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No, you can't build an index over two tables. Query optimizer can perform
things like bitmap merge though, so you should still build indexes over
tables being joined etc.
BTW, nowadays most queries are running in SQE, so you should really start
using Visual Explain rather than debug messages. Visual Explain has an
index advisor in it as well.
Elvis
Celebrating 11-Years of SQL Performance Excellence on IBM i, i5/OS and
OS/400
www.centerfieldtechnology.com
-----Original Message-----
Subject: SQL index possible with keys from two tables?
Last I knew, this wasn't possible but wanted to make sure I didn't miss
something.
A join LF in DDS only supports key fields from a single file. Is it
possible yet in SQL at V5R4 to create an index with keys from two tables? I
suspect no, because running under debug the optimizer messages aren't
recommending an index I don't have. But I wanted to make sure...
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