{"id":2057,"date":"2020-07-29T23:29:20","date_gmt":"2020-07-29T15:29:20","guid":{"rendered":"http:\/\/39.97.231.10\/?p=2057"},"modified":"2020-07-29T23:29:20","modified_gmt":"2020-07-29T15:29:20","slug":"mysql%e5%8f%82%e6%95%b0%e8%a7%a3%e6%9e%90innodb_max_dirty_pages_pct_lwm","status":"publish","type":"post","link":"http:\/\/www.weijing.co\/?p=2057","title":{"rendered":"MySQL\u53c2\u6570\u89e3\u6790innodb_max_dirty_pages_pct_lwm"},"content":{"rendered":"<div class=\\\"blog_content\\\">\n<div class=\\\"blog_detail\\\">\n<div>\ninnodb_max_dirty_pages_pct_lwm \u53c2\u6570\u5b9a\u4e49\u4e86\u4e00\u4e2a\u4ee3\u8868\u810f\u9875\u6bd4\u4f8b\u7684\u4f4e\u6c34\u4f4d\u7ebf\uff0c\u5f53buffer pool\u91cc\u9762\u7684\u810f\u9875\u6bd4\u4f8b\u8d85\u8fc7\u8fd9\u4e2a\u4f4e\u6c34\u4f4d\u7ebf\u65f6\uff0c\u80fd\u591f\u89e6\u53d1\u810f\u9875\u9884\u5237\u529f\u80fd\uff0c\u6765\u9010\u6b65\u63a7\u5236\u810f\u9875\u6bd4\u4f8b\u3002<br \/>\ninnodb_max_dirty_pages_pct_lwm \u662f\u4e00\u4e2a\u53ef\u52a8\u6001\u4fee\u6539\u7684\u53c2\u6570\uff0c\u53d6\u503c\u8303\u56f4\u4e3a0\u523099.99\uff0c\u9ed8\u8ba4\u503c\u4e3a0\uff0c\u5f53\u8bbe\u7f6e\u4e3a0\u65f6\uff0c\u8868\u793a\u7981\u7528\u4f4e\u6c34\u4f4d\u9884\u5237\u810f\u9875\u529f\u80fd\u3002<br \/>\ninnodb_max_dirty_pages_pct_lwm \u503c\u53ea\u80fd\u5c0f\u4e8e\u7b49\u4e8einnodb_max_dirty_pages_pct \u503c\uff0c\u5982\u679c\u8bbe\u7f6e\u7684\u503c\u5927\u4e8einnodb_max_dirty_pages_pct\u503c\uff0c\u5219\u4f1a\u88ab\u5f3a\u5236\u4fee\u6539\u4e3a\u4e0einnodb_max_dirty_pages_pct\u503c\u76f8\u7b49\u3002<\/p>\n<h5>innodb_max_dirty_pages_pct_lwm\u53c2\u6570\u6e90\u7801\u89e3\u6790<\/h5>\n<p><strong>\u6e90\u7801\u7248\u672c\uff1a5.7.19<\/strong><br \/>\n\u5728\u6e90\u7801\u4e2d\uff0cinnodb_max_dirty_pages_pct_lwm\u53c2\u6570\u5bf9\u5e94\u7684\u53d8\u91cf\u662fsrv_max_dirty_pages_pct_lwm\uff0c\u5b83\u662f\u4e00\u4e2a\u5168\u5c40\u53d8\u91cf\uff0c\u9ed8\u8ba4\u503c\u4e3a0.0\uff0c\u5982\u4e0b\uff1a<br \/>\ndouble\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0srv_max_dirty_pages_pct_lwm\u00a0\u00a0\u00a0= 0.0;<br \/>\n\u4f7f\u7528srv_max_dirty_pages_pct_lwm\u53d8\u91cf\u7684\u4ee3\u7801\u4e3b\u8981\u96c6\u4e2d\u5728\u51fd\u6570af_get_pct_for_dirty()\uff0c\u8fd9\u4e2a\u51fd\u6570\u903b\u8f91\u5f88\u7b80\u5355\uff0c\u8fd4\u56de\u4e00\u4e2a\u6574\u6570\u503c\uff0c\u7528\u4e8e\u63a7\u5236\u5237\u810f\u9875\u7684\u6570\u91cf\uff0c\u8fd9\u4e2a\u503c\u8fd4\u56de\u7ed9\u4e0a\u5c42\u8c03\u7528\u51fd\u6570\uff0c\u7ed3\u5408io_capacity\u548cmax_io_capacity\u53c2\u6570\uff0c\u8ba1\u7b97\u51fa\u8981\u5237\u7684\u9875\u9762\u6570\u91cf\u3002af_get_pct_for_dirty()\u51fd\u6570\u7684\u4e3b\u8981\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre><code>static ulint af_get_pct_for_dirty()\n{\n\tdouble\tdirty_pct = buf_get_modified_ratio_pct();\n\tif (dirty_pct == 0.0) {\n\t\treturn(0);\n\t}\n\tif (srv_max_dirty_pages_pct_lwm == 0) {\n\t\tif (dirty_pct &gt;= srv_max_buf_pool_modified_pct) {\n\t\t\treturn(100);\n\t\t}\n\t} else if (dirty_pct &gt;= srv_max_dirty_pages_pct_lwm) {\n\t\treturn(static_cast&lt;ulint&gt;((dirty_pct * 100) \/ (srv_max_buf_pool_modified_pct + 1)));\n\t}\n\treturn(0);\n}\n<\/code><\/pre>\n<p>\u4e0a\u8ff0\u4ee3\u7801\u903b\u8f91\u5e76\u4e0d\u590d\u6742\uff0c\u7b80\u5355\u6982\u8ff0\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>\u5f53srv_max_dirty_pages_pct_lwm\u4e3a0\u65f6\uff0c\u662f\u5426\u5237\u810f\u9875\uff0c\u53ea\u4e0esrv_max_buf_pool_modified_pct\u53c2\u6570\u6709\u5173\uff0c\u5f53\u810f\u9875\u6bd4\u4f8b\u8d85\u8fc7\u8fd9\u4e2a\u9608\u503c\u65f6\uff0c\u5f00\u59cb\u6309io_capacity\u80fd\u529b\u7684100%\u8fdb\u884c\u5237\u810f\u9875\u3002<\/li>\n<li>\u5f53srv_max_dirty_pages_pct_lwm\u4e0d\u4e3a0\u65f6\uff0c\u810f\u9875\u6bd4\u4f8b\u8d85\u8fc7srv_max_dirty_pages_pct_lwm\u8fd9\u4e2a\u4f4e\u6c34\u4f4d\u7ebf\u65f6\uff0c\u624d\u5f00\u59cb\u9010\u6b65\u5730\u5237\u810f\u9875\uff0c\u810f\u9875\u6bd4\u4f8b\u8d8a\u9ad8\uff0c\u5237\u810f\u9875\u7684\u5f3a\u5ea6\u8d8a\u9ad8\u3002<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>innodb_max_dirty_pages_pct_lwm \u53c2\u6570\u5b9a\u4e49\u4e86\u4e00\u4e2a\u4ee3\u8868\u810f\u9875\u6bd4\u4f8b\u7684\u4f4e\u6c34\u4f4d\u7ebf\uff0c\u5f53buff &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"http:\/\/www.weijing.co\/?p=2057\"> <span class=\"screen-reader-text\">MySQL\u53c2\u6570\u89e3\u6790innodb_max_dirty_pages_pct_lwm<\/span> \u67e5\u770b\u5168\u6587 &raquo;<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"categories":[90,88],"tags":[],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"mailpoet_newsletter_max":false,"woocommerce_thumbnail":false,"woocommerce_single":false,"woocommerce_gallery_thumbnail":false,"shop_catalog":false,"shop_single":false,"shop_thumbnail":false},"uagb_author_info":{"display_name":"weijing","author_link":"http:\/\/www.weijing.co\/?author=4"},"uagb_comment_info":0,"uagb_excerpt":"innodb_max_dirty_pages_pct_lwm \u53c2\u6570\u5b9a\u4e49\u4e86\u4e00\u4e2a\u4ee3\u8868\u810f\u9875\u6bd4\u4f8b\u7684\u4f4e\u6c34\u4f4d\u7ebf\uff0c\u5f53buff&hellip;","_links":{"self":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/2057"}],"collection":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2057"}],"version-history":[{"count":0,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/2057\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2057"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2057"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2057"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}