{"id":181,"date":"2025-07-13T17:14:00","date_gmt":"2025-07-13T09:14:00","guid":{"rendered":"https:\/\/yingjun.run\/?p=181"},"modified":"2025-07-14T13:11:39","modified_gmt":"2025-07-14T05:11:39","slug":"mysql","status":"publish","type":"post","link":"https:\/\/yingjun.run\/index.php\/2025\/07\/13\/mysql\/","title":{"rendered":"MySQL"},"content":{"rendered":"<h3><span class=\"ez-toc-section\" id=\"%E4%BB%80%E4%B9%88%E6%98%AF%E5%85%B3%E7%B3%BB%E5%9E%8B%E6%95%B0%E6%8D%AE%E5%BA%93%EF%BC%9F\"><\/span>\u4ec0\u4e48\u662f\u5173\u7cfb\u578b\u6570\u636e\u5e93\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u987e\u540d\u601d\u4e49\uff0c\u5173\u7cfb\u578b\u6570\u636e\u5e93\uff08RDB\uff0cRelational Database\uff09\u5c31\u662f\u4e00\u79cd\u5efa\u7acb\u5728\u5173\u7cfb\u6a21\u578b\u7684\u57fa\u7840\u4e0a\u7684\u6570\u636e\u5e93\u3002\u5173\u7cfb\u6a21\u578b\u8868\u660e\u4e86\u6570\u636e\u5e93\u4e2d\u6240\u5b58\u50a8\u7684\u6570\u636e\u4e4b\u95f4\u7684\u8054\u7cfb\uff08\u4e00\u5bf9\u4e00\u3001\u4e00\u5bf9\u591a\u3001\u591a\u5bf9\u591a\uff09\u3002<br \/>\n<strong>\u6709\u54ea\u4e9b\u5e38\u89c1\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\u5462\uff1f<\/strong><br \/>\nMySQL\u3001PostgreSQL\u3001Oracle\u3001SQL Server\u3001SQLite\uff08\u5fae\u4fe1\u672c\u5730\u7684\u804a\u5929\u8bb0\u5f55\u7684\u5b58\u50a8\u5c31\u662f\u7528\u7684 SQLite\uff09<\/p>\n<h3><span class=\"ez-toc-section\" id=\"MySQL_%E6%9C%89%E4%BB%80%E4%B9%88%E4%BC%98%E7%82%B9%EF%BC%9F\"><\/span>MySQL \u6709\u4ec0\u4e48\u4f18\u70b9\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/yingjun.run\/wp-content\/uploads\/2025\/07\/image-1752397266045.png\" alt=\"file\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E6%95%B4%E6%95%B0%E7%B1%BB%E5%9E%8B%E7%9A%84_UNSIGNED_%E5%B1%9E%E6%80%A7%E6%9C%89%E4%BB%80%E4%B9%88%E7%94%A8%EF%BC%9F\"><\/span>\u6574\u6570\u7c7b\u578b\u7684 UNSIGNED \u5c5e\u6027\u6709\u4ec0\u4e48\u7528\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>MySQL \u4e2d\u7684\u6574\u6570\u7c7b\u578b\u53ef\u4ee5\u4f7f\u7528\u53ef\u9009\u7684 UNSIGNED \u5c5e\u6027\u6765\u8868\u793a\u4e0d\u5141\u8bb8\u8d1f\u503c\u7684\u65e0\u7b26\u53f7\u6574\u6570\u3002\u4f7f\u7528 UNSIGNED \u5c5e\u6027\u53ef\u4ee5\u5c06\u6b63\u6574\u6570\u7684\u4e0a\u9650\u63d0\u9ad8\u4e00\u500d\uff0c\u56e0\u4e3a\u5b83\u4e0d\u9700\u8981\u5b58\u50a8\u8d1f\u6570\u503c\u3002<\/p>\n<p>\u4f8b\u5982\uff0c TINYINT UNSIGNED \u7c7b\u578b\u7684\u53d6\u503c\u8303\u56f4\u662f 0 ~ 255\uff0c\u800c\u666e\u901a\u7684 TINYINT \u7c7b\u578b\u7684\u503c\u8303\u56f4\u662f -128 ~ 127\u3002INT UNSIGNED \u7c7b\u578b\u7684\u53d6\u503c\u8303\u56f4\u662f 0 ~ 4,294,967,295\uff0c\u800c\u666e\u901a\u7684 INT \u7c7b\u578b\u7684\u503c\u8303\u56f4\u662f -2,147,483,648 ~ 2,147,483,647\u3002<\/p>\n<p>\u5bf9\u4e8e\u4ece 0 \u5f00\u59cb\u9012\u589e\u7684 ID \u5217\uff0c\u4f7f\u7528 UNSIGNED \u5c5e\u6027\u53ef\u4ee5\u975e\u5e38\u9002\u5408\uff0c\u56e0\u4e3a\u4e0d\u5141\u8bb8\u8d1f\u503c\u5e76\u4e14\u53ef\u4ee5\u62e5\u6709\u66f4\u5927\u7684\u4e0a\u9650\u8303\u56f4\uff0c\u63d0\u4f9b\u4e86\u66f4\u591a\u7684 ID \u503c\u53ef\u7528\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"CHAR_%E5%92%8C_VARCHAR_%E7%9A%84%E5%8C%BA%E5%88%AB%E6%98%AF%E4%BB%80%E4%B9%88%EF%BC%9F\"><\/span>CHAR \u548c VARCHAR \u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>CHAR \u548c VARCHAR \u662f\u6700\u5e38\u7528\u5230\u7684\u5b57\u7b26\u4e32\u7c7b\u578b\uff0c\u4e24\u8005\u7684\u4e3b\u8981\u533a\u522b\u5728\u4e8e\uff1a<strong>CHAR \u662f\u5b9a\u957f\u5b57\u7b26\u4e32\uff0cVARCHAR \u662f\u53d8\u957f\u5b57\u7b26\u4e32\u3002<\/strong><\/p>\n<p>CHAR \u5728\u5b58\u50a8\u65f6\u4f1a\u5728\u53f3\u8fb9\u586b\u5145\u7a7a\u683c\u4ee5\u8fbe\u5230\u6307\u5b9a\u7684\u957f\u5ea6\uff0c\u68c0\u7d22\u65f6\u4f1a\u53bb\u6389\u7a7a\u683c\uff1bVARCHAR \u5728\u5b58\u50a8\u65f6\u9700\u8981\u4f7f\u7528 1 \u6216 2 \u4e2a\u989d\u5916\u5b57\u8282\u8bb0\u5f55\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\uff0c\u68c0\u7d22\u65f6\u4e0d\u9700\u8981\u5904\u7406\u3002<\/p>\n<p>CHAR \u66f4\u9002\u5408\u5b58\u50a8\u957f\u5ea6\u8f83\u77ed\u6216\u8005\u957f\u5ea6\u90fd\u5dee\u4e0d\u591a\u7684\u5b57\u7b26\u4e32\uff0c\u4f8b\u5982 Bcrypt \u7b97\u6cd5\u3001MD5 \u7b97\u6cd5\u52a0\u5bc6\u540e\u7684\u5bc6\u7801\u3001\u8eab\u4efd\u8bc1\u53f7\u7801\u3002VARCHAR \u7c7b\u578b\u9002\u5408\u5b58\u50a8\u957f\u5ea6\u4e0d\u786e\u5b9a\u6216\u8005\u5dee\u5f02\u8f83\u5927\u7684\u5b57\u7b26\u4e32\uff0c\u4f8b\u5982\u7528\u6237\u6635\u79f0\u3001\u6587\u7ae0\u6807\u9898\u7b49\u3002<\/p>\n<p>CHAR(M) \u548c VARCHAR(M) \u7684 M \u90fd\u4ee3\u8868\u80fd\u591f\u4fdd\u5b58\u7684\u5b57\u7b26\u6570\u7684\u6700\u5927\u503c\uff0c\u65e0\u8bba\u662f\u5b57\u6bcd\u3001\u6570\u5b57\u8fd8\u662f\u4e2d\u6587\uff0c\u6bcf\u4e2a\u90fd\u53ea\u5360\u7528\u4e00\u4e2a\u5b57\u7b26<\/p>\n<h3><span class=\"ez-toc-section\" id=\"VARCHAR100%E5%92%8C_VARCHAR10%E7%9A%84%E5%8C%BA%E5%88%AB%E6%98%AF%E4%BB%80%E4%B9%88%EF%BC%9F\"><\/span>VARCHAR(100)\u548c VARCHAR(10)\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>VARCHAR(100)\u548c VARCHAR(10)\u90fd\u662f\u53d8\u957f\u7c7b\u578b\uff0c\u8868\u793a\u80fd\u5b58\u50a8\u6700\u591a 100 \u4e2a\u5b57\u7b26\u548c 10 \u4e2a\u5b57\u7b26\u3002\u56e0\u6b64\uff0cVARCHAR (100) \u53ef\u4ee5\u6ee1\u8db3\u66f4\u5927\u8303\u56f4\u7684\u5b57\u7b26\u5b58\u50a8\u9700\u6c42\uff0c\u6709\u66f4\u597d\u7684\u4e1a\u52a1\u62d3\u5c55\u6027\u3002\u800c VARCHAR(10)\u5b58\u50a8\u8d85\u8fc7 10 \u4e2a\u5b57\u7b26\u65f6\uff0c\u5c31\u9700\u8981\u4fee\u6539\u8868\u7ed3\u6784\u624d\u53ef\u4ee5\u3002<\/p>\n<p>\u867d\u8bf4 VARCHAR(100)\u548c VARCHAR(10)\u80fd\u5b58\u50a8\u7684\u5b57\u7b26\u8303\u56f4\u4e0d\u540c\uff0c\u4f46\u4e8c\u8005\u5b58\u50a8\u76f8\u540c\u7684\u5b57\u7b26\u4e32\uff0c\u6240\u5360\u7528\u78c1\u76d8\u7684\u5b58\u50a8\u7a7a\u95f4\u5176\u5b9e\u662f\u4e00\u6837\u7684\uff0c\u8fd9\u4e5f\u662f\u5f88\u591a\u4eba\u5bb9\u6613\u8bef\u89e3\u7684\u4e00\u70b9\u3002<\/p>\n<p>\u4e0d\u8fc7\uff0cVARCHAR(100) \u4f1a\u6d88\u8017\u66f4\u591a\u7684\u5185\u5b58\u3002\u8fd9\u662f\u56e0\u4e3a VARCHAR \u7c7b\u578b\u5728\u5185\u5b58\u4e2d\u64cd\u4f5c\u65f6\uff0c\u901a\u5e38\u4f1a\u5206\u914d\u56fa\u5b9a\u5927\u5c0f\u7684\u5185\u5b58\u5757\u6765\u4fdd\u5b58\u503c\uff0c\u5373\u4f7f\u7528\u5b57\u7b26\u7c7b\u578b\u4e2d\u5b9a\u4e49\u7684\u957f\u5ea6\u3002\u4f8b\u5982\u5728\u8fdb\u884c\u6392\u5e8f\u7684\u65f6\u5019\uff0cVARCHAR(100)\u662f\u6309\u7167 100 \u8fd9\u4e2a\u957f\u5ea6\u6765\u8fdb\u884c\u7684\uff0c\u4e5f\u5c31\u4f1a\u6d88\u8017\u66f4\u591a\u5185\u5b58\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"DECIMAL_%E5%92%8C_FLOATDOUBLE_%E7%9A%84%E5%8C%BA%E5%88%AB%E6%98%AF%E4%BB%80%E4%B9%88%EF%BC%9F\"><\/span>DECIMAL \u548c FLOAT\/DOUBLE \u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>DECIMAL \u548c FLOAT \u7684\u533a\u522b\u662f\uff1a<strong>DECIMAL \u662f\u5b9a\u70b9\u6570\uff0cFLOAT\/DOUBLE \u662f\u6d6e\u70b9\u6570\u3002DECIMAL \u53ef\u4ee5\u5b58\u50a8\u7cbe\u786e\u7684\u5c0f\u6570\u503c\uff0cFLOAT\/DOUBLE \u53ea\u80fd\u5b58\u50a8\u8fd1\u4f3c\u7684\u5c0f\u6570\u503c\u3002<\/strong><br \/>\nDECIMAL \u7528\u4e8e\u5b58\u50a8\u5177\u6709\u7cbe\u5ea6\u8981\u6c42\u7684\u5c0f\u6570\uff0c\u4f8b\u5982\u4e0e\u8d27\u5e01\u76f8\u5173\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u907f\u514d\u6d6e\u70b9\u6570\u5e26\u6765\u7684\u7cbe\u5ea6\u635f\u5931\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E6%8E%A8%E8%8D%90%E4%BD%BF%E7%94%A8_TEXT_%E5%92%8C_BLOB%EF%BC%9F\"><\/span>\u4e3a\u4ec0\u4e48\u4e0d\u63a8\u8350\u4f7f\u7528 TEXT \u548c BLOB\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>TEXT \u7c7b\u578b\u7c7b\u4f3c\u4e8e CHAR\uff080-255 \u5b57\u8282\uff09\u548c VARCHAR\uff080-65,535 \u5b57\u8282\uff09\uff0c\u4f46\u53ef\u4ee5\u5b58\u50a8\u66f4\u957f\u7684\u5b57\u7b26\u4e32\uff0c\u5373\u957f\u6587\u672c\u6570\u636e\uff0c\u4f8b\u5982\u535a\u5ba2\u5185\u5bb9\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/yingjun.run\/wp-content\/uploads\/2025\/07\/image-1752397406738.png\" alt=\"file\" \/><\/p>\n<p>\u5728\u65e5\u5e38\u5f00\u53d1\u4e2d\uff0c\u5f88\u5c11\u4f7f\u7528 TEXT \u7c7b\u578b\uff0c\u4f46\u5076\u5c14\u4f1a\u7528\u5230\uff0c\u800c BLOB \u7c7b\u578b\u5219\u57fa\u672c\u4e0d\u5e38\u7528\u3002\u5982\u679c\u9884\u671f\u957f\u5ea6\u8303\u56f4\u53ef\u4ee5\u901a\u8fc7 VARCHAR \u6765\u6ee1\u8db3\uff0c\u5efa\u8bae\u907f\u514d\u4f7f\u7528 TEXT\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/yingjun.run\/wp-content\/uploads\/2025\/07\/image-1752397422492.png\" alt=\"file\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"DATETIME_%E5%92%8C_TIMESTAMP_%E7%9A%84%E5%8C%BA%E5%88%AB%E6%98%AF%E4%BB%80%E4%B9%88%EF%BC%9F\"><\/span>DATETIME \u548c TIMESTAMP \u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>DATETIME \u7c7b\u578b\u6ca1\u6709\u65f6\u533a\u4fe1\u606f\uff0cTIMESTAMP \u548c\u65f6\u533a\u6709\u5173\u3002<br \/>\nTIMESTAMP \u53ea\u9700\u8981\u4f7f\u7528 4 \u4e2a\u5b57\u8282\u7684\u5b58\u50a8\u7a7a\u95f4\uff0c\u4f46\u662f DATETIME \u9700\u8981\u8017\u8d39 8 \u4e2a\u5b57\u8282\u7684\u5b58\u50a8\u7a7a\u95f4\u3002\u4f46\u662f\uff0c\u8fd9\u6837\u540c\u6837\u9020\u6210\u4e86\u4e00\u4e2a\u95ee\u9898\uff0cTimestamp \u8868\u793a\u7684\u65f6\u95f4\u8303\u56f4\u66f4\u5c0f\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"MySQL_%E5%9F%BA%E7%A1%80%E6%9E%B6%E6%9E%84\"><\/span>MySQL \u57fa\u7840\u67b6\u6784<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/yingjun.run\/wp-content\/uploads\/2025\/07\/image-1752397518340.png\" alt=\"file\" \/><\/p>\n<p><strong>\u8fde\u63a5\u5668<\/strong>\uff1a \u8eab\u4efd\u8ba4\u8bc1\u548c\u6743\u9650\u76f8\u5173(\u767b\u5f55 MySQL \u7684\u65f6\u5019)\u3002<br \/>\n<strong>\u67e5\u8be2\u7f13\u5b58<\/strong>\uff1a \u6267\u884c\u67e5\u8be2\u8bed\u53e5\u7684\u65f6\u5019\uff0c\u4f1a\u5148\u67e5\u8be2\u7f13\u5b58\uff08MySQL 8.0 \u7248\u672c\u540e\u79fb\u9664\uff0c\u56e0\u4e3a\u8fd9\u4e2a\u529f\u80fd\u4e0d\u592a\u5b9e\u7528\uff09\u3002<br \/>\n<strong>\u5206\u6790\u5668<\/strong>\uff1a \u6ca1\u6709\u547d\u4e2d\u7f13\u5b58\u7684\u8bdd\uff0cSQL \u8bed\u53e5\u5c31\u4f1a\u7ecf\u8fc7\u5206\u6790\u5668\uff0c\u5206\u6790\u5668\u8bf4\u767d\u4e86\u5c31\u662f\u8981\u5148\u770b\u4f60\u7684 SQL \u8bed\u53e5\u8981\u5e72\u561b\uff0c\u518d\u68c0\u67e5\u4f60\u7684 SQL \u8bed\u53e5\u8bed\u6cd5\u662f\u5426\u6b63\u786e\u3002<br \/>\n<strong>\u4f18\u5316\u5668<\/strong>\uff1a \u6309\u7167 MySQL \u8ba4\u4e3a\u6700\u4f18\u7684\u65b9\u6848\u53bb\u6267\u884c\u3002<br \/>\n<strong>\u6267\u884c\u5668<\/strong>\uff1a \u6267\u884c\u8bed\u53e5\uff0c\u7136\u540e\u4ece\u5b58\u50a8\u5f15\u64ce\u8fd4\u56de\u6570\u636e\u3002 \u6267\u884c\u8bed\u53e5\u4e4b\u524d\u4f1a\u5148\u5224\u65ad\u662f\u5426\u6709\u6743\u9650\uff0c\u5982\u679c\u6ca1\u6709\u6743\u9650\u7684\u8bdd\uff0c\u5c31\u4f1a\u62a5\u9519\u3002<br \/>\n<strong>\u63d2\u4ef6\u5f0f\u5b58\u50a8\u5f15\u64ce<\/strong>\uff1a\u4e3b\u8981\u8d1f\u8d23\u6570\u636e\u7684\u5b58\u50a8\u548c\u8bfb\u53d6\uff0c\u91c7\u7528\u7684\u662f\u63d2\u4ef6\u5f0f\u67b6\u6784\uff0c\u652f\u6301 InnoDB\u3001MyISAM\u3001Memory \u7b49\u591a\u79cd\u5b58\u50a8\u5f15\u64ce\u3002InnoDB \u662f MySQL \u7684\u9ed8\u8ba4\u5b58\u50a8\u5f15\u64ce\uff0c\u7edd\u5927\u90e8\u5206\u573a\u666f\u4f7f\u7528 InnoDB \u5c31\u662f\u6700\u597d\u7684\u9009\u62e9<\/p>\n<h3><span class=\"ez-toc-section\" id=\"MySQL_%E5%AD%98%E5%82%A8%E5%BC%95%E6%93%8E\"><\/span>MySQL \u5b58\u50a8\u5f15\u64ce<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>MySQL \u652f\u6301\u54ea\u4e9b\u5b58\u50a8\u5f15\u64ce\uff1f\u9ed8\u8ba4\u4f7f\u7528\u54ea\u4e2a\uff1f<\/p>\n<p>MySQL \u652f\u6301\u591a\u79cd\u5b58\u50a8\u5f15\u64ce\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7 <strong>SHOW ENGINES<\/strong> \u547d\u4ee4\u6765\u67e5\u770b MySQL \u652f\u6301\u7684\u6240\u6709\u5b58\u50a8\u5f15\u64ce\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/yingjun.run\/wp-content\/uploads\/2025\/07\/image-1752397606266.png\" alt=\"file\" \/><\/p>\n<p>\u4ece\u4e0a\u56fe\u6211\u4eec\u53ef\u4ee5\u67e5\u770b\u51fa\uff0c MySQL \u5f53\u524d\u9ed8\u8ba4\u7684\u5b58\u50a8\u5f15\u64ce\u662f InnoDB\u3002\u5e76\u4e14\uff0c\u6240\u6709\u7684\u5b58\u50a8\u5f15\u64ce\u4e2d\u53ea\u6709 InnoDB \u662f\u4e8b\u52a1\u6027\u5b58\u50a8\u5f15\u64ce\uff0c\u4e5f\u5c31\u662f\u8bf4\u53ea\u6709 InnoDB \u652f\u6301\u4e8b\u52a1\u3002<\/p>\n<p>MySQL 5.5.5 \u4e4b\u524d\uff0cMyISAM \u662f MySQL \u7684\u9ed8\u8ba4\u5b58\u50a8\u5f15\u64ce\u30025.5.5 \u7248\u672c\u4e4b\u540e\uff0cInnoDB \u662f MySQL \u7684\u9ed8\u8ba4\u5b58\u50a8\u5f15\u64ce\u3002<\/p>\n<p>\u4f60\u53ef\u4ee5\u901a\u8fc7 SELECT VERSION() \u547d\u4ee4\u67e5\u770b\u4f60\u7684 MySQL \u7248\u672c\u3002<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">mysql&gt; SELECT VERSION();\n+-----------+\n| VERSION() |\n+-----------+\n| 8.0.27    |\n+-----------+\n1 row in set (0.00 sec)<\/code><\/pre>\n<p>\u4f60\u4e5f\u53ef\u4ee5\u901a\u8fc7 SHOW VARIABLES LIKE '%storage_engine%' \u547d\u4ee4\u76f4\u63a5\u67e5\u770b MySQL \u5f53\u524d\u9ed8\u8ba4\u7684\u5b58\u50a8\u5f15\u64ce\u3002<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">mysql&gt; SHOW VARIABLES  LIKE &#039;%storage_engine%&#039;;\n+---------------------------------+-----------+\n| Variable_name                   | Value     |\n+---------------------------------+-----------+\n| default_storage_engine          | InnoDB    |\n| default_tmp_storage_engine      | InnoDB    |\n| disabled_storage_engines        |           |\n| internal_tmp_mem_storage_engine | TempTable |\n+---------------------------------+-----------+\n4 rows in set (0.00 sec)<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"MySQL_%E5%AD%98%E5%82%A8%E5%BC%95%E6%93%8E%E6%9E%B6%E6%9E%84%E4%BA%86%E8%A7%A3%E5%90%97%EF%BC%9F\"><\/span>MySQL \u5b58\u50a8\u5f15\u64ce\u67b6\u6784\u4e86\u89e3\u5417\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>MySQL \u5b58\u50a8\u5f15\u64ce\u91c7\u7528\u7684\u662f <strong>\u63d2\u4ef6\u5f0f\u67b6\u6784 <\/strong>\uff0c\u652f\u6301\u591a\u79cd\u5b58\u50a8\u5f15\u64ce\uff0c\u6211\u4eec\u751a\u81f3\u53ef\u4ee5\u4e3a\u4e0d\u540c\u7684\u6570\u636e\u5e93\u8868\u8bbe\u7f6e\u4e0d\u540c\u7684\u5b58\u50a8\u5f15\u64ce\u4ee5\u9002\u5e94\u4e0d\u540c\u573a\u666f\u7684\u9700\u8981\u3002<strong>\u5b58\u50a8\u5f15\u64ce\u662f\u57fa\u4e8e\u8868\u7684\uff0c\u800c\u4e0d\u662f\u6570\u636e\u5e93<\/strong>\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/yingjun.run\/wp-content\/uploads\/2025\/07\/image-1752397703133.png\" alt=\"file\" \/><\/p>\n<p>\u4f60\u8fd8\u53ef\u4ee5\u6839\u636e MySQL \u5b9a\u4e49\u7684\u5b58\u50a8\u5f15\u64ce\u5b9e\u73b0\u6807\u51c6\u63a5\u53e3\u6765\u7f16\u5199\u4e00\u4e2a\u5c5e\u4e8e\u81ea\u5df1\u7684\u5b58\u50a8\u5f15\u64ce\u3002\u8fd9\u4e9b\u975e\u5b98\u65b9\u63d0\u4f9b\u7684\u5b58\u50a8\u5f15\u64ce\u53ef\u4ee5\u79f0\u4e3a\u7b2c\u4e09\u65b9\u5b58\u50a8\u5f15\u64ce\uff0c\u533a\u522b\u4e8e\u5b98\u65b9\u5b58\u50a8\u5f15\u64ce\u3002\u50cf\u76ee\u524d\u6700\u5e38\u7528\u7684 InnoDB \u5176\u5b9e\u521a\u5f00\u59cb\u5c31\u662f\u4e00\u4e2a\u7b2c\u4e09\u65b9\u5b58\u50a8\u5f15\u64ce\uff0c\u540e\u9762\u7531\u4e8e\u8fc7\u4e8e\u4f18\u79c0\uff0c\u5176\u88ab Oracle \u76f4\u63a5\u6536\u8d2d\u4e86\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"MyISAM_%E5%92%8C_InnoDB_%E6%9C%89%E4%BB%80%E4%B9%88%E5%8C%BA%E5%88%AB%EF%BC%9F\"><\/span>MyISAM \u548c InnoDB \u6709\u4ec0\u4e48\u533a\u522b\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>1\u3001\u662f\u5426\u652f\u6301\u884c\u7ea7\u9501:<\/strong><br \/>\nMyISAM \u53ea\u6709\u8868\u7ea7\u9501(table-level locking)\uff0c\u800c InnoDB \u652f\u6301\u884c\u7ea7\u9501(row-level locking)\u548c\u8868\u7ea7\u9501,\u9ed8\u8ba4\u4e3a\u884c\u7ea7\u9501\u3002<br \/>\n\u4e5f\u5c31\u8bf4\uff0cMyISAM \u4e00\u9501\u5c31\u662f\u9501\u4f4f\u4e86\u6574\u5f20\u8868\uff0c\u8fd9\u5728\u5e76\u53d1\u5199\u7684\u60c5\u51b5\u4e0b\u662f\u591a\u4e48\u6ef4\u61a8\u61a8\u554a\uff01\u8fd9\u4e5f\u662f\u4e3a\u4ec0\u4e48 InnoDB \u5728\u5e76\u53d1\u5199\u7684\u65f6\u5019\uff0c\u6027\u80fd\u66f4\u725b\u76ae\u4e86\uff01<br \/>\n<strong>2\u3001\u662f\u5426\u652f\u6301\u4e8b\u52a1\uff1a<\/strong><br \/>\nMyISAM \u4e0d\u63d0\u4f9b\u4e8b\u52a1\u652f\u6301\u3002InnoDB \u63d0\u4f9b\u4e8b\u52a1\u652f\u6301\uff0c\u5b9e\u73b0\u4e86 SQL \u6807\u51c6\u5b9a\u4e49\u4e86\u56db\u4e2a\u9694\u79bb\u7ea7\u522b\uff0c\u5177\u6709\u63d0\u4ea4(commit)\u548c\u56de\u6eda(rollback)\u4e8b\u52a1\u7684\u80fd\u529b\u3002\u5e76\u4e14\uff0cInnoDB \u9ed8\u8ba4\u4f7f\u7528\u7684 REPEATABLE-READ\uff08\u53ef\u91cd\u8bfb\uff09\u9694\u79bb\u7ea7\u522b\u662f\u53ef\u4ee5\u89e3\u51b3\u5e7b\u8bfb\u95ee\u9898\u53d1\u751f\u7684\uff08\u57fa\u4e8e MVCC \u548c Next-Key Lock\uff09\u3002<br \/>\n<strong>3\u3001\u662f\u5426\u652f\u6301\u5916\u952e\uff1a<\/strong><br \/>\nMyISAM \u4e0d\u652f\u6301\uff0c\u800c InnoDB \u652f\u6301\u3002<\/p>\n<p>\u5916\u952e\u5bf9\u4e8e\u7ef4\u62a4\u6570\u636e\u4e00\u81f4\u6027\u975e\u5e38\u6709\u5e2e\u52a9\uff0c\u4f46\u662f\u5bf9\u6027\u80fd\u6709\u4e00\u5b9a\u7684\u635f\u8017\u3002\u56e0\u6b64\uff0c\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u662f\u4e0d\u5efa\u8bae\u5728\u5b9e\u9645\u751f\u4ea7\u9879\u76ee\u4e2d\u4f7f\u7528\u5916\u952e\u7684\uff0c\u5728\u4e1a\u52a1\u4ee3\u7801\u4e2d\u8fdb\u884c\u7ea6\u675f\u5373\u53ef\uff01<br \/>\n<strong>4\u3001\u662f\u5426\u652f\u6301\u6570\u636e\u5e93\u5f02\u5e38\u5d29\u6e83\u540e\u7684\u5b89\u5168\u6062\u590d\uff1a<\/strong><br \/>\nMyISAM \u4e0d\u652f\u6301\uff0c\u800c InnoDB \u652f\u6301\u3002<\/p>\n<p>\u4f7f\u7528 InnoDB \u7684\u6570\u636e\u5e93\u5728\u5f02\u5e38\u5d29\u6e83\u540e\uff0c\u6570\u636e\u5e93\u91cd\u65b0\u542f\u52a8\u7684\u65f6\u5019\u4f1a\u4fdd\u8bc1\u6570\u636e\u5e93\u6062\u590d\u5230\u5d29\u6e83\u524d\u7684\u72b6\u6001\u3002\u8fd9\u4e2a\u6062\u590d\u7684\u8fc7\u7a0b\u4f9d\u8d56\u4e8e redo log \u3002<\/p>\n<p><strong>5\u3001\u662f\u5426\u652f\u6301 MVCC\uff1a<\/strong><br \/>\nMyISAM \u4e0d\u652f\u6301\uff0c\u800c InnoDB \u652f\u6301\u3002<\/p>\n<p>\u8bb2\u771f\uff0c\u8fd9\u4e2a\u5bf9\u6bd4\u6709\u70b9\u5e9f\u8bdd\uff0c\u6bd5\u7adf MyISAM \u8fde\u884c\u7ea7\u9501\u90fd\u4e0d\u652f\u6301\u3002MVCC \u53ef\u4ee5\u770b\u4f5c\u662f\u884c\u7ea7\u9501\u7684\u4e00\u4e2a\u5347\u7ea7\uff0c\u53ef\u4ee5\u6709\u6548\u51cf\u5c11\u52a0\u9501\u64cd\u4f5c\uff0c\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<p><strong>6\u3001\u7d22\u5f15\u5b9e\u73b0\u4e0d\u4e00\u6837\u3002<\/strong><br \/>\n\u867d\u7136 MyISAM \u5f15\u64ce\u548c InnoDB \u5f15\u64ce\u90fd\u662f\u4f7f\u7528 B+Tree \u4f5c\u4e3a\u7d22\u5f15\u7ed3\u6784\uff0c\u4f46\u662f\u4e24\u8005\u7684\u5b9e\u73b0\u65b9\u5f0f\u4e0d\u592a\u4e00\u6837\u3002InnoDB \u5f15\u64ce\u4e2d\uff0c\u5176\u6570\u636e\u6587\u4ef6\u672c\u8eab\u5c31\u662f\u7d22\u5f15\u6587\u4ef6\u3002\u76f8\u6bd4 MyISAM\uff0c\u7d22\u5f15\u6587\u4ef6\u548c\u6570\u636e\u6587\u4ef6\u662f\u5206\u79bb\u7684\uff0c\u5176\u8868\u6570\u636e\u6587\u4ef6\u672c\u8eab\u5c31\u662f\u6309 B+Tree \u7ec4\u7ec7\u7684\u4e00\u4e2a\u7d22\u5f15\u7ed3\u6784\uff0c\u6811\u7684\u53f6\u8282\u70b9 data \u57df\u4fdd\u5b58\u4e86\u5b8c\u6574\u7684\u6570\u636e\u8bb0\u5f55\u3002<\/p>\n<p><strong>7\u3001\u6027\u80fd\u6709\u5dee\u522b\uff1a<\/strong><br \/>\nInnoDB \u7684\u6027\u80fd\u6bd4 MyISAM \u66f4\u5f3a\u5927\uff0c\u4e0d\u7ba1\u662f\u5728\u8bfb\u5199\u6df7\u5408\u6a21\u5f0f\u4e0b\u8fd8\u662f\u53ea\u8bfb\u6a21\u5f0f\u4e0b\uff0c\u968f\u7740 CPU \u6838\u6570\u7684\u589e\u52a0\uff0cInnoDB \u7684\u8bfb\u5199\u80fd\u529b\u5448\u7ebf\u6027\u589e\u957f\u3002MyISAM \u56e0\u4e3a\u8bfb\u5199\u4e0d\u80fd\u5e76\u53d1\uff0c\u5b83\u7684\u5904\u7406\u80fd\u529b\u8ddf\u6838\u6570\u6ca1\u5173\u7cfb\u3002<\/p>\n<p><strong>8\u3001\u6570\u636e\u7f13\u5b58\u7b56\u7565\u548c\u673a\u5236\u5b9e\u73b0\u4e0d\u540c\u3002<\/strong><\/p>\n<p>InnoDB \u4f7f\u7528\u7f13\u51b2\u6c60\uff08Buffer Pool\uff09\u7f13\u5b58\u6570\u636e\u9875\u548c\u7d22\u5f15\u9875\uff0cMyISAM \u4f7f\u7528\u952e\u7f13\u5b58\uff08Key Cache\uff09\u4ec5\u7f13\u5b58\u7d22\u5f15\u9875\u800c\u4e0d\u7f13\u5b58\u6570\u636e\u9875\u3002<\/p>\n<p><strong>\u603b\u7ed3\uff1a<\/strong><\/p>\n<p>InnoDB \u652f\u6301\u884c\u7ea7\u522b\u7684\u9501\u7c92\u5ea6\uff0cMyISAM \u4e0d\u652f\u6301\uff0c\u53ea\u652f\u6301\u8868\u7ea7\u522b\u7684\u9501\u7c92\u5ea6\u3002<br \/>\nMyISAM \u4e0d\u63d0\u4f9b\u4e8b\u52a1\u652f\u6301\u3002InnoDB \u63d0\u4f9b\u4e8b\u52a1\u652f\u6301\uff0c\u5b9e\u73b0\u4e86 SQL \u6807\u51c6\u5b9a\u4e49\u4e86\u56db\u4e2a\u9694\u79bb\u7ea7\u522b\u3002<br \/>\nMyISAM \u4e0d\u652f\u6301\u5916\u952e\uff0c\u800c InnoDB \u652f\u6301\u3002<br \/>\nMyISAM \u4e0d\u652f\u6301 MVCC\uff0c\u800c InnoDB \u652f\u6301\u3002<br \/>\n\u867d\u7136 MyISAM \u5f15\u64ce\u548c InnoDB \u5f15\u64ce\u90fd\u662f\u4f7f\u7528 B+Tree \u4f5c\u4e3a\u7d22\u5f15\u7ed3\u6784\uff0c\u4f46\u662f\u4e24\u8005\u7684\u5b9e\u73b0\u65b9\u5f0f\u4e0d\u592a\u4e00\u6837\u3002<br \/>\nMyISAM \u4e0d\u652f\u6301\u6570\u636e\u5e93\u5f02\u5e38\u5d29\u6e83\u540e\u7684\u5b89\u5168\u6062\u590d\uff0c\u800c InnoDB \u652f\u6301\u3002<br \/>\nInnoDB \u7684\u6027\u80fd\u6bd4 MyISAM \u66f4\u5f3a\u5927\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"MyISAM_%E5%92%8C_InnoDB_%E5%A6%82%E4%BD%95%E9%80%89%E6%8B%A9%EF%BC%9F\"><\/span>MyISAM \u548c InnoDB \u5982\u4f55\u9009\u62e9\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u5927\u591a\u6570\u65f6\u5019\u6211\u4eec\u4f7f\u7528\u7684\u90fd\u662f InnoDB \u5b58\u50a8\u5f15\u64ce\uff0c\u5728\u67d0\u4e9b\u8bfb\u5bc6\u96c6\u7684\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528 MyISAM \u4e5f\u662f\u5408\u9002\u7684\u3002\u4e0d\u8fc7\uff0c\u524d\u63d0\u662f\u4f60\u7684\u9879\u76ee\u4e0d\u4ecb\u610f MyISAM \u4e0d\u652f\u6301\u4e8b\u52a1\u3001\u5d29\u6e83\u6062\u590d\u7b49\u7f3a\u70b9\uff08\u53ef\u662f~\u6211\u4eec\u4e00\u822c\u90fd\u4f1a\u4ecb\u610f\u554a\uff09\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/yingjun.run\/wp-content\/uploads\/2025\/07\/image-1752467691913.png\" alt=\"file\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"MySQL_%E6%9F%A5%E8%AF%A2%E7%BC%93%E5%AD%98\"><\/span>MySQL \u67e5\u8be2\u7f13\u5b58<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>MySQL \u67e5\u8be2\u7f13\u5b58\u662f\u67e5\u8be2\u7ed3\u679c\u7f13\u5b58\u3002\u6267\u884c\u67e5\u8be2\u8bed\u53e5\u7684\u65f6\u5019\uff0c\u4f1a\u5148\u67e5\u8be2\u7f13\u5b58\uff0c\u5982\u679c\u7f13\u5b58\u4e2d\u6709\u5bf9\u5e94\u7684\u67e5\u8be2\u7ed3\u679c\uff0c\u5c31\u4f1a\u76f4\u63a5\u8fd4\u56de\u3002<br \/>\nmy.cnf \u52a0\u5165\u4ee5\u4e0b\u914d\u7f6e\uff0c\u91cd\u542f MySQL \u5f00\u542f\u67e5\u8be2\u7f13\u5b58<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">query_cache_type=1\nquery_cache_size=600000\n\nMySQL \u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\u4e5f\u53ef\u4ee5\u5f00\u542f\u67e5\u8be2\u7f13\u5b58\n\nset global  query_cache_type=1;\nset global  