http://blog.ronnyegner-consulting.de/2011/10/13/info-task-blocked-for-more-than-120-seconds/
By default Linux uses up to 40% of the available memory for file system caching.
You can lower the mark for flushing the cache from 40% to 10% by setting “vm.dirty_ratio=10″ in /etc/sysctl.conf.
New Training Deep Dives: Handling Oracle Optimizer, Partitioning and
I/O-Intensive Databases
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If you want to end the year by learning something practical and new, this
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