Hi, Thanks for your reply, but the database has been in recovery for too long, usually takes less than a minut, we think it is very unlikely for it to come online. Operating system error 1450 keeps coming up. Disks have been checked, all the databases have come online except this one. the size of db is around 500GB, and SQL Server memory is 32 Gb. Do you think if it is the size of database? lack of memory? ...Thanks