{"id":197398,"date":"2020-09-07T10:10:29","date_gmt":"2020-09-07T02:10:29","guid":{"rendered":"https:\/\/lrxjmw.cn\/?p=197398"},"modified":"2020-08-28T10:11:06","modified_gmt":"2020-08-28T02:11:06","slug":"underlying-principles-innodb","status":"publish","type":"post","link":"https:\/\/lrxjmw.cn\/underlying-principles-innodb.html","title":{"rendered":"\u65e0\u6c34\u5e72\u8d27\uff1aInnoDB\u5e95\u5c42\u539f\u7406"},"content":{"rendered":"<table>\n<tbody>\n<tr>\n<td style=\"padding: 5px 12px; width: 25px; font-size: 22px; text-align: center; background: #E8E8E8; line-height: 30px; color: #999;\">\u5bfc\u8bfb<\/td>\n<td style=\"padding: 10px 10px 12px; line-height: 20px;\"><strong>\u5f88\u591a\u6587\u7ae0\u90fd\u662f\u76f4\u63a5\u5f00\u59cb\u4ecb\u7ecd\u6709\u54ea\u4e9b\u5b58\u50a8\u5f15\u64ce\uff0c\u5e76\u6ca1\u6709\u53bb\u4ecb\u7ecd\u5b58\u50a8\u5f15\u64ce\u672c\u8eab\u3002\u90a3\u4e48\u7a76\u7adf\u4ec0\u4e48\u662f\u5b58\u50a8\u5f15\u64ce?\u4e0d\u77e5\u9053\u5927\u5bb6\u6709\u6ca1\u6709\u60f3\u8fc7\uff0cMySQL\u662f\u5982\u4f55\u5b58\u50a8\u6211\u4eec\u4e22\u8fdb\u53bb\u7684\u6570\u636e\u7684?<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/07\/11-2.jpg\" alt=\"\" width=\"500\" height=\"366\" class=\"alignnone size-full wp-image-197399\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/07\/11-2.jpg 500w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/07\/11-2-300x220.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; 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color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u63d2\u5165\u7f13\u51b2<\/strong><\/div>\n<p>\u63d2\u5165\u7f13\u51b2\u9488\u5bf9\u7684\u64cd\u4f5c\u662f\u66f4\u65b0\u6216\u8005\u63d2\u5165\uff0c\u6211\u4eec\u8003\u8651\u6700\u574f\u7684\u60c5\u51b5\uff0c\u90a3\u5c31\u662f\u9700\u8981\u66f4\u65b0\u7684\u6570\u636e\u90fd\u4e0d\u5728\u7f13\u51b2\u6c60\u4e2d\u3002\u90a3\u4e48\u6b64\u65f6\u4f1a\u6709\u4e0b\u9762\u4e24\u79cd\u65b9\u6848\u3002<\/p>\n<p>\u6765\u4e00\u6761\u6570\u636e\u5c31\u76f4\u63a5\u5199\u5165\u78c1\u76d8<br \/>\n\u7b49\u6570\u636e\u8fbe\u5230\u67d0\u4e2a\u9608\u503c(\u4f8b\u598250\u6761)\u624d\u6279\u91cf\u7684\u5199\u5165\u78c1\u76d8<br \/>\n\u5f88\u660e\u663e\uff0c\u7b2c\u4e8c\u79cd\u65b9\u6848\u8981\u597d\u4e00\u70b9\uff0c\u51cf\u5c11\u4e86\u4e0e\u78c1\u76d8IO\u7684\u4ea4\u4e92\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u4e24\u6b21\u5199<\/strong><\/div>\n<p>\u9274\u4e8e\u90fd\u804a\u5230\u4e86\u63d2\u5165\u7f13\u51b2\uff0c\u6211\u5c31\u4e0d\u5f97\u4e0d\u9700\u8981\u63d0\u4e00\u5634\u4e24\u6b21\u5199\uff0c\u56e0\u4e3a\u6211\u8ba4\u4e3a\u8fd9\u4e24\u4e2aInnoDB\u7684\u7279\u6027\u662f\u76f8\u8f85\u76f8\u6210\u7684\u3002<\/p>\n<p>\u63d2\u5165\u7f13\u51b2\u63d0\u9ad8\u4e86MySQL\u7684\u6027\u80fd\uff0c\u800c\u4e24\u6b21\u5199\u5219\u5728\u6b64\u57fa\u7840\u4e0a\u63d0\u9ad8\u4e86\u6570\u636e\u7684\u53ef\u9760\u6027\u3002\u6211\u4eec\u77e5\u9053\uff0c\u5f53\u6570\u636e\u8fd8\u5728\u7f13\u51b2\u6c60\u4e2d\u7684\u65f6\u5019\uff0c\u5f53\u673a\u5668\u5b95\u673a\u4e86\uff0c\u53d1\u751f\u4e86\u5199\u5931\u6548\uff0c\u6709Redo