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MongoDB Touch Command

MongoDB 2.2 introduced thetouch command, which loads data from the data storage layer into memory. The touch command will load a collection’s documents, indexes or both into memory. This can be ideal to preheat a newly started server, in order to avoid page faults and slow performance once the server is brought into production. You can also use this when adding a new secondary to an existing replica set to ensure speedy subsequent reads.

I could see how this command could be useful for a caching system, but I haven’t seen it in any database. It’s probably a workaround for the memory mapped files mechanism used by MongoDB’s persistence.

Original title and link: MongoDB Touch Command (NoSQL database©myNoSQL)

via: http://blog.mongodb.org/post/44706549534/mongodb-tip-the-touch-command