{"id":4234,"date":"2019-05-12T19:32:15","date_gmt":"2019-05-12T11:32:15","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=4234"},"modified":"2019-05-12T19:32:15","modified_gmt":"2019-05-12T11:32:15","slug":"%e4%b8%80%e5%a4%ab%e5%bd%93%e5%85%b3%e4%b8%87%e5%a4%ab%e8%8e%ab%e5%bc%80%ef%bc%8cmysql%e5%85%a8%e5%b1%80%e9%94%81ftwrl%e7%9c%9f%e9%a6%99","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=4234","title":{"rendered":"\u4e00\u592b\u5f53\u5173\u4e07\u592b\u83ab\u5f00\uff0cMySQL\u5168\u5c40\u9501(FTWRL)\u771f\u9999"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u8fd9\u662f\u4e00\u628a\u597d\u9501\uff0c\u771f\u9999\uff01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MySQL \u5168\u5c40\u9501\uff0c\u542c\u5230\u7684\u4eba\u53ef\u80fd\u771f\u6ca1\u591a\u5c11\u3002\u4e00\u65b9\u9762\u662f\u4e00\u4e9b\u4eba\u8ba4\u4e3a DBA \u624d\u9700\u8981\u6df1\u5165\u5427\uff0c\u53e6\u4e00\u65b9\u9762\u591a\u6570\u4eba\u63a5\u89e6\u4e0d\u5230\u8fd9\u4e48\u6df1\u7684\u77e5\u8bc6\u3002\u8fd8\u6709\u4e00\u65b9\u9762\u53ef\u80fd\u5c31\u771f\u5982\u5927\u5bb6\u6240\u8bf4\u7684\u201c\u6ca1\u6709\u65f6\u95f4\u5b66\u4e60\u201d\uff01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6628\u5929\u90a3\u7bc7\u6587\u7ae0\uff0c\u6211\u63d0\u5230\u4e86\u4e00\u4e2a\u6570\u636e\u8fc1\u79fb\u3002\u6211\u4eec\u6765\u770b\u4e00\u4e2a\u573a\u666f\uff0c\u73b0\u5728\u6211\u4e3a\u4e86\u7f29\u5c0f\u56e0\u5220\u9664\u7b49\u9020\u6210\u7684 MySQL \u5360\u7528\u7a7a\u95f4\u5c45\u9ad8\u4e0d\u4e0b\uff0c\u6211\u9700\u8981\u8fdb\u884c\u6570\u636e\u8fc1\u79fb\u3002\u4f46\u662f\u5728\u6570\u636e\u8fc1\u79fb\u4e4b\u95f4\uff0c\u5982\u679c\u8fd8\u6709\u6570\u636e\u88ab\u5199\u5165\u6570\u636e\u5e93\u4e86\u3002\u5982\u4f55\u4fdd\u8bc1\u6211\u8fc1\u79fb\u7684\u5c31\u662f\u5168\u91cf\u6570\u636e\uff0c\u4e00\u6761\u4e5f\u4e0d\u5c11\u5462\uff1f<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=http:\/\/ww1.sinaimg.cn\/large\/8fa5dcfcly1g2yrde9oroj20ek0cot9f.jpg\" alt=\"\" \/><figcaption>Flush tables with read lock<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u4e3a\u6211\u4e00\u8fb9\u8bfb\uff0c\u4e00\u8fb9\u6709\u6570\u636e\u5199\u5165\u3002\u6bd4\u5982\u4e00\u4e2a\u8868\uff0c\u6211\u5df2\u7ecf\u590d\u5236\u5b8c\u4e86\uff0c\u4f60\u53c8\u65b0\u589e\u6570\u636e\u4e86\u600e\u4e48\u641e\uff1f\u8fd9\u65f6\u6700\u7b80\u5355\u7684\u529e\u6cd5\u5c31\u662f\u4f7f\u7528\u5168\u5c40\u9501\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5168\u5c40\u9501\u4f60\u4e5f\u53ef\u4ee5\u7406\u89e3\u4e3a\u6570\u636e\u5e93\u7ea7\u522b\u7684\u9501\u3002\u4e5f\u5c31\u662f\u9501\uff0c\u8fd9\u628a\u9501\u4f1a\u52a0\u7ed9\u6574\u4e2a\u6570\u636e\u5e93\u3002\u5bf9\u4e8e\u4e0a\u9762\u7684\u573a\u666f\uff0c\u6211\u4eec\u5176\u5b9e\u662f\u53ef\u4ee5\u52a0\u4e86\u5168\u5c40\u8bfb\u9501\u3002\u4e00\u6761\u547d\u4ee4\u5c31\u641e\u5b9a\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Flush