50 Tips and Tricks for MongoDB Developers - download pdf or read online

By Kristina Chodorow

ISBN-10: 1449304613

ISBN-13: 9781449304614

Getting all started with MongoDB is simple, yet when you start development functions with it, you'll face a few advanced matters. What are the tradeoffs among normalized and denormalized info? How do you deal with reproduction set failure and failover? This number of MongoDB advice, tips, and hacks is helping you get to the bottom of matters with every thing from program layout and implementation to information security and monitoring.

You get particular tips 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 purposes opposed to MongoDB
Optimization Tips: rushing up your functions
Data defense Tips: utilizing replication and journaling to maintain facts safe—without sacrificing an excessive amount of functionality
Administration Tips: the best way to configure MongoDB and hold it working easily

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Additional info for 50 Tips and Tricks for MongoDB Developers

Example text

Command, called getlasterror. Originally, it just described any errors that occurred in the last operation, but has branched out into giving all sorts of information about the write and providing a variety of safety-related options. To avoid any inadvertent read-your-last-write mistakes (see “Tip #50: Use a single connection to read your own writes” on page 51), getlasterror is stuck to the butt of a write request, essentially forcing the database to treat the write and getlasterror as a single request.

If a certain query above is more important than the others or will be run much more frequently, our index should favor that one. For example, suppose the first query is going to be run thousands of times more than the next two. ensureIndex({"y" : 1, "z" : 1, "x" : 1}) The the first query will be as highly optimized as possible and the next two will use the index for part of the query. ensureIndex({"y" : 1, "w" : 1, "z" : 1}) Then all three will be able to use the index for the y criteria, the second two will be able to use it for w, and the middle one will be able to fully use the index.

RunCommand({"getlasterror" : 1, "w" : 2}) But what if one of your secondaries is down? MongoDB doesn’t sanity-check the number of secondaries you put: it’ll happily wait until it can replicate to 2, 20, or 200 slaves (if that’s what w was). info Thus, you should always run getlasterror with the wtimeout option set to a sensible value for your application. wtimeout gives the number of milliseconds to wait for slaves to report back and then fails. runCommand({"getlasterror" : 1, "w" : 2, "wtimeout" : 100}) Note that MongoDB applies replicated operations in order: if you do writes A, B, and C on the master, these will be replicated to the slave as A, then B, then C.

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50 Tips and Tricks for MongoDB Developers by Kristina Chodorow

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