'NK' |
Null Key Stripping |
Strips trailing nulls from a key; i.e. key values $00$, $0000$ and $000000$ become $$.
A file with the 'NK' parameter enabled will pad all keys with null bytes; thus, a key of $00$, $0000$ and $000000$ will be considered the same. However, files with a large number of records will function better due to the issue with legacy file structures.
Off - No stripping occurs.