bitmapped indexes

From: Valiveru, Siva <SValiveru_at_ea.com>
Date: Wed, 27 Jun 2001 20:31:28 -0700
Message-ID: <F001.0033B386.20010627203022@fatcity.com>

Need a advice here ..

Table "A"

Col1 - PK
Col2 - Low cardinality column ( say 2 or 3 distinct values) Col3- Low cardinality column
col4- Log Cardinality column

which of the following options is appropriate for the queries like this( Ours is a high OLTP APPLICATION)

select * from A where col2='a' and col3='1' and col4 = 'b' ;

1. Separate bitmap indexes on each of the columns(col1, col2, col3)
2. Composite bitmap index on the columns col1,col2,col3.
3. Composite b*tree index on the columns col1,col2,col3.
   • I remember reading that bitmap is not suitable for high transactional applications..because of the locks on the blocks..but what is the another alternative ..

Thanks, Siva

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Author: Valiveru, Siva
  INET: SValiveru_at_ea.com

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