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What you say is correct for DDS keyed LFs (AB that's built later would share
with ABC).
It is not correct for SQL indexes. For the ABC and AB keys scenario you
would actually have two access paths (no sharing).
I wish it was but SQL standards and all...
Elvis
Celebrating 10-Years of SQL Performance Excellence on IBM i5/OS and OS/400
www.centerfieldtechnology.com
I think that it's the indexes are shared, where possible, between access
paths rather than the other way round.
For example, an access path has 3 key fields in order: A, B and C. Creation
of this access path will result in 1 index. If a second access path is then
required with 2 key fields A and B then, on creation, will use the existing
index. So we have two access paths and only one index. However, if the two
access paths were created in reverse order then we'd have 2 indexes with the
associated overhead.
Cheers,
Keith
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