Kim,
The first thing I'd do is run a MyISAMChk on the table to see if the index
is damaged. The second thing I'd do is run Optimize on the tables regularly
because after a lot of rows have been deleted it leaves holes in the table
which slows down table performance.
Of course you can do an Explain on:
select * from products
LEFT JOIN items ON products.product_id = items.product_id
WHERE items.product_id IS NULL;
to see if it is using the index. And finally turning it into a Subselect
might speed it up. (Yes, subselects can run faster than table joins in some
cases)
Mike
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