VSS based full doesnt truncate logs


i have following queries on backup , recovery.

 

1.       take full backup   :   monitor firstlsn , lastlsn in msdb.dbo.backupset table

2.       do few transaction , perform transaction log backup   :   monitor firstlsn , lastlsn in msdb.dbo.backupset table

3.       do few transaction , perform transaction log backup   :   monitor firstlsn , lastlsn in msdb.dbo.backupset table

 

from firstlsn in steps 1 & 2 same.

i thinking lastlsn step-1 should equal firstlsn of step-2.

 

can clarify, if i’m missing or understanding of lsn wrong.

using vss sql writer based backup solution.

 

1.       when take full backup transaction logs not truncated.

2.       is there specific reason disallowing truncation , there way perform truncation via vss sql writer.

 

a database backup not truncate/empty log.
tibor karaszi, sql server mvp | web | blog


SQL Server  >  SQL Server Database Engine



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