u590d\u8bfb\u9694\u79bb\u7ea7\u522b\u4e0b\uff0c\u666e\u901a\u7684<code>SELECT<\/code>\u8bed\u53e5\u6267\u884c\u7684\u5c31\u662f\u5feb\u7167\u8bfb\u3002<\/p>\n\n\n\n<p>\u3000<\/p>\n\n\n\n<p><strong>3. \u7248\u672c\u94fe<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u4e3a\u4e86\u5b9e\u73b0MVCC\uff0cInnoDB\u4e3a\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u6570\u636e\u90fd\u989d\u5916\u589e\u52a0\u4e86\u4e24\u4e2a\u9690\u85cf\u7684\u7cfb\u7edf\u5b57\u6bb5\uff1a<code>trx_id<\/code>\u548c<code>roll_ptr<\/code>\u3002<\/p>\n\n\n\n<ul>\n<li><code>trx_id<\/code>\uff08Transaction ID\uff09\uff1a\u4e8b\u52a1ID\u3002MVCC\u4e2d\u7684\u201cV\u201d\uff08Version\uff09\u6307\u7684\u5c31\u662f\u7531\u4e0d\u540c\u4e8b\u52a1ID\u521b\u9020\u7684\u6570\u636e\u7248\u672c\u3002\u6bcf\u5f53\u4e00\u4e2a\u4e8b\u52a1\u5f00\u59cb\u65f6\uff0c\u5b83\u4f1a\u83b7\u5f97\u4e00\u4e2a\u552f\u4e00\u7684\u3001\u5355\u8c03\u9012\u589e\u7684\u4e8b\u52a1ID\u3002\u5f53\u8fd9\u4e2a\u4e8b\u52a1\u4fee\u6539\u67d0\u884c\u6570\u636e\u65f6\uff0c\u8be5\u884c\u7684<code>trx_id<\/code>\u5c31\u4f1a\u88ab\u66f4\u65b0\u4e3a\u5f53\u524d\u4e8b\u52a1\u7684ID\u3002<\/li>\n\n\n\n<li><code>roll_ptr<\/code>\uff08Rollback Pointer\uff09\uff1a\u56de\u6eda\u6307\u9488\u3002\u5b83\u662f\u4e00\u4e2a\u6307\u5411<code>undo log<\/code>\u4e2d\u4e0a\u4e00\u7248\u672c\u8bb0\u5f55\u7684\u6307\u9488\u3002InnoDB\u6b63\u662f\u901a\u8fc7\u8fd9\u4e2a\u6307\u9488\uff0c\u5c06\u4e00\u884c\u6570\u636e\u7684\u591a\u4e2a\u5386\u53f2\u7248\u672c\u50cf\u94fe\u8868\u4e00\u6837\u4e32\u8054\u8d77\u6765\uff0c\u5f62\u6210\u4e00\u4e2a\u201c\u7248\u672c\u94fe\u201d\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u5b9e\u9645\u4e0a\uff0cInnoDB\u8fd8\u6709\u4e00\u4e2a\u9690\u85cf\u7684<code>row_id<\/code>\u5217\uff0c\u5728\u6ca1\u6709\u663e\u5f0f\u5b9a\u4e49\u4e3b\u952e\u65f6\uff0c\u5b83\u4f1a\u4f5c\u4e3a\u5185\u90e8\u4e3b\u952e\u3002\u4f46\u5b83\u4e0eMVCC\u7684\u5e76\u53d1\u63a7\u5236\u903b\u8f91\u5173\u7cfb\u4e0d\u5927\uff0c\u6211\u4eec\u5728\u6b64\u4e0d\u505a\u8fc7\u591a\u5173\u6ce8\u3002<\/p>\n\n\n\n<p>\u4e0b\u9762\uff0c\u6211\u4eec\u901a\u8fc7\u4e00\u4e2a\u5177\u4f53\u7684\u4f8b\u5b50\u6765\u76f4\u89c2\u5730\u7406\u89e3\u7248\u672c\u94fe\u662f\u5982\u4f55\u6784\u5efa\u7684\u3002<\/p>\n\n\n\n<p>\u5047\u8bbe\u6211\u4eec\u5411\u8868\u4e2d\u63d2\u5165\u4e00\u6761\u65b0\u6570\u636e<code>{id: 1, x: 130}<\/code>\uff0c\u6267\u884c\u8be5\u64cd\u4f5c\u7684\u4e8b\u52a1ID\u4e3a100\u3002\u6b64\u65f6\uff0c\u8fd9\u884c\u6570\u636e\u7684\u6700\u65b0\u7248\u672c\u72b6\u6001\u5982\u4e0b\uff1a<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"312\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-276-1024x312.png\" alt=\"\" class=\"wp-image-19007\" style=\"width:522px;height:auto\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-276-1024x312.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-276-300x91.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-276-768x234.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-276-830x253.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-276-230x70.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-276-350x107.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-276-480x146.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-276.png 1386w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>\u73b0\u5728\uff0c\u4e00\u4e2a\u65b0\u7684\u4e8b\u52a1A\uff08ID\u4e3a101\uff09\u542f\u52a8\uff0c\u5e76\u5c06<code>x<\/code>\u7684\u503c\u4fee\u6539\u4e3a150\u3002\u8fd9\u65f6\uff0c\u6570\u636e\u5e93\u5e76\u4e0d\u4f1a\u76f4\u63a5\u8986\u76d6\u539f\u59cb\u6570\u636e\uff0c\u800c\u662f\u4f1a\u6267\u884c\u4ee5\u4e0b\u64cd\u4f5c\uff1a<\/p>\n\n\n\n<ol>\n<li>\u5c06\u539f\u59cb\u884c\u6570\u636e<code>{id: 1, x: 130, trx_id: 100}<\/code>\u5b8c\u6574\u5730\u62f7\u8d1d\u5230<code>undo log<\/code>\u4e2d\u3002<\/li>\n\n\n\n<li>\u5728\u539f\u59cb\u6570\u636e\u884c\u4e0a\u8fdb\u884c\u4fee\u6539\uff0c\u5c06<code>x<\/code>\u66f4\u65b0\u4e3a150\uff0c\u5e76\u5c06<code>trx_id<\/code>\u66f4\u65b0\u4e3a\u5f53\u524d\u4e8b\u52a1\u7684ID\uff0c\u5373101\u3002<\/li>\n\n\n\n<li>\u5c06\u8fd9\u884c\u65b0\u6570\u636e\u7684<code>roll_ptr<\/code>\u6307\u5411\u521a\u521a\u5728<code>undo log<\/code>\u4e2d\u521b\u5efa\u7684\u65e7\u7248\u672c\u8bb0\u5f55\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u4fee\u6539\u540e\uff0c\u6570\u636e\u884c\u7684\u6700\u65b0\u72b6\u6001\u53d8\u4e3a\uff1a<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"466\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-277-1024x466.png\" alt=\"\" class=\"wp-image-19008\" style=\"width:546px;height:auto\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-277-1024x466.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-277-300x137.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-277-768x350.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-277-830x378.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-277-230x105.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-277-350x159.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-277-480x219.