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By J. Chris Anderson, Jan Lehnardt, Noah Slater
Three of CouchDB's creators assist you to use this document-oriented database as a standalone program framework or with high-volume, allotted functions. With its basic version for storing, processing, and having access to facts, CouchDB is perfect for net functions that deal with large quantities of loosely dependent facts. That on my own could stretch the bounds of a relational database, but CouchDB deals an open resource resolution that's trustworthy, scales simply, and responds fast.
CouchDB works with self-contained info that has unfastened or ad-hoc connections. It's a version that matches many real-world goods, similar to contacts, invoices, and receipts, yet you'll detect that this database can simply deal with facts of any style. With this e-book, you'll how you can paintings with CouchDB via its RESTful net interface, and get to grips with key good points akin to basic record CRUD (create, learn, replace, delete), complicated MapReduce, deployment tuning, and extra. * comprehend the fundamentals of document-oriented garage and manipulation * have interaction with CouchDB fullyyt even though HTTP utilizing its RESTful interface * version info as self-contained JSON files * deal with evolving facts schemas clearly * question and combination facts in CouchDB utilizing MapReduce perspectives * reflect information among nodes * music CouchDB for elevated functionality and reliability
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Extra resources for CouchDB: The Definitive Guide: Time to Relax
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The revision number is the md5 hash of the transport representation of a document with an N- prefix denoting the number of times a document got updated. This is useful for replication. See Chapter 17 for more information. There are multiple reasons why CouchDB uses this revision system, which is also called Multi-Version Concurrency Control (MVCC). They all work hand-in-hand, and this is a good opportunity to explain some of them. One of the aspects of the HTTP protocol that CouchDB uses is that it is stateless.
Yes, conceptually, an Etag is the same as a CouchDB document revision number, and it shouldn’t come as a surprise that CouchDB uses revision numbers for Etags. Etags are useful for caching infrastructures. We’ll learn how to use them in Chapter 8. Attachments CouchDB documents can have attachments just like an email message can have attachments. An attachment is identified by a name and includes its MIME type (or Content-Type) and the number of bytes the attachment contains. Attachments can be any data.
The network is reliable. Latency is zero. Bandwidth is infinite. The network is secure. Topology doesn’t change. There is one administrator. Transport cost is zero. The network is homogeneous. Existing tools often try to hide the fact that there is a network and that any or all of the previous conditions don’t exist for a particular system. This usually results in fatal error scenarios when something finally goes wrong. In contrast, CouchDB doesn’t try to hide the network; it just handles errors gracefully and lets you know when actions on your end are required.