Use Base user index (-baseuserindex) in conjunction with User index range (-userindexrangesize) to specify the first index, and the the number of indexes for which statistics are collected in the_UserIndexStat VST.

Operating system and syntax UNIX / Windows 
-baseuserindex n
Use with Maximum value Minimum value Single-user default Multi-user default
Database Server 32767 -32767 1 1
n
The starting index number for the range of indexes for which you want gather information in the _UserIndexStat VST.
Note: If the User index base and range are not specified, the _UserIndexStat VST is dimensioned using the values specified for the _IndexStat VST (-baseindex and -indexrangesize).