As you see MySQL is doing great in InnoDB performance improvements, so we decided to concentrate more on additional InnoDB features, which will make difference.
Beside ideas I put before https://www.percona.com/blog/2009/03/30/my-hot-list-for-next-innodb-features/ (and one of them – moving InnoDB tables between servers are currently under development), we have few mores:
– Stick some InnoDB tables / indexes in buffer pool, or set priority for InnoDB tables. That means tables with bigger priority will be have more chances to stay in buffer pool then tables with lower priority. Link to blueprint https://blueprints.launchpad.net/percona-patches/+spec/lru-priority-patch
– Separate LRU list into several lists, and in this way it will allow us to emulate several buffer pool, with features to keep different tables in different buffer pools and also to decrease contention on buffer pool. Link https://blueprints.launchpad.net/percona-patches/+spec/multiple-lru-patch
– We are looking to include Waffle Grid into XtraDB releases with some additional features like caching buffer pool on SSD.
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