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-277.png 1392w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>\u63a5\u7740\uff0c\u53c8\u6765\u4e86\u4e00\u4e2a\u4e8b\u52a1B\uff08ID\u4e3a102\uff09\uff0c\u5b83\u5c06<code>x<\/code>\u7684\u503c\u4ece150\u4fee\u6539\u4e3a200\u3002\u540c\u6837\u5730\uff0c\u6570\u636e\u5e93\u4f1a\u91cd\u590d\u4e0a\u8ff0\u8fc7\u7a0b\uff0c\u5c06<code>trx_id<\/code>\u4e3a101\u7684\u7248\u672c\u62f7\u8d1d\u5230<code>undo log<\/code>\uff0c\u7136\u540e\u66f4\u65b0\u6570\u636e\u884c\u7684\u6700\u65b0\u7248\u672c\uff0c\u5e76\u5c06<code>roll_ptr<\/code>\u6307\u5411<code>trx_id<\/code>\u4e3a101\u7684\u7248\u672c\u3002<a href=\"https:\/\/golangstar.cn\/backend_series\/advanced_interview\/database_mvcc.html#_3-\u7248\u672c\u94fe\"><\/a><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"561\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-278-1024x561.png\" alt=\"\" class=\"wp-image-19009\" style=\"width:548px;height:auto\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-278-1024x561.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-278-300x164.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-278-768x421.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-278-830x454.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-278-230x126.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-278-350x192.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-278-480x263.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-278.png 1388w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>\u8fd9\u6837\u4e00\u6765\uff0c\u901a\u8fc7<code>roll_ptr<\/code>\uff0c\u4e00\u884c\u6570\u636e\u7684\u591a\u4e2a\u5386\u53f2\u7248\u672c\u5c31\u88ab\u4ece\u65b0\u5230\u65e7\u5730\u4e32\u8054\u6210\u4e86\u4e00\u6761\u94fe\u8868\u3002\u8fd9\u6761\u94fe\u5c31\u662f\u5927\u540d\u9f0e\u9f0e\u7684<strong>\u7248\u672c\u94fe<\/strong>\u3002<\/p>\n\n\n\n<p>\u73b0\u5728\u95ee\u9898\u6765\u4e86\uff1a\u5982\u679c\u4e00\u4e2a\u65b0\u7684\u4e8b\u52a1C\u60f3\u8981\u8bfb\u53d6<code>x<\/code>\u7684\u503c\uff0c\u5b83\u9762\u5bf9\u7684\u662f\u4e00\u6761\u957f\u957f\u7684\u7248\u672c\u94fe\uff0c\u5b83\u5e94\u8be5\u8bfb\u53d6\u54ea\u4e2a\u7248\u672c\u7684\u6570\u636e\u5462\uff1f\u8fd9\u5c31\u5f15\u51fa\u4e86MVCC\u7684\u53e6\u4e00\u4e2a\u6838\u5fc3\u88c1\u51b3\u673a\u5236\uff1aRead View\u3002<\/p>\n\n\n\n<p><strong>3.1 Read View\uff08\u8bfb\u89c6\u56fe\uff09<\/strong><\/p>\n\n\n\n<p>\u4f60\u53ef\u4ee5\u5c06Read View\uff08\u8bfb\u89c6\u56fe\uff09\u7406\u89e3\u4e3a\u4e00\u5957\u5728\u7279\u5b9a\u65f6\u523b\u751f\u6210\u7684\u201c\u53ef\u89c1\u6027\u89c4\u5219\u5feb\u7167\u201d\u3002\u5f53\u4e00\u4e2a\u4e8b\u52a1\u9700\u8981\u8fdb\u884c\u5feb\u7167\u8bfb\u65f6\uff0c\u6570\u636e\u5e93\u4f1a\u4f9d\u636e\u8fd9\u4e2aRead View\u6765\u626b\u63cf\u7248\u672c\u94fe\uff0c\u5224\u65ad\u54ea\u4e2a\u7248\u672c\u662f\u5bf9\u5f53\u524d\u4e8b\u52a1\u53ef\u89c1\u7684\u3002<\/p>\n\n\n\n<p>Read View\u4e3b\u8981\u5728\u201c\u8bfb\u5df2\u63d0\u4ea4\uff08RC\uff09\u201d\u548c\u201c\u53ef\u91cd\u590d\u8bfb\uff08RR\uff09\u201d\u8fd9\u4e24\u4e2a\u9694\u79bb\u7ea7\u522b\u4e0b\u5de5\u4f5c\u3002\u5b83\u4eec\u7684\u6838\u5fc3\u533a\u522b\uff0c\u5c31\u5728\u4e8e<strong>\u751f\u6210Read View\u7684\u65f6\u673a<\/strong>\u3002<\/p>\n\n\n\n<ul>\n<li><strong>\u8bfb\u5df2\u63d0\u4ea4\uff08RC\uff09<\/strong>\uff1a\u4e8b\u52a1\u4e2d<strong>\u6bcf\u4e00\u6b21<\/strong><code>SELECT<\/code>\u67e5\u8be2\u5f00\u59cb\u65f6\uff0c\u90fd\u4f1a\u91cd\u65b0\u751f\u6210\u4e00\u4e2a\u65b0\u7684Read View\u3002<\/li>\n\n\n\n<li><strong>\u53ef\u91cd\u590d\u8bfb\uff08RR\uff09<\/strong>\uff1a\u4ec5\u5728\u4e8b\u52a1<strong>\u7b2c\u4e00\u6b21<\/strong><code>SELECT<\/code>\u67e5\u8be2\u65f6\uff0c\u751f\u6210\u4e00\u4e2aRead View\uff0c\u5e76\u5728\u6b64\u540e\u7684\u6574\u4e2a\u4e8b\u52a1\u671f\u95f4\u90fd\u590d\u7528\u8fd9\u4e2aRead View\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u4e2a\u533a\u522b\u53ef\u4ee5\u7528\u4e00\u4e2a\u5f62\u8c61\u7684\u6bd4\u55bb\u6765\u63cf\u8ff0\uff1aRC\u9694\u79bb\u7ea7\u522b\u50cf\u4e00\u4e2a\u6bcf\u6b21\u7ea6\u4f1a\u90fd\u6362\u65b0\u5bf9\u8c61\u7684\u201c\u82b1\u5fc3\u5927\u5c11\u201d\uff0c\u4ed6\u773c\u4e2d\u7684\u4e16\u754c\u603b\u662f\u5728\u53d8\u5316\uff1b\u800cRR\u9694\u79bb\u7ea7\u522b\u5219\u50cf\u4e00\u4e2a\u4ece\u59cb\u81f3\u7ec8\u53ea\u8ba4\u521d\u604b\u7684\u201c\u75f4\u60c5\u79cd\u5b50\u201d\uff0c\u65e0\u8bba\u5916\u754c\u5982\u4f55\u53d8\u8fc1\uff0c\u4ed6\u773c\u4e2d\u7684\u604b\u4eba\u6c38\u8fdc\u662f\u6700\u521d\u7684\u6a21\u6837\u3002<\/p>\n\n\n\n<p><strong>3.2 Read View\u4e0e\u8bfb\u5df2\u63d0\u4ea4\uff08RC\uff09<\/strong><\/p>\n\n\n\n<p>\u5728RC\u9694\u79bb\u7ea7\u522b\u4e0b\uff0c\u6bcf\u6b21\u67e5\u8be2\u90fd\u4f1a\u751f\u6210\u65b0\u7684Read View\uff0c\u8fd9\u610f\u5473\u7740\u5728\u4e8b\u52a1\u6267\u884c\u8fc7\u7a0b\u4e2d\uff0c\u53ef\u89c1\u6027\u5224\u65ad\u7684\u57fa\u51c6\u662f\u52a8\u6001\u53d8\u5316\u7684\u3002<\/p>\n\n\n\n<p>\u6211\u4eec\u6765\u770b\u4e00\u4e2a\u4f8b\u5b50\u3002\u5047\u8bbe\u5f53\u524d\u6570\u636e\u5e93\u4e2d\u6709\u4e09\u4e2a\u4e8b\u52a1\u4fee\u6539\u8fc7\u7684\u5386\u53f2\u7248\u672c\uff0c\u72b6\u6001\u5982\u4e0b\uff1a<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"510\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-279-1024x510.png\" alt=\"\" class=\"wp-image-19010\" style=\"width:540px;height:auto\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-279-1024x510.