Where Is Your Data Cached (And Where Should It Be Cached)?

Sarah Novotny (Google)

Taking a look at the many layers of caching in the modern webstack can lead to some interesting optimizations. We know that raid card caches, disk caches and CPU caches all exist at the hardware level, but how do they interact with database caching, application code caching and rendered page caching. Where are the redundancies and where is the most optimal location for your services to cache? Are you risking data integrity by using both disk and raid card caching? Is there a similar risk in using both filesystem and database caching? These are hard won lessons if you have to learn them during an outage. they can be avoided with some forethought and benchmarking. I’ll call out the many layers where data is cached and talk about some of the risks and potential performance gains that we’ve found by selectively disabling and adding particular caching layers.

Photo of Sarah Novotny

Sarah Novotny

Google

I’m a founding partner of Blue Gecko. I speak and write about Open Databases / LAMP practice. For 10 years I managed and was a senior administrator in the LAMP group. Blue Gecko does remote administration and management of databases around the world.

I additionally am co-chair for OSCON 2001 and run the Seattle meetup for MySQL and one focused on Opensource technologies and culture.

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Shirley Bailes
06/15/2011 8:22am PDT

@derek: Yes, and replaced.

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Derek Chang
06/15/2011 8:20am PDT

is this session cancelled?

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