Permission require to truncate transaction log

Any advice what is the permission require to perform truncate transaction log (non sa equivalent)?
Keng0499Asked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
to perform truncate log, you need the backup log permission:
http://msdn.microsoft.com/en-us/library/ms179478.aspx
Security -  Permissions
BACKUP DATABASE and BACKUP LOG permissions default to members of the sysadmin fixed server role and the db_owner and db_backupoperator fixed database roles.
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Keng0499Author Commented:
So, if the user has BACKUP DATABASE and BACKUP LOG permission, than it should truncate the log also.
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
the user could truncate the log

however, truncating the log is not a regular action to be executed, only if really needed
typically, if the log file has grown MUCH too large, and you need to bring back the size to a reasonable size
in which case to not is that if you expect the log file to SHRINK as a result of the truncate log statement, you did not yet understand fully how the transaction log file works, and you should do some readings on that subject
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Gerald ConnollyCommented:
What is it you are trying to do? Is it to reclaim space?
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Microsoft SQL Server 2008

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