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Whst is logical schema ?
Logical schema is the entire database.
what are the topics in data management
please describe the data base management with the easy example &give the application?
read-set(T) : Each data items that are read by a transaction T Timestamps : for all transaction T, the start-time and the end time are reserved for all the three phases.
Removing a Synonym: DROP SYNONYM D30;
Define an abstraction by which relationships are treated as higher level entities Ans: Aggregation. It is an abstraction by which relationships are treated as higher level
what is bogus empowerment. And what is genuine empowerment
Representing complex relationship among data A database may contain varieties of data interrelated to each other in numerous ways. A DBMS must have the capability to represent
FDs in Relationships: Enrols Relationship: None as it is many to many Teaches Relationship : Course code → Instructor Instructor → Course code The next question is:
How persistent programming languages differ from traditional programming languages? Database languages vary from traditional programming languages in that they directly manipul
Atomicity: It describes a transaction to be a one unit of processing. We can also say either a transaction will be finished completely or not at all. In the transaction example 1
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