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So, if the user has BACKUP DATABASE and BACKUP LOG permission, than it should truncate the log also.
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the user could truncate the log<br />
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however, truncating the log is not a regular action to be executed, only if really needed<br />
typically, if the log file has grown MUCH too large, and you need to bring back the size to a reasonable size<br />
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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What is it you are trying to do? Is it to reclaim space?
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Any advice what is the permission require to perform truncate transaction log (non sa equivalent)?
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Any advice what is the permission require to perform truncate transaction log (non sa equivalent)?

Permission require to truncate transaction log

Microsoft SQL Server 2008 is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning. Major improvements include the  Always On technologies and support for unstructured data types.