Re: Setting group_concat_max_len
See "Profiling".
But I prefer to use the "slow log". It gives, after the fact, the elapsed time and the number of rows "examined".
Naughty queries are usually I/O-bound, not CPU-bound, so elapsed time is a better measure. Also, elapsed time is important to the end-user.
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Re: Setting group_concat_max_len
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