mysqlbinlog把mysql二进制文件转换文本文件

目前一些项目已经迁移到Mysql5.5，而在mysql5.5中binlog_format为mixed这样的话，默认情况下的Mysql binary log就是base64格式，不可读，为了在排查问题时候，提供帮助研读下mysqlbinlog的帮助文档得知可以解码：

  –base64-output[=name]
Determine when the output statements should be
base64-encoded BINLOG statements: ’never’ disables it and
works only for binlogs without row-based events;
 ’decode-rows’ decodes row events into commented SQL
                      statements if the –verbose option is also given; ’auto’
prints base64 only when necessary (i.e., for row-based
events and format description events); ’always’ prints
base64 whenever possible. ’always’ is deprecated, will be
removed in a future version, and should not be used in a
production system.  –base64-output with no ’name’
argument is equivalent to –base64-output=always and is
also deprecated.  If no –base64-output[=name] option is
given at all, the default is ’auto’.
mysqlbinlog –base64-output=DECODE-ROWS -v mysql-bin.00002

通过给定–base64-output和-v参数，可以解码row模式下的binary log。

unknown variable ‘default-character-set=utf8mb4′错误

一个手机网的项目，使用的编码为utf8mb4，一切都是正常的。

到了用mysqlbinlog的时候，提示如下：

[root@localhost data]# mysqlbinlog mysql-bin-500.000011
mysqlbinlog: unknown variable ‘default-character-set=utf8mb4′

解决方法：

1. 修改my.cnf，在[client]下注释或删除default-character-set=utf8mb4；
2. 在命令行中加入–no-defaults开关，使用mysqlbinlog –no-defaults；