Log\u6765\u8fdb\u884c\u6062\u590d\u3002\u4f46\u662f\u5982\u679c\u662f\u5728\u4ece\u7f13\u51b2\u6c60\u4e2d\u5c06\u6570\u636e\u5237\u56de\u78c1\u76d8\u7684\u65f6\u5019\u5b95\u673a\u4e86\u5462?<\/p>\n<p>\u8fd9\u79cd\u60c5\u51b5\u53eb\u505a\u90e8\u5206\u5199\u5931\u6548\uff0c\u6b64\u65f6\u91cd\u505a\u65e5\u5fd7\u5c31\u65e0\u6cd5\u89e3\u51b3\u95ee\u9898\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/07\/11-2-1.jpg\" alt=\"\" width=\"576\" height=\"374\" class=\"alignnone size-full wp-image-197400\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/07\/11-2-1.jpg 576w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/07\/11-2-1-300x195.jpg 300w\" sizes=\"auto, (max-width: 576px) 100vw, 576px\" \/><\/p>\n<p>\u5728\u5237\u810f\u9875\u65f6\uff0c\u5e76\u4e0d\u662f\u76f4\u63a5\u5237\u5165\u78c1\u76d8\uff0c\u800c\u662fcopy\u5230\u5185\u5b58\u4e2d\u7684Doublewrite Buffer\u4e2d\uff0c\u7136\u540e\u518d\u62f7\u8d1d\u81f3\u78c1\u76d8\u5171\u4eab\u8868\u7a7a\u95f4(\u4f60\u53ef\u4ee5\u5c31\u7406\u89e3\u4e3a\u78c1\u76d8)\u4e2d\uff0c\u6bcf\u6b21\u5199\u51651M\uff0c\u7b49copy\u5b8c\u6210\u540e\uff0c\u518d\u5c06Doublewrite Buffer\u4e2d\u7684\u9875\u5199\u5165\u78c1\u76d8\u6587\u4ef6\u3002<\/p>\n<p>\u6709\u4e86\u4e24\u6b21\u5199\u673a\u5236\uff0c\u5373\u4f7f\u5728\u5237\u810f\u9875\u65f6\u5b95\u673a\u4e86\uff0c\u5728\u5b9e\u4f8b\u6062\u590d\u7684\u65f6\u5019\u4e5f\u53ef\u4ee5\u4ece\u5171\u4eab\u8868\u7a7a\u95f4\u4e2d\u627e\u5230Doublewrite Buffer\u7684\u9875\u526f\u672c\uff0c\u76f4\u63a5\u5c06\u5176\u8986\u76d6\u539f\u6765\u7684\u6570\u636e\u9875\u5373\u53ef\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u81ea\u9002\u5e94\u54c8\u5e0c\u7d22\u5f15<\/strong><\/div>\n<p>\u81ea\u9002\u5e94\u7d22\u5f15\u5c31\u8ddfJVM\u5728\u8fd0\u884c\u8fc7\u7a0b\u4e2d\uff0c\u4f1a\u52a8\u6001\u7684\u628a\u67d0\u4e9b\u70ed\u70b9\u4ee3\u7801\u7f16\u8bd1\u6210Machine Code\u4e00\u6837\uff0cInnoDB\u4f1a\u76d1\u63a7\u5bf9\u6240\u6709\u7d22\u5f15\u7684\u67e5\u8be2\uff0c\u5bf9\u70ed\u70b9\u8bbf\u95ee\u7684\u9875\u5efa\u7acb\u54c8\u5e0c\u7d22\u5f15\uff0c\u4ee5\u6b64\u6765\u63d0\u5347\u8bbf\u95ee\u901f\u5ea6\u3002<\/p>\n<p>\u4f60\u53ef\u80fd\u591a\u6b21\u770b\u5230\u4e86\u4e00\u4e2a\u5173\u952e\u5b57\u9875\uff0c\u63a5\u4e0b\u6765\u90a3\u6211\u4eec\u5c31\u6765\u804a\u4e00\u4e0b\u9875\u662f\u4ec0\u4e48?