I did system refresh ( from PRD to QAS , platform Windows 2008 R2 and MSsql) the system was up and running fine. The system was absolutely fine for one day and the day after the DB crashed , not sure what happened, is there a way i can find the logs through which i can come to know what exactly happened. Also post refresh when i was trying to run BDLS , the job was getting cancelled , the job log showed there is another conversion already running , when i checked the tables the conversion had already happened . Please tell me can running BDLS which cancelled many times could be the cause for the DB crash, if yes where can i find the logs for this , if not what else could have happened that the DB crashed . Thanks for your responses in advance.