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By Elvis C. Foster, Shripad V. Godbole
Database platforms: a realistic procedure is a school room textbook to be used by means of scholars who're studying approximately relational databases, and the professors who train them. It discusses the database as an integral part of a software program method, in addition to a invaluable, challenge severe company source. The e-book is predicated on lecture notes which have been established and confirmed over numerous years, with impressive effects. It additionally exemplifies mastery of the means of combining and balancing thought with perform, to provide scholars their most sensible probability at good fortune. Upholding his target for brevity, accomplished assurance, and relevance, writer Elvis C. Foster's useful and methodical dialogue type will get immediately to the salient matters, and avoids pointless fluff in addition to an overkill of theoretical calculations.
The publication discusses innovations, ideas, layout, implementation, and administration problems with databases. every one bankruptcy is prepared systematically into short, reader-friendly sections, with itemization of the details to be remembered. It adopts a methodical and pragmatic method of fixing database structures difficulties. Diagrams and illustrations additionally sum up the salient issues to augment studying. also, the publication incorporates a variety of Foster's unique methodologies that upload readability and creativity to the database modeling and layout adventure whereas creating a novel contribution to the self-discipline. every thing combines to make Database platforms: a realistic technique an outstanding textbook for college kids, and a very good source on idea for the practitioner.
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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.