____
_/\/ando,

>both you and Guido seem to imply that the value that you set with SET
>STATISTICS is the selectivity of an index.

I do not imply anything, just trying to better understand how IB works.

>In particular, I don't think that the selectivity of an index is
>something that IB keeps track of or use.

Try this:

select rdb$index_name, rdb$relation_name, rdb$statistics
from rdb$indices
where rdb$system_flag is null

Regards

Zile