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Name four motivating factors for database designers and other IT professionals to develop and use NoSQL databases. 6 (June 1970). com/articles/timeline-ofdatabase-history. Reading, MA: Addison-Wesley, 2007. Reading, MA: Addison-Wesley, 2007. 1). 1 Single server versus distributed system. Much of what is discussed in the following section on distributed systems does not apply if you run your NoSQL database on a single server. A common way to meet these needs is by designing data management systems to work across multiple servers, that is, as a distributed system.

Programs designed to work with the original file format would start reading the customer address at character 51, which is now part of the customer name. In this scenario, the easiest solution may be to have two copies of the employee file: one with salary data and one without. One file will have the employee’s new address while the other file will contain the employee’s old address. To summarize, the limitations of flat file data management systems include the following: • It is inefficient to access data in any way other than by the way data is organized in the file; for example, by customer ID.

You will also learn about limitations of distributed systems, with particular attention to balancing consistency, availability, and protection for network failures that leaves some servers in a cluster unreachable. 2. 2 Persistently stored data is stored on disk, flash, or other long-term storage medium. Data stored on a flash device is read directly from its storage location. The movable parts of the disk and tape drives are put in position so that the read heads of the device are over the block of data to be read.

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NoSQL for Mere Mortals by Dan Sullivan

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