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Posted by / 10-Aug-2017 18:46

Database replication becomes difficult when it scales up.

Usually, the scale up goes with two dimensions, horizontal and vertical: horizontal scale-up has more data replicas, vertical scale-up has data replicas located further away in distance.

For well over 15 years, Bit Torrent has been the leading technology to deliver large files over the Internet.

executed on separate devices, or it could be replicated in time, if it is executed repeatedly on a single device. When you sign in to comment, IBM will provide your email, first name and last name to DISQUS.That information, along with your comments, will be governed by DISQUS’ privacy policy.But the underlying needs are the same in both cases: by ensuring that the replicas see the same events in equivalent orders, they stay in consistent states and hence any replica can respond to queries.A number of widely cited models exist for data replication, each having its own properties and performance: Database replication can be used on many database management systems, usually with a master/slave relationship between the original and the copies.

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Also, in a failure scenario, a failover of replicas is hidden as much as possible.