Re: 6-table join, good indices, bad perf
Hi,
Since the query does not contain any aggregation, what is the point of the GROUP BY clause?
You could also try adding indexes on SegmentsVCG2LU.vcc and VehicleContexts.vcc to make it less costly to do the filtering on these tables earlier index join sequence.
Also, if you have an index on GroupStructure.sgc, it will be possible to start with the Group table and possibly avoid sorting for grouping.
Øystein Grøvlen,
Senior Principal Software Engineer,
MySQL Group, Oracle,
Trondheim, Norway
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Re: 6-table join, good indices, bad perf
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