By Kristina Chodorow
Getting begun with MongoDB is straightforward, yet when you start development purposes with it, you'll face a few complicated matters. What are the tradeoffs among normalized and denormalized information? How do you deal with reproduction set failure and failover? This selection of MongoDB suggestions, tips, and hacks is helping you unravel matters with every little thing from program layout and implementation to info safeguard and monitoring.
You get particular counsel in 5 subject parts at once from engineers at 10gen, the corporate that develops and helps this open resource database:
• Application layout Tips: What to remember whilst designing your schema
• Implementation Tips: Programming functions opposed to MongoDB
• Optimization Tips: dashing up your purposes
• Data security Tips: utilizing replication and journaling to maintain info safe—without sacrificing an excessive amount of functionality
• Administration Tips: the right way to configure MongoDB and maintain it working easily
Read Online or Download 50 Tips and Tricks for MongoDB Developers PDF
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Additional resources for 50 Tips and Tricks for MongoDB Developers
Thus, reading off of disk takes a really long time in computing terms. On Linux, you can measure sequential disk access on your machine by running sudo hdparm -t /dev/hdwhatever. This doesn’t give you an exact measure, as MongoDB will be doing non-sequential reads and writes, but it’s interesting to see what your machine can do. So, what can be done about this? info Use SSDs SSDs (solid state drives) are much faster than spinning hard disks for many things, but they are often smaller, more expensive, are difficult to securely erase, and still do not come close to the speed at which you can read from memory.
Once you have a dump you have to restore it to ny1: 1. 2. 3. 4. Shut down the mongod running on ny1. , take an EBS snapshot), just in case. Delete the data files on ny1. Restart the (now empty) ny1. If it was part of a replica set, start it up on a different port and without --replSet, so that it (and the rest of the set) doesn’t get confused. info ny2$ mongorestore --host ny1 --port 10000 # specify port if it's not 27017 Now ny1 will have a compacted form of the database files and you can restart it with its normal options.
Then the request might already be being processed by the database, so you wouldn’t want to send it a second time. info This is a tricky problem that is often application-dependent, so the drivers punt on the issue. You must catch whatever exception is thrown on network errors (you should be able to find info about how to do this in your driver’s documentation). Handle the exception and then figure out on a request-by-request basis: do you want to resend the message? Do you need to check state on the database first?
50 Tips and Tricks for MongoDB Developers by Kristina Chodorow