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在mysql中执行以下命令：
purge {master | binary} logs to ‘log_name'
purge {master | binary} logs before ‘date'
purge {master|binary} logs before date_sub(now(),interval 7 day);
例如：
mysql>purge master logs to ‘mysql-bin.010′;
mysql>purge master logs before ‘2008-06-22 13:00:00′;
mysql>purge master logs before date_sub( now( ), interval 7 day);
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