Big size of database logs SQL Server 2008
You need to do log backups at least daily (we do them every 15 mintues). Read in books online about how to backup the log (not the daatbase, the log, these are two separate types of backups) and you should find directions for how to truncate the log without backing it up which you will likely need since you have let it get this size. The make sure you have a current backup of the database before you start. Then truncate the log and immediately set of regularly schedueld backups so this doesn't happen again.