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Re: Open tables with Partitioning
Posted by: Mattias Jonsson
Date: March 02, 2011 07:29AM

There is overhead when opening a partitioned table, since every partitions handler needs to be opened (which also will require additional handler memory etc.)

For InnoDB it currently have multiple copies of the InnoDB metadata/datadict, since that is stored within the handler, but the table level metadata will not be duplicated.

So opening a partitioned table will take more time if there is a lot of partitions, compared to a non partitioned table. Note however that the opened table is cached in the table cache and will be reused without the need of closing and opening it again.

The current problem is locking which is done for every statement. See bug#37252. I am currently working on fixing this by implementing WL#4443.

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