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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.
What is object identity? An object retains its identity even if some or all the values of variables or explanations of methods change overtime.
Illustrate the statement 'Projection operation distributes over the union operation'. Give an example. Ans: Π L (E 1 ∪ E 2 ) = (Π L (E 1 )) ∪ (Π L (E 2 )) This says th
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
What is the meaning of Data Independence ?
Construct an ER diagram for a hospital along with a set of patients and a set of medical doctors Associate with every patient a log of the several tests and examinations conducted.
XYZ is a large chain of home entertainment rental over 100 stores distributed over all states in Australia. XYZ lends entertainment products such as movies, TV shows and games on v
How can Redundant Associations be done It can be done by asking questions: i) Is there a specific arrangement of network which would optimize critical aspects of completed
What is relationship? Give examples A relationship is an association between several entities. Example: A depositor relationship associates a customer with every account tha
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An entity set that does not have sufficient attributes to form a primary key is called? An entity set that doesn't have sufficient attribute to form a primary key is known as w
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