{"id":624,"date":"2009-08-13T09:55:51","date_gmt":"2009-08-13T01:55:51","guid":{"rendered":"http:\/\/orczhou.com\/?p=624"},"modified":"2010-04-14T11:39:08","modified_gmt":"2010-04-14T03:39:08","slug":"innodb-dirty-page-redo-log-2","status":"publish","type":"post","link":"https:\/\/www.orczhou.com\/index.php\/2009\/08\/innodb-dirty-page-redo-log-2\/","title":{"rendered":"InnoDB\u4e4bDirty page\u3001Redo log"},"content":{"rendered":"<p>\u5728InnoDB\u4e2d\uff0cbuffer pool\u91cc\u9762\u7684dirty page\u4e00\u65b9\u9762\u53ef\u4ee5\u52a0\u5feb\u6570\u636e\u5904\u7406\u901f\u5ea6\uff0c\u540c\u65f6\u4e5f\u4f1a\u9020\u6210\u6570\u636e\u7684\u4e0d\u4e00\u81f4(RAM vs DISK)\u3002\u672c\u6587\u4ecb\u7ecd\u4e86dirty page\u662f\u5982\u4f55\u4ea7\u751f\uff0c\u4ee5\u53caInnoDB\u5982\u4f55\u5229\u7528redo log\u5982\u4f55\u6d88\u9664dirty page\u4ea7\u751f\u7684\u6570\u636e\u4e0d\u4e00\u81f4\u3002<\/p>\n<ol>\n<li>\u5f53\u4e8b\u52a1(Transaction)\u9700\u8981\u4fee\u6539\u67d0\u6761\u8bb0\u5f55\uff08row\uff09\u65f6\uff0cInnoDB\u9700\u8981\u5c06\u8be5\u6570\u636e\u6240\u5728\u7684page\u4ecedisk\u8bfb\u5230buffer pool\u4e2d\uff0c\u4e8b\u52a1\u63d0\u4ea4\u540e\uff0cInnoDB\u4fee\u6539page\u4e2d\u7684\u8bb0\u5f55(row)\u3002\u8fd9\u65f6buffer pool\u4e2d\u7684page\u5c31\u5df2\u7ecf\u548cdisk\u4e2d\u7684\u4e0d\u4e00\u6837\u4e86\uff0c\u6211\u4eec\u79f0buffer pool\u4e2d\u7684page\u4e3adirty page\u3002Dirty page\u7b49\u5f85flush\u5230disk\u4e0a\u3002<br \/>\n<a title=\"dirty_pages by orczhou, on Flickr\" href=\"http:\/\/www.flickr.com\/photos\/26825745@N06\/3813766302\/\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/farm3.static.flickr.com\/2502\/3813766302_ba5659f61d_o.png\" alt=\"dirty_pages\" width=\"508\" height=\"387\" \/><\/a><br \/>\n<!--more--><\/li>\n<li>dirty page\u65e2\u7136\u662f\u5728Buffer pool\u4e2d\uff0c\u90a3\u4e48\u5982\u679c\u7cfb\u7edf\u7a81\u7136\u65ad\u7535Dirty page\u4e2d\u7684\u6570\u636e\u4fee\u6539\u662f\u5426\u4f1a\u4e22\u5931\uff1f\u8fd9\u4e2a\u62c5\u5fc3\u662f\u5f88\u6709\u5fc5\u8981\u7684\uff0c\u4f8b\u5982\u5982\u679c\u4e00\u4e2a\u7528\u6237\u5b8c\u6210\u4e00\u4e2a\u64cd\u4f5c\uff08\u6570\u636e\u5e93\u5b8c\u6210\u4e86\u4e00\u4e2a\u4e8b\u52a1\uff0cpage\u5df2\u7ecf\u5728buffer pool\u4e2d\u4fee\u6539\uff0c\u4f46dirty page\u5c1a\u672aflush\uff09\uff0c\u8fd9\u65f6\u7cfb\u7edf\u65ad\u7535\uff0cbuffer pool\u6570\u636e\u5168\u90e8\u6d88\u5931\u3002\u90a3\u4e48\uff0c\u8fd9\u4e2a\u7528\u6237\u5b8c\u6210\u7684\u64cd\u4f5c\uff08\u5bfc\u81f4\u7684\u6570\u636e\u5e93\u4fee\u6539\uff09\u662f\u5426\u4f1a\u4e22\u5931\u5462\uff1f\u7b54\u6848\u662f\u4e0d\u4f1a(innodb_flush_log_at_trx_commit=1)\u3002\u8fd9\u5c31\u662fredo