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-279-300x149.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-279-768x382.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-279-830x413.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-279-230x115.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-279-350x174.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-279-480x239.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-279.png 1406w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>\u73b0\u5728\uff0c\u4e00\u4e2a\u65b0\u7684\u4e8b\u52a1A\uff08<code>trx_id<\/code>\u4e3a4\uff09\u542f\u52a8\u4e86\u3002\u5f53\u5b83\u7b2c\u4e00\u6b21\u67e5\u8be2<code>x<\/code>\u7684\u503c\u65f6\uff0cMySQL\u4f1a\u521b\u5efa\u4e00\u4e2aRead View\u3002\u6b64\u65f6\uff0c\u6d3b\u8dc3\uff08\u672a\u63d0\u4ea4\uff09\u7684\u4e8b\u52a1ID\u96c6\u5408\u662f<code>m_ids = {2, 3}<\/code>\u3002\u4e8b\u52a1A\u4f1a\u6cbf\u7740\u7248\u672c\u94fe\u4ece\u6700\u65b0\u7248\u672c\u5f00\u59cb\u67e5\u627e\uff0c\u5b83\u4f1a\u8df3\u8fc7<code>trx_id<\/code>\u4e3a3\u548c2\u7684\u7248\u672c\uff08\u56e0\u4e3a\u5b83\u4eec\u7684\u4e8b\u52a1ID\u5728\u6d3b\u8dc3\u4e8b\u52a1\u5217\u8868<code>m_ids<\/code>\u4e2d\uff0c\u610f\u5473\u7740\u5b83\u4eec\u662f\u201c\u672a\u63d0\u4ea4\u201d\u6216\u201c\u5e76\u53d1\u201d\u7684\u4e8b\u52a1\uff09\uff0c\u6700\u7ec8\u627e\u5230<code>trx_id<\/code>\u4e3a1\u7684\u7248\u672c\u3002\u8fd9\u4e2a\u7248\u672c\u5df2\u7ecf\u63d0\u4ea4\uff0c\u6240\u4ee5\u4e8b\u52a1A\u8bfb\u5230\u7684<code>x<\/code>\u7684\u503c\u662f10\u3002<a href=\"https:\/\/golangstar.cn\/backend_series\/advanced_interview\/database_mvcc.html#_3-2-read-view\u4e0e\u8bfb\u5df2\u63d0\u4ea4-rc\"><\/a><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"614\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-280-1024x614.png\" alt=\"\" class=\"wp-image-19011\" style=\"width:526px;height:auto\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-280-1024x614.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-280-300x180.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-280-768x460.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-280-830x498.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-280-230x138.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-280-350x210.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-280-480x288.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-280.png 1408w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>\u7d27\u63a5\u7740\uff0c\u4e8b\u52a12\u63d0\u4ea4\u4e86\u3002\u7136\u540e\u4e8b\u52a1A\u5728\u540c\u4e00\u4e2a\u4e8b\u52a1\u5185\u518d\u6b21\u67e5\u8be2<code>x<\/code>\u3002\u7531\u4e8e\u662fRC\u9694\u79bb\u7ea7\u522b\uff0cMySQL\u4f1a<strong>\u91cd\u65b0\u751f\u6210\u4e00\u4e2aRead View<\/strong>\u3002\u6b64\u65f6\uff0c\u6d3b\u8dc3\u4e8b\u52a1\u5217\u8868\u53d8\u6210\u4e86<code>m_ids = {3}<\/code>\u3002\u4e8b\u52a1A\u518d\u6b21\u6cbf\u7740\u7248\u672c\u94fe\u67e5\u627e\uff0c\u5b83\u4f1a\u8df3\u8fc7<code>trx_id<\/code>\u4e3a3\u7684\u7248\u672c\uff0c\u4f46\u5f53\u5b83\u68c0\u67e5\u5230<code>trx_id<\/code>\u4e3a2\u7684\u7248\u672c\u65f6\uff0c\u53d1\u73b02\u5df2\u7ecf\u4e0d\u5728\u65b0\u7684\u6d3b\u8dc3\u5217\u8868<code>m_ids<\/code>\u4e2d\u4e86\uff08\u610f\u5473\u7740\u4e8b\u52a12\u5df2\u63d0\u4ea4\uff09\uff0c\u4e8e\u662f\u5b83\u8bfb\u53d6\u4e86\u8fd9\u4e2a\u7248\u672c\u7684\u6570\u636e\u3002\u56e0\u6b64\uff0c\u4e8b\u52a1A\u8fd9\u6b21\u8bfb\u5230\u7684<code>x<\/code>\u7684\u503c\u662f40\u3002\u8fd9\u5c31\u662f\u201c\u4e0d\u53ef\u91cd\u590d\u8bfb\u201d\u7684\u7531\u6765\u3002<a href=\"https:\/\/golangstar.cn\/backend_series\/advanced_interview\/database_mvcc.html#_3-1-read-view-\u8bfb\u89c6\u56fe\"><\/a><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"622\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-281-1024x622.png\" alt=\"\" class=\"wp-image-19012\" style=\"width:520px;height:auto\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-281-1024x622.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-281-300x182.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-281-768x466.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-281-830x504.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-281-230x140.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-281-350x212.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-281-480x291.