La ayuda del Database Desktop en esa opción será más conciso que yo 
Cita:
Maintained
Specifies whether to maintain the secondary index automatically.
Maintained indexes are updated by Database Desktop every time the table changes.
This speeds up certain operations like queries.
Maintained indexes are available for keyed tables only.
Non-maintained indexes are updated only when the index is used; for example, when you link tables or run a query.
The operation that uses the secondary index takes slightly longer using a non-maintained index, because Database Desktop must first update the index to recognize values that you have added, deleted, or changed, and then sort the table according to the new index. Also, if a non-maintained index becomes out of date, you cannot use it to change the viewing order of records.
Non-maintained indexes are most useful on tables that are read-only.
Search and locate operations
Database Desktop uses a secondary index to speed up some search and locate operations on Paradox tables if the index is:
Single-field
Case-sensitive
Maintained
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Vamos que es cuestión de F1
Saludos
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Si usted entendió mi comentario, contácteme y gustosamente,
se lo volveré a explicar hasta que no lo entienda, Gracias.
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