{"id":11500,"date":"2025-06-12T11:27:08","date_gmt":"2025-06-12T03:27:08","guid":{"rendered":"https:\/\/egonlin.com\/?p=11500"},"modified":"2025-06-12T16:28:58","modified_gmt":"2025-06-12T08:28:58","slug":"innodb%e5%ad%98%e5%82%a8%e5%bc%95%e6%93%8e%e7%b4%a2%e5%bc%95%e7%9f%a5%e8%af%86%e5%b0%8f%e8%8a%82","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=11500","title":{"rendered":"innodb\u5b58\u50a8\u5f15\u64ce\u7d22\u5f15\u77e5\u8bc6\u5c0f\u8282"},"content":{"rendered":"<pre>InnoDB\u5b58\u50a8\u5f15\u64ce\u652f\u6301\u4e24\u79cd\u5e38\u89c1\u7684\u7d22\u5f15\uff1aB+\u6811\u7d22\u5f15\u3001Hash\u7d22\u5f15\u3002\r\n\r\nB+\u6811\u7d22\u5f15\u662f\u76ee\u524d\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7cfb\u7edf\u4e2d\u6700\u5e38\u89c1\u3001\u6700\u6709\u6548\u7684\u7d22\u5f15\u3002\r\n\r\nB+\u6811\u4e2d\u7684B\u4ee3\u8868\u7684\u4e0d\u662f\u4e8c\u53c9\uff08binary\uff09\uff0c\u800c\u662f\u5e73\u8861\uff08balance\uff09\uff0c\u6240\u4ee5\uff0cB+\u6811\u662f\u5e73\u8861\u6811\u5e76\u4e0d\u662f\u4e8c\u53c9\u6811\u3002\r\n\r\nB+\u6811\u7d22\u5f15\u80fd\u627e\u5230\u7684\u53ea\u662f\u88ab\u67e5\u627e\u6570\u636e\u884c\u6240\u5728\u7684\u9875\u3002\u7136\u540e\u6570\u636e\u5e93\u628a\u9875\u8bfb\u5165\u5185\u5b58\uff0c\u518d\u4ece\u5185\u5b58\u4e2d\u8fdb\u884c\u67e5\u627e\uff0c\u6700\u540e\u5f97\u5230\u8981\u67e5\u627e\u7684\u6570\u636e\u3002\r\n\r\n\u5728\u6570\u636e\u5e93\u4e2d\uff0cB+\u6811\u7684\u9ad8\u5ea6\u4e00\u822c\u57282-3\u5c42\uff0c\u4e5f\u5c31\u610f\u5473\u7740\u5728\u67e5\u627e\u67d0\u4e00\u4e2a\u952e\u6240\u5bf9\u5e94\u7684\u503c\u7684\u65f6\u5019\uff0c\u5927\u6982\u9700\u89812-3\u6b21IO\u3002\r\n\r\n\u6570\u636e\u5e93\u4e2d\u7684B+\u6811\u7d22\u5f15\u5206\u4e3a\u805a\u96c6\u7d22\u5f15\u548c\u975e\u805a\u96c6\u7d22\u5f15\uff08\u8f85\u52a9\u7d22\u5f15\uff09\r\n\r\n\u805a\u96c6\u7d22\u5f15\u5c31\u662f\u6309\u7167\u6bcf\u5f20\u8868\u7684\u4e3b\u952e\u6784\u9020\u4e00\u4e2aB+\u6811\uff0cB+\u6811\u7684\u4e00\u4e2a\u53f6\u5b50\u51e0\u70b9\u4e2d\u8bb0\u5f55\u7740\u8868\u4e2d\u4e00\u884c\u8bb0\u5f55\u7684\u6240\u6709\u503c\u3002\u53ea\u8981\u627e\u5230\u8fd9\u4e2a\u53f6\u5b50\u8282\u70b9\u4e5f\u5c31\u5f97\u5230\u4e86\u8fd9\u6761\u8bb0\u5f55\u7684\u6240\u6709\u503c\u3002\r\n\r\n\u8f85\u52a9\u7d22\u5f15\u7684\u53f6\u8282\u70b9\u4e2d\u4e0d\u5305\u542b\u884c\u8bb0\u5f55\u7684\u6240\u6709\u503c\u3002\u53ea\u5305\u542b\u4e00\u4e2a\u952e\u503c\u548c\u4e00\u4e2a\u4e66\u7b7e\uff08bookmark\uff09\uff0c\u4e66\u7b7e\u7528\u4e8e\u5b9a\u4f4d\u4e0e\u7d22\u5f15\u5bf9\u5e94\u7684\u6570\u636e\u884c\u3002\r\n\r\n\u6bcf\u5f20\u8868\u53ea\u80fd\u6709\u4e00\u4e2a\u805a\u96c6\u7d22\u5f15\uff0c\u53ef