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-281.png 1420w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p><strong>3.3 Read View\u4e0e\u53ef\u91cd\u590d\u8bfb\uff08RR\uff09<\/strong><\/p>\n\n\n\n<p>\u5728RR\u9694\u79bb\u7ea7\u522b\u4e0b\uff0cRead View\u5728\u4e8b\u52a1\u7b2c\u4e00\u6b21\u67e5\u8be2\u65f6\u521b\u5efa\uff0c\u5e76\u5728\u6574\u4e2a\u4e8b\u52a1\u671f\u95f4\u4fdd\u6301\u4e0d\u53d8\u3002<\/p>\n\n\n\n<p>\u6211\u4eec\u7528\u540c\u6837\u7684\u4f8b\u5b50\u6765\u8bf4\u660e\u3002\u5f53\u4e8b\u52a1A\uff08ID\u4e3a4\uff09\u7b2c\u4e00\u6b21\u67e5\u8be2\u65f6\uff0c\u521b\u5efa\u4e86\u4e00\u4e2aRead View\uff0c\u5176\u6d3b\u8dc3\u4e8b\u52a1\u5217\u8868\u4e3a<code>m_ids = {2, 3}<\/code>\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"646\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-283-1024x646.png\" alt=\"\" class=\"wp-image-19014\" style=\"width:532px;height:auto\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-283-1024x646.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-283-300x189.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-283-768x485.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-283-830x524.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-283-230x145.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-283-350x221.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-283-480x303.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-283.png 1432w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>\u6b64\u65f6\uff0c\u4e8b\u52a1A\u67e5\u8be2<code>x<\/code>\u7684\u503c\uff0c\u4e0eRC\u7ea7\u522b\u4e0b\u7684\u7b2c\u4e00\u6b21\u67e5\u8be2\u4e00\u6837\uff0c\u5b83\u4f1a\u5ffd\u7565<code>trx_id<\/code>\u4e3a2\u548c3\u7684\u672a\u63d0\u4ea4\u7248\u672c\uff0c\u6700\u7ec8\u8bfb\u5230<code>trx_id<\/code>\u4e3a1\u7684\u7248\u672c\uff0c\u7ed3\u679c\u4e3a<code>x=10<\/code>\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"613\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-284-1024x613.png\" alt=\"\" class=\"wp-image-19015\" style=\"width:562px;height:auto\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-284-1024x613.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-284-300x180.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-284-768x460.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-284-830x497.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-284-230x138.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-284-350x210.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-284-480x287.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-284.png 1386w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>\u63a5\u4e0b\u6765\uff0c\u5373\u4f7f\u4e8b\u52a12\u63d0\u4ea4\u4e86\uff0c\u5f53\u4e8b\u52a1A\u518d\u6b21\u67e5\u8be2<code>x<\/code>\u7684\u503c\u65f6\uff0c\u5b83\u4f7f\u7528\u7684\u4ecd\u7136\u662f\u4e8b\u52a1\u5f00\u59cb\u65f6\u521b\u5efa\u7684\u90a3\u4e2a<strong>\u65e7\u7684Read View<\/strong>\u3002\u5728\u8fd9\u4e2a\u65e7\u7684Read View\u4e2d\uff0c<code>m_ids<\/code>\u4f9d\u7136\u662f<code>{2, 3}<\/code>\u3002\u6240\u4ee5\uff0c\u5bf9\u4e8e\u4e8b\u52a1A\u6765\u8bf4\uff0c\u4e8b\u52a12\u770b\u8d77\u6765\u4ecd\u7136\u662f\u201c\u672a\u63d0\u4ea4\u201d\u7684\uff08\u56e0\u4e3a\u4e8b\u52a12\u7684ID\u5b58\u5728\u4e8e\u5b83\u6301\u6709\u7684\u90a3\u4e2a\u65e7\u7684Read View\u7684<code>m_ids<\/code>\u5217\u8868\u4e2d\uff09\u3002\u56e0\u6b64\uff0c\u5b83\u4f1a\u518d\u6b21\u5ffd\u7565<code>trx_id<\/code>\u4e3a2\u7684\u7248\u672c\uff0c\u6700\u7ec8\u8bfb\u5230\u7684\u7ed3\u679c\u4ecd\u7136\u662f<code>x=10<\/code>\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"547\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-285-1024x547.png\" alt=\"\" class=\"wp-image-19016\" style=\"width:540px;height:auto\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-285-1024x547.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-285-300x160.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-285-768x410.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-285-830x443.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-285-230x123.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-285-350x187.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-285-480x256.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-285.png 1390w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>\u8fd9\u5c31\u662f\u201c\u53ef\u91cd\u590d\u8bfb\u201d\u7684\u5b9e\u73b0\u539f\u7406\u3002\u65e0\u8bba\u5176\u4ed6\u4e8b\u52a1\u5982\u4f55\u63d0\u4ea4\uff0c\u5f53\u524d\u4e8b\u52a1\u7684\u201c\u89c6\u754c\u201d\u5728\u4e8b\u52a1\u5f00\u59cb\u7684\u90a3\u4e00\u523b\u5c31\u5df2\u7ecf\u88ab\u56fa\u5b9a\u4e0b\u6765\u4e86\u3002<\/p>\n\n\n\n<p><strong>3.4 Read View\u5c0f\u7ed3<\/strong><\/p>\n\n\n\n<p>\u4e3a\u4e86\u8ba9\u4f60\u66f4\u6e05\u6670\u5730\u7406\u89e3\uff0c\u6211\u5c06\u4e0a\u8ff0\u8fc7\u7a0b\u603b\u7ed3\u4e3a\u4e24\u5f20\u56fe\u3002<\/p>\n\n\n\n<p>\u8bfb\u5df2\u63d0\u4ea4\uff08RC\uff09\u4e0b\u7684Read View\u53d8\u5316\uff1a<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"556\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-286-1024x556.png\" alt=\"\" class=\"wp-image-19017\" style=\"width:564px;height:auto\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-286-1024x556.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-286-300x163.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-286-768x417.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-286-830x450.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-286-230x125.