MySQL字符集相关变量介绍及binlog中字符集相关缺陷分析 MySQL支持多种字符集（character set）提供用户存储数据，同时允许用不同排序规则（collation）做比较。本文基于MySQL5.7介绍了字符集相关变量的使用，通过例子描述了这些变量具体意义。分析了MySQL binl...

MySQL内核月报 2015.02-MySQL · 捉虫动态· 变量修改导致binlog错误

背景 MySQL 5.6.6 版本新加了这样一个参数——log_bin_use_v1_row_events，这个参数用来控制binlog中Rows_log_event的格式，如果这个值为1的话，就用v1版的Rows_log_event格式（即5.6.6之前的），默认是0，用新的v2版本的格式，更详细...

MySQL内核月报 2014.11-MySQL·　捉虫动态·SIGHUP 导致 binlog 写错

bug描述这是5.6中和gtid相关的一个bug，当 mysqld 收到 sighup 信号（比如 kill -1）的时候，会 flush binlog，但是新生成binlog开头没写 Previous_gtids_log_event，这会导致下面 2 个问题：这个时候 mysqld 重启的...

MySQL内核月报 2014.10-MySQL·　捉虫动态·binlog重放失败

背景在 MySQL 日常维护中，要回滚或者恢复数据，我们经常会用 binlog 来在数据库上重放，执行类似下面的语句： mysqlbinlog mysql-bin.000001 | mysql -hxxxx -Pxx -u 最近遇到了这样一个问题，在重放 binlog 时，mysqld 报这样的错...

MySQL内核月报 2014.09-MySQL·　捉虫动态·GTID 和 binlog_checksum

现象描述　　在5.6主备环境下，主备都开启GTID-MODE，备库开启crc校验，主库不开。重启备库sql线程后，备库sql线程停止Last_Error显示：Relay log read failure: Could not parse relay log event entry. Th...

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