Page 39 - FUNDAMENTALS OF COMPUTER

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NPP Computer Basics and Windows Fundamentals 39

supply web pages to another computer called noO àXmZ H$aZo H$m H$m_ H$aVm h¡Ÿ& {Og H$åß`yQ>a H$mo do~
web client. Large number of clients can request
the same web server. The web server is so noO àXmZ {H$E OmVo h¢, Cgo do~ ŠcmB§Q> H$hVo h¢Ÿ& EH$
powerful computer that it provides services to gd©a H$mo EH$ hr g_` _| H$B© ŠcmB§Q> {ZdoXZ ^oOVo h¢Ÿ&
many Clients, at a time. The servers are also AV: do~ gd©a EH$ e{º$emcr H$åß`yQ>a hmoVm h¡ Omo BZ g~
named after the running protocol. e.g., HTTP
server running Hypertext Transfer Protocol to ŠcmB§Q> H$mo EH$ gmW gwZVm h¡Ÿ& BZH$mo H$^r-H$^r àmoQ>moH$m°c
transfer web pages, SMTP (Simple Mail Transfer Ho$ Zm_ go ^r nwH$maVo h¢Ÿ& O¡go HTTP- gd©a, FTP-
Protocol) Server uses SMTP protocol to transfer
email messages and so on. gd©a, SMTP- gd©a Am{XŸ&
When a server is dedicated to run a specific O~ EH$ gd©a EH$ {deof AZwà`moJ hoVw g_{n©V hmoVm
application software, it is called Application h¡, Application server H$hcmVm h¡Ÿ& O~ H$moB© gd©a
Server. When a server is dedicated for database
related software, it is called Database Server. S>mQ>m~og go g§~§{YV H$m`© H$aVm h¡, Database server
When a server is used for sharing printers, H$hcmVm h¡Ÿ& O~ H$moB© gd©a {àÝQ>a H$mo eo`a H$aZo _| _XX
within a network, these are called Print Server. H$aVm h¡, Print server H$hcmVm h¡Ÿ& Omo gd©a Xygao
File servers, transfer files to other computers H$åß`yQ>am| Ho$ {ZdoXZ na \$mBc| àXmZ H$aVm h¡, File
on the network. A proxy server works as an ISP
server for a Local Area Network for the purpose server H$hcmVm h¡Ÿ& EH$ Proxy server {H$gr LAN _|
of running Internet connection. BÝQ>aZoQ> McmZo hoVw ISP server O¡gm H$m`© H$aVm h¡Ÿ&
1.13 Mainframe Computers 1.13 _oZ\«o$_ H$åß`yQ>a

These computers are large, general `o H$åß`yQ>a ~‹S>o, ì`mnH$ H$m`© H$aZo dmco H$åß`yQ>a
purpose, multiuser, multitasking computers, hmoVo h¢Ÿ& BZH$m Cn`moJ ~‹S>r g§ñWmAm| Ho$ {cE hmoVm h¡Ÿ& `o
mainly used by large organisations, for data
processing and complex calculations. e.g., H$åß`yQ>a AË`{YH$ S>mQ>m àmogoqgJ d JUZmË_H$ H$m`© Ho$
Mainframes are used for Industry and {cE H$m_ _| AmVo h¢Ÿ& O¡go- CÚmoJ _| gm§p»`H$s Ho$ Am±H$‹S>o
Consumer statistics, ERP Implementation and d Cn^moº$mAm| H$s OmZH$mar Am{X hoVw _oZ\«o$_ H$m Cn`moJ
transaction processing and financial {H$`m OmVm h¡Ÿ& ERP hoVw ^r _oZ\«o$_ H$s Amdí`H$Vm hmoVr
organisations. All mainframes have ability to h¡Ÿ& `o H$åß`yQ>a EH$ go A{YH$ Am°naoqQ>J {gñQ>_ Mcm
run multiple operating systems. Thus, it can be
supposed to be combination of multiple Virtual gH$Vo h¢Ÿ& AV: BZH$mo h_ H$B© Am^mgr H$åß`yQ>am| H$m
machines. They are used to handle a large g_yh _mZ gH$Vo h¢Ÿ& `o H$åß`yQ>a {H$gr ~‹S>r g§ñWm H$m
database of an organisation. Mainframe S>mQ>m~og à~§Y H$aZo Ho$ H$m_ _| AmVo h¢Ÿ& BZ_| g_mZm§Va
computer system uses parallel processing to àmogoqgJ H$m Cn`moJ H$aHo$ XúmVm ~‹T>mB© OmVr h¡Ÿ& BZH$mo
improve efficiency. Mainframes are eQ> S>mCZ {H$E {~Zm hr [ano`a `m AnJ«oS> {H$`m Om
continuously running systems in the sense that
they can be repaired or upgraded without being gH$Vm h¡Ÿ& AV: `o {~Zm éHo$ cJmVma McVo ahZo dmco
shut down. These are also fault tolerant system. H$åß`yQ>a h¢Ÿ& BÝh| \$m°ëQ>-Q>mca|Q> {gñQ>_ ^r H$hVo h¢Ÿ&
The speed of mainframe is measured in MIPS BZH$s J{V H$mo MIPS (Millions of Instruction per
(Millions of Instructions Per Second), e.g., IBM second) _| _mnVo h¢Ÿ& BZHo$ CXmhaU h¢: IBM Z9, IBM
Z9, IBM Z10, Hitachi Z800, HP Non Stop.
Z10, Hitachi Z800, HP Non Stop Am{XŸ&