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-286-350x190.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-286-480x260.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-286.png 1386w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>\u53ef\u91cd\u590d\u8bfb\uff08RR\uff09\u4e0b\u7684Read View\u56fa\u5b9a\uff1a<a href=\"https:\/\/golangstar.cn\/backend_series\/advanced_interview\/database_mvcc.html#_3-4-read-view\u5c0f\u7ed3\"><\/a><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"513\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-287-1024x513.png\" alt=\"\" class=\"wp-image-19018\" style=\"width:554px;height:auto\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-287-1024x513.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-287-300x150.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-287-768x385.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-287-830x416.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-287-230x115.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-287-350x176.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-287-480x241.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-287.png 1392w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>\u5b9e\u9645\u4e0a\uff0c\u4e00\u4e2a\u5b8c\u6574\u7684Read View\u9664\u4e86<code>m_ids<\/code>\uff08\u6d3b\u8dc3\u4e8b\u52a1ID\u5217\u8868\uff09\u5916\uff0c\u8fd8\u5305\u542b\u5176\u4ed6\u51e0\u4e2a\u5173\u952e\u5b57\u6bb5\uff0c\u5171\u540c\u6784\u6210\u4e86\u53ef\u89c1\u6027\u5224\u65ad\u7684\u5b8c\u6574\u903b\u8f91\uff1a<\/p>\n\n\n\n<ul>\n<li><code>m_up_limit_id<\/code>\uff1a<code>m_ids<\/code>\u5217\u8868\u4e2d\u7684\u6700\u5c0f\u4e8b\u52a1ID\u3002\u4efb\u4f55<code>trx_id<\/code>\u5c0f\u4e8e\u6b64\u503c\u7684\u7248\u672c\uff0c\u90fd\u8868\u793a\u662f\u201c\u5df2\u63d0\u4ea4\u201d\u7684\uff0c\u56e0\u6b64\u53ef\u89c1\u3002<\/li>\n\n\n\n<li><code>m_low_limit_id<\/code>\uff1a\u5f53\u524d\u7cfb\u7edf\u4e2d\u4e0b\u4e00\u4e2a\u5c06\u88ab\u5206\u914d\u7684\u4e8b\u52a1ID\u3002\u4efb\u4f55<code>trx_id<\/code>\u5927\u4e8e\u7b49\u4e8e\u6b64\u503c\u7684\u7248\u672c\uff0c\u90fd\u8868\u793a\u662f\u201c\u672a\u6765\u201d\u7684\u4e8b\u52a1\uff0c\u56e0\u6b64\u4e0d\u53ef\u89c1\u3002<\/li>\n\n\n\n<li><code>m_creator_trx_id<\/code>\uff1a\u521b\u5efa\u8be5Read View\u7684\u4e8b\u52a1\u81ea\u8eab\u7684ID\u3002\u81ea\u8eab\u7684\u4fee\u6539\u603b\u662f\u53ef\u89c1\u7684\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u53ef\u89c1\u6027\u5224\u65ad\u7684\u5b8c\u6574\u89c4\u5219\u53ef\u4ee5\u6982\u62ec\u4e3a\uff1a<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"285\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-288-1024x285.png\" alt=\"\" class=\"wp-image-19019\" style=\"width:592px;height:auto\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-288-1024x285.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-288-300x83.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-288-768x214.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-288-830x231.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-288-230x64.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-288-350x97.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-288-480x133.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-288.png 1388w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<p>\u5bf9\u4e8e\u4e00\u4e2a\u7248\u672c\u94fe\u4e0a\u7684\u6570\u636e\u884c\uff0c\u5176<code>trx_id<\/code>\u4f1a\u4e0eRead View\u7684\u8fd9\u51e0\u4e2a\u5b57\u6bb5\u8fdb\u884c\u6bd4\u8f83\uff0c\u4ee5\u786e\u5b9a\u5176\u662f\u5426\u53ef\u89c1\u3002\u4e0d\u8fc7\uff0c\u5728\u9762\u8bd5\u4e2d\uff0c\u4f60\u53ea\u9700\u8981\u8bb0\u4f4f\u6838\u5fc3\u903b\u8f91\u2014\u2014<code>m_ids<\/code>\u548cRead View\u7684\u521b\u5efa\u65f6\u673a\u2014\u2014\u5c31\u8db3\u4ee5\u7406\u89e3MVCC\u7684\u7cbe\u9ad3\u4e86\u3002<\/p>\n\n\n\n<p>\u3000<\/p>\n\n\n\n<p><strong>4. \u9762\u8bd5\u5b9e\u6218\u6307\u5357<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u638c\u63e1\u4e86\u524d\u9762\u7684\u57fa\u7840\u77e5\u8bc6\uff0c\u6211\u4eec\u6765\u770b\u770b\u5728\u9762\u8bd5\u4e2d\u5982\u4f55\u5c06\u8fd9\u4e9b\u77e5\u8bc6\u8f6c\u5316\u4e3a\u4f60\u7684\u4f18\u52bf\u3002<\/p>\n\n\n\n<p>\u9996\u5148\uff0c\u4f60\u5fc5\u987b\u6e05\u695a\u81ea\u5df1\u516c\u53f8\u751f\u4ea7\u73af\u5883\u6570\u636e\u5e93\u7684\u9694\u79bb\u7ea7\u522b\u3002\u5982\u679c\u4e0d\u662f\u9ed8\u8ba4\u7684RR\uff0c\u90a3\u4f60\u4e00\u5b9a\u8981\u641e\u6e05\u695a\u4e3a\u4ec0\u4e48\u8981\u505a\u8fd9\u6837\u7684\u8c03\u6574\uff0c\u8fd9\u672c\u8eab\u5c31\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u5b9e\u8df5\u6848\u4f8b\u3002<\/p>\n\n\n\n<p>\u9762\u8bd5\u5b98\u53ef\u80fd\u4f1a\u73b0\u573a\u6784\u9020\u4e00\u4e2a\u5e76\u53d1\u573a\u666f\u6765\u8003\u5bdf\u4f60\u3002\u6211\u7684\u5efa\u8bae\u662f\uff0c\u5bf9\u8fd9\u7c7b\u95ee\u9898\u63d0\u524d\u505a\u597d\u5fc3\u7406\u51c6\u5907\u3002\u5982\u679c\u4e00\u65f6\u53cd\u5e94\u4e0d\u8fc7\u6765\uff0c\u4e0d\u8981\u614c\u5f20\uff0c\u53ef\u4ee5\u793c\u8c8c\u5730\u8bf7\u9762\u8bd5\u5b98\u6162\u901f\u590d\u8ff0\u4e00\u904d\u95ee\u9898\uff0c\u751a\u81f3\u53ef\u4ee5\u4e3b\u52a8\u8bf7\u6c42\u4f7f\u7528\u7eb8\u7b14\uff0c\u5c06\u7248\u672c\u94fe\u548cRead