Log Files - How To Clean Up

I had received a message that my log file is full and it do not enable to me to do a database backup before free up disk space. How do i clean up de log file (_log.ldf)?check 'dbcc shrinkfile' in BOL,

dbcc shrinkfile('db_log',size,truncateonly)|||Thanks, mallier, but my _log.ldf is on another disk driver under mssql\data folder. After executing the command you wrote, i got a message 'not found in the system files'|||run this query to get the log name in ur db


select *from sysfiles
-- u will get log name from name column with extension '_Log'

--replace that name in 'db_Log'|||ok, mallier, excuse me again, but the _log.ldf is 18GB great yet. Some system table was updated after the last command you wrote, but i need clean that _log.ldf to free up space in the disk drive.|||put the database in simple recoverry mode. Checkpoint the database. Backup the database. open QA. run "sp_helpdb (dbname). Find the file number for the log. execute dbcc shrinkfile(<file number for the log.).