mysqlbinlog把mysql二進位檔案轉換文字檔

目前一些項目已經遷移到Mysql5.5，而在mysql5.5中binlog_format為mixed這樣的話，預設情況下的Mysql binary log就是base64格式，不可讀，為了在排查問題時候，提供協助研讀下mysqlbinlog的協助文檔得知可以解碼：

  –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

通過給定–base64-output和-v參數，可以解碼row模式下的binary log。

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

一個手機網的項目，使用的編碼為utf8mb4，一切都是正常的。

到了用mysqlbinlog的時候，提示如下：

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

解決方案：

1. 修改my.cnf，在[client]下注釋或刪除default-character-set=utf8mb4；
2. 在命令列中加入–no-defaults開關，使用mysqlbinlog –no-defaults；