Published at DZone with permission of its author, Eric Genesky. (source)
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. . .
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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