Hi,

When querying a largish (370,000 rows) table, a unique compound index
on its three int columns performs slower (as slow as no index at all)
than when I use the same index created without the "unique" keyword.

I've repeated it dozens of times: Create the index unique, and it's
slow, create it non-unique and it's fast.  The EXPLAINs look the same
for both.

Is this to be expected under some circumstances, or do I get to
isolate this messy situation (it's an ugly query) for a bug report?

MySQL-3.23.55, Linux, MyISAM.

Thanks,

--Pete

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