query_cache_size=600000;<\/code><\/pre>\n<p>\u67e5\u8be2\u7f13\u5b58\u4f1a\u5728\u540c\u6837\u7684\u67e5\u8be2\u6761\u4ef6\u548c\u6570\u636e\u60c5\u51b5\u4e0b\uff0c\u76f4\u63a5\u8fd4\u56de\u7f13\u5b58\u4e2d\u7684\u7ed3\u679c\u3002\u4f46\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u67e5\u8be2\u7f13\u5b58\u7684\u5339\u914d\u6761\u4ef6\u975e\u5e38\u4e25\u683c\uff0c\u4efb\u4f55\u7ec6\u5fae\u7684\u5dee\u5f02\u90fd\u4f1a\u5bfc\u81f4\u7f13\u5b58\u65e0\u6cd5\u547d\u4e2d\u3002\u8fd9\u91cc\u7684\u67e5\u8be2\u6761\u4ef6\u5305\u62ec\u67e5\u8be2\u8bed\u53e5\u672c\u8eab\u3001\u5f53\u524d\u4f7f\u7528\u7684\u6570\u636e\u5e93\u3001\u4ee5\u53ca\u5176\u4ed6\u53ef\u80fd\u5f71\u54cd\u7ed3\u679c\u7684\u56e0\u7d20\uff0c\u5982\u5ba2\u6237\u7aef\u534f\u8bae\u7248\u672c\u53f7\u7b49\u3002<\/p>\n<p><strong>\u67e5\u8be2\u7f13\u5b58\u4e0d\u547d\u4e2d\u7684\u60c5\u51b5\uff1a<\/strong><br \/>\n1\u3001\u4efb\u4f55\u4e24\u4e2a\u67e5\u8be2\u5728\u4efb\u4f55\u5b57\u7b26\u4e0a\u7684\u4e0d\u540c\u90fd\u4f1a\u5bfc\u81f4\u7f13\u5b58\u4e0d\u547d\u4e2d\u3002<br \/>\n2\u3001\u5982\u679c\u67e5\u8be2\u4e2d\u5305\u542b\u4efb\u4f55\u7528\u6237\u81ea\u5b9a\u4e49\u51fd\u6570\u3001\u5b58\u50a8\u51fd\u6570\u3001\u7528\u6237\u53d8\u91cf\u3001\u4e34\u65f6\u8868\u3001MySQL \u5e93\u4e2d\u7684\u7cfb\u7edf\u8868\uff0c\u5176\u67e5\u8be2\u7ed3\u679c\u4e5f\u4e0d\u4f1a\u88ab\u7f13\u5b58\u3002<br \/>\n3\u3001\u7f13\u5b58\u5efa\u7acb\u4e4b\u540e\uff0cMySQL \u7684\u67e5\u8be2\u7f13\u5b58\u7cfb\u7edf\u4f1a\u8ddf\u8e2a\u67e5\u8be2\u4e2d\u6d89\u53ca\u7684\u6bcf\u5f20\u8868\uff0c\u5982\u679c\u8fd9\u4e9b\u8868\uff08\u6570\u636e\u6216\u7ed3\u6784\uff09\u53d1\u751f\u53d8\u5316\uff0c\u90a3\u4e48\u548c\u8fd9\u5f20\u8868\u76f8\u5173\u7684\u6240\u6709\u7f13\u5b58\u6570\u636e\u90fd\u5c06\u5931\u6548\u3002<\/p>\n<p><strong>\u7f13\u5b58\u867d\u7136\u80fd\u591f\u63d0\u5347\u6570\u636e\u5e93\u7684\u67e5\u8be2\u6027\u80fd\uff0c\u4f46\u662f\u7f13\u5b58\u540c\u65f6\u4e5f\u5e26\u6765\u4e86\u989d\u5916\u7684\u5f00\u9500\uff0c\u6bcf\u6b21\u67e5\u8be2\u540e\u90fd\u8981\u505a\u4e00\u6b21\u7f13\u5b58\u64cd\u4f5c\uff0c\u5931\u6548\u540e\u8fd8\u8981\u9500\u6bc1\u3002<\/strong> \u56e0\u6b64\uff0c\u5f00\u542f\u67e5\u8be2\u7f13\u5b58\u8981\u8c28\u614e\uff0c\u5c24\u5176\u5bf9\u4e8e\u5199\u5bc6\u96c6\u7684\u5e94\u7528\u6765\u8bf4\u66f4\u662f\u5982\u6b64\u3002\u5982\u679c\u5f00\u542f\uff0c\u8981\u6ce8\u610f\u5408\u7406\u63a7\u5236\u7f13\u5b58\u7a7a\u95f4\u5927\u5c0f\uff0c\u4e00\u822c\u6765\u8bf4\u5176\u5927\u5c0f\u8bbe\u7f6e\u4e3a\u51e0\u5341 MB \u6bd4\u8f83\u5408\u9002\u3002\u6b64\u5916\uff0c\u8fd8\u53ef\u4ee5\u901a\u8fc7 sql_cache \u548c sql_no_cache \u6765\u63a7\u5236\u67d0\u4e2a\u67e5\u8be2\u8bed\u53e5\u662f\u5426\u9700\u8981\u7f13\u5b58\uff1a<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">SELECT sql_no_cache COUNT(*) FROM usr;<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"MySQL_%E4%BA%8B%E5%8A%A1\"><\/span>MySQL \u4e8b\u52a1<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>\u4f55\u8c13\u4e8b\u52a1\uff1f<\/strong><br \/>\n\u4e8b\u52a1\u662f\u903b\u8f91\u4e0a\u7684\u4e00\u7ec4\u64cd\u4f5c\uff0c\u8981\u4e48\u90fd\u6267\u884c\uff0c\u8981\u4e48\u90fd\u4e0d\u6267\u884c\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/yingjun.run\/wp-content\/uploads\/2025\/07\/image-1752468006723.png\" alt=\"file\" \/><\/p>\n<p><strong>\u539f\u5b50\u6027\uff08Atomicity\uff09<\/strong>\uff1a\u4e8b\u52a1\u662f\u6700\u5c0f\u7684\u6267\u884c\u5355\u4f4d\uff0c\u4e0d\u5141\u8bb8\u5206\u5272\u3002\u4e8b\u52a1\u7684\u539f\u5b50\u6027\u786e\u4fdd\u52a8\u4f5c\u8981\u4e48\u5168\u90e8\u5b8c\u6210\uff0c\u8981\u4e48\u5b8c\u5168\u4e0d\u8d77\u4f5c\u7528\uff1b<\/p>\n<p><strong>\u4e00\u81f4\u6027\uff08Consistency\uff09<\/strong>\uff1a\u6267\u884c\u4e8b\u52a1\u524d\u540e\uff0c\u6570\u636e\u4fdd\u6301\u4e00\u81f4\uff0c\u4f8b\u5982\u8f6c\u8d26\u4e1a\u52a1\u4e2d\uff0c\u65e0\u8bba\u4e8b\u52a1\u662f\u5426\u6210\u529f\uff0c\u8f6c\u8d26\u8005\u548c\u6536\u6b3e\u4eba\u7684\u603b\u989d\u5e94\u8be5\u662f\u4e0d\u53d8\u7684\uff1b<\/p>\n<p><strong>\u9694\u79bb\u6027\uff08Isolation\uff09<\/strong>\uff1a\u5e76\u53d1\u8bbf\u95ee\u6570\u636e\u5e93\u65f6\uff0c\u4e00\u4e2a\u7528\u6237\u7684\u4e8b\u52a1\u4e0d\u88ab\u5176\u4ed6\u4e8b\u52a1\u6240\u5e72\u6270\uff0c\u5404\u5e76\u53d1\u4e8b\u52a1\u4e4b\u95f4\u6570\u636e\u5e93\u662f\u72ec\u7acb\u7684\uff1b<\/p>\n<p><strong>\u6301\u4e45\u6027\uff08Durability\uff09<\/strong>\uff1a\u4e00\u4e2a\u4e8b\u52a1\u88ab\u63d0\u4ea4\u4e4b\u540e\u3002\u5b83\u5bf9\u6570\u636e\u5e93\u4e2d\u6570\u636e\u7684\u6539\u53d8\u662f\u6301\u4e45\u7684\uff0c\u5373\u4f7f\u6570\u636e\u5e93\u53d1\u751f\u6545\u969c\u4e5f\u4e0d\u5e94\u8be5\u5bf9\u5176\u6709\u4efb\u4f55\u5f71\u54cd\u3002<\/p>\n<p><strong>\u53ea\u6709\u4fdd\u8bc1\u4e86\u4e8b\u52a1\u7684\u6301\u4e45\u6027\u3001\u539f\u5b50\u6027\u3001\u9694\u79bb\u6027\u4e4b\u540e\uff0c\u4e00\u81f4\u6027\u624d\u80fd\u5f97\u5230\u4fdd\u969c\u3002\u4e5f\u5c31\u662f\u8bf4 A\u3001I\u3001D \u662f\u624b\u6bb5\uff0cC \u662f\u76ee\u7684\uff01<\/strong><br \/>\n<img decoding=\"async\" src=\"https:\/\/yingjun.run\/wp-content\/uploads\/2025\/07\/image-1752468054769.png\" alt=\"file\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E5%B9%B6%E5%8F%91%E4%BA%8B%E5%8A%A1%E5%B8%A6%E6%9D%A5%E4%BA%86%E5%93%AA%E4%BA%9B%E9%97%AE%E9%A2%98\"><\/span>\u5e76\u53d1\u4e8b\u52a1\u5e26\u6765\u4e86\u54ea\u4e9b\u95ee\u9898?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h4><span class=\"ez-toc-section\" id=\"%E8%84%8F%E8%AF%BB%EF%BC%88Dirty_read%EF%BC%89\"><\/span>\u810f\u8bfb\uff08Dirty read\uff09<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>\u4e00\u4e2a\u4e8b\u52a1\u8bfb\u53d6\u6570\u636e\u5e76\u4e14\u5bf9\u6570\u636e\u8fdb\u884c\u4e86\u4fee\u6539\uff0c\u8fd9\u4e2a\u4fee\u6539\u5bf9\u5176\u4ed6\u4e8b\u52a1\u6765\u8bf4\u662f\u53ef\u89c1\u7684\uff0c\u5373\u4f7f\u5f53\u524d\u4e8b\u52a1\u6ca1\u6709\u63d0\u4ea4\u3002\u8fd9\u65f6\u53e6\u5916\u4e00\u4e2a\u4e8b\u52a1\u8bfb\u53d6\u4e86\u8fd9\u4e2a\u8fd8\u672a\u63d0\u4ea4\u7684\u6570\u636e\uff0c\u4f46\u7b2c\u4e00\u4e2a\u4e8b\u52a1\u7a81\u7136\u56de\u6eda\uff0c\u5bfc\u81f4\u6570\u636e\u5e76\u6ca1\u6709\u88ab\u63d0\u4ea4\u5230\u6570\u636e\u5e93\uff0c\u90a3\u7b2c\u4e8c\u4e2a\u4e8b\u52a1\u8bfb\u53d6\u5230\u7684\u5c31\u662f\u810f\u6570\u636e\uff0c\u8fd9\u4e5f\u5c31\u662f\u810f\u8bfb\u7684\u7531\u6765\u3002<\/p>\n<p>\u4f8b\u5982\uff1a\u4e8b\u52a1 1 \u8bfb\u53d6\u67d0\u8868\u4e2d\u7684\u6570\u636e A=20\uff0c\u4e8b\u52a1 1 \u4fee\u6539 A=A-1\uff0c\u4e8b\u52a1 2 \u8bfb\u53d6\u5230 A = 19,\u4e8b\u52a1 1 \u56de\u6eda\u5bfc\u81f4\u5bf9 A \u7684\u4fee\u6539\u5e76\u672a\u63d0\u4ea4\u5230\u6570\u636e\u5e93\uff0c A \u7684\u503c\u8fd8\u662f 20\u3002<\/p>\n<h4><span class=\"ez-toc-section\" id=\"%E4%B8%A2%E5%A4%B1%E4%BF%AE%E6%94%B9%EF%BC%88Lost_to_modify%EF%BC%89\"><\/span>\u4e22\u5931\u4fee\u6539\uff08Lost to modify\uff09<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>\u5728\u4e00\u4e2a\u4e8b\u52a1\u8bfb\u53d6\u4e00\u4e2a\u6570\u636e\u65f6\uff0c\u53e6\u5916\u4e00\u4e2a\u4e8b\u52a1\u4e5f\u8bbf\u95ee\u4e86\u8be5\u6570\u636e\uff0c\u90a3\u4e48\u5728\u7b2c\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u4fee\u6539\u4e86\u8fd9\u4e2a\u6570\u636e\u540e\uff0c\u7b2c\u4e8c\u4e2a\u4e8b\u52a1\u4e5f\u4fee\u6539\u4e86\u8fd9\u4e2a\u6570\u636e\u3002\u8fd9\u6837\u7b2c\u4e00\u4e2a\u4e8b\u52a1\u5185\u7684\u4fee\u6539\u7ed3\u679c\u5c31\u88ab\u4e22\u5931\uff0c\u56e0\u6b64\u79f0\u4e3a\u4e22\u5931\u4fee\u6539\u3002<\/p>\n<p>\u4f8b\u5982\uff1a\u4e8b\u52a1 1 \u8bfb\u53d6\u67d0\u8868\u4e2d\u7684\u6570\u636e A=20\uff0c\u4e8b\u52a1 2 \u4e5f\u8bfb\u53d6 A=20\uff0c\u4e8b\u52a1 1 \u5148\u4fee\u6539 A=A-1\uff0c\u4e8b\u52a1 2 \u540e\u6765\u4e5f\u4fee\u6539 A=A-1\uff0c\u6700\u7ec8\u7ed3\u679c A=19\uff0c\u4e8b\u52a1 1 \u7684\u4fee\u6539\u88ab\u4e22\u5931\u3002<\/p>\n<h4><span class=\"ez-toc-section\" id=\"%E4%B8%8D%E5%8F%AF%E9%87%8D%E5%A4%8D%E8%AF%BB%EF%BC%88Unrepeatable_read%EF%BC%89\"><\/span>\u4e0d\u53ef\u91cd\u590d\u8bfb\uff08Unrepeatable