<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u9875<\/strong><\/div>\n<p>\u9875\uff0c\u662fInnoDB\u4e2d\u6570\u636e\u7ba1\u7406\u7684\u6700\u5c0f\u5355\u4f4d\u3002\u5f53\u6211\u4eec\u67e5\u8be2\u6570\u636e\u65f6\uff0c\u5176\u662f\u4ee5\u9875\u4e3a\u5355\u4f4d\uff0c\u5c06\u78c1\u76d8\u4e2d\u7684\u6570\u636e\u52a0\u8f7d\u5230\u7f13\u51b2\u6c60\u4e2d\u7684\u3002\u540c\u7406\uff0c\u66f4\u65b0\u6570\u636e\u4e5f\u662f\u4ee5\u9875\u4e3a\u5355\u4f4d\uff0c\u5c06\u6211\u4eec\u5bf9\u6570\u636e\u7684\u4fee\u6539\u5237\u56de\u78c1\u76d8\u3002\u6bcf\u9875\u7684\u9ed8\u8ba4\u5927\u5c0f\u4e3a16k\uff0c\u6bcf\u9875\u4e2d\u5305\u542b\u4e86\u82e5\u5e72\u884c\u7684\u6570\u636e\uff0c\u9875\u7684\u7ed3\u6784\u5982\u4e0b\u56fe\u6240\u793a\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/07\/11-3.jpg\" alt=\"\" width=\"371\" height=\"301\" class=\"alignnone size-full wp-image-197401\" srcset=\"https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/07\/11-3.jpg 371w, https:\/\/lrxjmw.cn\/wp-content\/uploads\/2020\/07\/11-3-300x243.jpg 300w\" sizes=\"auto, (max-width: 371px) 100vw, 371px\" \/><\/p>\n<p>\u4e0d\u7528\u592a\u7ea0\u7ed3\u6bcf\u4e2a\u533a\u662f\u5e72\u561b\u7684\uff0c\u6211\u4eec\u53ea\u9700\u8981\u77e5\u9053\u8fd9\u6837\u8bbe\u8ba1\u7684\u597d\u5904\u5728\u54ea\u513f\u3002\u6bcf\u4e00\u9875\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u901a\u8fc7FileHeader\u4e2d\u7684\u4e0a\u4e00\u4e0b\u548c\u4e0b\u4e00\u9875\u7684\u6570\u636e\uff0c\u9875\u4e0e\u9875\u4e4b\u95f4\u53ef\u4ee5\u5f62\u6210\u53cc\u5411\u94fe\u8868\u3002\u56e0\u4e3a\u5728\u5b9e\u9645\u7684\u7269\u7406\u5b58\u50a8\u4e0a\uff0c\u6570\u636e\u5e76\u4e0d\u662f\u8fde\u7eed\u5b58\u50a8\u7684\u3002\u4f60\u53ef\u4ee5\u628a\u4ed6\u7406\u89e3\u6210G1\u7684Region\u5728\u5185\u5b58\u4e2d\u7684\u5206\u5e03\u3002<\/p>\n<p>\u800c\u4e00\u9875\u4e2d\u6240\u5305\u542b\u7684\u884c\u6570\u636e\uff0c\u884c\u4e0e\u884c\u4e4b\u95f4\u5219\u5f62\u6210\u4e86\u5355\u5411\u94fe\u8868\u3002\u6211\u4eec\u5b58\u5165\u7684\u884c\u6570\u636e\u6700\u7ec8\u4f1a\u5230User Records\u4e2d\uff0c\u5f53\u7136\u6700\u521dUser Records\u5e76\u4e0d\u5360\u636e\u4efb\u4f55\u5b58\u50a8\u7a7a\u95f4\u3002\u968f\u7740\u6211\u4eec\u5b58\u5165\u7684\u6570\u636e\u8d8a\u6765\u8d8a\u591a\uff0cUser Records\u4f1a\u8d8a\u6765\u8d8a\u5927\uff0cFree Space\u7684\u7a7a\u95f4\u4f1a\u8d8a\u6765\u8d8a\u5c0f\uff0c\u76f4\u5230\u88ab\u5360\u7528\u5b8c\uff0c\u5c31\u4f1a\u7533\u8bf7\u65b0\u7684\u6570\u636e\u9875\u3002<\/p>\n<p>User Records\u4e2d\u7684\u6570\u636e\uff0c\u662f\u6309\u7167\u4e3b\u952eid\u6765\u8fdb\u884c\u6392\u5e8f\u7684\uff0c\u5f53\u6211\u4eec\u6309\u7167\u4e3b\u952e\u6765\u8fdb\u884c\u67e5\u627e\u65f6\uff0c\u4f1a\u6cbf\u7740\u8fd9\u4e2a\u5355\u5411\u94fe\u8868\u4e00\u76f4\u5f80\u540e\u627e\uff0c<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u91cd\u505a\u65e5\u5fd7\u7f13\u51b2<\/strong><\/div>\n<p>\u4e0a\u9762\u804a\u8fc7\uff0cInnoDB\u4e2d\u7f13\u51b2\u6c60\u4e2d\u7684\u9875\u6570\u636e\u66f4\u65b0\u4f1a\u5148\u4e8e\u78c1\u76d8\u6570\u636e\u66f4\u65b0\u7684\uff0cInnoDB\u4e5f\u4f1a\u91c7\u7528\u65e5\u5fd7\u5148\u884c(Write Ahead Log)\u7b56\u7565\u6765\u5237\u65b0\u6570\u636e\uff0c\u4ec0\u4e48\u610f\u601d\u5462?