MySQL 5.6. Just maybe 500 rows.. using a LIMIT clause to prevent too many. InnoDB. If we kick of a query and in the WHERE clause use the wrong combination of fields that end up causing the query to not use an index, we "forgot" or "missed" using an index. So then I cancel the query and fix it so it uses an index to return immediately. In these scenarios I have to go and kill the query manually.
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