\u4ee5\u6709\u591a\u4e2a\u8f85\u52a9\u7d22\u5f15\u3002\r\n\r\n\u8f85\u52a9\u7d22\u5f15\u901a\u8fc7\u53f6\u7ea7\u522b\u7684\u6307\u9488\u83b7\u5f97\u6307\u5411\u4e3b\u952e\u7684\u7d22\u5f15\uff0c\u7136\u540e\u518d\u901a\u8fc7\u805a\u96c6\u7d22\u5f15\u5b9a\u4f4d\u6570\u636e\u884c\u3002\r\n\r\n\u5bf9\u4e8e\u7d22\u5f15\u7684\u6dfb\u52a0\u6216\u5220\u9664\u64cd\u4f5c\uff0cMySql\u6570\u636e\u5e93\u4f1a\u5148\u521b\u5efa\u4e00\u5f20\u4e34\u65f6\u8868\uff0c\u7136\u540e\u628a\u6570\u636e\u5bfc\u5165\u4e34\u65f6\u8868\u4e2d\uff0c\u5220\u9664\u539f\u8868\uff0c\u518d\u628a\u4e34\u65f6\u8868\u540d\u6539\u4e3a\u539f\u6765\u7684\u8868\u540d\u3002\u6240\u4ee5\uff0c\u589e\u52a0\u548c\u5220\u9664\u7d22\u5f15\u6709\u6210\u672c\u3002\r\n\r\n\u5f53\u67d0\u4e2a\u5b57\u6bb5\u7684\u53d6\u503c\u5206\u5e03\u8303\u56f4\u6bd4\u8f83\u5e7f\u7684\u65f6\u5019\uff08\u9ad8\u9009\u62e9\u6027\uff09\u9002\u5408\u4f7f\u7528B+\u6811\u7d22\u5f15\u3002\u5982\u679c\u67d0\u5b57\u6bb5\u53ea\u6709Y\u548cN\u4e24\u4e2a\u53d6\u503c\uff0c\u90a3\u4e48\u6ca1\u5fc5\u8981\u4f7f\u7528\u7d22\u5f15\u3002\r\n\r\n\u5982\u679c\u8981\u67e5\u8be2\u7684\u5b57\u6bb5\u5177\u6709\u9ad8\u9009\u62e9\u6027\uff0c\u4f46\u662f\u672c\u6b21\u68c0\u7d22\u7684\u6570\u636e\u5360\u603b\u6570\u636e\u91cf\u7684\u4e00\u534a\u4ee5\u4e0a\u65f6\uff0cMySql\u5c31\u4e0d\u4f1a\u4f7f\u7528\u7d22\u5f15\u8fdb\u884c\u67e5\u8be2\u3002\r\n\r\n\u8054\u5408\u7d22\u5f15\u662f\u6307\u5bf9\u8868\u4e0a\u7684\u591a\u4e2a\u5217\u505a\u7d22\u5f15\u3002\r\n\r\n\u5982\u679c\u6709\u4e00\u4e2a3\u5217\u7d22\u5f15(col1,col2,col3)\uff0c\u5219\u5df2\u7ecf\u5bf9(col1)\u3001(col1,col2)\u3001(col1,col3)\u548c(col1,col2,col3)\u4e0a\u5efa\u7acb\u4e86\u7d22\u5f15\uff1b\u8fd9\u5c31\u662f\u6700\u5de6\u524d\u7f00\u539f\u5219\u3002\r\n\r\n\u641c\u7d22\u7684\u7d22\u5f15\u5217\uff0c\u4e0d\u4e00\u5b9a\u662f\u6240\u8981\u9009\u62e9\u7684\u5217\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u6700\u9002\u5408\u7d22\u5f15\u7684\u5217\u662f\u51fa\u73b0\u5728 WHERE \u5b50\u53e5\u4e2d\u7684\u5217\uff0c\u6216\u8fde\u63a5\u5b50\u53e5\u4e2d\u6307\u5b9a\u7684\u5217\uff0c\u800c\u4e0d\u662f\u51fa\u73b0\u5728 SELECT \u5173\u952e\u5b57\u540e\u7684\u9009\u62e9\u5217\u8868\u4e2d\u7684\u5217\u3002\r\n\r\n\u4f7f\u7528\u77ed\u7d22\u5f15\u3002\u5982\u679c\u5bf9\u5b57\u7b26\u4e32\u5217\u8fdb\u884c\u7d22\u5f15\uff0c\u5e94\u8be5\u6307\u5b9a\u4e00\u4e2a\u524d\u7f00\u957f\u5ea6,\u53ea\u8981\u6709\u53ef\u80fd\u5c31\u5e94 \u8be5\u8fd9\u6837\u505a\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6709\u4e00\u4e2a CHAR(200)\u5217,\u5982\u679c\u5728\u524d 10 \u4e2a\u6216 20 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