{"id":4242,"date":"2019-05-14T18:53:00","date_gmt":"2019-05-14T10:53:00","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=4242"},"modified":"2019-05-14T18:53:00","modified_gmt":"2019-05-14T10:53:00","slug":"%e4%b8%80%e4%b8%aasql%e8%ae%a9%e5%af%bc%e8%87%b4%e6%95%b4%e4%b8%aa%e6%95%b0%e6%8d%ae%e5%ba%93%e9%83%bd%e6%95%b4%e6%8c%82%e4%ba%86","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=4242","title":{"rendered":"\u4e00\u4e2aSQL\u8ba9\u5bfc\u81f4\u6574\u4e2a\u6570\u636e\u5e93\u90fd\u6574\u6302\u4e86"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u5728\u6211\u4eec\u7684\u7535\u5546\u7cfb\u7edf\u4e2d\uff0c\u9700\u6c42\u975e\u5e38\u591a\uff0c\u6c38\u8fdc\u505a\u4e0d\u5b8c\u3002\u540c\u65f6\u4e00\u4e9b\u4e5f\u7ecf\u5e38\u9762\u4e34\u4e00\u4e9b\u6280\u672f\u65b9\u9762\u7684\u95ee\u9898\uff0c\u6bd4\u5982\uff0c\u8fd9\u6b21\u4e00\u6761 SQL \u8bed\u53e5\u8ba9\u6574\u4e2a\u6570\u636e\u5e93\u90fd\u6302\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7531\u4e8e\u6700\u8fd1\u4e1a\u7ee9\u7206\u53d1\uff0c\u7cfb\u7edf\u4e2d\u67d0\u5f20\u8868\u7531\u4e8e\u8bbe\u8ba1\u4e0d\u592a\u5408\u7406\uff0c\u5bfc\u81f4\u4ea7\u751f\u4e86\u5927\u91cf\u7684\u5197\u4f59\u6570\u636e\u3002\u4e8e\u662f\uff0c\u7ecf\u8fc7\u4e00\u756a\u8ba8\u8bba\u540e\uff0c\u6211\u4eec\u60f3\u628a\u5197\u4f59\u6570\u636e\u8fc1\u51fa\u4e00\u90e8\u5206\u3002\u8fd9\u548c\u6211\u4eec\u524d\u9762\u8bb2\u7684\u6709\u70b9\u4e0d\u592a\u4e00\u6837\u4e86\u3002\u524d\u9762\u6211\u4eec\u662f\u6574\u5e93\u8fc1\u79fb\uff0c\u73b0\u5728\u662f\u9488\u5bf9\u5355\u8868\u8fc1\u79fb\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcgy1g311ipfpwnj20aw09ljs5.jpg\" alt=\"\" \/><figcaption>\u53c8\u7ffb\u8f66\u4e86<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u9488\u5bf9\u5355\u8868\u53ea\u8bfb\uff0c\u6211\u4eec\u4f7f\u7528\u4e86\u8868\u9501\u7684\u8bed\u6cd5 lock tables \u2026 read\/writ\u2026\u3002\u5177\u4f53\u7528\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>lock tables xttblog read;\n-- lock tables xttblog2 write;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528\u4e0a\u9762\u7684\u8bed\u53e5\u540e\uff0c\u5728\u6211\u4eec\u64cd\u4f5c\u5b8c\u6210\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7 unlock tables \u8fdb\u884c\u89e3\u9501\u6216\u8005\uff0c\u4e5f\u53ef\u4ee5\u5728\u5ba2\u6237\u7aef\u65ad\u5f00\u7684\u65f6\u5019\u81ea\u52a8\u91ca\u653e\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>unlock tables;\nshow open TABLES from test;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528 lock tables xttblog read\uff0cwrit xttblog2 \u8bed\u6cd5\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5219\u5f53\u524d\u4f1a\u8bdd\u53ea\u80fd\u5bf9 xttblog \u8868 read ,\u4e0d\u80fd write\u3002\u5176\u4ed6\u4f1a\u8bdd\u4e0d\u80fd\u5199 xttblog \u8868\uff0c\u8bfb\u5199 xttblog2 \u8868\u3002\u5f53\u524d\u4f1a\u8bdd\u5bf9\u5176\u5b83\u8868\u4e0d\u80fd