The number of the index.
SQL Drivers (SQL Server, DB2 and ODBC)
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The Index_Number keyword defines an index keyword group. All subsequent index keyword settings will apply to the index with the number specified. The index number will change when another Index_Number keyword is used.
It is not possible to separate settings under multiple index groups. Using the same index number twice (or more) will result in errors in the table definition.
Indexes for a table are numbered in the following order:
All indexes defined for the table will be read in.
All settings in the intermediate file are read and the indexes defined are assigned a number.
Lastly, all indexes that have not been assigned a number yet will be assigned a number starting with the highest number used until now + 1. The remaining indexes are numbered in alphabetical order.