master log 与relay log的关系

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master log 与relay log的关系

--master log 与relay log的关系 -------------------------------2014/06/09 Just to clarify, there are three sets of file/position coordinates in SHOW SLAVE STATUS: 1) The position, ON THE MASTER, from which the I/O thread is reading: Master_Log_File/Read_M…

mysql relay log参数汇总

前言:MySQL进行主主复制或主从复制的时候会在配置文件制定的目录下面产生相应的relay log,本文档总结这些相关参数的定义及解释. 1.什么是relay log The relay log, like the binary log, consists of a set of numbered files containing events that describe database changes, and an index file that contains the names of…

恢复误删除表黑科技之relay log大法

Preface In my previous blogs,I've demonstrated several mothods of how to rescue a dropped table(or truncated table as well). full mysqldump backup + binlog on master(master was normally running) full Xtrabackup backup + binlog on mast…

mysql 主从关系ERROR 1872 (HY000): Slave failed to initialize relay log info structure from the repository

连接 amoeba-mysql出现Could not create a validated object, cause: ValidateObject failed mysql> start slave;ERROR 1872 (HY000): Slave failed to initialize relay log info structure from the repository 原因:检查my.cnf,原来没指定relay_log,mysql默认产生的relay_log名被该server上…

MySQL 主从延迟几万秒 Queueing master event to the relay log（转）

数据库版本Server version: 5.6.24-log Source distribution 问题描述数据采集平台业务数据库由于批量灌数据导致主从延迟上万秒. 复制线程长期处于Queueing master event to the relay log状态. 监控数据显示1.Seconds_Behind_Master 维持在6w秒左右,且有上升趋势.2.主库有大量的binlog积压无法同步到从库,但主从库的网卡流量都很低远未达到瓶颈.3.从库的qps与tps很低,维持在几百左右…

Slave SQL_THREAD如何重放Relay log

复制的介绍: 根据日志定义的模式不一样,可以分为:Statement(SBR)模式,Row(RBR)格式或者是MIXED格式,记录最小的单位是一个Event,binlog日志前4个字节是一个magic number,接下来19个字节记录Format desc evnet:FDE.MySQL5.6版本增加了GTID复制. 下面对三种binlog格式的优缺点: Statement(基于语句级的复制): 优点: 1)Binlog文件较小 2)日志是包含用户执行的原始SQL,方便统计和审计 3)出现最早…