BLEVEL on bit-mapped indexes

From: <Govind.Arumugam_at_alltel.com>
Date: Mon, 09 Dec 2002 13:54:51 -0800
Message-ID: <F001.00515A7C.20021209135451@fatcity.com>

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

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Author: <Govind.Arumugam_at_alltel.com
  INET: Govind.Arumugam_at_alltel.com

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