You need to patch to 9204 or above (9207 is currently the highest, 9208 coming 'soon'). I had exactly the same problem on a 9203 (I think) database. We had a table with an index that was over 4000 bytes long. I've no idea how it was create or how the problem was detected - it was over a year and a half ago, and I'm getting old) but I've a funny feeling that it was a bug introduced at some point.
Our app was a third party one (oh hum) and full of little niceties such as an index consisting of two columns each varchar2(4000) etc. It also had no primary keys on the tables and suffered from duplicates all the time. This was due to 'select max(id) from table; add 1; use as new id. Oops !). I'm no longer at that company :o)
See note 136158.1 for details - although it appears to imply that 6498 is the max key size in a 16K block, yet yours is barfing at 6398. Who's nicked the 100 bytes ? However, you also show that your block sizes are 8192 each which surprises me as an 8K block supports a maximum key length of only 3218 bytes. (Which might really be 3118 - who knows?).
You might also be hitting bug 1919383, see note 1919383.8 for details.
HTH
Cheers, Norman.
Norman Dunbar. Contract Oracle DBA. Rivers House, Leeds.
Internal : 7 28 2051 External : 0113 231 2051
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