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 SQL Server 2008 Enterprise Backup Compression???		  New Topic  Reply to Topic
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ostinoh
Yak Posting Veteran

60 Posts
Posted - 09/12/2012 :  12:53:45  Show Profile  Reply with Quote
Hello -

I have a database that is 124 GB before backup compression is applied. I also have other databases that after compression is applied during backup comes to a total of 16GB. The drive is only 136GB in size hence why I want to compress that database backup.

I have tested and ran the backup on the 124 GB database and its gets compressed to 64 GB.

There is 115 GB free after all the other databases backup and are compressed. When then can't the 124 GB which compresses down to 64GB not get backed up?

Regards,
David

chadmat
The Chadinator

USA
1961 Posts
Posted - 09/12/2012 :  13:17:49  Show Profile  Visit chadmat's Homepage  Reply with Quote
Are you backing them all up at the same time, or serially? When you backup with compression, SQL Server preallocates a file of approximately 1/3rd the size of the database. What are the sizes of all of the databases? If the preallocation is indeed your problem, you could use trace flag 3042 to eliminate that behavior and just have it allocate space as it is backing up.

-Chad
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