BACKUP LOG DATABASE to DISK NUL 

/*
 The below command will take the backup to disk
NUL
 Dont confuse with NULL, whatever we have
writtne below is correct NUL: is correct
 values only
*/
USE UserDatabaseName
go
BACKUP LOG UserDatabaseName TO DISK = 'NUL:'
WITH NO_COMPRESSION, STATS= 5


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