Truncate Log in Database Mirroring SQL Server 2008 2012

select log_reuse_wait_desc from sys.databases where name = ‘AdventureWorks’

If Output is “LOG_BACKUP”

— Execute 2 Times just in case —

BACKUP LOG AdventureWorks TO DISK=’NUL:’

— Now Truncate the Log —

USE AdventureWorks
GO
ALTER DATABASE AdventureWorksSET RECOVERY SIMPLE WITH NO_WAIT;
GO
DBCC SHRINKFILE(AdventureWorks_LOG, 100);
GO
ALTER DATABASE AdventureWorks SET RECOVERY FULL WITH NO_WAIT;
GO

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Sql server 2008 database mirroring manual failover

In case your mirroring has been suspended and you have tried everything else and nothing works. Your last option is to break the mirroring and restore the mirror database and connect the client application to the mirror site.

Before proceeding with this please note that doing this will require you to rebuild the Data Mirroring again.

At the Principal Site

ALTER DATABASE SET PARTNER OFF

At Mirror Site

RESTORE DATABASE WITH RECOVERY