CouchDB: The Definitive Guide: Time to Relax by J. Chris Anderson, Jan Lehnardt, Noah Slater

By J. Chris Anderson, Jan Lehnardt, Noah Slater

Three of CouchDB's creators enable you use this document-oriented database as a standalone software framework or with high-volume, dispensed purposes. With its easy version for storing, processing, and getting access to info, CouchDB is perfect for internet functions that deal with large quantities of loosely based information. That on my own could stretch the bounds of a relational database, but CouchDB deals an open resource answer that's trustworthy, scales simply, and responds quick.
CouchDB works with self-contained info that has unfastened or ad-hoc connections. It's a version that matches many real-world goods, akin to contacts, invoices, and receipts, yet you'll detect that this database can simply deal with facts of any style. With this booklet, you'll the way to paintings with CouchDB via its RESTful net interface, and get to grips with key positive factors resembling uncomplicated record CRUD (create, learn, replace, delete), complex MapReduce, deployment tuning, and extra. * comprehend the fundamentals of document-oriented garage and manipulation * engage with CouchDB completely although HTTP utilizing its RESTful interface * version information as self-contained JSON files * deal with evolving info schemas certainly * question and combination facts in CouchDB utilizing MapReduce perspectives * mirror facts among nodes * song CouchDB for elevated functionality and reliability

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Extra info for CouchDB: The Definitive Guide: Time to Relax

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When talking to CouchDB you need to make requests. Making a request includes opening a network connection to CouchDB, exchanging bytes, and closing the connection. This is done every time you make a request. Other protocols allow you to open a connection, exchange bytes, keep the connection open, exchange more bytes later—maybe depending on the bytes you exchanged at the beginning— and eventually close the connection. Holding a connection open for later use requires the server to do extra work.

Fortunately, CouchDB provides a powerful way to perform per-document validation from within the database. CouchDB can validate documents using JavaScript functions similar to those used for MapReduce. Each time you try to modify a document, CouchDB will pass the validation function a copy of the existing document, a copy of the new document, and a collection of additional information, such as user authentication details. The validation function now has the opportunity to approve or deny the update.

If you send Accept: application/json in your request, CouchDB knows that you can deal with a pure JSON response with the proper ContentType header and will use it instead of text/plain. < Content-Length: 12 The Content-Length header simply tells us how many bytes the response body has. < Cache-Control: must-revalidate This Cache-Control header tells you, or any proxy server between CouchDB and you, not to cache this response. < This empty line tells us we’re done with the response headers and what follows now is the response body.

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