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Chapter 25: Problem 5

Why is data replication useful in DDBMSs? What typical units of data are replicated?

Short Answer

Expert verified
Data replication is useful in Distributed Database Management Systems (DDBMS) for improving data availability, reliability, and system performance. The typical units of data that are usually replicated are records, tables, and databases.

Step by step solution

01

Understand the concept of data replication

Data replication is a method in database systems where the same data is stored in multiple locations to increase data availability and reliability. It's often used in DDBMSs which are systems where the database is spread across different network sites.
02

Explain the usefulness of data replication in DDBMSs

One of the major advantages and reasons for using data replication in DDBMSs is data availability. When data is replicated and stored on different network sites, users can access the data even if one of the sites is down. Another advantage is improved reliability. If data gets corrupted at one site, it can be retrieved from another site where it has been replicated. Also, data replication can enhance system performance. When data is replicated closer to the users, they can retrieve it faster.
03

Identify the typical units of data that are replicated

The typical units of data that are replicated in DDBMS are records, tables, and databases. Records are individual entries in a database, tables are a collection of related data held in a structured format within a database, and databases house all the tables, views, indexes, and other objects.

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Most popular questions from this chapter

Discuss what is meant by the following terms: degree of homogeneity of a DDBMS, degree of local autonomy of a DDBMS, federated DBMS, distribution transparency, fragmentation transparency, replication transparency, multidatabase system.

Discuss the semijoin method for executing an equijoin of two files located at different sites. Under what conditions is an equijoin strategy efficient?

What are the main reasons for and potential advantages of distributed databases?

Compare the primary site method with the primary copy method for distributed concurrency control. How does the use of backup sites affect each?

Discuss the different techniques for executing an equijoin of two files located at different sites. What main factors affect the cost of data transfer?
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