Slow query log and long_query_time
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Answer Answered by Petri Rautiainen in this comment.
Most likely you have log_queries_not_using_indexes enabled in your my.cnf, this would explain the issue as the count() you are using does not use indexes. Also quick way to check if it is enable through CLI with next query: SELECT @@log_queries_not_using_indexes;
Did try on own 10.0.21 and did not have this on by default and could not replicate the problem without enable previously mentioned attribute;
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