{"id":1078,"date":"2020-05-01T23:55:27","date_gmt":"2020-05-01T15:55:27","guid":{"rendered":"https:\/\/www.wjxy.net.cn\/?p=1078"},"modified":"2023-10-04T06:32:51","modified_gmt":"2023-10-03T22:32:51","slug":"%e8%ae%be%e7%bd%aemysql%e6%95%b0%e6%8d%ae%e5%ba%93%e4%b8%ba%e5%8f%aa%e8%af%bb","status":"publish","type":"post","link":"https:\/\/www.wjxy.net.cn\/?p=1078","title":{"rendered":"\u8bbe\u7f6emysql\u6570\u636e\u5e93\u4e3a\u53ea\u8bfb"},"content":{"rendered":"\r\n<p>mysql\u8bbe\u7f6e\u4e3a\u53ea\u8bfb\u540e\uff0c\u65e0\u6cd5\u589e\u5220\u6539\u3002<\/p>\r\n\r\n\r\n\r\n<p><strong>\u8bbe\u7f6e\u547d\u4ee4\uff1a<\/strong><\/p>\r\n\r\n\r\n\r\n<p>mysql&gt;&nbsp;set global read_only=1; &nbsp; &nbsp;#1\u662f\u53ea\u8bfb\uff0c0\u662f\u8bfb\u5199<br><\/p>\r\n\r\n\r\n\r\n<p>mysql> show global variables like &#8220;%read_only%&#8221;;<\/p>\r\n\r\n\r\n\r\n<p>\u4ee5\u4e0a\u547d\u4ee4\u91cd\u542f\u5c31\u5931\u6548<br>\u5982\u679c\u9700\u8981\u6c38\u4e45\u751f\u6548\u76f4\u63a5\u5728my.cnf\u91cc\u9762\u6dfb\u52a0\u4e00\u884c read_only=1\u5c31\u53ef\u4ee5\u4e86<\/p>\r\n\r\n\r\n\r\n<figure class=\"wp-block-image\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-2876\" src=\"https:\/\/www.wjxy.net.cn\/wp-content\/uploads\/2023\/10\/unnamed-file-32.png\" width=\"447\" height=\"163\" alt=\"\" srcset=\"https:\/\/www.wjxy.net.cn\/wp-content\/uploads\/2023\/10\/unnamed-file-32.png 447w, https:\/\/www.wjxy.net.cn\/wp-content\/uploads\/2023\/10\/unnamed-file-32-300x109.png 300w\" sizes=\"(max-width: 447px) 100vw, 447px\" \/><\/figure>\r\n\r\n\r\n\r\n<p><strong>\u4ee5\u4e0b\u662f\u76f8\u5173\u8bf4\u660e\uff1a<\/strong><\/p>\r\n\r\n\r\n\r\n<p>&nbsp; &nbsp; &nbsp; 1\u3001\u5bf9\u4e8e\u6570\u636e\u5e93\u8bfb\u5199\u72b6\u6001\uff0c\u4e3b\u8981\u9760 \u201cread_only\u201d\u5168\u5c40\u53c2\u6570\u6765\u8bbe\u5b9a\uff1b<\/p>\r\n\r\n\r\n\r\n<p>&nbsp; &nbsp; &nbsp; 2\u3001\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u6570\u636e\u5e93\u662f\u7528\u4e8e\u8bfb\u5199\u64cd\u4f5c\u7684\uff0c\u6240\u4ee5read_only\u53c2\u6570\u4e5f\u662f0\u6216faluse\u72b6\u6001\uff0c\u8fd9\u65f6\u5019\u4e0d\u8bba\u662f\u672c\u5730\u7528\u6237\u8fd8\u662f\u8fdc\u7a0b\u8bbf\u95ee\u6570\u636e\u5e93\u7684\u7528\u6237\uff0c\u90fd\u53ef\u4ee5\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c\uff1b<\/p>\r\n\r\n\r\n\r\n<p>&nbsp; &nbsp; &nbsp; 3\u3001\u5982\u9700\u8bbe\u7f6e\u4e3a\u53ea\u8bfb\u72b6\u6001\uff0c\u5c06\u8be5read_only\u53c2\u6570\u8bbe\u7f6e\u4e3a1\u6216TRUE\u72b6\u6001\uff0c\u4f46\u8bbe\u7f6e read_only=1 \u72b6\u6001\u6709\u4e24\u4e2a\u9700\u8981\u6ce8\u610f\u7684\u5730\u65b9\uff1a<br><\/p>\r\n\r\n\r\n\r\n<p>&nbsp; 1\uff09read_only=1\u53ea\u8bfb\u6a21\u5f0f\uff0c\u4e0d\u4f1a\u5f71\u54cdslave\u540c\u6b65\u590d\u5236\u7684\u529f\u80fd\uff0c\u6240\u4ee5\u5728MySQL slave\u5e93\u4e2d\u8bbe\u5b9a\u4e86read_only=1\u540e\uff0c\u901a\u8fc7 show slave statusG \uff0c\u547d\u4ee4\u67e5\u770bsalve\u72b6\u6001\uff0c\u53ef\u4ee5\u770b\u5230salve\u4ecd\u7136\u4f1a\u8bfb\u53d6master\u4e0a\u7684\u65e5\u5fd7\uff0c\u5e76\u4e14\u5728slave\u5e93\u4e2d\u5e94\u7528\u65e5\u5fd7\uff0c\u4fdd\u8bc1\u4e3b\u4ece\u6570\u636e\u5e93\u540c\u6b65\u4e00\u81f4\uff1b<br>&nbsp; 2\uff09read_only=1\u53ea\u8bfb\u6a21\u5f0f\uff0c\u53ef\u4ee5\u9650\u5b9a<strong>\u666e\u901a\u7528\u6237<\/strong>\u8fdb\u884c\u6570\u636e\u4fee\u6539\u7684\u64cd\u4f5c\uff0c\u4f46\u4e0d\u4f1a\u9650\u5b9a\u5177\u6709<strong>super\u6743\u9650\u7684\u7528\u6237<\/strong>\u7684\u6570\u636e\u4fee\u6539\u64cd\u4f5c\uff1b\u5728MySQL\u4e2d\u8bbe\u7f6eread_only=1\u540e\uff0c\u666e\u901a\u7684\u5e94\u7528\u7528\u6237\u8fdb\u884cinsert\u3001update\u3001delete\u7b49\u4f1a\u4ea7\u751f\u6570\u636e\u53d8\u5316\u7684DML\u64cd\u4f5c\u65f6\uff0c\u90fd\u4f1a\u62a5\u51fa\u6570\u636e\u5e93\u5904\u4e8e\u53ea\u8bfb\u6a21\u5f0f<strong>\u4e0d\u80fd\u53d1\u751f\u6570\u636e\u53d8\u5316<\/strong>\u7684\u9519\u8bef\uff0c\u4f46\u5177\u6709super\u6743\u9650\u7684\u7528\u6237\uff0c\u4f8b\u5982\u5728\u672c\u5730\u6216\u8fdc\u7a0b\u901a\u8fc7root\u7528\u6237\u767b\u5f55\u5230\u6570\u636e\u5e93\uff0c\u8fd8\u662f\u53ef\u4ee5\u8fdb\u884c\u6570\u636e\u53d8\u5316\u7684DML\u64cd\u4f5c\uff1b<br><\/p>\r\n\r\n\r\n\r\n<p>\u90a3\u4e48super\u7528\u6237\u600e\u4e48\u63a7\u5236\u8bfb\u5199\uff1f<\/p>\r\n\r\n\r\n\r\n<p>&nbsp; &nbsp; &nbsp; 1\u3001\u4e3a\u4e86\u786e\u4fdd\u6240\u6709\u7528\u6237\uff0c\u5305\u62ec\u5177\u6709super\u6743\u9650\u7684\u7528\u6237\u4e5f\u4e0d\u80fd\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c\uff0c\u5c31\u9700\u8981\u6267\u884c\u7ed9\u6240\u6709\u7684\u8868\u52a0\u8bfb\u9501\u7684\u547d\u4ee4 \u201cflush tables with read lock;\u201d\u8fd9\u6837\u4f7f\u7528\u5177\u6709super\u6743\u9650\u7684\u7528\u6237\u767b\u5f55\u6570\u636e\u5e93\uff0c\u60f3\u8981\u53d1\u751f\u6570\u636e\u53d8\u5316\u7684\u64cd\u4f5c\u65f6\uff0c\u4e5f\u4f1a\u63d0\u793a\u8868\u88ab\u9501\u5b9a\u4e0d\u80fd\u4fee\u6539\u7684\u62a5\u9519\u3002<\/p>\r\n\r\n\r\n\r\n<p><br>&nbsp; &nbsp; &nbsp; &nbsp; 1\uff09\u8fd9\u6837\u901a\u8fc7 \u8bbe\u7f6e\u201cread_only=1\u201d\u548c\u201cflush tables with read lock;\u201d\u4e24\u6761\u547d\u4ee4\uff0c\u5c31\u53ef\u4ee5\u786e\u4fdd\u6570\u636e\u5e93\u5904\u4e8e\u53ea\u8bfb\u6a21\u5f0f\uff0c\u4e0d\u4f1a\u53d1\u751f\u4efb\u4f55\u6570\u636e\u6539\u53d8\u3002<\/p>\r\n\r\n\r\n\r\n<p>&nbsp; &nbsp; &nbsp; &nbsp; 2\uff09\u4f46\u540c\u65f6\u7531\u4e8e\u52a0\u8868\u9501\u7684\u547d\u4ee4\u5bf9\u6570\u636e\u5e93\u8868\u9650\u5b9a\u975e\u5e38\u4e25\u683c\uff0c\u5982\u679c\u5728slave\u4ece\u5e93\u4e0a\u6267\u884c\u8fd9\u4e2a\u547d\u4ee4\u540e\uff0cslave\u5e93\u53ef\u4ee5\u4ecemaster\u8bfb\u53d6binlog\u65e5\u5fd7\uff0c\u4f46<strong>\u4e0d\u80fd\u591f\u5e94\u7528\u65e5\u5fd7<\/strong>\uff0cslave\u5e93\u4e0d\u80fd\u53d1\u751f\u6570\u636e\u6539\u53d8\uff0c\u5f53\u7136\u4e5f\u4e0d\u80fd\u591f\u5b9e\u73b0\u4e3b\u4ece\u540c\u6b65\u4e86\uff0c\u8fd9\u65f6\u5982\u679c\u4f7f\u7528 \u201cunlock tables;\u201d\u89e3\u9664\u5168\u5c40\u7684\u8868\u8bfb\u9501\uff0cslave\u5c31\u4f1a\u5e94\u7528\u4ecemaster\u8bfb\u53d6\u5230\u7684binlog\u65e5\u5fd7\uff0c\u7ee7\u7eed\u4fdd\u8bc1\u4e3b\u4ece\u5e93\u6570\u636e\u5e93\u4e00\u81f4\u540c\u6b65\u3002<br><br><\/p>\r\n\r\n\r\n\r\n<p>&nbsp; &nbsp; &nbsp; &nbsp;2\u3001\u4e3a\u4e86\u4fdd\u8bc1\u4e3b\u4ece\u540c\u6b65\u53ef\u4ee5\u4e00\u76f4\u8fdb\u884c\uff0c\u5728slave\u5e93\u4e0a\u8981\u4fdd\u8bc1\u5177\u6709super\u6743\u9650\u7684root\u7b49\u7528\u6237\u53ea\u80fd\u5728\u672c\u5730\u767b\u5f55\uff0c\u4e0d\u4f1a\u53d1\u751f\u6570\u636e\u53d8\u5316\uff0c\u5176\u4ed6\u8fdc\u7a0b\u8fde\u63a5\u7684\u5e94\u7528\u7528\u6237\u53ea\u6309\u9700\u5206\u914d\u4e3aselect,insert,update,delete\u7b49\u6743\u9650\uff0c\u4fdd\u8bc1\u6ca1\u6709super\u6743\u9650\uff0c\u5219\u53ea\u9700\u8981\u5c06salve\u8bbe\u5b9a\u201cread_only=1\u201d\u6a21\u5f0f\uff0c\u5373\u53ef\u4fdd\u8bc1\u4e3b\u4ece\u540c\u6b65\uff0c\u53c8\u53ef\u4ee5\u5b9e\u73b0\u4ece\u5e93\u53ea\u8bfb\u3002<br><br><br>&nbsp; &nbsp; &nbsp; &nbsp;3\u3001\u8bbe\u5b9a\u201cread_only=1\u201d\u53ea\u8bfb\u6a21\u5f0f\u5f00\u542f\u7684\u89e3\u9501\u547d\u4ee4\u4e3a\u8bbe\u5b9a\u201cread_only=0\u201d;\u8bbe\u5b9a\u5168\u5c40\u9501\u201cflush tables with read lock;\u201d\uff0c\u5bf9\u5e94\u7684\u89e3\u9501\u6a21\u5f0f\u547d\u4ee4\u4e3a\uff1a\u201cunlock tables;\u201d.<br><br><\/p>\r\n\r\n\r\n\r\n<p>&nbsp; &nbsp; &nbsp; &nbsp;4\u3001\u5f53\u7136\u8bbe\u5b9a\u4e86read_only=1\u540e\uff0c\u6240\u6709\u7684select\u67e5\u8be2\u64cd\u4f5c\u90fd\u662f\u53ef\u4ee5\u6b63\u5e38\u8fdb\u884c\u7684\u3002<\/p>\r\n","protected":false},"excerpt":{"rendered":"<p>mysql\u8bbe\u7f6e\u4e3a\u53ea\u8bfb\u540e\uff0c\u65e0\u6cd5\u589e\u5220\u6539\u3002 \u8bbe\u7f6e\u547d\u4ee4\uff1a mysql&gt;&nbsp;set global read [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"_links":{"self":[{"href":"https:\/\/www.wjxy.net.cn\/index.php?rest_route=\/wp\/v2\/posts\/1078"}],"collection":[{"href":"https:\/\/www.wjxy.net.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wjxy.net.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wjxy.net.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wjxy.net.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1078"}],"version-history":[{"count":3,"href":"https:\/\/www.wjxy.net.cn\/index.php?rest_route=\/wp\/v2\/posts\/1078\/revisions"}],"predecessor-version":[{"id":2877,"href":"https:\/\/www.wjxy.net.cn\/index.php?rest_route=\/wp\/v2\/posts\/1078\/revisions\/2877"}],"wp:attachment":[{"href":"https:\/\/www.wjxy.net.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1078"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wjxy.net.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1078"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wjxy.net.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1078"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}