I am facing the following problem on production server,I am getting the full backup(600MB) and differential backup size(598MB).On off peak hours I have taken full backup and just after a min I have taken differential backup but the sizes of both backups are almost same.As per BOL diff backup will contain only the modified extents after the recent full backup.
Do I have to make any changes in sql server settings before taking backups.
We have 3 different servers and I am facing this problem only on one of the 3 servers,other servers are giving differential backups in KBs (as expected) if I take it within a span of one minute but I am facing this problem only on server1. I am using sql server R2. I have also scheduled transaction log backup every 1 hour and trans log backup size is in kbs(14kb);but the problem is with diff backup size.
Only maintenance plan is running for taking backups(full,diff,trans log) No other job is running which might continuously update tables.