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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 a recovery scheme? An integral part of a database system is a recovery scheme that can restore the database to the reliable state that existed before the failure.
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What is a heterogeneous distributed database? In a heterogeneous distributed database, dissimilar sites may use different schemas, and dissimilar dbms s/w. The sites may not be
What are views? Explain how views are different from tables? A view in SQL terminology is a one table in which is derived from other tables. These other tables could be base t
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What is the difference between a key and a superkey? Key - A key a single attribute or a combination of two or more attributes of an entity set which is used to identify one
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Serialisable Schedules: If the processes of two transactions conflict with each other, how to verify that no concurrency related problems have happened? For this, serialisability t
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