View\u7684\u6f14\u53d8\u8fc7\u7a0b\u753b\u51fa\u6765\u518d\u5206\u6790\uff0c\u8fd9\u4e0d\u4ec5\u80fd\u5e2e\u52a9\u4f60\u7406\u6e05\u601d\u8def\uff0c\u8fd8\u80fd\u5411\u9762\u8bd5\u5b98\u5c55\u793a\u4f60\u624e\u5b9e\u3001\u4e25\u8c28\u7684\u5206\u6790\u80fd\u529b\u3002<\/p>\n\n\n\n<p><strong>4.1 \u57fa\u672c\u601d\u8def<\/strong><\/p>\n\n\n\n<p>\u5f53\u9762\u8bd5\u5b98\u4ece\u9501\u7684\u95ee\u9898\u8fc7\u6e21\u5230MVCC\uff0c\u95ee\u201c\u4e3a\u4ec0\u4e48\u6709\u4e86\u9501\u8fd8\u9700\u8981MVCC\u201d\u65f6\uff0c\u4f60\u7684\u56de\u7b54\u8981\u7a81\u51fa\u5173\u952e\u8bcd\uff1a<strong>\u907f\u514d\u8bfb\u5199\u963b\u585e\uff0c\u5b9e\u73b0\u8bfb\u5199\u5e76\u53d1<\/strong>\u3002<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u201c\u5355\u7eaf\u4f7f\u7528\u9501\u673a\u5236\uff0c\u5e76\u53d1\u6027\u80fd\u4f1a\u5f88\u5dee\u3002\u5373\u4f7f\u662f\u8bfb\u5199\u9501\uff0c\u8bfb\u548c\u5199\u64cd\u4f5c\u4e4b\u95f4\u4ecd\u7136\u662f\u4e92\u65a5\u7684\u3002\u6570\u636e\u5e93\u4f5c\u4e3a\u9ad8\u6027\u80fd\u4e2d\u95f4\u4ef6\uff0c\u5982\u679c\u4e00\u4e2a\u5199\u64cd\u4f5c\u5c31\u5bfc\u81f4\u6240\u6709\u8bfb\u64cd\u4f5c\u88ab\u963b\u585e\uff0c\u8fd9\u79cd\u6027\u80fd\u635f\u5931\u662f\u65e0\u6cd5\u63a5\u53d7\u7684\u3002\u56e0\u6b64\uff0cInnoDB\u5f15\u64ce\u5f15\u5165\u4e86MVCC\uff0c\u5176\u6838\u5fc3\u76ee\u7684\u5c31\u662f\u901a\u8fc7\u7a7a\u95f4\u6362\u65f6\u95f4\u7684\u65b9\u5f0f\uff0c\u5b9e\u73b0\u8bfb\u5199\u64cd\u4f5c\u7684\u5e76\u53d1\u6267\u884c\uff0c\u6781\u5927\u5730\u63d0\u5347\u4e86\u6570\u636e\u5e93\u7684\u5e76\u53d1\u5904\u7406\u80fd\u529b\u3002\u201d<\/pre>\n\n\n\n<p>\u66f4\u591a\u65f6\u5019\uff0c\u9762\u8bd5\u5b98\u4f1a\u76f4\u63a5\u63d0\u95eeMVCC\u672c\u8eab\u3002\u8fd9\u65f6\uff0c\u4f60\u53ef\u4ee5\u6309\u7167\u201c<strong>\u5b9a\u4e49 -> \u5b9e\u73b0\u673a\u5236 -> \u5173\u8054\u9694\u79bb\u7ea7\u522b<\/strong>\u201d\u7684\u903b\u8f91\u987a\u5e8f\uff0c\u7b80\u660e\u627c\u8981\u5730\u56de\u7b54\uff1a<a href=\"https:\/\/golangstar.cn\/backend_series\/advanced_interview\/database_mvcc.html#_4-1-\u57fa\u672c\u601d\u8def\"><\/a><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u201cMVCC\u662fMySQL InnoDB\u5f15\u64ce\u7528\u4e8e\u5b9e\u73b0\u9ad8\u5e76\u53d1\u8bbf\u95ee\u7684\u4e00\u79cd\u534f\u8bae\u3002\u5b83\u7684\u6838\u5fc3\u5b9e\u73b0\u4e3b\u8981\u4f9d\u8d56\u4e8e\u4e24\u5927\u7ec4\u4ef6\uff1a\u7248\u672c\u94fe\uff08Version Chain\uff09\u548c\u8bfb\u89c6\u56fe\uff08Read View\uff09\u3002<br><br>\u9996\u5148\uff0c\u5728InnoDB\u4e2d\uff0c\u6bcf\u4e00\u884c\u6570\u636e\u90fd\u6709\u4e24\u4e2a\u9690\u85cf\u5217\uff1atrx_id\uff08\u6700\u540e\u4fee\u6539\u8be5\u884c\u7684\u4e8b\u52a1ID\uff09\u548croll_ptr\uff08\u56de\u6eda\u6307\u9488\uff09\u3002\u901a\u8fc7\u56de\u6eda\u6307\u9488\uff0cInnoDB\u5c06\u4e00\u884c\u6570\u636e\u7684\u591a\u4e2a\u5386\u53f2\u7248\u672c\u5728undo log\u4e2d\u4e32\u8054\u8d77\u6765\uff0c\u5f62\u6210\u7248\u672c\u94fe\u3002<br><br>\u5176\u6b21\uff0c\u5f53\u4e00\u4e2a\u4e8b\u52a1\u53d1\u8d77\u5feb\u7167\u8bfb\u65f6\uff0cMVCC\u4f1a\u6839\u636e\u8be5\u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b\uff08\u8bfb\u5df2\u63d0\u4ea4\u6216\u53ef\u91cd\u590d\u8bfb\uff09\u751f\u6210\u4e00\u4e2aRead View\u3002\u8fd9\u4e2aRead View\u5b9a\u4e49\u4e86\u4e00\u5957\u53ef\u89c1\u6027\u89c4\u5219\uff0c\u4e8b\u52a1\u4f1a\u7528\u8fd9\u4e2aRead View\u53bb\u5339\u914d\u7248\u672c\u94fe\uff0c\u4ece\u800c\u627e\u5230\u5bf9\u5f53\u524d\u4e8b\u52a1\u53ef\u89c1\u7684\u90a3\u4e2a\u7279\u5b9a\u7248\u672c\u7684\u6570\u636e\u3002\u201d<\/pre>\n\n\n\n<p>\u8fd9\u4e2a\u56de\u7b54\u975e\u5e38\u7b80\u6d01\uff0c\u4f46\u8986\u76d6\u4e86\u6240\u6709\u5173\u952e\u70b9\uff0c\u5e76\u4e14\u4e3a\u9762\u8bd5\u5b98\u7684\u8ffd\u95ee\u7559\u4e0b\u4e86\u5f15\u5b50\u3002<\/p>\n\n\n\n<p><strong>4.2 \u4eae\u70b9\u65b9\u6848\uff1a\u63a8\u52a8\u9694\u79bb\u7ea7\u522b\u8c03\u6574<\/strong><\/p>\n\n\n\n<p>\u8fd9\u662f\u4e00\u4e2a\u53ef\u4ee5\u5145\u5206\u5c55\u793a\u4f60\u5b9e\u8df5\u7ecf\u9a8c\u548c\u601d\u8003\u6df1\u5ea6\u7684\u4eae\u70b9\u3002\u4f60\u53ef\u4ee5\u63cf\u8ff0\u4f60\u5982\u4f55\u63a8\u52a8\u516c\u53f8\u5c06\u6570\u636e\u5e93\u9694\u79bb\u7ea7\u522b\u4ece\u9ed8\u8ba4\u7684RR\u8c03\u6574\u4e3aRC\u3002<\/p>\n\n\n\n<p>\u4f60\u9700\u8981\u8bf4\u6e05\u695a\u4e24\u70b9\uff1a<\/p>\n\n\n\n<ol>\n<li>\u4e3a\u4ec0\u4e48\u8981\u628a\u9ed8\u8ba4\u7684RR\u964d\u7ea7\u4e3aRC\uff1f<\/li>\n\n\n\n<li>\u964d\u7ea7\u540e\uff0c\u5982\u679c\u771f\u7684\u9047\u5230\u9700\u8981RR\u7279\u6027\u7684\u573a\u666f\uff0c\u8be5\u5982\u4f55\u5904\u7406\uff1f<\/li>\n<\/ol>\n\n\n\n<p>\u4f60\u53ef\u4ee5\u8fd9\u6837\u7ec4\u7ec7\u4f60\u7684\u56de\u7b54\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u201c\u5728\u6211\u4e4b\u524d\u53c2\u4e0e\u7684\u4e00\u4e2a\u9879\u76ee\u4e2d\uff0c\u6211\u53d1\u73b0\u6211\u4eec\u6570\u636e\u5e93\u666e\u904d\u4f7f\u7528\u7684\u662fMySQL\u9ed8\u8ba4\u7684\u2018\u53ef\u91cd\u590d\u8bfb\u2019\uff08RR\uff09\u9694\u79bb\u7ea7\u522b\u3002\u4f46\u7ecf\u8fc7\u6df1\u5165\u