Joined: 14 Jun 2006 Posts: 331 Location: Jacksonville, FL
Using number #1 would cost less. When you block records with the most efficient blocksize, you are able to store the maximum records per track. If you are not using the optimum blocksize, fewer records are stored per track, so you need addition space to handle the complete file. When the system reads records, there is also a small CPU savings when unblocking records stored at their optimum blocksize because there are fewer blocks for the CPU to unblock into individual records.