MySQL Forums :: Partitioning :: Count(*) query is slower on partitioned table


Advanced Search

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.)

Options: ReplyQuote


Subject Views Written By Posted
Count(*) query is slower on partitioned table 525 Darren Demicoli 12/03/2016 11:53AM
Re: Count(*) query is slower on partitioned table 180 Rick James 12/10/2016 12:30AM
Re: Count(*) query is slower on partitioned table 221 Darren Demicoli 12/10/2016 06:48AM
Re: Count(*) query is slower on partitioned table 183 Rick James 12/12/2016 01:56PM
Re: Count(*) query is slower on partitioned table 210 Darren Demicoli 12/13/2016 02:50PM
Re: Count(*) query is slower on partitioned table 150 Rick James 12/21/2016 12:35AM


Sorry, only registered users may post in this forum.

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.