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Drawbacks of Data Distribution:The primary drawbacks of distributed database systems are the added complexity needed to ensure proper coordination between the sites. This increased difficulty takes the form of:
Higher Software development cost: Distributed database systems are difficult to execute and, therefore, more costly. Increased difficulty implies that we can expect the procurement and maintenance costs for a DDBMS to be higher than those for a centralised DBMS. In addition to software, a distributed DBMS needs additional hardware to establish a network among sites. There are ongoing communication costs incurred with the use of this network. There are also additional maintenance costs to handle and manage the local DBMSs and the network.
Data Base Management System 1. Draw the Architecture of MySQL and explain about its subsystems briefly. 2. Elaborate with the help of an example the concept of Primary key a
give some example real-life situations where DBMS are most suiitabe
When a function module is activated syntax checking is performed automatically. YEs, a function module is activated syntax checking.
define locking in simple language and decribed it
Replicating Data One approach that may support efficient access to dissimilar applications as above may be to give access to every of the applications from dissimilar replicate
each publisher has uniqe name a mial addrs are also kept on each pubisher.a publisher publish one book.a book publish y one publisher.book identified by isbn.each book writn by one
Unrepeatable reads : Assume T7 reads X twice during its implementation. If it did not update X itself it could be very disturbing to see a dissimilar value of X in its next read. B
Explain the steps for reduction of E-R model into relational model. Ans:(a) Entity set in E-R model will be considered as table name in relational Model. (b) Attributes of e
What is Object Oriented model? This model is based on collection of objects. An object has values stored in instance variables with in the object. An object also having bodies
You are managing the following database system: • DBMS: Oracle 11g • OS: Sun Solaris • System architecture: Web-based application using ASP.Net • Purpose of Server: HR managem
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