tables with read lock;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Flush tables with read lock \u4e5f\u88ab\u7b80\u79f0\u4e3a FTWRL\u3002\u6267\u884c\u8fd9\u4e2a\u8bed\u53e5\uff0c\u5b83\u4f1a\u8ba9\u6574\u4e2a\u5e93\u88ab\u5904\u4e8e\u53ea\u8bfb\u72b6\u6001\u3002\u4e4b\u540e\u7684\u589e\u5220\u6539\u8bed\u53e5\u5c31\u4f1a\u88ab\u963b\u585e\uff0c\u5305\u62ec\u4e8b\u52a1\u7684\u63d0\u4ea4\uff0c\u8868\u7ed3\u6784\u7684\u4fee\u6539\u4e0e\u521b\u5efa\u7b49\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5904\u4e8e\u53ea\u8bfb\u72b6\u6001\u7684\u6570\u636e\u5e93\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u5c3d\u60c5\u7684\u53bb\u590d\u5236\u4e86\u3002\u56e0\u4e3a\u8fd9\u65f6\u4f60\u590d\u5236\u7684\u5c31\u662f\u6574\u4e2a\u5e93\uff0c\u5168\u91cf\u6570\u636e\u3002\u6240\u4ee5\u8fd9\u628a\u9501\u4e00\u592b\u5f53\u5173\u4e07\u592b\u83ab\u5f00\uff0c\u771f\u9999\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=http:\/\/ww1.sinaimg.cn\/large\/8fa5dcfcly1g2yrff0kg8j208w04rgli.jpg\" alt=\"\" \/><figcaption>MySQL\u5168\u5c40\u9501<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u522b\u4ee5\u4e3a\uff0c\u8fd9\u628a\u9501\u529b\u5ea6\u592a\u5927\uff0c\u6ca1\u4ec0\u4e48\u5375\u7528\u3002\u5176\u5b9e\u771f\u5b9e\u5f00\u53d1\u5de5\u4f5c\u4e2d\uff0c\u6709\u65f6\u5019\u5b83\u80fd\u5e2e\u4f60\u89e3\u51b3\u6389\u4e0d\u5c11\u9ebb\u70e6\u3002\u6b63\u6240\u8c13\u5b58\u5728\u5373\u5408\u7406\uff01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FTWRL \u8fd9\u4e2a\u547d\u4ee4\u4e3b\u8981\u7528\u4e8e\u5907\u4efd\u5de5\u5177\u83b7\u53d6\u4e00\u81f4\u6027\u5907\u4efd(\u6570\u636e\u4e0ebinlog\u4f4d\u70b9\u5339\u914d)\u3002\u7531\u4e8e FTWRL \u603b\u5171\u9700\u8981\u6301\u6709\u4e24\u628a\u5168\u5c40\u7684 MDL \u9501\uff08\u540e\u9762\u5199\u6587\u7ae0\u8bb2\uff09\uff0c\u5e76\u4e14\u8fd8\u9700\u8981\u5173\u95ed\u6240\u6709\u8868\u5bf9\u8c61\uff0c\u56e0\u6b64\u8fd9\u4e2a\u547d\u4ee4\u7684\u6740\u4f24\u6027\u5f88\u5927\uff0c\u6267\u884c\u547d\u4ee4\u65f6\u5bb9\u6613\u5bfc\u81f4\u5e93 hang \u4f4f\u3002\u5982\u679c\u662f\u4e3b\u5e93\uff0c\u5219\u4e1a\u52a1\u65e0\u6cd5\u6b63\u5e38\u8bbf\u95ee\uff1b\u5982\u679c\u662f\u5907\u5e93\uff0c\u5219\u4f1a\u5bfc\u81f4 SQL \u7ebf\u7a0b\u5361\u4f4f\uff0c\u4e3b\u5907\u5ef6\u8fdf\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6570\u636e\u7684\u4e00\u81f4\u6027\u6709\u591a\u91cd\u8981\uff0c\u6211\u5c31\u4e0d\u591a\u8bf4\u4e86\u3002\u6700\u5e38\u89c1\u7684\u5c31\u662f\u4f60\u5728\u904d\u5386\u4e00\u4e2a Java \u96c6\u5408\u65f6\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0 ConcurrentModificationException \u95ee\u9898\u3002\u4e5f\u5c31\u662f\u5e76\u53d1\u4fee\u6539\u5f02\u5e38\u3002\u8fd9\u4e2a\u77e5\u8bc6\u70b9\uff0c\u6211\u4e0b\u7bc7\u6587\u7ae0\u6765\u5199\u3002\u8fd9\u91cc\u539f\u8c05\u6211\u5148\u9884\u544a\u4e00\u4e0b\uff01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FTWRL \u8fd9\u4e48\u725b\uff0c\u80cc\u540e\u5230\u5e95\u505a\u4e86\u54ea\u4e9b\u4e8b\u60c5\uff1f\u5b83\u4e3b\u8981\u5e72 3 \u4ef6\u4e8b\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u4e0a\u5168\u5c40\u8bfb\u9501(lock_global_read_lock)\uff1b<\/li><li>\u6e05\u7406\u8868\u7f13\u5b58(close_cached_tables)\uff1b<\/li><li>\u4e0a\u5168\u5c40COMMIT\u9501(make_global_read_lock_block_commit)\u3002 <\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u5168\u5c40\u8bfb\u9501\u4f1a\u5bfc\u81f4\u6240\u6709\u66f4\u65b0\u64cd\u4f5c\u90fd\u4f1a\u88ab\u5835\u585e\uff1b\u5173\u95ed\u8868\u8fc7\u7a0b\u4e2d\uff0c\u5982\u679c\u6709\u5927\u67e5\u8be2\u5bfc\u81f4\u5173\u95ed\u8868\u7b49\u5f85\uff0c\u90a3\u4e48\u6240\u6709\u8bbf\u95ee\u8fd9\u4e2a\u8868\u7684\u67e5\u8be2\u548c\u66f4\u65b0\u90fd\u9700\u8981\u7b49\u5f85\uff1b\u6e05\u7406\u8868\u7f13\u5b58\u4e5f\u5c31\u662f\u6bcf\u4e2a\u8868\u5728\u5185\u5b58\u4e2d\u90fd\u6709\u4e00\u4e2a table_cache\uff0c\u4e0d\u540c\u8868\u7684 cache \u5bf9\u8c61\u901a\u8fc7 hash \u94fe\u8868\u7ef4\u62a4\uff0c\u5237\u65b0\u5b83\u81ea\u5df1\u7684 data\uff0c\u540c\u65f6\u4e5f\u5237\u65b0\u64cd\u4f5c\u7cfb\u7edf\u7684 data \u5230 disk \u4e0a\uff1b\u4e0a\u5168\u5c40 COMMIT \u9501\u65f6\uff0c\u4f1a\u5835\u585e\u6d3b\u8dc3\u4e8b\u52a1\u63d0\u4ea4\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u5168\u5c40\u8bfb\u9501\u548c\u4e0a\u5168\u5c40 COMMIT \u9501\u90fd\u662f\u901a\u8fc7 MDL \u9501\u5b9e\u73b0\u7684\u3002\u8fd9\u4e2a MDL \u9501 MySQL \u5e95\u5c42\u7528\u5230\u7684\u6bd4\u8f83\u591a\u3002\u540e\u9762\u6709\u6587\u7ae0\u6765\u91cd\u70b9\u5199\u3002\u9664\u4e86\u672c\u6587\u4ecb\u7ecd\u7684\u9501\uff0cMySQL \u8fd8\u6709\u8868\u9501\uff0c\u884c\u7ea7\u9501\u7b49\u5404\u79cd\u9501\uff0c\u6211\u540e\u9762\u4f1a\u62bd\u65f6\u95f4\u6765\u4e00\u4e00\u4e66\u5199\uff0c\u611f\u5174\u8da3\u7684\u53ef\u4ee5\u957f\u671f\u7684\u5173\u6ce8\uff01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u540e\u5728\u8bf4\u4e00\u70b9\uff0c\u5f53\u6211\u4eec\u6267\u884c\u8fd9\u4e2a\u8bed\u53e5\u540e\uff0c\u5982\u4f55\u91ca\u653e\u9501\u5462\uff1f\u4e5f\u5c31\u662f\u53d6\u6d88\u8fd9\u4e2a\u9501\u3002\u4e5f\u5f88\u7b80\u5355\uff0c\u4e0b\u9762\u7684\u4e00\u6761\u8bed\u53e5\u5373\u53ef\u641e\u5b9a\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>unlock tables<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0a\uff0c\u5e0c\u671b\u80fd\u591f\u5e2e\u52a9\u5230\u5927\u5bb6\uff01<\/p>\n<!-- <audio autoplay=\"autoplay\" height=\"100\" width=\"100\" hidden=\"true\"><source src=\"https:\/\/c.coka.la\/orAvPR.mp3\" type=\"audio\/mp3\"\/><\/audio><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/ws3.sinaimg.cn\/large\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/> --><p><!