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What do you understand by RAID? Explain RAID Level 4 and Level5?
RAID - It is stands for Redundant Array of Inexpensive Disks (as named by the inventor), or alternatively Redundant Array of Independent Disks (a less relative name, and therefore now the commonly accepted one) - is a technology which employs the simultaneous use of two or more hard disk drives to achieve greater stages of performance, reliability, and/or larger data volume sizes.
RAID Level 4: In this setup, files can be distributed among multiple disks. Each disk operates independently that permits I/O requests to be performed in parallel, by data transfer speeds can suffer due to the kind of parity. The error detection is achieved through dedicated parity and is stored within a separate, single disk unit.
RAID Level 5: Distributed parity needs all drives but one to be present to operate; drive failure needs replacement, but the array is not destroyed through a single drive failure. Upon drive failure, any subsequent reads can be computed from the distributed parity such in which the drive failure is masked from the end user. The array will have data loss in the event of a second drive failure and is vulnerable until the data in which was on the failed drive is rebuilt onto a replacement drive
what are the main characteristics of database
what would go in order patient#, patient name, patien address, surgeon#, surgeon name, surgery date, surgery type, drug admin
BCNF Boyce-Codd Normal Form A relation schema R is in BCNF if it is in 3NF and accepts an additional constraint that for every FD X A, X has to be a candidate key. If a relati
Describe the four main ways of optimising disk block access. Ans: a. Disk b. Non-volatile writes buffers c. File organization (Clustering) d. Log-based file system
Question : (a) Data mining is one of the best ways to analyse data and using software method, hidden and unexpected patterns and relationships in sets of data can be extracte
Define multivalued dependency. What do understand by trivial multivalued dependency? Ans: A multivalued dependency is a full constraint among two sets of attributes in a rela
What is NULL? Simply NULL means not in value.
Explain the concepts of relational data model? Relational Data Model - The relational model was first introduced through Prof. E.F. Codd of the IBM Research in the year 1970
#Use the following database schema: 1) Patient—PatientID, Name, DOB 2) Doctor—DoctorID, Name, MedLicenseNumber, Phone 3) Medication—MedicationID, BrandName, GenericName 4) Prescrip
For this application, we will consider IBM DB2 catalog data (i.e., metadata) for IBM's enterprise-class servers running the z/OS (formerly OS/390 or MVS) operating system. One of
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