Download PDF by Kristina Chodorow: 50 Tips and Tricks for MongoDB Developers

By Kristina Chodorow

ISBN-10: 1449304613

ISBN-13: 9781449304614

Getting all started with MongoDB is straightforward, yet when you start construction functions with it, you'll face a few advanced concerns. What are the tradeoffs among normalized and denormalized info? How do you deal with copy set failure and failover? This selection of MongoDB guidance, methods, and hacks is helping you get to the bottom of concerns with every thing from program layout and implementation to info safeguard and monitoring.

You get particular advice in 5 subject parts without delay from engineers at 10gen, the corporate that develops and helps this open resource database:
Application layout Tips: What to bear in mind whilst designing your schema
Implementation Tips: Programming purposes opposed to MongoDB
Optimization Tips: rushing up your functions
Data protection 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 preserve it operating easily

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Info Figure 4-1. A primary (P), secondary (S), and backup server run with journaling (B). Figure 4-2. A primary (P), two secondaries (S), one slave-delayed backup, and a journaled backup (B). Tip #31: Do not depend on repair to recover data If your database crashes and you were not running with --journal, do not use that server’s data as-is. It might seem fine for weeks until you suddenly access a corrupt document which causes your application to go screwy. Or your indexes might be messed up so you only get partial results back from the database.

This is important for several reasons. First, queryability: strings do not match ObjectIds and ObjectIds do not match strings. info automatically extract the date a document was created from its ObjectId. Finally, the string representation of an ObjectId is more than twice the size, on disk, as an ObjectId. Tip #15: Override _id when you have your own simple, unique id If your data doesn’t have a naturally occurring unique field (often the case), go ahead and use the default ObjectId for _ids. However, if your data does have a unique field and you don’t need the properties of an ObjectId, then go ahead and override the default _id—use your own unique value.

9, but it is currently harmless but noisy. Tip #47: Get “help” for any function JavaScript lets you see the source code for most of the functions you run in the shell. If you’re curious as to what arguments a function takes or can’t remember what it returns, you can see the source by running the function name, without parentheses. save(u); We can see immediately that we give it a username, password, and that there’s a readOnly option (to create a user who can only read from the given database).

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50 Tips and Tricks for MongoDB Developers by Kristina Chodorow

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