Recycle SQL Server Log FilesPosted: August 7, 2014
You have two ways to recycle SQL Server log files: restart SQL Server Instance or through T-SQL: sp_cycle_errorlog.
Set how many error log files you want to keep before they are got recycled: you can choose 30 from:
>>SQL Server Logs
>> right clcik on it and choose Configure
>>Check the checkbox for Limit number of error log files before they are recycled and change the Maximum number of error log files: 30
Create a new job to run this : sp_cycle_errorlog as T-SQL
and schedule it to run at midnight every day.