log\u8981\u505a\u7684\u4e8b\u60c5\uff0c\u5728disk\u4e0a\u8bb0\u5f55\u66f4\u65b0\u3002<\/li>\n<li>redo log\u5728\u6bcf\u6b21\u4e8b\u52a1commit\u7684\u65f6\u5019\uff0c\u5c31\u7acb\u523b\u5c06\u4e8b\u52a1\u66f4\u6539\u64cd\u4f5c\u8bb0\u5f55\u5230redo log\u3002\u6240\u4ee5\u5373\u4f7fbuffer pool\u4e2d\u7684dirty page\u5728\u65ad\u7535\u65f6\u4e22\u5931\uff0cInnoDB\u5728\u542f\u52a8\u65f6\uff0c\u4ecd\u7136\u4f1a\u6839\u636eredo log\u4e2d\u7684\u8bb0\u5f55\u5b8c\u6210\u6570\u636e\u6062\u590d\u3002<\/li>\n<li>redo log\u7684\u53e6\u4e00\u4e2a\u4f5c\u7528\u662f\uff0c\u901a\u8fc7\u5ef6\u8fdfdirty page\u7684flush\u6700\u5c0f\u5316\u78c1\u76d8\u7684random writes\u3002\uff08redo log\u4f1a\u5408\u5e76\u4e00\u6bb5\u65f6\u95f4\u5185TRX\u5bf9\u67d0\u4e2apage\u7684\u4fee\u6539\uff09<br \/>\n<a title=\"dirty_pages AND redo_log by orczhou, on Flickr\" href=\"http:\/\/www.flickr.com\/photos\/26825745@N06\/3813218413\/\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/farm3.static.flickr.com\/2462\/3813218413_b21477573e_o.png\" alt=\"dirty_pages AND redo_log\" width=\"591\" height=\"452\" \/><\/a><\/li>\n<li><a title=\"dirty_pages_redo_log by orczhou, on Flickr\" href=\"http:\/\/www.flickr.com\/photos\/26825745@N06\/3813891252\/\"><\/a>\u6b63\u5e38\u60c5\u51b5\u4e0b\uff0cdirty page\u4ec0\u4e48\u65f6\u5019flush\u5230disk\u4e0a\uff1f<br \/>\n<span lang=\"EN-US\">1).<\/span>redo log\u662f\u4e00\u4e2a\u73af(ring)\u7ed3\u6784\uff0c\u5f53redo\u7a7a\u95f4\u5360\u6ee1\u65f6\uff0c\u5c06\u4f1a\u5c06\u90e8\u5206dirty page flush\u5230disk\u4e0a\uff0c\u7136\u540e\u91ca\u653e\u90e8\u5206redo log\u3002\u8fd9\u79cd\u60c5\u51b5\u53ef\u4ee5\u901a\u8fc7Innodb_log_wait(SHOW GLOBAL STATUS)\u89c2\u5bdf\uff0c\u60c5\u51b5\u53d1\u751f\u8be5\u8ba1\u6570\u5668\u4f1a\u81ea\u589e\u4e00\u6b21\u3002<br \/>\n2).\u5f53\u9700\u8981\u5728Buffer pool\u5206\u914d\u4e00\u4e2apage\uff0c\u4f46\u662f\u5df2\u7ecf\u6ee1\u4e86\uff0c\u5e76\u4e14\u6240\u6709\u7684page\u90fd\u662fdirty\u7684\uff08\u5426\u5219\u53ef\u4ee5\u91ca\u653e\u4e0ddirty\u7684page\uff09\uff0c\u901a\u5e38\u662f\u4e0d\u4f1a\u53d1\u751f\u7684\u3002\u8fd9\u65f6\u5019\u5fc5\u987bflush dirty pages to disk\u3002\u8fd9\u79cd\u60c5\u51b5\u5c06\u4f1a\u8bb0\u5f55\u5230Innodb_buffer_pool_wait_free\u4e2d\u3002\u4e00\u822c\u5730\uff0c\u53ef\u4ee5\u53ef\u4ee5\u901a\u8fc7\u542f\u52a8\u53c2\u6570innodb_max_dirty_pages_pct\u63a7\u5236\u8fd9\u79cd\u60c5\u51b5\uff0c\u5f53buffer pool\u4e2d\u7684dirty page\u5230\u8fbe\u8fd9\u4e2a\u6bd4\u4f8b\u7684\u65f6\u5019\uff0c\u5c06\u4f1a\u5f3a\u5236\u8bbe\u5b9a\u4e00\u4e2acheckpoint\uff0c\u5e76\u628adirty page flush\u5230disk\u4e2d\u3002<br \/>\n3).