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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.
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
.#question. Discuss the problem which may arise during concurrency control and recovery in distributed database which are not encountered in controlized database environment.
Design a database for an airline.The database must keep track of customers and their reservations,flights and their status, seat assignment on individual flights and, the schedule
You will be analysing a set of financial data of your choice. It is not necessary to collect any primary data of your own, and publicly available secondary data will be sufficient
What are ways of finding out either an update is required or not for derived attributes? The ways to find out an update is required or, not are as: Explicit update
Describe the tools that are available for managing MySQL Server. Given below are the tools to manage MySQL server: mysqld - MySQL server daemon. This is used to begain t
#quCreate a database design specification (Enhanced Entity Relationship Diagram (EERD) and Relational Data Model (RDM)) from the given business description. The RDM must be in 3rd
What are the types of storage devices? Primary storage Secondary storage Tertiary storage Volatile storage Nonvolatile storage
What are partial, alternate,, artificial, compound and natural key? Partial Key: It is a set of attributes that can uniquely recognize weak entities and that are related to s
Give the two reasons for allowing concurrency
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