7684\u4e1a\u52a1\u573a\u666f\u5206\u6790\u540e\uff0c\u6211\u53d1\u73b0\u7edd\u5927\u591a\u6570\u4e8b\u52a1\u5e76\u4e0d\u9700\u8981\u2018\u53ef\u91cd\u590d\u8bfb\u2019\u7684\u7279\u6027\uff0c\u6bd4\u5982\u4e00\u4e2a\u4e8b\u52a1\u5185\u5bf9\u540c\u4e00\u6570\u636e\u7684\u591a\u6b21\u8bfb\u53d6\u51e0\u4e4e\u4e0d\u5b58\u5728\u3002<br><br>\u4e0e\u6b64\u540c\u65f6\uff0c\u4f7f\u7528RR\u7ea7\u522b\u5374\u5e26\u6765\u4e86\u4e00\u4e9b\u5b9e\u9645\u95ee\u9898\u3002\u9996\u5148\uff0cRR\u7ea7\u522b\u7531\u4e8e\u4e34\u952e\u9501\u7684\u5b58\u5728\uff0c\u6bd4RC\u7ea7\u522b\u66f4\u5bb9\u6613\u5728\u5e76\u53d1\u5199\u5165\u65f6\u5f15\u53d1\u95f4\u9699\u9501\u5bfc\u81f4\u7684\u6b7b\u9501\u3002\u6211\u4eec\u7ebf\u4e0a\u4e5f\u786e\u5b9e\u9047\u5230\u8fc7\u56e0\u6b64\u4ea7\u751f\u7684\u68d8\u624b\u6b7b\u9501\u95ee\u9898\u3002\u5176\u6b21\uff0c\u4ece\u6027\u80fd\u89d2\u5ea6\u770b\uff0cRC\u7ea7\u522b\u4e0b\uff0c\u4e8b\u52a1\u63d0\u4ea4\u540e\u4f1a\u66f4\u5feb\u5730\u91ca\u653e\u9501\uff0c\u5e76\u4e14undo log\u7684\u4fdd\u7559\u94fe\u6761\u901a\u5e38\u66f4\u77ed\uff0c\u8fd9\u90fd\u610f\u5473\u7740RC\u7ea7\u522b\u80fd\u63d0\u4f9b\u66f4\u597d\u7684\u5e76\u53d1\u6027\u80fd\u3002<br><br>\u57fa\u4e8e\u8fd9\u4e9b\u8003\u8651\u2014\u2014\u4e1a\u52a1\u4e0d\u9700\u8981\u3001\u5b58\u5728\u6b7b\u9501\u98ce\u9669\u3001\u6027\u80fd\u66f4\u4f18\u2014\u2014\u6211\u4e3b\u5bfc\u5e76\u63a8\u52a8\u4e86\u516c\u53f8\u6570\u636e\u5e93\u9694\u79bb\u7ea7\u522b\u7684\u8c03\u6574\uff0c\u5c06\u65b0\u4e1a\u52a1\u7684\u9ed8\u8ba4\u7ea7\u522b\u4eceRR\u964d\u7ea7\u4e3aRC\uff0c\u4ece\u800c\u63d0\u5347\u4e86\u7cfb\u7edf\u7684\u6574\u4f53\u6027\u80fd\u548c\u7a33\u5b9a\u6027\u3002\u201d<\/pre>\n\n\n\n<p>\u6b64\u65f6\uff0c\u9762\u8bd5\u5b98\u5f88\u53ef\u80fd\u4f1a\u8ffd\u95ee\uff1a\u201c\u8fd9\u4e2a\u65b9\u6848\u5f88\u597d\uff0c\u4f46\u8c03\u6574\u4e4b\u540e\uff0c\u5982\u679c\u67d0\u4e2a\u7279\u6b8a\u4e1a\u52a1\u786e\u5b9e\u9700\u8981\u53ef\u91cd\u590d\u8bfb\u7684\u7279\u6027\uff0c\u4f60\u600e\u4e48\u529e\uff1f\u201d<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u201c\u8fd9\u662f\u4e00\u4e2a\u975e\u5e38\u597d\u7684\u95ee\u9898\uff0c\u6211\u4eec\u5728\u63a8\u8fdb\u65f6\u4e5f\u5145\u5206\u8003\u8651\u4e86\u8fd9\u4e00\u70b9\u3002\u6211\u4eec\u7684\u89e3\u51b3\u65b9\u6848\u662f\u5206\u5c42\u5904\u7406\uff1a<br><br>\u9996\u5148\uff0c\u6211\u4eec\u4f1a\u4f18\u5148\u5c1d\u8bd5\u4ece\u4e1a\u52a1\u903b\u8f91\u5c42\u9762\u8fdb\u884c\u6539\u9020\u3002\u5f88\u591a\u6240\u8c13\u7684\u2018\u53ef\u91cd\u590d\u8bfb\u2019\u9700\u6c42\uff0c\u5176\u5b9e\u662f\u53ef\u4ee5\u901a\u8fc7\u4f18\u5316\u4ee3\u7801\u6765\u6ee1\u8db3\u7684\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4e00\u4e2a\u4e1a\u52a1\u6d41\u7a0b\u4e2d\u9700\u8981\u591a\u6b21\u4f7f\u7528\u540c\u4e00\u4efd\u6570\u636e\uff0c\u6211\u4eec\u5b8c\u5168\u53ef\u4ee5\u5728\u7b2c\u4e00\u6b21\u8bfb\u53d6\u540e\u5c06\u7ed3\u679c\u5728\u5e94\u7528\u5c42\u9762\u7f13\u5b58\u8d77\u6765\uff08\u6bd4\u5982\u653e\u5728\u4e00\u4e2a\u53d8\u91cf\u91cc\uff09\uff0c\u4f9b\u540e\u7eed\u6d41\u7a0b\u4f7f\u7528\uff0c\u8fd9\u6837\u5c31\u81ea\u7136\u907f\u514d\u4e86\u5bf9\u6570\u636e\u5e93\u7684\u591a\u6b21\u67e5\u8be2\u3002<br><br>\u81f3\u4e8e\u5e7b\u8bfb\uff0c\u5728\u7edd\u5927\u591a\u6570\u4e92\u8054\u7f51\u4e1a\u52a1\u4e2d\uff0c\u5b83\u901a\u5e38\u4e0d\u88ab\u89c6\u4e3a\u4e00\u4e2a\u4e25\u91cd\u7684\u95ee\u9898\u3002\u539f\u56e0\u6709\u4e8c\uff1a\u4e00\u662f\u4e1a\u52a1\u4ee3\u7801\u5f88\u96be\u533a\u5206\u8bfb\u5230\u7684\u65b0\u6570\u636e\u662f\u5e7b\u8bfb\uff0c\u8fd8\u662f\u5728\u4e8b\u52a1\u5f00\u59cb\u524d\u5c31\u5df2\u5b58\u5728\u7684\u6570\u636e\u3002\u6bd4\u5982\u4f60\u5728\u4e8b\u52a1 A \u91cc\u9762\u8bfb\u5230\u4e86\u4e00\u6761\u6570\u636e\uff0c\u4f60\u5224\u65ad\u4e0d\u51fa\u6765\u5b83\u662f\u5728\u4e8b\u52a1 A \u5f00\u59cb\u4e4b\u524d\u5c31\u63d2\u5165\u7684\uff0c\u8fd8\u662f\u5728\u4e8b\u52a1 A \u5f00\u59cb\u4e4b\u540e\uff0c\u4e8b\u52a1 B \u624d\u63d2\u5165\u5e76\u4e14\u63d0\u4ea4\u7684\u3002<\/pre>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"529\" src=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-289-1024x529.png\" alt=\"\" class=\"wp-image-19020\" style=\"width:490px;height:auto\" srcset=\"https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-289-1024x529.png 1024w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-289-300x155.png 300w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-289-768x397.png 768w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-289-830x429.png 830w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-289-230x119.png 230w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-289-350x181.png 350w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-289-480x248.png 480w, https:\/\/92it.top\/wp-content\/uploads\/2025\/08\/image-289.png 1406w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<pre