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What are the physical characteristics of magnetic disks?
Ans: A magnetic disk is a circular plate or platter of plastic or metal that is coated with magnetizable material like iron-oxide on both sides. Data are recorded on the disk surface in the type of tiny invisible magnetized spots (denoting 1s) or non-magnetized spots (denoting 0s). A conducting coil, named as Head, carries out the job of reading and writing on the surface of magnetic disk. Usually, the head remains stationary whereas the disk rotates below it for reading or writing operation. The surface of the disk is categorized into a number of concentric circles known as tracks. Number of tracks alters from disk to disk. Each track is further sub categorized into sectors. Every sector of a disk is assigned a unique number. Each sector having similar capacity.
Explain retrieval in QBE? Retrieval in QBE : A "GUI" for expressing queries. Based on the Domain Relational Calculus (DRC) Actually invented before GUIs. Very co
Failures and Recovery In practice various things might occur to prevent a transaction from completing. Recovery methods are used to bring database, which does not satisfy consi
complete er diagram of textile industry management
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
Drawbacks of Database systems ?
You are to write a property management database program that allows a real estate agent to view, add, search, and save property listings. The program is to do the following: 1.
Differentiate sub-class and super-class? The specialization of a class is known as subclasses.eg: employee is a subclass of person and teller is a subclass of employee. Convers
tell me the functionality,advantages and disadvantages of student database
Explain Thomas' Write rule. Show how it is different from timestamp ordering protol Ans: In timestamp-based concurrency control the thomas Write rule is a rule. Given a Timest
Explain in details about the f unctions of DBA ?
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