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Objectives
Due date for May 8
Benefits of heap files 1. This is a easy file Organisation method. 2. Insertion is somehow capable. 3. Good for bulk-loading data into a table. 4. Best if file
Transactions And Concurrency Management Introduction One of the main benefits of storing data in an integrated repository or a database is to permit sharing of it betwee
What is a primary key? Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.
What is the main difference between read-only and update methods? A read-only method does not affect the values of a variable in an object, whereas an update method may alter t
What subschema expresses ? A subschema expresses the external view. (External schemas are called also called as subschemas)
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 handl
Dependency Preservation It is obvious that the decomposition must be lossless so that we do not lose any information from the relation that is decomposed. Dependency preservati
explain the mapping constraints
Define object-relational systems? Systems that give object-oriented extensions to relational systems are known as object-relational systems.
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