\u68c0\u6d4b\u5230\u7cfb\u7edf\u7a7a\u95f2\u7684\u65f6\u5019\uff0c\u4f1aflush\uff0c\u6bcf\u6b2164 pages\u3002<\/li>\n<li>\u6d89\u53ca\u7684InnoDB\u914d\u7f6e\u53c2\u6570\uff1ainnodb_flush_log_at_trx_commit\u3001innodb_max_dirty_pages_pct\uff1b\u72b6\u6001\u53c2\u6570\uff1aInnodb_log_wait\u3001Innodb_buffer_pool_wait_free\u3002<\/li>\n<\/ol>\n<p>\u53c2\u8003\u6587\u732e<\/p>\n<ol>\n<li><a href=\"http:\/\/mysqldump.azundris.com\/archives\/78-Configuring-InnoDB-An-InnoDB-tutorial.html\">http:\/\/mysqldump.azundris.com\/archives\/78-Configuring-InnoDB-An-InnoDB-tutorial.html<\/a><\/li>\n<li><a href=\"http:\/\/dev.mysql.com\/doc\/refman\/5.0\/en\/innodb.html\">http:\/\/dev.mysql.com\/doc\/refman\/5.0\/en\/innodb.html<\/a><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u5728InnoDB\u4e2d\uff0cbuffer pool\u91cc\u9762\u7684dirty page\u4e00\u65b9\u9762\u53ef\u4ee5\u52a0\u5feb\u6570\u636e\u5904\u7406\u901f\u5ea6\uff0c\u540c\u65f6\u4e5f\u4f1a\u9020\u6210\u6570\u636e\u7684\u4e0d\u4e00\u81f4(RAM vs DISK)\u3002\u672c\u6587\u4ecb\u7ecd\u4e86dirty page\u662f\u5982\u4f55\u4ea7\u751f\uff0c\u4ee5\u53caInnoDB\u5982\u4f55\u5229\u7528redo log\u5982\u4f55\u6d88\u9664dirty page\u4ea7\u751f\u7684\u6570\u636e\u4e0d\u4e00\u81f4\u3002 \u5f53\u4e8b\u52a1(Transaction)\u9700\u8981\u4fee\u6539\u67d0\u6761\u8bb0\u5f55\uff08row\uff09\u65f6\uff0cInnoDB\u9700\u8981\u5c06\u8be5\u6570\u636e\u6240\u5728\u7684page\u4ecedisk\u8bfb\u5230buffer pool\u4e2d\uff0c\u4e8b\u52a1\u63d0\u4ea4\u540e\uff0cInnoDB\u4fee\u6539page\u4e2d\u7684\u8bb0\u5f55(row)\u3002\u8fd9\u65f6buffer pool\u4e2d\u7684page\u5c31\u5df2\u7ecf\u548cdisk\u4e2d\u7684\u4e0d\u4e00\u6837\u4e86\uff0c\u6211\u4eec\u79f0buffer pool\u4e2d\u7684page\u4e3adirty page\u3002Dirty page\u7b49\u5f85flush\u5230disk\u4e0a\u3002<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","inline_featured_image":false,"_tocer_settings":[],"footnotes":""},"categories":[4],"tags":[19,120,20,45],"class_list":["post-624","post","type-post","status-publish","format-standard","hentry","category-code-detail","tag-dirty-page","tag-innodb","tag-redo-log","tag-45"],"_links":{"self":[{"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/posts\/624","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/comments?post=624"}],"version-history":[{"count":4,"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/posts\/624\/revisions"}],"predecessor-version":[{"id":1813,"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/posts\/624\/revisions\/1813"}],"wp:attachment":[{"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/media?parent=624"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/categories?post=624"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/tags?post=624"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}