The calculation for the space required to store the index files (essxxxxx.ind) uses the following factors:
Number of existing blocks (value DB from Table 244, Worksheet: List of Factors That Affect Disk Space Requirements of a Database)
The minimum size for the index is 8,216,576 bytes (8 MB). To calculate the size of a database index, including all index files, perform the following calculation:
number of existing blocks * 112 bytes = the size of database index
In the cell labeled DF in Table 247, Worksheet: Estimate of Disk Requirements for a Database, write whichever is the larger number: the results of the calculation or 8,216,576.
Assume a database with 15,000,000 blocks.
15,000,000 blocks * 112 = 1,680,000,000 bytes