Fragmentation Allowance

If you are using bitmap or RLE compression, some fragmentation occurs, the amount of which is based on individual database and operating system configurations and cannot be precisely predicted.

As a rough estimate, calculate 20% of the compressed database size (value DE from Table 247, Worksheet: Estimate of Disk Requirements for a Database) and write the result to the cell labeled DG in the same table.

Example

Calculating fragmentation allowance assuming a compressed database size of 5,769,000,000 bytes:

5,769,000,000 bytes 
* .2 
= 1,153,800,000 bytes