Adjusting Innodb for Memory resident workload
As larger and larger amount of memory become common (512GB is something you can fit into relatively commodity server this day) many customers select to build their application so all or most of their database (frequently Innodb) fits into memory.
If all tables fit in Innodb buffer pool the performance for reads will be quite good however writes will still suffer because Innodb will do a lot of random IO during fuzzy checkpoint operation which often will become bottleneck. This problem makes some customers not concerned with persistence run Innodb of ram drive
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