read\uff09<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>\u6307\u5728\u4e00\u4e2a\u4e8b\u52a1\u5185\u591a\u6b21\u8bfb\u540c\u4e00\u6570\u636e\u3002\u5728\u8fd9\u4e2a\u4e8b\u52a1\u8fd8\u6ca1\u6709\u7ed3\u675f\u65f6\uff0c\u53e6\u4e00\u4e2a\u4e8b\u52a1\u4e5f\u8bbf\u95ee\u8be5\u6570\u636e\u3002\u90a3\u4e48\uff0c\u5728\u7b2c\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u7684\u4e24\u6b21\u8bfb\u6570\u636e\u4e4b\u95f4\uff0c\u7531\u4e8e\u7b2c\u4e8c\u4e2a\u4e8b\u52a1\u7684\u4fee\u6539\u5bfc\u81f4\u7b2c\u4e00\u4e2a\u4e8b\u52a1\u4e24\u6b21\u8bfb\u53d6\u7684\u6570\u636e\u53ef\u80fd\u4e0d\u592a\u4e00\u6837\u3002\u8fd9\u5c31\u53d1\u751f\u4e86\u5728\u4e00\u4e2a\u4e8b\u52a1\u5185\u4e24\u6b21\u8bfb\u5230\u7684\u6570\u636e\u662f\u4e0d\u4e00\u6837\u7684\u60c5\u51b5\uff0c\u56e0\u6b64\u79f0\u4e3a\u4e0d\u53ef\u91cd\u590d\u8bfb\u3002<\/p>\n<p>\u4f8b\u5982\uff1a\u4e8b\u52a1 1 \u8bfb\u53d6\u67d0\u8868\u4e2d\u7684\u6570\u636e A=20\uff0c\u4e8b\u52a1 2 \u4e5f\u8bfb\u53d6 A=20\uff0c\u4e8b\u52a1 1 \u4fee\u6539 A=A-1\uff0c\u4e8b\u52a1 2 \u518d\u6b21\u8bfb\u53d6 A =19\uff0c\u6b64\u65f6\u8bfb\u53d6\u7684\u7ed3\u679c\u548c\u7b2c\u4e00\u6b21\u8bfb\u53d6\u7684\u7ed3\u679c\u4e0d\u540c\u3002<\/p>\n<h4><span class=\"ez-toc-section\" id=\"%E5%B9%BB%E8%AF%BB%EF%BC%88Phantom_read%EF%BC%89\"><\/span>\u5e7b\u8bfb\uff08Phantom read\uff09<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>\u5e7b\u8bfb\u4e0e\u4e0d\u53ef\u91cd\u590d\u8bfb\u7c7b\u4f3c\u3002\u5b83\u53d1\u751f\u5728\u4e00\u4e2a\u4e8b\u52a1\u8bfb\u53d6\u4e86\u51e0\u884c\u6570\u636e\uff0c\u63a5\u7740\u53e6\u4e00\u4e2a\u5e76\u53d1\u4e8b\u52a1\u63d2\u5165\u4e86\u4e00\u4e9b\u6570\u636e\u65f6\u3002\u5728\u968f\u540e\u7684\u67e5\u8be2\u4e2d\uff0c\u7b2c\u4e00\u4e2a\u4e8b\u52a1\u5c31\u4f1a\u53d1\u73b0\u591a\u4e86\u4e00\u4e9b\u539f\u672c\u4e0d\u5b58\u5728\u7684\u8bb0\u5f55\uff0c\u5c31\u597d\u50cf\u53d1\u751f\u4e86\u5e7b\u89c9\u4e00\u6837\uff0c\u6240\u4ee5\u79f0\u4e3a\u5e7b\u8bfb\u3002<\/p>\n<p>\u4f8b\u5982\uff1a\u4e8b\u52a1 2 \u8bfb\u53d6\u67d0\u4e2a\u8303\u56f4\u7684\u6570\u636e\uff0c\u4e8b\u52a1 1 \u5728\u8fd9\u4e2a\u8303\u56f4\u63d2\u5165\u4e86\u65b0\u7684\u6570\u636e\uff0c\u4e8b\u52a1 2 \u518d\u6b21\u8bfb\u53d6\u8fd9\u4e2a\u8303\u56f4\u7684\u6570\u636e\u53d1\u73b0\u76f8\u6bd4\u4e8e\u7b2c\u4e00\u6b21\u8bfb\u53d6\u7684\u7ed3\u679c\u591a\u4e86\u65b0\u7684\u6570\u636e\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E4%B8%8D%E5%8F%AF%E9%87%8D%E5%A4%8D%E8%AF%BB%E5%92%8C%E5%B9%BB%E8%AF%BB%E6%9C%89%E4%BB%80%E4%B9%88%E5%8C%BA%E5%88%AB%EF%BC%9F\"><\/span>\u4e0d\u53ef\u91cd\u590d\u8bfb\u548c\u5e7b\u8bfb\u6709\u4ec0\u4e48\u533a\u522b\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u4e0d\u53ef\u91cd\u590d\u8bfb\u7684\u91cd\u70b9\u662f\u5185\u5bb9\u4fee\u6539\u6216\u8005\u8bb0\u5f55\u51cf\u5c11\u6bd4\u5982\u591a\u6b21\u8bfb\u53d6\u4e00\u6761\u8bb0\u5f55\u53d1\u73b0\u5176\u4e2d\u67d0\u4e9b\u8bb0\u5f55\u7684\u503c\u88ab\u4fee\u6539\uff1b<br \/>\n\u5e7b\u8bfb\u7684\u91cd\u70b9\u5728\u4e8e\u8bb0\u5f55\u65b0\u589e\u6bd4\u5982\u591a\u6b21\u6267\u884c\u540c\u4e00\u6761\u67e5\u8be2\u8bed\u53e5\uff08DQL\uff09\u65f6\uff0c\u53d1\u73b0\u67e5\u5230\u7684\u8bb0\u5f55\u589e\u52a0\u4e86\u3002<\/p>\n<p>\u5e7b\u8bfb\u5176\u5b9e\u53ef\u4ee5\u770b\u4f5c\u662f\u4e0d\u53ef\u91cd\u590d\u8bfb\u7684\u4e00\u79cd\u7279\u6b8a\u60c5\u51b5\uff0c\u5355\u72ec\u628a\u5e7b\u8bfb\u533a\u5206\u51fa\u6765\u7684\u539f\u56e0\u4e3b\u8981\u662f\u89e3\u51b3\u5e7b\u8bfb\u548c\u4e0d\u53ef\u91cd\u590d\u8bfb\u7684\u65b9\u6848\u4e0d\u4e00\u6837\u3002<\/p>\n<p>\u4e3e\u4e2a\u4f8b\u5b50\uff1a\u6267\u884c delete \u548c update \u64cd\u4f5c\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u76f4\u63a5\u5bf9\u8bb0\u5f55\u52a0\u9501\uff0c\u4fdd\u8bc1\u4e8b\u52a1\u5b89\u5168\u3002\u800c\u6267\u884c insert \u64cd\u4f5c\u7684\u65f6\u5019\uff0c\u7531\u4e8e\u8bb0\u5f55\u9501\uff08Record Lock\uff09\u53ea\u80fd\u9501\u4f4f\u5df2\u7ecf\u5b58\u5728\u7684\u8bb0\u5f55\uff0c\u4e3a\u4e86\u907f\u514d\u63d2\u5165\u65b0\u8bb0\u5f55\uff0c\u9700\u8981\u4f9d\u8d56\u95f4\u9699\u9501\uff08Gap Lock\uff09\u3002\u4e5f\u5c31\u662f\u8bf4\u6267\u884c insert \u64cd\u4f5c\u7684\u65f6\u5019\u9700\u8981\u4f9d\u8d56 Next-Key Lock\uff08Record Lock+Gap Lock\uff09 \u8fdb\u884c\u52a0\u9501\u6765\u4fdd\u8bc1\u4e0d\u51fa\u73b0\u5e7b\u8bfb<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E5%B9%B6%E5%8F%91%E4%BA%8B%E5%8A%A1%E7%9A%84%E6%8E%A7%E5%88%B6%E6%96%B9%E5%BC%8F%E6%9C%89%E5%93%AA%E4%BA%9B%EF%BC%9F\"><\/span>\u5e76\u53d1\u4e8b\u52a1\u7684\u63a7\u5236\u65b9\u5f0f\u6709\u54ea\u4e9b\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>MySQL \u4e2d\u5e76\u53d1\u4e8b\u52a1\u7684\u63a7\u5236\u65b9\u5f0f\u65e0\u975e\u5c31\u4e24\u79cd\uff1a<strong>\u9501<\/strong> \u548c<strong> MVCC<\/strong>\u3002\u9501\u53ef\u4ee5\u770b\u4f5c\u662f\u60b2\u89c2\u63a7\u5236\u7684\u6a21\u5f0f\uff0c\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236\uff08MVCC\uff0cMultiversion concurrency control\uff09\u53ef\u4ee5\u770b\u4f5c\u662f\u4e50\u89c2\u63a7\u5236\u7684\u6a21\u5f0f\u3002<\/p>\n<p><strong>\u9501<\/strong> \u63a7\u5236\u65b9\u5f0f\u4e0b\u4f1a\u901a\u8fc7\u9501\u6765\u663e\u5f0f\u63a7\u5236\u5171\u4eab\u8d44\u6e90\u800c\u4e0d\u662f\u901a\u8fc7\u8c03\u5ea6\u624b\u6bb5\uff0cMySQL \u4e2d\u4e3b\u8981\u662f\u901a\u8fc7 \u8bfb\u5199\u9501 \u6765\u5b9e\u73b0\u5e76\u53d1\u63a7\u5236\u3002<br \/>\n<strong>\u5171\u4eab\u9501\uff08S \u9501\uff09<\/strong>\uff1a\u53c8\u79f0\u8bfb\u9501\uff0c\u4e8b\u52a1\u5728\u8bfb\u53d6\u8bb0\u5f55\u7684\u65f6\u5019\u83b7\u53d6\u5171\u4eab\u9501\uff0c\u5141\u8bb8\u591a\u4e2a\u4e8b\u52a1\u540c\u65f6\u83b7\u53d6\uff08\u9501\u517c\u5bb9\uff09\u3002<br \/>\n<strong>\u6392\u4ed6\u9501\uff08X \u9501\uff09<\/strong>\uff1a\u53c8\u79f0\u5199\u9501\/\u72ec\u5360\u9501\uff0c\u4e8b\u52a1\u5728\u4fee\u6539\u8bb0\u5f55\u7684\u65f6\u5019\u83b7\u53d6\u6392\u4ed6\u9501\uff0c\u4e0d\u5141\u8bb8\u591a\u4e2a\u4e8b\u52a1\u540c\u65f6\u83b7\u53d6\u3002\u5982\u679c\u4e00\u4e2a\u8bb0\u5f55\u5df2\u7ecf\u88ab\u52a0\u4e86\u6392\u4ed6\u9501\uff0c\u90a3\u5176\u4ed6\u4e8b\u52a1\u4e0d\u80fd\u518d\u5bf9\u8fd9\u6761\u8bb0\u5f55\u52a0\u4efb\u4f55\u7c7b\u578b\u7684\u9501\uff08\u9501\u4e0d\u517c\u5bb9\uff09\u3002<\/p>\n<p>\u8bfb\u5199\u9501\u53ef\u4ee5\u505a\u5230\u8bfb\u8bfb\u5e76\u884c\uff0c\u4f46\u662f\u65e0\u6cd5\u505a\u5230\u5199\u8bfb\u3001\u5199\u5199\u5e76\u884c\u3002\u53e6\u5916\uff0c\u6839\u636e\u6839\u636e\u9501\u7c92\u5ea6\u7684\u4e0d\u540c\uff0c\u53c8\u88ab\u5206\u4e3a <strong>\u8868\u7ea7\u9501(table-level locking)<\/strong> \u548c <strong>\u884c\u7ea7\u9501(row-level locking)<\/strong> \u3002InnoDB \u4e0d\u5149\u652f\u6301\u8868\u7ea7\u9501\uff0c\u8fd8\u652f\u6301\u884c\u7ea7\u9501\uff0c\u9ed8\u8ba4\u4e3a\u884c\u7ea7\u9501\u3002\u884c\u7ea7\u9501\u7684\u7c92\u5ea6\u66f4\u5c0f\uff0c\u4ec5\u5bf9\u76f8\u5173\u7684\u8bb0\u5f55\u4e0a\u9501\u5373\u53ef\uff08\u5bf9\u4e00\u884c\u6216\u8005\u591a\u884c\u8bb0\u5f55\u52a0\u9501\uff09\uff0c\u6240\u4ee5\u5bf9\u4e8e\u5e76\u53d1\u5199\u5165\u64cd\u4f5c\u6765\u8bf4\uff0c InnoDB \u7684\u6027\u80fd\u66f4\u9ad8\u3002\u4e0d\u8bba\u662f\u8868\u7ea7\u9501\u8fd8\u662f\u884c\u7ea7\u9501\uff0c\u90fd\u5b58\u5728\u5171\u4eab\u9501\uff08Share Lock\uff0cS \u9501\uff09\u548c\u6392\u4ed6\u9501\uff08Exclusive Lock\uff0cX \u9501\uff09\u8fd9\u4e24\u7c7b\u3002<\/p>\n<p><strong>MVCC<\/strong> \u662f\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236\u65b9\u6cd5\uff0c\u5373\u5bf9\u4e00\u4efd\u6570\u636e\u4f1a\u5b58\u50a8\u591a\u4e2a\u7248\u672c\uff0c\u901a\u8fc7\u4e8b\u52a1\u7684\u53ef\u89c1\u6027\u6765\u4fdd\u8bc1\u4e8b\u52a1\u80fd\u770b\u5230\u81ea\u5df1\u5e94\u8be5\u770b\u5230\u7684\u7248\u672c\u3002\u901a\u5e38\u4f1a\u6709\u4e00\u4e2a\u5168\u5c40\u7684\u7248\u672c\u5206\u914d\u5668\u6765\u4e3a\u6bcf\u4e00\u884c\u6570\u636e\u8bbe\u7f6e\u7248\u672c\u53f7\uff0c\u7248\u672c\u53f7\u662f\u552f\u4e00\u7684\u3002<\/p>\n<p><strong>MVCC<\/strong> \u5728 