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Selective replication: This is a combination of generating small fragments of relation and replicating them rather than a entire relation. The data should be fragmented on require basis of several sites, as per the frequency of use, or else data is kept at a centralised site. The aim of this strategy is to have just the benefits of the other approach but none of the drawbacks. This is the most commonly used strategy as it gives flexibility.
Examples:- Hierarchical Model: It tells data as and relationships by hierarchy of data values. Figure illustrates an example of hierarchical model. Now a day's these models are
What is a shadow copy scheme? It is simple, but efficient, scheme known as the shadow copy schemes. It is based on making copies of the database called shadow copies that singl
Can a domain, assigned to a data element be changed? Yes. We can do so by just overwriting the entry in the field domain.
Run the following queries. For each query show 1) What you expect the output to be based upon the data 2) the SQL code and 3) the output running the query in Oracle. 1. Show all c
In Oracle what is system global area and how is it organized? The SGA is a collection of shared memory fields which along with the Oracle processes constitute an Oracle instan
What are the benefits of document scanning? Document scanning, in addition to being cost-efficient, also enhances productivity. This service enhances security as you set the pa
Consider an information system designed for an online company which provides IT products and services These include desktops, laptops, networking products, IT books, parts, and
How to reduce data redundency
Problem: a) Briefly describe what you understand by Client-Server environment b) The File Server is a simple form of Client-Server. Describe the principles of the File Serve
Define raid? Briefly explain it? A range of disk organization methods, collectively called redundant arrays of independent disks (RAID) o Improvement of reliability throug
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