Anyone could explain me how colculate the record length of an index ?

thanks

analyze index OWNER.INDEX_NAME validate structure;

select * from index_stats;

The index_stats view will show you some vital statistics about
the index you just validated.  Pay attention to the LF_ROWS_LEN
and the LF_ROWS.

LF_ROWS:  Number of leaf rows in the index.
LF_ROWS_LEN:  Sum of the length of all leaf rows.

The average length of an index leaf row is therefore
LF_ROWS_LEN / LF_ROWS.

You also might want to consider the index /branch/ size,
computed similarly with BR_ROWS_LEN / BR_ROWS ...

--
-brett neumeier