MDAC 2.5 SDK - OLE DB Programmer's Reference
Appendix C: OLE DB Properties
Property group: Index
Property set: DBPROPSET_INDEX
Type: VT_I4
Typical R/W: R/W
Description: Fill Factor
For a B+-tree index, this property represents the storage utilization factor of page nodes during the creation of the index. The value is an integer from 1 to 100, representing the percentage of use of an index node. For a linear hash index, this property represents the storage utilization of the entire hash structure (the ratio of the used area to the total allocated area) before a file structure expansion occurs.