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Define Two phase commit Two phase commit: To make sure atomicity, all the sites where a transaction is being executed must agree on the final outcome of the execution. The tran
Chapter 10a review questions
Cardinality of Relationship One-to-One Only one entity of the first set is linked to only one entity of the second set. E.g. A teacher teaches a student. Only one teacher
What does the extract statement do in extract datasets? The data is written to virtual memory by extract commands.
How to draw an ER diagram to a finance companz
Object-oriented decompositions Object-oriented decompositions of systems better are able to cope with change. Each subsystem has a well-defined interface which communicates with
Explain the Weak Entity Set An Entity set which does not have sufficient attribute to make a primay key is known as weak entity set. For instance, dependents of an employee in
Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
Define physical image of a global relation at a site
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