RE: concatenated index

> Thanks Stephane. Is there some place (some article) other
> than the Oracle
> Manual which deals with this(latest) features on the composite index

Asktom has or had an article on this try (will likely wrap)

http://asktom.oracle.com/pls/ask/f?p=4950:8:409221425463834426::NO::F495 0_P8_DISPLAYID,F4950_P8_CRITERIA:5671539468597, For example.

I attempt to deal with this, but it may not be great in www.niall.litchfield.dial.pipex.com/OracleMyths.zip basically my point is, the value of indexing a column is how often it is used, not necessarily how selective it is and that advances in access paths (specifically compressed indexes and the index skip scan method) *may* mean that doing the opposite of conventional wisdom makes sense.

My guess is that skip scan and compression work best with STATUS type columns. I.E those with very few values which are rarely but sometimes updated, and which exist in OLTP databases. Low cardinality columns in a datawarehouse environment are what bitmap indexes were designed for.

Cheers

Niall

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