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Explain briefly concurrent task by taking an example.
Concurrent Task- The concurrent occurrence of more than one event is called concurrent task. Operating systems can handle concurrent tasks capably. The Air Traffic Control system (ATC) for examples, can manage simultaneous tasks in fractions of a second.
Whst is logical schema ? Logical schema is the entire database.
What is transaction? Collections of operations that form a single logical unit of work are known as transactions.
what is query processing?
we need example of 2phase locking
What subschema expresses ? A subschema expresses the external view. (External schemas are called also called as subschemas)
Q. Describe how an ER schema can be represented by relation schemas and constraints arising from ER design can be mapped to constraints on a relation schema. The entity rela
What is the purpose of storage manager? The storage manager is responsible for the following a) Interaction with the file manager b) Translation of DML commands in to low
What is a view? How it is related to data independence? A view might be thought of as a virtual table, that is, a table that does not really exist in its own right but is inste
Benefits and limitations
Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
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