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Re: Proposals for improving BKA/MRR visibility in EXPLAIN anddiagnostics
>>>>> "Philip" == Philip Stoev <pstoev@xxxxxxxxxxxx> writes:
>> If Handler_mrr_key_sort_count == Handler_multi_range_read_init_count then
>> had enough buffer space. If key_sort_count is two times greater than the
>> of init operations, then one could conclude that on average two buffer
>> were needed and increasing buffer size up to 2x would be beneficial.
Philip> I would say that instead there must be a variable that shows the number of
Philip> buffer refills. This way the user gets a single variable to monitor, without
Philip> having to do any math. Then, the performance advice becomes "watch this
Philip> variable and try to minimize it by using a larger buffer", the way we
Philip> currently say "watch the .ee.g threads created variable and try to minimize
Philip> it by using a larger thread pool".
Agree that having a variable (maybe even in addition to the other
suggested one) for buffer refills would be a good thing!