-- <img decoding=\"async\" src=\"https:\/\/raw.githubusercontent.com\/xmt1139057136\/xttblog\/master\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/>--><img decoding=\"async\" src=\"https:\/\/saas.51autoparts.cn\/api\/admin\/sys-file\/oss\/file?fileName=84db51f8561e448f9a4fda2eff0811f9.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/><\/p><p>\u6700\u540e\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u4e2a\u4eba\u5fae\u4fe1\u516c\u4f17\u53f7\uff1a\u4e1a\u4f59\u8349\uff08yyucao\uff09\uff01<b>\u53ef\u52a0\u4f5c\u8005\u5fae\u4fe1\u53f7\uff1a<font color=\"red\">xttblog2<\/font>\u3002\u5907\u6ce8\uff1a\u201c1\u201d\uff0c\u6dfb\u52a0\u535a\u4e3b\u5fae\u4fe1\u62c9\u4f60\u8fdb\u5fae\u4fe1\u7fa4\u3002\u5907\u6ce8\u9519\u8bef\u4e0d\u4f1a\u540c\u610f\u597d\u53cb\u7533\u8bf7\u3002<\/b>\u518d\u6b21\u611f\u8c22\u60a8\u7684\u5173\u6ce8\uff01\u540e\u7eed\u6709\u7cbe\u5f69\u5185\u5bb9\u4f1a\u7b2c\u4e00\u65f6\u95f4\u53d1\u7ed9\u60a8\uff01\u539f\u521b\u6587\u7ae0\u6295\u7a3f\u8bf7\u53d1\u9001\u81f3532009913@qq.com\u90ae\u7bb1\u3002\u5546\u52a1\u5408\u4f5c\u4e5f\u53ef\u6dfb\u52a0\u4f5c\u8005\u5fae\u4fe1\u8fdb\u884c\u8054\u7cfb\uff01<\/p><p>\u672c\u6587\u539f\u6587\u51fa\u5904\uff1a<a href=\"https:\/\/www.xttblog.com\">\u4e1a\u4f59\u8349<\/a>\uff1a &raquo; <a href=\"https:\/\/www.xttblog.com\/?p=4234\">\u4e00\u592b\u5f53\u5173\u4e07\u592b\u83ab\u5f00\uff0cMySQL\u5168\u5c40\u9501(FTWRL)\u771f\u9999<\/a><\/p><!-- <div class=\"bd-reward-stl\"><button id=\"bdRewardBtn\"><span><\/span><\/button><\/div> -->","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u662f\u4e00\u628a\u597d\u9501\uff0c\u771f\u9999\uff01 MySQL \u5168\u5c40\u9501\uff0c\u542c\u5230\u7684\u4eba\u53ef\u80fd\u771f\u6ca1\u591a\u5c11\u3002\u4e00\u65b9\u9762\u662f\u4e00\u4e9b\u4eba\u8ba4\u4e3a DBA \u624d\u9700\u8981\u6df1\u5165\u5427\uff0c\u53e6\u4e00 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[83,622,202,1681,1682],"class_list":["post-4234","post","type-post","status-publish","format-standard","hentry","category-sql","tag-mysql","tag-stampedlock","tag-locked","tag-record-locks","tag-gap-locks"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4234","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4234"}],"version-history":[{"count":1,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4234\/revisions"}],"predecessor-version":[{"id":4235,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4234\/revisions\/4235"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4234"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4234"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4234"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}