read\uff0cwrite\uff0c\u5e76\u4e14\u5728\u89e3\u9501\u4e4b\u524d\uff0c\u5f53\u524d\u4f1a\u8bdd\u4e5f\u53ea\u80fd\u8bfb xttblog\uff0c\u8bfb\u5199 xttblog2\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e48 BT \u7684\u9650\u5236\uff0c\u5bfc\u81f4\u4e86\u4e00\u4e2a\u6b63\u5728\u6267\u884c\u7684\u4e8b\u52a1\u88ab\u963b\u585e\u4e86\u3002\u5149\u963b\u585e\u4e5f\u8fd8\u7b97\u597d\uff0c\u56e0\u4e3a\u4e8b\u52a1\u4f1a\u6709\u8d85\u65f6\u673a\u5236\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f46\u662f\u7ebf\u7a0b\u6c60\u914d\u7f6e\u7684\u6709\u4e00\u4e2a\u5927 Bug\uff0c\u8d85\u65f6\u4e4b\u540e\u4f1a\u8fdb\u884c\u91cd\u8bd5\u3002\u5f53\u524d\u8868\u9501\u4f4f\uff0c\u9650\u5236\u53ea\u8bfb\u4e4b\u540e\uff0c\u589e\u5220\u6539\u8bf7\u6c42\u90fd\u88ab\u963b\u585e\u4e86\u3002\u4e8e\u662f\u4e0d\u505c\u7684\u6709\u7ebf\u7a0b\u88ab\u963b\u585e\uff0c\u7136\u540e\u8fd8\u6709\u91cd\u8bd5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u672c\u6765\u8fd9\u5f20\u8868\u8bbe\u8ba1\u7684\u5197\u4f59\u6570\u636e\u5c31\u6bd4\u8f83\u591a\uff0c\u64cd\u4f5c\u6bd4\u8f83\u9891\u7e41\u3002\u73b0\u5728\u597d\u4e86\uff0c\u5927\u91cf\u7684\u7ebf\u7a0b\u88ab\u963b\u585e\u4e86\u3002\u4e8e\u662f\u6574\u4e2a\u751f\u4ea7\u5e93\u968f\u4e4b\u6302\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\uff0c\u6709\u65f6\u5019\u6709 DBA \u662f\u4e00\u79cd\u83ab\u5927\u7684\u5e78\u798f\u554a\u3002\u5207\u8bb0\u5728\u4e1a\u52a1\u9ad8\u5cf0\u65f6\u671f\u5bf9\u751f\u4ea7\u5e93\u8fdb\u884c\u64cd\u4f5c\uff0c\u591c\u6df1\u4eba\u9759\u624d\u662f\u8fdb\u884c\u6570\u636e\u8fdb\u884c\u8fc1\u79fb\u7684\u65f6\u5019\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd8\u6709\uff0c\u9047\u5230\u8fd9\u7c7b\u95ee\u9898\uff0c\u5148\u4fee\u6539\u4e1a\u52a1\u4ee3\u7801\u3002\u4ece\u6e90\u5934\u63a7\u5236\uff0c\u522b\u5149\u4e00\u76f4\u60f3\u7740\u8fdb\u884c\u6570\u636e\u8fc1\u79fb\u3002\u91cd\u8bd5\u8fd9\u79cd\u673a\u5236\u6709\u597d\u5904\u4e5f\u6709\u5bb3\u5904\uff0c\u4f7f\u7528\u8981\u5408\u7406\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u540e\uff0c\u7ed3\u5408\u524d\u9762\u7684\u6587\u7ae0\u603b\u7ed3\u4e00\u4e0b\uff0c\u5168\u5c40\u9501 Flush tables with read lock\uff08FTWRL\uff09 \u4e0e lock table  table_name read\/write \u9501\u7684\u533a\u522b\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Flush tables with read lock: \u5168\u5c40\u8bfb\u9501\uff0c\u89e3\u9501\uff1aunlock tables \u3002<\/li><li>lock table  table_name read\/write :\u6307\u5b9a\u8868\u9501\uff0c\u89e3\u9501\uff1aunlock table table_name \/unlock tables table_names \u6bcf\u6b21\u53ea\u80fd\u6301\u4e00\u4e2a\u9501\u3002<\/li><li>lock tables table read :\u6ca1\u6709\u4f1a\u8bdd\u80fd DML read-locked \u8868\u3002<\/li><li>lock tables table_name write : \u9664\u4e86\u6301\u6709\u9501\u4f1a\u8bdd\uff0c\u6ca1\u6709\u4f1a\u8bdd\u80fd\u8bbf\u95ee write-locked \u8868\u3002<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u4e2a session \u53ea\u80fd\u4e3a\u81ea\u5df1\u83b7\u53d6\u9501\u548c\u91ca\u653e\u9501\uff0c\u4e0d\u80fd\u4e3a\u5176\u4ed6 session \u83b7\u53d6\u9501\uff0c\u4e5f\u4e0d\u80fd\u91ca\u653e\u7531\u5176\u4ed6 session \u4fdd\u6301\u7684\u9501\u3002\u4fdd\u6301\u8be5\u9501\u7684 session \u53ef\u4ee5\u8bfb\u53d6\u52a0\u9501\u7684\u8868\uff0c\u4f46\u4e0d\u80fd\u5199\uff0c\u5bf9\u4e8e\u6ca1\u6709\u52a0\u9501\u7684\u8868\u4e0d\u80fd\u8bfb\u4e5f\u4e0d\u80fd\u5199\u3002\u591a\u4e2a session \u53ef\u540c\u65f6\u4e3a\u540c\u4e00\u4e2a\u8868\u83b7\u53d6 READ \u9501\u3002\u5f53\u524d session \u53ea\u80fd\u8bfb\u53d6\u660e\u786e\u83b7\u53d6\u4e86 READ \u9501\u7684\u8868\uff0c\u4e0d\u80fd\u66f4\u65b0\u8be5\u8868\uff0c\u4e5f\u4e0d\u80fd\u8bfb\u53d6\u548c\u66f4\u65b0\u5176\u4ed6\u6ca1\u6709\u83b7\u53d6 READ \u9501\u7684\u8868\u3002\u5176\u4ed6\u7684 session \u53ef\u4ee5\u8bfb\u53d6\u6ca1\u6709\u5728\u5f53\u524d session \u4e2d\u660e\u786e\u83b7\u53d6 READ \u9501\u7684\u8868\uff0c\u5f53\u7136\u4e5f\u53ef\u4ee5\u8bfb\u53d6\u83b7\u53d6\u4e86 READ \u9501\u7684\u8868\u3002\u4f46\u662f\u66f4\u65b0\u5728\u5176\u4ed6 session \u4e2d\u83b7\u53d6\u4e86 READ \u9501\u7684\u8868\u4f1a\u88ab\u963b\u585e\uff0c\u53ef\u4ee5\u6b63\u5e38\u66f4\u65b0\u5176\u4ed6\u7684\u8868\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7f51\u4e0a\u7684\u4ee3\u7801\u597d Copy\uff0c\u505a demo \u6f14\u793a\u5f88\u6e9c\uff0c\u62ff\u5230\u751f\u4ea7\u4e0a\u5c31\u662f\u8f66\u7978\u3002\u4e3b\u8981\u662f\u7406\u89e3\u7684\u592a\u7247\u9762\uff0c\u7406\u89e3\u4e0d\u6df1\uff0c\u5bb9\u6613\u7ffb\u8f66\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=4242\">\u4e00\u4e2aSQL\u8ba9\u5bfc\u81f4\u6574\u4e2a\u6570\u636e\u5e93\u90fd\u6574\u6302\u4e86<\/a><\/p><!-- <div class=\"bd-reward-stl\"><button id=\"bdRewardBtn\"><span><\/span><\/button><\/div> -->","protected":false},"excerpt":{"rendered":"<p>\u5728\u6211\u4eec\u7684\u7535\u5546\u7cfb\u7edf\u4e2d\uff0c\u9700\u6c42\u975e\u5e38\u591a\uff0c\u6c38\u8fdc\u505a\u4e0d\u5b8c\u3002\u540c\u65f6\u4e00\u4e9b\u4e5f\u7ecf\u5e38\u9762\u4e34\u4e00\u4e9b\u6280\u672f\u65b9\u9762\u7684\u95ee\u9898\uff0c\u6bd4\u5982\uff0c\u8fd9\u6b21\u4e00\u6761 SQL \u8bed\u53e5 [&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":[83,580,392,1683,1681],"class_list":["post-4242","post","type-post","status-publish","format-standard","hentry","category-sql","tag-mysql","tag-mysql----dba","tag-next-key-locks","tag-record-locks"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4242","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=4242"}],"version-history":[{"count":1,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4242\/revisions"}],"predecessor-version":[{"id":4243,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4242\/revisions\/4243"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4242"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4242"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4242"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}