MySQL \u4e2d\u5b9e\u73b0\u6240\u4f9d\u8d56\u7684\u624b\u6bb5\u4e3b\u8981\u662f: <strong>\u9690\u85cf\u5b57\u6bb5\u3001read view\u3001undo log\u3002<\/strong><br \/>\n<strong>undo log <\/strong>: undo log \u7528\u4e8e\u8bb0\u5f55\u67d0\u884c\u6570\u636e\u7684\u591a\u4e2a\u7248\u672c\u7684\u6570\u636e\u3002<br \/>\n<strong>read view \u548c \u9690\u85cf\u5b57\u6bb5 <\/strong>: \u7528\u6765\u5224\u65ad\u5f53\u524d\u7248\u672c\u6570\u636e\u7684\u53ef\u89c1\u6027\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"SQL_%E6%A0%87%E5%87%86%E5%AE%9A%E4%B9%89%E4%BA%86%E5%93%AA%E4%BA%9B%E4%BA%8B%E5%8A%A1%E9%9A%94%E7%A6%BB%E7%BA%A7%E5%88%AB\"><\/span>SQL \u6807\u51c6\u5b9a\u4e49\u4e86\u54ea\u4e9b\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>SQL \u6807\u51c6\u5b9a\u4e49\u4e86\u56db\u79cd\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\uff0c\u7528\u6765\u5e73\u8861\u4e8b\u52a1\u7684\u9694\u79bb\u6027\uff08Isolation\uff09\u548c\u5e76\u53d1\u6027\u80fd\u3002\u7ea7\u522b\u8d8a\u9ad8\uff0c\u6570\u636e\u4e00\u81f4\u6027\u8d8a\u597d\uff0c\u4f46\u5e76\u53d1\u6027\u80fd\u53ef\u80fd\u8d8a\u4f4e\u3002\u8fd9\u56db\u4e2a\u7ea7\u522b\u662f\uff1a<\/p>\n<p><strong>READ-UNCOMMITTED(\u8bfb\u53d6\u672a\u63d0\u4ea4)<\/strong> \uff1a\u6700\u4f4e\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u5141\u8bb8\u8bfb\u53d6\u5c1a\u672a\u63d0\u4ea4\u7684\u6570\u636e\u53d8\u66f4\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u810f\u8bfb\u3001\u5e7b\u8bfb\u6216\u4e0d\u53ef\u91cd\u590d\u8bfb\u3002\u8fd9\u79cd\u7ea7\u522b\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u5f88\u5c11\u4f7f\u7528\uff0c\u56e0\u4e3a\u5b83\u5bf9\u6570\u636e\u4e00\u81f4\u6027\u7684\u4fdd\u8bc1\u592a\u5f31\u3002<\/p>\n<p><strong>READ-COMMITTED(\u8bfb\u53d6\u5df2\u63d0\u4ea4)<\/strong> \uff1a\u5141\u8bb8\u8bfb\u53d6\u5e76\u53d1\u4e8b\u52a1\u5df2\u7ecf\u63d0\u4ea4\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u963b\u6b62\u810f\u8bfb\uff0c\u4f46\u662f\u5e7b\u8bfb\u6216\u4e0d\u53ef\u91cd\u590d\u8bfb\u4ecd\u6709\u53ef\u80fd\u53d1\u751f\u3002\u8fd9\u662f\u5927\u591a\u6570\u6570\u636e\u5e93\uff08\u5982 Oracle, SQL Server\uff09\u7684\u9ed8\u8ba4\u9694\u79bb\u7ea7\u522b\u3002<\/p>\n<p><strong>REPEATABLE-READ(\u53ef\u91cd\u590d\u8bfb)<\/strong> \uff1a\u5bf9\u540c\u4e00\u5b57\u6bb5\u7684\u591a\u6b21\u8bfb\u53d6\u7ed3\u679c\u90fd\u662f\u4e00\u81f4\u7684\uff0c\u9664\u975e\u6570\u636e\u662f\u88ab\u672c\u8eab\u4e8b\u52a1\u81ea\u5df1\u6240\u4fee\u6539\uff0c\u53ef\u4ee5\u963b\u6b62\u810f\u8bfb\u548c\u4e0d\u53ef\u91cd\u590d\u8bfb\uff0c\u4f46\u5e7b\u8bfb\u4ecd\u6709\u53ef\u80fd\u53d1\u751f\u3002MySQL InnoDB \u5b58\u50a8\u5f15\u64ce\u7684\u9ed8\u8ba4\u9694\u79bb\u7ea7\u522b\u6b63\u662f REPEATABLE READ\u3002\u5e76\u4e14\uff0cInnoDB \u5728\u6b64\u7ea7\u522b\u4e0b\u901a\u8fc7 MVCC\uff08\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236\uff09 \u548c Next-Key Locks\uff08\u95f4\u9699\u9501+\u884c\u9501\uff09 \u673a\u5236\uff0c\u5728\u5f88\u5927\u7a0b\u5ea6\u4e0a\u89e3\u51b3\u4e86\u5e7b\u8bfb\u95ee\u9898\u3002<\/p>\n<p><strong>SERIALIZABLE(\u53ef\u4e32\u884c\u5316) <\/strong>\uff1a\u6700\u9ad8\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u5b8c\u5168\u670d\u4ece ACID \u7684\u9694\u79bb\u7ea7\u522b\u3002\u6240\u6709\u7684\u4e8b\u52a1\u4f9d\u6b21\u9010\u4e2a\u6267\u884c\uff0c\u8fd9\u6837\u4e8b\u52a1\u4e4b\u95f4\u5c31\u5b8c\u5168\u4e0d\u53ef\u80fd\u4ea7\u751f\u5e72\u6270\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u8be5\u7ea7\u522b\u53ef\u4ee5\u9632\u6b62\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u4ee5\u53ca\u5e7b\u8bfb\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/yingjun.run\/wp-content\/uploads\/2025\/07\/image-1752469033500.png\" alt=\"file\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"MySQL_%E7%9A%84%E9%BB%98%E8%AE%A4%E9%9A%94%E7%A6%BB%E7%BA%A7%E5%88%AB%E6%98%AF%E4%BB%80%E4%B9%88\"><\/span>MySQL \u7684\u9ed8\u8ba4\u9694\u79bb\u7ea7\u522b\u662f\u4ec0\u4e48?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>MySQL InnoDB \u5b58\u50a8\u5f15\u64ce\u7684\u9ed8\u8ba4\u9694\u79bb\u7ea7\u522b\u662f REPEATABLE READ(\u53ef\u91cd\u590d\u8bfb)<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/yingjun.run\/wp-content\/uploads\/2025\/07\/image-1752469078183.png\" alt=\"file\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"MySQL_%E7%9A%84%E9%9A%94%E7%A6%BB%E7%BA%A7%E5%88%AB%E6%98%AF%E5%9F%BA%E4%BA%8E%E9%94%81%E5%AE%9E%E7%8E%B0%E7%9A%84%E5%90%97%EF%BC%9F\"><\/span>MySQL \u7684\u9694\u79bb\u7ea7\u522b\u662f\u57fa\u4e8e\u9501\u5b9e\u73b0\u7684\u5417\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>MySQL \u7684\u9694\u79bb\u7ea7\u522b\u57fa\u4e8e\u9501\u548c MVCC \u673a\u5236\u5171\u540c\u5b9e\u73b0\u7684\u3002<\/p>\n<p>SERIALIZABLE(\u53ef\u4e32\u884c\u5316) \u9694\u79bb\u7ea7\u522b\u662f\u901a\u8fc7\u9501\u6765\u5b9e\u73b0\u7684\uff0cREAD-COMMITTED(\u8bfb\u53d6\u5df2\u63d0\u4ea4) \u548c REPEATABLE-READ(\u53ef\u91cd\u590d\u8bfb) \u9694\u79bb\u7ea7\u522b\u662f\u57fa\u4e8e MVCC \u5b9e\u73b0\u7684\u3002\u4e0d\u8fc7\uff0c SERIALIZABLE(\u53ef\u4e32\u884c\u5316) \u4e4b\u5916\u7684\u5176\u4ed6\u9694\u79bb\u7ea7\u522b\u53ef\u80fd\u4e5f\u9700\u8981\u7528\u5230\u9501\u673a\u5236\uff0c\u5c31\u6bd4\u5982 REPEATABLE-READ(\u53ef\u91cd\u590d\u8bfb) \u5728\u5f53\u524d\u8bfb\u60c5\u51b5\u4e0b\u9700\u8981\u4f7f\u7528\u52a0\u9501\u8bfb\u6765\u4fdd\u8bc1\u4e0d\u4f1a\u51fa\u73b0\u5e7b\u8bfb\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E8%A1%A8%E7%BA%A7%E9%94%81%E5%92%8C%E8%A1%8C%E7%BA%A7%E9%94%81%E4%BA%86%E8%A7%A3%E5%90%97%EF%BC%9F%E6%9C%89%E4%BB%80%E4%B9%88%E5%8C%BA%E5%88%AB%EF%BC%9F\"><\/span>\u8868\u7ea7\u9501\u548c\u884c\u7ea7\u9501\u4e86\u89e3\u5417\uff1f\u6709\u4ec0\u4e48\u533a\u522b\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>MyISAM \u4ec5\u4ec5\u652f\u6301\u8868\u7ea7\u9501(table-level locking)\uff0c\u4e00\u9501\u5c31\u9501\u6574\u5f20\u8868\uff0c\u8fd9\u5728\u5e76\u53d1\u5199\u7684\u60c5\u51b5\u4e0b\u6027\u975e\u5e38\u5dee\u3002InnoDB \u4e0d\u5149\u652f\u6301\u8868\u7ea7\u9501(table-level locking)\uff0c\u8fd8\u652f\u6301\u884c\u7ea7\u9501(row-level locking)\uff0c\u9ed8\u8ba4\u4e3a\u884c\u7ea7\u9501\u3002<\/p>\n<h4><span class=\"ez-toc-section\" id=\"%E8%A1%A8%E7%BA%A7%E9%94%81%E5%92%8C%E8%A1%8C%E7%BA%A7%E9%94%81%E5%AF%B9%E6%AF%94%EF%BC%9A\"><\/span>\u8868\u7ea7\u9501\u548c\u884c\u7ea7\u9501\u5bf9\u6bd4\uff1a<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p><strong>\u8868\u7ea7\u9501\uff1a<\/strong> MySQL \u4e2d\u9501\u5b9a\u7c92\u5ea6\u6700\u5927\u7684\u4e00\u79cd\u9501\uff08\u5168\u5c40\u9501\u9664\u5916\uff09\uff0c\u662f\u9488\u5bf9\u975e\u7d22\u5f15\u5b57\u6bb5\u52a0\u7684\u9501\uff0c\u5bf9\u5f53\u524d\u64cd\u4f5c\u7684\u6574\u5f20\u8868\u52a0\u9501\uff0c\u5b9e\u73b0\u7b80\u5355\uff0c\u8d44\u6e90\u6d88\u8017\u4e5f\u6bd4\u8f83\u5c11\uff0c\u52a0\u9501\u5feb\uff0c\u4e0d\u4f1a\u51fa\u73b0\u6b7b\u9501\u3002\u4e0d\u8fc7\uff0c\u89e6\u53d1\u9501\u51b2\u7a81\u7684\u6982\u7387\u6700\u9ad8\uff0c\u9ad8\u5e76\u53d1\u4e0b\u6548\u7387\u6781\u4f4e\u3002\u8868\u7ea7\u9501\u548c\u5b58\u50a8\u5f15\u64ce\u65e0\u5173\uff0cMyISAM \u548c InnoDB \u5f15\u64ce\u90fd\u652f\u6301\u8868\u7ea7\u9501\u3002<\/p>\n<p><strong>\u884c\u7ea7\u9501\uff1a<\/strong> MySQL \u4e2d\u9501\u5b9a\u7c92\u5ea6\u6700\u5c0f\u7684\u4e00\u79cd\u9501\uff0c\u662f \u9488\u5bf9\u7d22\u5f15\u5b57\u6bb5\u52a0\u7684\u9501 \uff0c\u53ea\u9488\u5bf9\u5f53\u524d\u64cd\u4f5c\u7684\u884c\u8bb0\u5f55\u8fdb\u884c\u52a0\u9501\u3002 \u884c\u7ea7\u9501\u80fd\u5927\u5927\u51cf\u5c11\u6570\u636e\u5e93\u64cd\u4f5c\u7684\u51b2\u7a81\u3002\u5176\u52a0\u9501\u7c92\u5ea6\u6700\u5c0f\uff0c\u5e76\u53d1\u5ea6\u9ad8\uff0c\u4f46\u52a0\u9501\u7684\u5f00\u9500\u4e5f\u6700\u5927\uff0c\u52a0\u9501\u6162\uff0c\u4f1a\u51fa\u73b0\u6b7b\u9501\u3002\u884c\u7ea7\u9501\u548c\u5b58\u50a8\u5f15\u64ce\u6709\u5173\uff0c\u662f\u5728\u5b58\u50a8\u5f15\u64ce\u5c42\u9762\u5b9e\u73b0\u7684\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E8%A1%8C%E7%BA%A7%E9%94%81%E7%9A%84%E4%BD%BF%E7%94%A8%E6%9C%89%E4%BB%80%E4%B9%88%E6%B3%A8%E6%84%8F%E4%BA%8B%E9%A1%B9%EF%BC%9F\"><\/span>\u884c\u7ea7\u9501\u7684\u4f7f\u7528\u6709\u4ec0\u4e48\u6ce8\u610f\u4e8b\u9879\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>InnoDB \u7684\u884c\u9501\u662f\u9488\u5bf9\u7d22\u5f15\u5b57\u6bb5\u52a0\u7684\u9501\uff0c\u8868\u7ea7\u9501\u662f\u9488\u5bf9\u975e\u7d22\u5f15\u5b57\u6bb5\u52a0\u7684\u9501\u3002\u5f53\u6211\u4eec\u6267\u884c UPDATE\u3001DELETE \u8bed\u53e5\u65f6\uff0c\u5982\u679c WHERE\u6761\u4ef6\u4e2d\u5b57\u6bb5\u6ca1\u6709\u547d\u4e2d\u552f\u4e00\u7d22\u5f15\u6216\u8005\u7d22\u5f15\u5931\u6548\u7684\u8bdd\uff0c\u5c31\u4f1a\u5bfc\u81f4\u626b\u63cf\u5168\u8868\u5bf9\u8868\u4e2d\u7684\u6240\u6709\u884c\u8bb0\u5f55\u8fdb\u884c\u52a0\u9501\u3002\u8fd9\u4e2a\u5728\u6211\u4eec\u65e5\u5e38\u5de5\u4f5c\u5f00\u53d1\u4e2d\u7ecf\u5e38\u4f1a\u9047\u5230\uff0c\u4e00\u5b9a\u8981\u591a\u591a\u6ce8\u610f\uff01\uff01\uff01<\/p>\n<h3><span class=\"ez-toc-section\" id=\"InnoDB_%E6%9C%89%E5%93%AA%E5%87%A0%E7%B1%BB%E8%A1%8C%E9%94%81%EF%BC%9F\"><\/span>InnoDB \u6709\u54ea\u51e0\u7c7b\u884c\u9501\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>InnoDB \u884c\u9501\u662f\u901a\u8fc7\u5bf9\u7d22\u5f15\u6570\u636e\u9875\u4e0a\u7684\u8bb0\u5f55\u52a0\u9501\u5b9e\u73b0\u7684\uff0cMySQL InnoDB \u652f\u6301\u4e09\u79cd\u884c\u9501\u5b9a\u65b9\u5f0f\uff1a<\/p>\n<p><strong>\u8bb0\u5f55\u9501\uff08Record Lock\uff09<\/strong>\uff1a\u5c5e\u4e8e\u5355\u4e2a\u884c\u8bb0\u5f55\u4e0a\u7684\u9501\u3002<br \/>\n<strong>\u95f4\u9699\u9501\uff08Gap Lock\uff09<\/strong>\uff1a\u9501\u5b9a\u4e00\u4e2a\u8303\u56f4\uff0c\u4e0d\u5305\u62ec\u8bb0\u5f55\u672c\u8eab\u3002<br \/>\n<strong>\u4e34\u952e\u9501\uff08Next-Key Lock\uff09<\/strong>\uff1aRecord Lock+Gap Lock\uff0c\u9501\u5b9a\u4e00\u4e2a\u8303\u56f4\uff0c\u5305\u542b\u8bb0\u5f55\u672c\u8eab\uff0c\u4e3b\u8981\u76ee\u7684\u662f\u4e3a\u4e86\u89e3\u51b3\u5e7b\u8bfb\u95ee\u9898\uff08MySQL \u4e8b\u52a1\u90e8\u5206\u63d0\u5230\u8fc7\uff09\u3002\u8bb0\u5f55\u9501\u53ea\u80fd\u9501\u4f4f\u5df2\u7ecf\u5b58\u5728\u7684\u8bb0\u5f55\uff0c\u4e3a\u4e86\u907f\u514d\u63d2\u5165\u65b0\u8bb0\u5f55\uff0c\u9700\u8981\u4f9d\u8d56\u95f4\u9699\u9501\u3002<\/p>\n<p><strong>\u5728 InnoDB \u9ed8\u8ba4\u7684\u9694\u79bb\u7ea7\u522b REPEATABLE-READ \u4e0b\uff0c\u884c\u9501\u9ed8\u8ba4\u4f7f\u7528\u7684\u662f Next-Key Lock\u3002\u4f46\u662f\uff0c\u5982\u679c\u64cd\u4f5c\u7684\u7d22\u5f15\u662f\u552f\u4e00\u7d22\u5f15\u6216\u4e3b\u952e\uff0cInnoDB \u4f1a\u5bf9 Next-Key Lock \u8fdb\u884c\u4f18\u5316\uff0c\u5c06\u5176\u964d\u7ea7\u4e3a Record Lock\uff0c\u5373\u4ec5\u9501\u4f4f\u7d22\u5f15\u672c\u8eab\uff0c\u800c\u4e0d\u662f\u8303\u56f4\u3002<\/strong><\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E5%85%B1%E4%BA%AB%E9%94%81%E5%92%8C%E6%8E%92%E4%BB%96%E9%94%81%E5%91%A2%EF%BC%9F\"><\/span>\u5171\u4eab\u9501\u548c\u6392\u4ed6\u9501\u5462\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u4e0d\u8bba\u662f\u8868\u7ea7\u9501\u8fd8\u662f\u884c\u7ea7\u9501\uff0c\u90fd\u5b58\u5728\u5171\u4eab\u9501\uff08Share Lock\uff0cS \u9501\uff09\u548c\u6392\u4ed6\u9501\uff08Exclusive Lock\uff0cX \u9501\uff09\u8fd9\u4e24\u7c7b\uff1a<br \/>\n<strong>\u5171\u4eab\u9501\uff08S \u9501\uff09<\/strong>\uff1a\u53c8\u79f0\u8bfb\u9501\uff0c\u4e8b\u52a1\u5728\u8bfb\u53d6\u8bb0\u5f55\u7684\u65f6\u5019\u83b7\u53d6\u5171\u4eab\u9501\uff0c\u5141\u8bb8\u591a\u4e2a\u4e8b\u52a1\u540c\u65f6\u83b7\u53d6\uff08\u9501\u517c\u5bb9\uff09\u3002<br \/>\n<strong>\u6392\u4ed6\u9501\uff08X \u9501\uff09<\/strong>\uff1a\u53c8\u79f0\u5199\u9501\/\u72ec\u5360\u9501\uff0c\u4e8b\u52a1\u5728\u4fee\u6539\u8bb0\u5f55\u7684\u65f6\u5019\u83b7\u53d6\u6392\u4ed6\u9501\uff0c\u4e0d\u5141\u8bb8\u591a\u4e2a\u4e8b\u52a1\u540c\u65f6\u83b7\u53d6\u3002\u5982\u679c\u4e00\u4e2a\u8bb0\u5f55\u5df2\u7ecf\u88ab\u52a0\u4e86\u6392\u4ed6\u9501\uff0c\u90a3\u5176\u4ed6\u4e8b\u52a1\u4e0d\u80fd\u518d\u5bf9\u8fd9\u6761\u4e8b\u52a1\u52a0\u4efb\u4f55\u7c7b\u578b\u7684\u9501\uff08\u9501\u4e0d\u517c\u5bb9\uff09<br \/>\n\u6392\u4ed6\u9501\u4e0e\u4efb\u4f55\u7684\u9501\u90fd\u4e0d\u517c\u5bb9\uff0c\u5171\u4eab\u9501\u4ec5\u548c\u5171\u4eab\u9501\u517c\u5bb9\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/yingjun.run\/wp-content\/uploads\/2025\/07\/image-1752469464235.png\" alt=\"file\" \/><\/p>\n<p>\u7531\u4e8e MVCC \u7684\u5b58\u5728\uff0c\u5bf9\u4e8e\u4e00\u822c\u7684 SELECT \u8bed\u53e5\uff0cInnoDB \u4e0d\u4f1a\u52a0\u4efb\u4f55\u9501\u3002\u4e0d\u8fc7\uff0c \u4f60\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u8bed\u53e5\u663e\u5f0f\u52a0\u5171\u4eab\u9501\u6216\u6392\u4ed6\u9501\u3002<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\"># \u5171\u4eab\u9501 \u53ef\u4ee5\u5728 MySQL 5.7 \u548c MySQL 8.0 \u4e2d\u4f7f\u7528\nSELECT ... LOCK IN SHARE MODE;\n# \u5171\u4eab\u9501 \u53ef\u4ee5\u5728 MySQL 8.0 \u4e2d\u4f7f\u7528\nSELECT ... FOR SHARE;\n# \u6392\u4ed6\u9501\nSELECT ... FOR UPDATE;<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"%E6%84%8F%E5%90%91%E9%94%81%E6%9C%89%E4%BB%80%E4%B9%88%E4%BD%9C%E7%94%A8%EF%BC%9F\"><\/span>\u610f\u5411\u9501\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u5982\u679c\u9700\u8981\u7528\u5230\u8868\u9501\u7684\u8bdd\uff0c\u5982\u4f55\u5224\u65ad\u8868\u4e2d\u7684\u8bb0\u5f55\u6ca1\u6709\u884c\u9501\u5462\uff0c\u4e00\u884c\u4e00\u884c\u904d\u5386\u80af\u5b9a\u662f\u4e0d\u884c\uff0c\u6027\u80fd\u592a\u5dee\u3002\u6211\u4eec\u9700\u8981\u7528\u5230\u4e00\u4e2a\u53eb\u505a\u610f\u5411\u9501\u7684\u4e1c\u4e1c\u6765\u5feb\u901f\u5224\u65ad\u662f\u5426\u53ef\u4ee5\u5bf9\u67d0\u4e2a\u8868\u4f7f\u7528\u8868\u9501\u3002<\/p>\n<p>\u610f\u5411\u9501\u662f\u8868\u7ea7\u9501\uff0c\u5171\u6709\u4e24\u79cd\uff1a<\/p>\n<p><strong>\u610f\u5411\u5171\u4eab\u9501\uff08Intention Shared Lock\uff0cIS \u9501\uff09<\/strong>\uff1a\u4e8b\u52a1\u6709\u610f\u5411\u5bf9\u8868\u4e2d\u7684\u67d0\u4e9b\u8bb0\u5f55\u52a0\u5171\u4eab\u9501\uff08S \u9501\uff09\uff0c\u52a0\u5171\u4eab\u9501\u524d\u5fc5\u987b\u5148\u53d6\u5f97\u8be5\u8868\u7684 IS \u9501\u3002<\/p>\n<p><strong>\u610f\u5411\u6392\u4ed6\u9501\uff08Intention Exclusive Lock\uff0cIX \u9501\uff09<\/strong>\uff1a\u4e8b\u52a1\u6709\u610f\u5411\u5bf9\u8868\u4e2d\u7684\u67d0\u4e9b\u8bb0\u5f55\u52a0\u6392\u4ed6\u9501\uff08X \u9501\uff09\uff0c\u52a0\u6392\u4ed6\u9501\u4e4b\u524d\u5fc5\u987b\u5148\u53d6\u5f97\u8be5\u8868\u7684 IX \u9501\u3002<\/p>\n<p><strong>\u610f\u5411\u9501\u662f\u7531\u6570\u636e\u5f15\u64ce\u81ea\u5df1\u7ef4\u62a4\u7684\uff0c\u7528\u6237\u65e0\u6cd5\u624b\u52a8\u64cd\u4f5c\u610f\u5411\u9501\uff0c\u5728\u4e3a\u6570\u636e\u884c\u52a0\u5171\u4eab\/\u6392\u4ed6\u9501\u4e4b\u524d\uff0cInnoDB \u4f1a\u5148\u83b7\u53d6\u8be5\u6570\u636e\u884c\u6240\u5728\u5728\u6570\u636e\u8868\u7684\u5bf9\u5e94\u610f\u5411\u9501\u3002<\/strong><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/yingjun.run\/wp-content\/uploads\/2025\/07\/image-1752469559984.png\" alt=\"file\" \/><\/p>\n<p>\u610f\u5411\u9501\u548c\u5171\u4eab\u9501\u548c\u6392\u5b83\u9501\u4e92\u65a5\uff08\u8fd9\u91cc\u6307\u7684\u662f\u8868\u7ea7\u522b\u7684\u5171\u4eab\u9501\u548c\u6392\u4ed6\u9501\uff0c\u610f\u5411\u9501\u4e0d\u4f1a\u4e0e\u884c\u7ea7\u7684\u5171\u4eab\u9501\u548c\u6392\u4ed6\u9501\u4e92\u65a5\uff09\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/yingjun.run\/wp-content\/uploads\/2025\/07\/image-1752469569748.png\" alt=\"file\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"%E5%BD%93%E5%89%8D%E8%AF%BB%E5%92%8C%E5%BF%AB%E7%85%A7%E8%AF%BB%E6%9C%89%E4%BB%80%E4%B9%88%E5%8C%BA%E5%88%AB%EF%BC%9F\"><\/span>\u5f53\u524d\u8bfb\u548c\u5feb\u7167\u8bfb\u6709\u4ec0\u4e48\u533a\u522b\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>\u5feb\u7167\u8bfb<\/strong>\uff08\u4e00\u81f4\u6027\u975e\u9501\u5b9a\u8bfb\uff09\u5c31\u662f\u5355\u7eaf\u7684 