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Update Operations and Dealing with Constraint Violations
There are three basic operations to be executes on relations:
The INSERT Operation:
The insert operation permits us to insert a new tuple in a relation. When we try to insert a new record, then any of the following four types of constraints can be violated:
• Entity Integrity constraint: If the primary key attribute value of new tuple t is given as null.
Define check point and its impact on data base recovery. Ans: There could be hundreds of transactions handled per minute, in a large on-line database system.
What are the three data anomalies that are similarly to take place as a result of data redundancy? Can data redundancy be completely eliminated in database approach? Why or why n
What does the extract statement do in extract datasets? The data is written to virtual memory by extract commands.
What is meant by heuristic optimisation?Discuss the major heuristics that are applied during query optimisation.
Create centralized relational database using Top down method- Construction of Logical Model: Translation EERD into Relational Schema: Use the 8 steps algorithm of converting EERD
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Explain how the associations are implemented as classes. A general approach in this case is to transform an association class into a simple class linked to two original classes
The Incident table, with an auto-incrementing incident number, etc, looks like: incident_num reporter date time incide
Soccer player ER Diagram to Relational database schema
Desirable Properties Of Decomposition Decomposition is a process of dividing a relation into its projections that will not be disjoint. Please remind the Relational projection
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