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I just put the debugger on an SQL query, and got a couple of indexing
recommendations that appear downright nonsensical:
Of course, as usual, "the names have been changed to protect the innocent."
Both of them on file FOOBAR
First suggestion, index FOOBAR on FOO, CORGE. (FOOBAR is already
uniquely keyed on FOO.)
Second suggestion, index FOOBAR on BAR, CORGE. (This makes a tiny bit
more sense, but only a tiny bit: there's no uniqueness constraint on
BAR, but there's already a logical non-uniquely keyed on BAR and BAZ,
and also one on BAZ and BAR, and there are only a few values of BAR
appearing in more than one record, only one with as many as 6, and none
with more than that.)
Any idea why we'd get such nonsensical suggestions?
--
JHHL
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