Directs REORG to leave free space within index blocks for future updates. Arguments to this qualifier must be integers from 30 to 100 that represent the percentage of the index block that REORG can fill. REORG uses this number to decide whether to place more information in an index block, or create space by moving data to another block. The format of the INDEX_FILL_FACTOR qualifier is:

-I[NDEX_FILL_FACTOR]=integer

Under certain conditions, especially with large database block sizes, it may be possible to achieve faster throughput by using a smaller fill factor for index blocks than for data blocks. By default, the INDEX_FILL_FACTOR is the value of FILL_FACTOR regardless of whether that value is explicitly specified or implicitly obtained by default.