{"id":1617,"date":"2014-03-05T12:34:37","date_gmt":"2014-03-05T04:34:37","guid":{"rendered":"http:\/\/me.doucl.com\/?p=1617"},"modified":"2014-03-12T21:05:05","modified_gmt":"2014-03-12T13:05:05","slug":"mysql-seconds_behind_master","status":"publish","type":"post","link":"https:\/\/blog.vimge.com\/archives\/mysql\/mysql-seconds_behind_master.html","title":{"rendered":"MySQL\u540c\u6b65\u53c2\u6570Seconds_Behind_Master=0 \u5e76\u4e0d\u80fd\u786e\u5b9a\u4e3b\u4ece\u662f\u5426\u5ef6\u65f6"},"content":{"rendered":"<p>\u6700\u8fd1\u4e0a\u4e86\u51e0\u53f0\u4ece\u5e93\u4e4b\u540e\u7ecf\u5e38\u51fa\u73b0\u7591\u4f3c\u4e3b\u4ece\u540c\u6b65\u5ef6\u65f6\u95ee\u9898\uff0c\u4f46\u7ecf\u8fc7\u8fd0\u7ef4\u6392\u67e5\u540e\u7ed9\u51fa\u7ed3\u8bba\u662f\u4e3b\u4ece\u540c\u6b65\u6b63\u5e38\uff0c\u4e0d\u5b58\u5728\u6bd4\u8f83\u4e25\u91cd\u7684\u5ef6\u65f6\u95ee\u9898\uff0c\u4f9d\u636e\u662f\u53cd\u590d\u5b9e\u9a8c\u53c2\u6570Seconds_Behind_Master=0\uff0c\u4f46\u95ee\u9898\u771f\u7684\u771f\u7684\u662f\u5b58\u5728\u3002<\/p>\n<p>\u4e8b\u5b9e\u4e0a\u95ee\u9898\u5df2\u7ecf\u5f88\u660e\u786e\uff0c\u53ef\u80fd\u5b58\u5728\u7684\u95ee\u9898\u5c31\u90a3\u4e48\u51e0\u70b9\uff0c\u4e3b\u4ece\u5ef6\u65f6\u53ef\u80fd\u6027\u786e\u5b9e\u5f88\u5927\uff0c\u540e\u6765\u67e5\u4e86\u4e00\u4e0b\u8d44\u6599\u624d\u604d\u7136\uff0c\u539f\u6765\u00a0Seconds_Behind_Master\u53c2\u6570\u5e76\u4e0d\u80fd\u8bf4\u660e\u4e3b\u4ece\u540c\u6b65\u662f\u5426\u5ef6\u65f6\u95ee\u9898<\/p>\n<p>\u5b98\u65b9\u89e3\u91ca\u662f\uff1a<\/p>\n<ul>\n<li>When the slave is actively processing updates, this field shows the difference between the current timestamp on the slave and the original timestamp logged on the master for the most event currently being processed on the slave.<\/li>\n<\/ul>\n<div>\u51c6\u786e\u8bf4Seconds_Behind_Master\u6307\u7684\u662fslave \u7cfb\u7edf\u5f53\u524d\u65f6\u95f4\u548c\u5f53\u524dSQL thread\u5904\u7406\u7684binlog event\u65f6\u95f4\u5dee\uff0c\u8fd9\u4e2a\u65f6\u95f4\u5dee\u4e0ebinlog event \u548c slave \u7cfb\u7edf\u65f6\u95f4\u76f4\u63a5\u5173\u8054\u3002\u5982\u679cmaster \u548c slave\u65f6\u95f4\u4e0d\u540c\u6b65\uff0c\u5c31\u6709\u53ef\u80fd\u4ea7\u751f Seconds_Behind_Master \u53c2\u6570\u663e\u793a\u95ee\u9898\uff0c\u53ef\u4ee5\u5728\u4ece\u5e93\u6267\u884c\u00a0<em>date -s\u201c+1 hour\u201d \u00a0<\/em>\u770b\u770bSeconds_Behind_Master\u662f\u4e0d\u662f\u7a81\u7136\u53d8\u7684\u5f88\u5927\u4e86\uff1f<\/div>\n<div>\n<ul>\n<li>When no event is currently being processed on the slave, this value is 0.<\/li>\n<\/ul>\n<div>\u5f53\u524d\u6ca1\u6709\u5f85\u5904\u7406binlog event\u65f6\uff0cSeconds_Behind_Master\u4e5f\u4e3a0<\/div>\n<\/div>\n<div>\u8fd9\u6837\u95ee\u9898\u5c31\u5df2\u7ecf\u5f88\u660e\u6717\u4e86\uff0c\u56e0\u4e3aI\/O thread\u5e76\u4e0d\u80fd\u4fdd\u8bc1\u548cmaster\u4fdd\u6301\u5b9e\u65f6\u540c\u6b65\uff0c\u6240\u4ee5Seconds_Behind_Master=0\u4e5f\u4e0d\u540c\u8bf4\u660e\u540c\u6b65\u6ca1\u6709\u5ef6\u65f6\u3002<img title=\"\u66f4\u591a...\" src=\"http:\/\/doophp.sinaapp.com\/wp-includes\/js\/tinymce\/plugins\/wordpress\/img\/trans.gif\" alt=\"\" \/><!--more--><\/div>\n<div>\u53e6\u5916\u4ece\u00a0MySQL 5.6.9\u7248\u672c\u4e4b\u540e\uff0c\u5982\u679cSQL thread\u505c\u6b62\u5de5\u4f5c\u6216\u8005SQL thread\u5904\u7406\u5b8c\u6240\u6709\u00a0relay log\uff0c\u800cI\/O thread\u505c\u6b62\u5de5\u4f5c\u7684\u60c5\u51b5\u4e0b\u4e5f\u4f1a\u4f1a\u51fa\u73b0\u00a0\u00a0Seconds_Behind_Master=NULL<\/div>\n<div>\u53c2\u8003\u8d44\u6599\uff1a<br \/>\nhttp:\/\/dev.mysql.com\/doc\/refman\/5.6\/en\/show-slave-status.html<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u6700\u8fd1\u4e0a\u4e86\u51e0\u53f0\u4ece\u5e93\u4e4b\u540e\u7ecf\u5e38\u51fa\u73b0\u7591\u4f3c\u4e3b\u4ece\u540c\u6b65\u5ef6\u65f6\u95ee\u9898\uff0c\u4f46\u7ecf\u8fc7\u8fd0\u7ef4\u6392\u67e5\u540e\u7ed9\u51fa\u7ed3\u8bba\u662f\u4e3b\u4ece\u540c\u6b65\u6b63\u5e38\uff0c\u4e0d\u5b58\u5728\u6bd4\u8f83\u4e25\u91cd\u7684\u5ef6\u65f6 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[7],"tags":[118,132,120,119],"_links":{"self":[{"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/posts\/1617"}],"collection":[{"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/comments?post=1617"}],"version-history":[{"count":4,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/posts\/1617\/revisions"}],"predecessor-version":[{"id":1619,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/posts\/1617\/revisions\/1619"}],"wp:attachment":[{"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/media?parent=1617"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/categories?post=1617"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.vimge.com\/wp-json\/wp\/v2\/tags?post=1617"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}