\u5f53\u4e8b\u52a1\u5f00\u59cb\u65f6\uff0c\u4f1a\u5148\u8bb0\u5f55Redo Log\u5230Redo Log Buffer\u4e2d\uff0c\u7136\u540e\u518d\u66f4\u65b0\u7f13\u51b2\u6c60\u9875\u6570\u636e\u3002<\/p>\n<p>Redo Log Buffer\u4e2d\u7684\u6570\u636e\u4f1a\u6309\u7167\u4e00\u5b9a\u7684\u9891\u7387\u5199\u5230\u91cd\u505a\u65e5\u5fd7\u4e2d\u53bb\u3002\u88ab\u66f4\u6539\u8fc7\u7684\u9875\u5c31\u4f1a\u88ab\u6807\u8bb0\u6210\u810f\u9875\uff0cInnoDB\u4f1a\u6839\u636eCheckPoint\u673a\u5236\u6765\u5c06\u810f\u9875\u5237\u5230\u78c1\u76d8\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>\u65e5\u5fd7<\/strong><\/div>\n<p>\u4e0a\u9762\u63d0\u5230\u4e86Redo log\uff0c\u8fd9\u4e00\u5c0f\u8282\u5c31\u4e13\u95e8\u6765\u8bb2\u4e00\u8bb2\u65e5\u5fd7\uff0c\u65e5\u5fd7\u5206\u4e3a\u5982\u4e0b\u4e24\u4e2a\u7ef4\u5ea6\u3002<\/p>\n<p>MySQL\u5c42\u9762<\/p>\n<p>InnoDB\u5c42\u9762<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; color: white; background-color: black; border-left: red 10px solid; padding-left: 14px; margin-bottom: 20px; margin-top: 20px;\"><strong>MySQL\u65e5\u5fd7<\/strong><\/div>\n<p>MySQL\u7684\u65e5\u5fd7\u53ef\u4ee5\u5206\u4e3a\u9519\u8bef\u65e5\u5fd7\u3001\u4e8c\u8fdb\u5236\u6587\u4ef6\u3001\u67e5\u8be2\u65e5\u5fd7\u548c\u6ee1\u67e5\u8be2\u65e5\u5fd7\u3002<\/p>\n<p>\u9519\u8bef\u65e5\u5fd7 \u5f88\u597d\u7406\u89e3\uff0c\u5c31\u662f\u670d\u52a1\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u53d1\u751f\u7684\u4e25\u91cd\u9519\u8bef\u65e5\u5fd7\u3002\u5f53\u6211\u4eec\u7684\u6570\u636e\u5e93\u65e0\u6cd5\u542f\u52a8\u65f6\uff0c\u5c31\u53ef\u4ee5\u6765\u8fd9\u91cc\u770b\u770b\u5177\u4f53\u4e0d\u80fd\u542f\u52a8\u7684\u539f\u56e0\u662f\u4ec0\u4e48<br \/>\n\u4e8c\u8fdb\u5236\u6587\u4ef6 \u5b83\u6709\u53e6\u5916\u4e00\u4e2a\u540d\u5b57\u4f60\u5e94\u8be5\u719f\u6089\uff0c\u53ebBinlog\uff0c\u5176\u8bb0\u5f55\u4e86\u5bf9\u6570\u636e\u5e93\u6240\u6709\u7684\u66f4\u6539\u3002<br \/>\n\u67e5\u8be2\u65e5\u5fd7 \u8bb0\u5f55\u4e86\u6765\u81ea\u5ba2\u6237\u7aef\u7684\u6240\u6709\u8bed\u53e5<br \/>\n\u6162\u67e5\u8be2\u65e5\u5fd7 \u8fd9\u91cc\u8bb0\u5f55\u4e86\u6240\u6709\u54cd\u5e94\u65f6\u95f4\u8d85\u8fc7\u9608\u503c\u7684SQL\u8bed\u53e5\uff0c\u8fd9\u4e2a\u9608\u503c\u6211\u4eec\u53ef\u4ee5\u81ea\u5df1\u8bbe\u7f6e\uff0c\u53c2\u6570\u4e3along_query_time\uff0c\u5176\u9ed8\u8ba4\u503c\u4e3a10s\uff0c\u4e14\u9ed8\u8ba4\u662f\u5173\u95ed\u7684\u72b6\u6001\uff0c\u9700\u8981\u624b\u52a8\u7684\u6253\u5f00\u3002<\/p>\n<div   id="j6sjwn9j3u"    style=\"font-size: 14pt; 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