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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.
What is conceptual schema? The schemas at the view level are known as subschema that describe dissimilar views of the database.
Example RELATION SCHEMA for STUDENT: STUDENT (Roll No: string, name: string, login: string, age: integer) RELATION INSTANCE
average response time?
What is the aim of object design The aim of object design is to identify object which the system contains and the interactions among them. The system implements specification
What are the basic objects of the data dictionary? Tables Domains Data elements Structures Foreign Keys
basic structure of xml
What is meant by the degree of relationship set? The degree of relationship type is the number of participating entity types.
How external/conceptual mapping and conceptual /internal mapping is performed
Define Shared locks? Ans: Shared lock: Throughout concurrent execution of transactions, earlier than a transaction can access a data item, it has to obtain a lock on it. Now he
Question 1 Explain the 10 reasons to use MySQL Question 2 Write the SQL statements to demonstrate the following using SELECT command Expression Evaluation ORDER BY
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