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You are required to write a report which evaluates two of the following issues in relation to your case study database: a. Security issues b. Performance issues c. Backup
Benefits and Limitations od Data Models?
Increased overheads on update : On the drawbacks side, it will need the system to ensure that all replicas of a relation are consistent. This shows that all the replicas of the rel
project on dbms
What are the properties in a relation ? In a relation Ordering of rows is immaterial and No two rows are identical.
Why did SAP introduce the extended star schema? Explain why it is reported to be better than the traditional schema model?
How many levels can be viewed in Architecture of the database ? Architecture of the database can be viewed as three levels.
What are the three data anomalies that are likely to occur as a result of data redundancy? Can data redundancy be completely eliminated in database approach? Why or why not? A
Explain Two phase locking protocol A transaction is consider as to follow the two-phase locking protocol if all locking operations precede the first unlock operation in the tra
What is the difference between WHERE and HAVING clauses?. Predicates in the WHERE clause applies to every tuple while the predicate in the HAVING clause applies to groups.
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