BLEVEL on bit-mapped indexes

[Govind.Arumugam]

According to oracle documentation or metalink sources,  if the BLEVEL were to be more than 4, it is recommended to rebuild the index.   select index_name, blevel, decode(blevel,0,'OK BLEVEL',1,'OK BLEVEL', 2,'OK BLEVEL',3,'OK BLEVEL',4, 'OK BLEVEL','BLEVEL HIGH') OK from dba_indexes where owner = '<owner-name>';   When troubleshooting a performance problem in a data warehousing environment I found that some of the indexes had BLEVEL at 5 or 6.   I am curious to know whether these indexes are candidates for rebuild. Should be looking at BLEVEL for bit-mapped indexes at all?  I am not that experienced in bit-mapped indexes hence posting it to the group.   Thanks in advance.   Govind