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Re: Advice on partitioning
Posted by: Rick James
Date: April 24, 2015 05:34PM

Based on what you say, I see no advantage from PARTITIONing. Furthermore, 1000 partitions will show you down (until about 5.7).

But maybe PARTITIONing could be useful...

Please provide SHOW CREATE TABLE -- This is to study the potential impact of PARTITIONing on the indexes, and vice versa.

Please provide a sampling of the important queries -- This is to judge which (if any!) will be sped up by PARTITIONing.

Please provide some size information -- This is to get a feel for CPU-bound vs IO-bound.

Some notes:
* In almost no case will a point query (eg, SELECT on PRIMARY KEY) be sped up by partitioning.
* INSERTs/UPDATEs open _all_ partitions before deciding what to do -- This can be a drawback, especially for 1000 partitions. (Oracle is working on 'fixing' that.)
* I have yet to see a significant performance improvement for anything other than BY RANGE.

Since you say that BY HASH is 'better', I am eager to hear more details.

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