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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 categories of SQL command? SQL commands are separated in to the following categories: 1. Data - Definitition Language 2. Data Manipulation language 3. Dat
Improved performance: As the data is located near the site of its demand, and given the inherent parallelism because of multiple copies, speed of database access may be good for di
Differentiate between a unique key and a primary key. - By default, clustered index on column are created by primary key while nonclustered index are created by unique key.
What is the meaning of Recovery? In deferred update methods, if a transaction fails before arriving its commit point, it will not have altered the database in any way, so UNDO
What is the use of group by clause? Group by clause is used to apply aggregate functions to a set of tuples. The attributes given in the group by clause are used to
Define physical image of a global relation at a site
What are the parts of SQL language? The SQL language has various parts: data - definitition language Data manipulation language View definition Transaction contr
1 - Serial RS232 comm port comunication 2 - NanoHTTPD serving a few processed pages 3 - System tray application to indicate status and access configuration forms 4 - SQLit
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I need to Map an E-R diagram to a relational schema
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