In my hobby work on house information/house automation for our house I needed somewhere to store all the most recent data collected from various sensors and systems, in such a way that it would be accessible from any computer on our extended network. And I chose to use Memcached - as it is running purely in memory, and by its very nature is fast and accessible over the network.
It's data is not persistent after a crash - but I had no need for this, as I collect data very frequently, and persistence was not needed.
Here is a recent output from a dump of data stored in memcached :

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