class=\"wp-block-preformatted\">\u4e8c\u662f\u4e8b\u52a1\u7684\u63d0\u4ea4\u901a\u5e38\u610f\u5473\u7740\u4e00\u7b14\u4e1a\u52a1\u903b\u8f91\u7684\u5b8c\u7ed3\u3002\u5982\u679c\u4e8b\u52a1A\u8bfb\u5230\u4e86\u4e8b\u52a1B\u65b0\u63d2\u5165\u5e76\u5df2\u63d0\u4ea4\u7684\u6570\u636e\uff0c\u4ece\u4e1a\u52a1\u89d2\u5ea6\u770b\uff0c\u53ef\u4ee5\u8ba4\u4e3a\u4e8b\u52a1B\u6240\u4ee3\u8868\u7684\u4e1a\u52a1\u5df2\u7ecf\u5b8c\u6210\u4e86\uff0c\u90a3\u4e48\u4e8b\u52a1A\u8bfb\u5230\u8fd9\u4e2a\u201c\u65b0\u201d\u7ed3\u679c\u4e5f\u662f\u5408\u4e4e\u903b\u8f91\u7684\u3002<br>\u5f53\u7136\uff0c\u5982\u679c\u9047\u5230\u975e\u5e38\u6781\u7aef\u3001\u65e0\u6cd5\u901a\u8fc7\u4e1a\u52a1\u6539\u9020\u6765\u89e3\u51b3\u7684\u573a\u666f\uff0c\u6211\u4eec\u8fd8\u6709\u6700\u540e\u7684\u515c\u5e95\u65b9\u6848\uff1a\u5728\u4ee3\u7801\u4e2d\u4e3a\u5355\u4e2a\u4e8b\u52a1\u663e\u5f0f\u6307\u5b9a\u9694\u79bb\u7ea7\u522b\u3002\u6211\u4e4b\u524d\u8c03\u6574\u7684\u662f\u6570\u636e\u5e93\u7684\u5168\u5c40\u9ed8\u8ba4\u9694\u79bb\u7ea7\u522b\uff0c\u4f46MySQL\u5141\u8bb8\u5728Session\u7ea7\u522b\uff0c\u751a\u81f3\u662f\u5355\u4e2a\u4e8b\u52a1\u7ea7\u522b\u901a\u8fc7SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;\u6765\u52a8\u6001\u8bbe\u7f6e\u9694\u79bb\u7ea7\u522b\u3002\u8fd9\u6837\u65e2\u80fd\u8ba9\u7edd\u5927\u591a\u6570\u4e1a\u52a1\u4eab\u53d7RC\u7ea7\u522b\u5e26\u6765\u7684\u6574\u4f53\u6027\u80fd\u63d0\u5347\uff0c\u53c8\u80fd\u4ee5\u6700\u5c0f\u7684\u4ee3\u4ef7\u7075\u6d3b\u5e94\u5bf9\u4e2a\u522b\u7279\u6b8a\u9700\u6c42\uff0c\u5b9e\u73b0\u4e86\u5168\u5c40\u6700\u4f18\u548c\u5c40\u90e8\u6700\u4f18\u7684\u7edf\u4e00\u3002\u201d<\/pre>\n\n\n\n<p>\u3000<\/p>\n\n\n\n<p><strong>5. \u5c0f\u7ed3<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u8fd9\u7bc7\u6587\u7ae0\u6211\u4eec\u6df1\u5165\u63a2\u8ba8\u4e86MVCC\u7684\u539f\u7406\u4e0e\u5b9e\u8df5\uff0c\u6211\u4e3a\u4f60\u68b3\u7406\u4e00\u4e0b\u6838\u5fc3\u8981\u70b9\uff0c\u65b9\u4fbf\u4f60\u8bb0\u5fc6\u548c\u590d\u4e60\uff1a<\/p>\n\n\n\n<ol>\n<li><strong>\u4e3a\u4f55\u9700\u8981MVCC<\/strong>\uff1a\u5728\u5df2\u6709\u9501\u7684\u60c5\u51b5\u4e0b\uff0c\u6838\u5fc3\u662f\u4e3a\u4e86\u5b9e\u73b0<strong>\u8bfb\u5199\u5e76\u53d1<\/strong>\uff0c\u907f\u514d\u8bfb\u5199\u64cd\u4f5c\u76f8\u4e92\u963b\u585e\uff0c\u63d0\u5347\u6027\u80fd\u3002<\/li>\n\n\n\n<li><strong>\u6838\u5fc3\u6982\u5ff5<\/strong>\uff1a\u5fc5\u987b\u7262\u8bb0\u56db\u79cd\u9694\u79bb\u7ea7\u522b\uff08\u672a\u63d0\u4ea4\u8bfb\u3001\u5df2\u63d0\u4ea4\u8bfb\u3001\u53ef\u91cd\u590d\u8bfb\u3001\u4e32\u884c\u5316\uff09\u548c\u4e09\u79cd\u8bfb\u5f02\u5e38\uff08\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u3001\u5e7b\u8bfb\uff09\u3002<\/li>\n\n\n\n<li><strong>\u5b9e\u73b0\u539f\u7406<\/strong>\uff1a\u7406\u89e3MVCC\u5982\u4f55\u901a\u8fc7<code>trx_id<\/code>\u548c<code>roll_ptr<\/code>\u5728<code>undo log<\/code>\u4e2d\u6784\u5efa<strong>\u7248\u672c\u94fe<\/strong>\u3002<\/li>\n\n\n\n<li><strong>\u5173\u952e\u673a\u5236<\/strong>\uff1a\u7406\u89e3<strong>Read View<\/strong>\u662f\u5982\u4f55\u5728\u4e0d\u540c\u9694\u79bb\u7ea7\u522b\uff08RC\u548cRR\uff09\u4e0b\u5de5\u4f5c\u7684\uff0c\u5c24\u5176\u662f\u5176<strong>\u521b\u5efa\u65f6\u673a<\/strong>\u7684\u4e0d\u540c\uff0c\u662f\u533a\u5206\u4e8c\u8005\u7684\u5173\u952e\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u6700\u540e\uff0c\u6211\u4e3a\u4f60\u51c6\u5907\u7684\u201c\u8c03\u6574\u9694\u79bb\u7ea7\u522b\u201d\u7684\u4eae\u70b9\u65b9\u6848\uff0c\u5728\u9762\u8bd5\u65f6\u8981\u6293\u4f4f\u4e24\u4e2a\u5173\u952e\u70b9\uff1a<\/p>\n\n\n\n<ul>\n<li><strong>\u4e3a\u4ec0\u4e48\u8981\u8c03\u6574\u4e3aRC\uff1f<\/strong> \u4e24\u4e2a\u4e3b\u8981\u539f\u56e0\uff1a\u4e1a\u52a1\u7528\u4e0d\u4e0aRR\u7684\u7279\u6027\uff1b\u63d0\u5347\u6027\u80fd\u5e76\u51cf\u5c11\u6b7b\u9501\u98ce\u9669\u3002<\/li>\n\n\n\n<li><strong>\u8c03\u6574\u540e\u5982\u4f55\u5e94\u5bf9\u7279\u6b8a\u9700\u6c42\uff1f<\/strong> \u9996\u9009\u65b9\u6848\u662f\u6539\u9020\u4e1a\u52a1\u903b\u8f91\uff0c\u515c\u5e95\u65b9\u6848\u662f\u5728\u4ee3\u7801\u4e2d\u4e3a\u5355\u4e2a\u4e8b\u52a1\u663e\u5f0f\u6307\u5b9a\u9694\u79bb\u7ea7\u522b\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u901a\u8fc7\u8fd9\u7bc7\u6587\u7ae0\u5e0c\u671b\u80fd\u8ba9\u4f60\u5bf9MVCC\u6709\u4e00\u4e2a\u5168\u65b0\u7684\u3001\u66f4\u6df1\u523b\u7684\u7406\u89e3\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4eca\u5929\u6211\u4eec\u6765\u804a\u4e00\u4e2aMySQL\u9762\u8bd5\u4e2d\u7684\u9ad8\u9891\u8003\u70b9\uff0c\u4e5f\u662f\u6bcf\u4e00\u4f4d\u540e\u7aef\u5f00\u53d1\u8005\u90fd\u5e94\u8be5\u6df1\u5ea6\u638c\u63e1\u7684\u6838\u5fc3\u77e5\u8bc6\u2014\u2014MVCC\u534f\u8bae\u3002 M [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"_links":{"self":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/19000"}],"collection":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=19000"}],"version-history":[{"count":2,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/19000\/revisions"}],"predecessor-version":[{"id":19021,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/19000\/revisions\/19021"}],"wp:attachment":[{"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=19000"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=19000"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=19000"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}