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A database to track your progress in your college program will track your progress towards graduation! A database that has information containing the classes that you have taken, c
Consider an information system designed for an online company which provides IT products and services These include desktops, laptops, networking products, IT books, parts, and
Implementation of association as an object Implement as a separate association object, independent of either class, as in Figure. An association object is a group of pairs
Write short notes on transaction state? A transaction may not always complete its implementation successfully such a transaction is termed aborted A transaction must be in o
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
Define a property that is not a property of transactions? Ans: Concurrency is not a property of transactions
What is called query processing? Query processing refers to the range of activities included in extracting data from a database.
Explain the Log Based Recovery Method? The system log that is generally written on stable storage consists of the redundant data required to recover from volatile storage failu
What is called mirroring? The simplest approach to introducing redundancy is to duplicate each disk. This method is called mirroring or shadowing.
" Wound-wait" scheme : It is based on a preemptive method. It is based on a simple rule: If Ti requests a database resource that is held by Tj
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