Re: Count(*) query is slower on partitioned table
Posted by:
Rick James
Date: December 10, 2016 12:30AM
Yet another reason for not using PARTITIONing.
I cannot explain your third case, which should have limited itself to the one partition.
There is perhaps never a performance advantage in PARTITION BY RANGE(the-primary-key). Is that your actual case?
Here are my comments on partitioning:
https://mariadb.com/kb/en/mariadb/partition-maintenance/ , including the only 4 use cases (that I know of) for which performance is benefited.
Another pet peeve of mine: Notice how useless Profiling is. (BTW, it is deprecated and going away.)
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