Daniel Cummings wrote:
We want to convert a 200+ meg table to a heap table.  We've gotten pretty
good performance converting from InnoDb to MyIsam table but converting to a
heap table would give an even bigger performance boost.


You think it would, or it already has in your testing? Heap vs. MyISAM is not that much of a speed up on an OS that caches well even in the ideal situation for HEAP.




Does making a heap file this large make any sense?

Actually, there is no file. It is all in memory. But if you have the RAM the size should not be a problem.



Are there size limitations to heap tables?

Amount of RAM + max_heap_table_size setting in the server.

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