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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.
Should I select imaging software that allows changes? An imaging system should not give features to edit or alter images. Images generally are formed as safe and secure records
How can Redundant Associations be done It can be done by asking questions: i) Is there a specific arrangement of network which would optimize critical aspects of completed
Atomicity: It describes a transaction to be a one unit of processing. We can also say either a transaction will be finished completely or not at all. In the transaction example 1
Give two profit of Reuse of Code. Reusing the implementation . Place existing class directly inside a new class. The new class can be made up of any number and type of the oth
It defines that no primary key value can be null. This is as the primary key is used to recognize individual tuple in the relation. So we will not be able to recognize the records
What are uncommitted modifications? The immediate-modification technique permits database modifications to be output to the database whereas the transaction is still in the act
What do you mean by persistence? How you will make your data persistent? Persistent data is the data, which has a longer lifetime than program which has created it. Enabling th
Describe the candidate key functions ? Candidate Key and Alternate Key: In some instances, an entity will have more than one attribute which can serve as a primary key. Any key
Update Operations and Dealing with Constraint Violations There are three basic operations to be executes on relations: Insertion Deletion Update The INSER
Improved availability: The data in a distributed system may be replicated so that it is at more than one site. Thus, the failure of a node or a communication link does not necessar
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