Hi, I have a large database, 2.7 TB. I have been running DBCC Checkdb on this database for years without issue. Suddenly the last few weeks, my Checkdb fails with this error. M:\db_name.MDF:MSSQL_DBCC7: Operating system error 1450(Insufficient system resources exist to complete the requested service.) encountered. I am running SQL Server 2005 64 bit SP 4. I realize this is a sparse file problem, but the mystery is that I have over 700 gig of free space on the volume where the db is stored. My tempdb volume has 500 gig free as well. The server has 128 gig of memory. By using the dbcc checkdb with estimateonly I see that my check should only use 50 gig of space. I am lost as to why I'm running out of system resources and I can't figure out any way to fix this. It is almost like SQL Server or windows doesn't see the free space I have. Any ideas? Thanks.