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What is a disjoint less constraint?
Ans: It needs that an entity belongs to no much more than one level entity set.
Disjoint less constraint needs that an entity belongs to no more than one level entity set. (the meaning of Disjoint less constraint is that an entity can be a member of at most one of the subclasses of the specialization.)
Implementation and SQL Applications
What is multiple relationship ?
Assume you are given a uniprocessor system with one gigabyte of memory and a 300 gigabyte disk. The OS on the machine has a demand paged virtual memory system with a local page rep
How does a query tree represent a relational algebra expression? Discuss any three rules for query optimisation, giving example as to when should each rule be applied. Ans
notes about update opreation
When It is better to use files than a DBMS? It is better to use files than a DBMS when Multiple users wish to access the data.
Your OS has a set of queues, each of which is protected by a lock. To enqueue or dequeue an item, a thread must hold the lock associated to the queue. You need to implement an a
What is the used of specifying alias? Specifying alias: is used to rename column or attribute in a table.
What are the aggregate objects in the data dictionary? Views Match codes Lock objects.
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