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Hello Vijay,
See this discussion
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/959ca57c-c688-4243-baf3-9b3a535ea218/database-mirroring-unsent-log
Use below link to monitor REDO and and SEND queue
http://technet.microsoft.com/en-us/library/ms190030.aspx
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