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Here's a quick tip from the official MongoDB blog. In MongoDB 2.2, the 10gen team added a touch command that loads data from the data storage layer into memory. . .
MONGODB TIP: THE TOUCH COMMAND
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.
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MONGODB TIP: THE TOUCH COMMAND
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