SELECT \u8bed\u53e5\uff0c\u4f46\u4e0d\u5305\u62ec\u4e0b\u9762\u8fd9\u4e24\u7c7b SELECT \u8bed\u53e5\uff1a<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">SELECT ... FOR UPDATE\n# \u5171\u4eab\u9501 \u53ef\u4ee5\u5728 MySQL 5.7 \u548c MySQL 8.0 \u4e2d\u4f7f\u7528\nSELECT ... LOCK IN SHARE MODE;\n# \u5171\u4eab\u9501 \u53ef\u4ee5\u5728 MySQL 8.0 \u4e2d\u4f7f\u7528\nSELECT ... FOR SHARE;<\/code><\/pre>\n<p>\u5feb\u7167\u5373\u8bb0\u5f55\u7684\u5386\u53f2\u7248\u672c\uff0c\u6bcf\u884c\u8bb0\u5f55\u53ef\u80fd\u5b58\u5728\u591a\u4e2a\u5386\u53f2\u7248\u672c\uff08\u591a\u7248\u672c\u6280\u672f\uff09\u3002<\/p>\n<p>\u5feb\u7167\u8bfb\u7684\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u8bfb\u53d6\u7684\u8bb0\u5f55\u6b63\u5728\u6267\u884c UPDATE\/DELETE \u64cd\u4f5c\uff0c\u8bfb\u53d6\u64cd\u4f5c\u4e0d\u4f1a\u56e0\u6b64\u53bb\u7b49\u5f85\u8bb0\u5f55\u4e0a X \u9501\u7684\u91ca\u653e\uff0c\u800c\u662f\u4f1a\u53bb\u8bfb\u53d6\u884c\u7684\u4e00\u4e2a\u5feb\u7167\u3002<br \/>\n\u53ea\u6709\u5728\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b RC(\u8bfb\u53d6\u5df2\u63d0\u4ea4) \u548c RR\uff08\u53ef\u91cd\u8bfb\uff09\u4e0b\uff0cInnoDB \u624d\u4f1a\u4f7f\u7528\u4e00\u81f4\u6027\u975e\u9501\u5b9a\u8bfb\uff1a<br \/>\n\u5728 RC \u7ea7\u522b\u4e0b\uff0c\u5bf9\u4e8e\u5feb\u7167\u6570\u636e\uff0c\u4e00\u81f4\u6027\u975e\u9501\u5b9a\u8bfb\u603b\u662f\u8bfb\u53d6\u88ab\u9501\u5b9a\u884c\u7684\u6700\u65b0\u4e00\u4efd\u5feb\u7167\u6570\u636e\u3002<br \/>\n\u5728 RR \u7ea7\u522b\u4e0b\uff0c\u5bf9\u4e8e\u5feb\u7167\u6570\u636e\uff0c\u4e00\u81f4\u6027\u975e\u9501\u5b9a\u8bfb\u603b\u662f\u8bfb\u53d6\u672c\u4e8b\u52a1\u5f00\u59cb\u65f6\u7684\u884c\u6570\u636e\u7248\u672c\u3002<\/p>\n<p><strong>\u5f53\u524d\u8bfb <\/strong>\uff08\u4e00\u81f4\u6027\u9501\u5b9a\u8bfb\uff09\u5c31\u662f\u7ed9\u884c\u8bb0\u5f55\u52a0 X \u9501\u6216 S \u9501\u3002<\/p>\n<p>\u5f53\u524d\u8bfb\u7684\u4e00\u4e9b\u5e38\u89c1 SQL \u8bed\u53e5\u7c7b\u578b\u5982\u4e0b\uff1a<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\"># \u5bf9\u8bfb\u7684\u8bb0\u5f55\u52a0\u4e00\u4e2aX\u9501\nSELECT...FOR UPDATE\n# \u5bf9\u8bfb\u7684\u8bb0\u5f55\u52a0\u4e00\u4e2aS\u9501\nSELECT...LOCK IN SHARE MODE\n# \u5bf9\u8bfb\u7684\u8bb0\u5f55\u52a0\u4e00\u4e2aS\u9501\nSELECT...FOR SHARE\n# \u5bf9\u4fee\u6539\u7684\u8bb0\u5f55\u52a0\u4e00\u4e2aX\u9501\nINSERT...\nUPDATE...\nDELETE...<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"%E8%87%AA%E5%A2%9E%E9%94%81%E6%9C%89%E4%BA%86%E8%A7%A3%E5%90%97%EF%BC%9F\"><\/span>\u81ea\u589e\u9501\u6709\u4e86\u89e3\u5417\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u5173\u7cfb\u578b\u6570\u636e\u5e93\u8bbe\u8ba1\u8868\u7684\u65f6\u5019\uff0c\u901a\u5e38\u4f1a\u6709\u4e00\u5217\u4f5c\u4e3a\u81ea\u589e\u4e3b\u952e\u3002InnoDB \u4e2d\u7684\u81ea\u589e\u4e3b\u952e\u4f1a\u6d89\u53ca\u4e00\u79cd\u6bd4\u8f83\u7279\u6b8a\u7684\u8868\u7ea7\u9501\u2014 <strong>\u81ea\u589e\u9501<\/strong>\uff08AUTO-INC Locks\uff09 \u3002<\/p>\n<pre class=\"prettyprint linenums\" ><code class=\"language-java\">CREATE TABLE `sequence_id` (\n  `id` BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,\n  `stub` CHAR(10) NOT NULL DEFAULT &#039;&#039;,\n  PRIMARY KEY (`id`),\n  UNIQUE KEY `stub` (`stub`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;<\/code><\/pre>\n<p>\u66f4\u51c6\u786e\u70b9\u6765\u8bf4\uff0c\u4e0d\u4ec5\u4ec5\u662f\u81ea\u589e\u4e3b\u952e\uff0cAUTO_INCREMENT\u7684\u5217\u90fd\u4f1a\u6d89\u53ca\u5230\u81ea\u589e\u9501\uff0c\u6bd5\u7adf\u975e\u4e3b\u952e\u4e5f\u53ef\u4ee5\u8bbe\u7f6e\u81ea\u589e\u957f<\/p>\n<p>\u5982\u679c\u4e00\u4e2a\u4e8b\u52a1\u6b63\u5728\u63d2\u5165\u6570\u636e\u5230\u6709\u81ea\u589e\u5217\u7684\u8868\u65f6\uff0c\u4f1a\u5148\u83b7\u53d6\u81ea\u589e\u9501\uff0c\u62ff\u4e0d\u5230\u5c31\u53ef\u80fd\u4f1a\u88ab\u963b\u585e\u4f4f\u3002\u8fd9\u91cc\u7684\u963b\u585e\u884c\u4e3a\u53ea\u662f\u81ea\u589e\u9501\u884c\u4e3a\u7684\u5176\u4e2d\u4e00\u79cd\uff0c\u53ef\u4ee5\u7406\u89e3\u4e3a\u81ea\u589e\u9501\u5c31\u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u5176\u5177\u4f53\u7684\u5b9e\u73b0\u6709\u591a\u79cd\u3002\u5177\u4f53\u7684\u914d\u7f6e\u9879\u4e3a innodb_autoinc_lock_mode \uff08MySQL 5.1.22 \u5f15\u5165\uff09\uff0c\u53ef\u4ee5\u9009\u62e9\u7684\u503c\u5982\u4e0b\uff1a<br \/>\n<img decoding=\"async\" src=\"https:\/\/yingjun.run\/wp-content\/uploads\/2025\/07\/image-1752469758753.png\" alt=\"file\" \/><\/p>\n<p>\u4ea4\u9519\u6a21\u5f0f\u4e0b\uff0c\u6240\u6709\u7684\u201cINSERT-LIKE\u201d\u8bed\u53e5\uff08\u6240\u6709\u7684\u63d2\u5165\u8bed\u53e5\uff0c\u5305\u62ec\uff1aINSERT\u3001REPLACE\u3001INSERT\u2026SELECT\u3001REPLACE\u2026SELECT\u3001LOAD DATA\u7b49\uff09\u90fd\u4e0d\u4f7f\u7528\u8868\u7ea7\u9501\uff0c\u4f7f\u7528\u7684\u662f\u8f7b\u91cf\u7ea7\u4e92\u65a5\u9501\u5b9e\u73b0\uff0c\u591a\u6761\u63d2\u5165\u8bed\u53e5\u53ef\u4ee5\u5e76\u53d1\u6267\u884c\uff0c\u901f\u5ea6\u66f4\u5feb\uff0c\u6269\u5c55\u6027\u4e5f\u66f4\u597d\u3002<\/p>\n<p>\u4e0d\u8fc7\uff0c\u5982\u679c\u4f60\u7684 MySQL \u6570\u636e\u5e93\u6709\u4e3b\u4ece\u540c\u6b65\u9700\u6c42\u5e76\u4e14 Binlog \u5b58\u50a8\u683c\u5f0f\u4e3a Statement \u7684\u8bdd\uff0c\u4e0d\u8981\u5c06 InnoDB \u81ea\u589e\u9501\u6a21\u5f0f\u8bbe\u7f6e\u4e3a\u4ea4\u53c9\u6a21\u5f0f\uff0c\u4e0d\u7136\u4f1a\u6709\u6570\u636e\u4e0d\u4e00\u81f4\u6027\u95ee\u9898\u3002\u8fd9\u662f\u56e0\u4e3a\u5e76\u53d1\u60c5\u51b5\u4e0b\u63d2\u5165\u8bed\u53e5\u7684\u6267\u884c\u987a\u5e8f\u5c31\u65e0\u6cd5\u5f97\u5230\u4fdd\u969c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4ec0\u4e48\u662f\u5173\u7cfb\u578b\u6570\u636e\u5e93\uff1f \u987e\u540d\u601d\u4e49\uff0c\u5173\u7cfb\u578b\u6570\u636e\u5e93\uff08RDB\uff0cRelational Database\uff09\u5c31\u662f\u4e00\u79cd\u5efa\u7acb\u5728\u5173\u7cfb\u6a21\u578b\u7684\u57fa\u7840\u4e0a\u7684\u6570\u636e\u5e93\u3002\u5173\u7cfb\u6a21\u578b\u8868\u660e\u4e86\u6570\u636e\u5e93\u4e2d\u6240\u5b58\u50a8\u7684\u6570\u636e\u4e4b\u95f4\u7684\u8054\u7cfb\uff08\u4e00\u5bf9\u4e00\u3001\u4e00\u5bf9\u591a\u3001\u591a\u5bf9\u591a\uff09\u3002 \u6709\u54ea\u4e9b\u5e38\u89c1\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\u5462\uff1f MySQL\u3001PostgreSQL\u3001Oracle\u3001SQL Server\u3001SQLite\uff08\u5fae\u4fe1\u672c\u5730\u7684\u804a\u5929\u8bb0\u5f55\u7684\u5b58\u50a8\u5c31\u662f\u7528\u7684 SQLite\uff09 MySQL \u6709\u4ec0\u4e48\u4f18\u70b9\uff1f \u6574 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":187,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-181","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java"],"_links":{"self":[{"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/posts\/181","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/comments?post=181"}],"version-history":[{"count":2,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/posts\/181\/revisions"}],"predecessor-version":[{"id":198,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/posts\/181\/revisions\/198"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/media\/187"}],"wp:attachment":[{"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/media?parent=181"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/categories?post=181"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yingjun.run\/index.php\/wp-json\/wp\/v2\/tags?post=181"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}