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Types of data independence
Data independence can be classified into the following two types:
Physical Data Independence: This means that for any change made in the physical schema, the requirement to change the logical schema is minimal. This is practically simpler to achieve.
Logical Data Independence: This means that for any change made in the logical schema, the requirement to change the external schema is minimal. As we shall see, this is a little complex to achieve.
Explain cursors in SQL? Cursors in SQL - An object used to store the output of a query for row-through-row processing through the application programs. Cursors are constructs
Define the phases of two phase locking protocol Growing phase: a transaction may get locks but not release any lock. Shrinking phase: a transaction might be release locks bu
Section A: Use the following tables to create a database called College. Use SQL commands. Student stuid(primary) lastName firstName
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What type of view of total database content? Data base content Conceptual view of total database contain.
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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
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