CLIENT SERVER

UNIT-II

TWO MARKS:-

1.Define DDE

It is an interprocess machnism for exchanging message between processor running in the computer

            It is implemented in Microsoft windows products successes technology which include OLE object linking and embedding component object model- COM DECOM -distributed component object model

2.Define OLE

            Linking is oneway of an attacking information from one application to another link can lock brocken are reconnected

            Linked information in stored in source application emboding makes the information to be embedded. A part of distributed of document the increase the size

3.Advantage of OLE:-

            We can display an embedded one linked object as an icon instead of is full size

            We can convert the embedded are linked to a different application

4.define CORBA:-

            It is a distributed object technology define by the OMG(object management group) it is OMA (Objects Managament Architecture) specification the architecture are also attapted by the open group

5.distributed object technology:-

          A single model in the verb and the  relationship between web browser abd server .a web browser is like a contains that can hold text and object when user cannot with web server objest such as text,graphics,java applets and activities control are downloaded into the web browser become a component documentt

FIVE MARK:-

1.The role of client:-

          In the client model the client is primarly a consumar of services provided by one or more processors

The model provides a class sebration of function based on the idea of server acting a services provided response into request from  client

          The client almost always provides presentation services. It facilities such as DDE,OLE,LORBA software to support specific function like field,edit,content sensitive helps navigation traning etc…

            Which are frequently executed of the client workstation

            All these functions it the GUI and windowing functionality

            A client workstation uses the local os to host basic services and windows os interface

            The os may be the same are different from that of the server most  of user today use dos or windows as they are client server or because current user are primarly personal productivity application

            Unix and os-2 are in lock of femilar of specific productivity tools such word process email and database ms-dos and windows have become the client or of choice

2.ROLL OF SERVER:-

Server provide application file,database,print,text,image,communication,security,system and management services

            An application is the mechanism that the server asa agood replacement when application of downsized from a host one option is instate the application on a smaller machine run the same softeare looks all the user to the new pox

            File server manager a workgroup application and data file so that they many input,output oriented the pull large amount of data off they are storage sub system and bass the data over the network

            File working is handled by locking the entire file or locking byte rangr there is no differentriate between read lock and write locks at this level

            They can be schulding multiple user no catching management ,no lockers manager and minimal can currently in the DBMS because there is ni single engine to which all the reguir information is available

            Two technicic used to minimize the amount of data that process over the network are organizing data so that the data needed by a particular application request is stored in a single configuous block.

            Storing copies of data accessed by more then one user to helth concurrency problem database server is the most difficult use of server  is technology in client server application

Most if not all of the data application is run on the client using a data server or communication of data and computer program consists of application specifies code as well as presentation logic.

            Because the database engine is separate from the client the disadvantage of file server disappears.

3.NETWORK OPERATING SYSTEM:-

            Network operating system provide feature for controlling lands or internet work and server clients

            The NOS provides a set of products for accepting request from client and repanding  tho those request

            It provides a shar file system and of security feature and control to control user access to network resources

            The dominant NOS on the market today or listed below

                        Novel network

                        Banyan

                        Ms –windows Ni server

                       DBMS or to server

                        Sun micro system solarises

                        Linux and unix

Feature of NOS:-

            Server provided such as virus checking software and hardware inventory and server application

            Os features such as support for SMP

                        File an print services

                        Fult fold declares

                        Support for names and delivary services etc….

4.SERVER FUNCTIONS:-

            The  term server has two general rowtation

            A piece of hardware that provide shared services in a network environment

            A software componetnt a provide generalize functional services to other software component request are issured by client to a no service software resident on the client

File services:-

            It handle access to virtual directly and file located on the client workstation servers permanent storage

            In difficult information software shared data,databse,and backup are storage device that are managed by the file server.

PRINT SERVER:-

            The server can manage several printers automatically sending printing to the first free printer

            The server can key track of special paper and ensure that the print job is held in its queue until one printer has the right gained of paper

            Print jobs can be scheduled to run at regular interval because the server is turn on all the time can run jobs evev it the orginal request machine is not even connected at the time

Database services:-

            Early database server users actually file server with the different interface products such as base,click bar,foxpro,pretax

            Executed the database engineprimarly on the client machine on the use file services provided by the file server for record access and free page management

            Os database such as Sybase,IBM’s database manager ,ingres,oracle and informic support at the server tto execute SQL request insured from the client workstation

5.client services:-

            The ideal client server platform operate is an open system environment using a request server desplines that is based on well define standard this enables multiple hardware and software platform to intract when standard request server displace at hard to server way group and changes to client application

            Client can be entry level intel processor or very powerful rise base workstation and run the same application issuing the same request for service as long as the standard request or server displines is to sending and receiving a character data string to an from a server

            First generation client server application using software such as usel enable the input and output the data streams to read foematted at the client without changes to the port application the data string format

            The client server implementation of the system the workstation uses datails with the GUI the workstation block this address an a ncap that in term display the location on at of the fine wall in addition location of all firewall to be balatted on the map

            The functionality of the client process can be further ectended at the client by adding logic that is not implemented in the port server application local,adding automatic,data entry health capabilities and other logic process can be added in front of the existing port server application

            It many errors of deducted at the client or function such as online help are complexity of loaded the work load of the port server decreases

            This workstation technology supports the new business were become paradiagram of embloyee empocoerment  it provides a windowing capacity symultensouly access an display all information necessary the business process

            A capacity of powerfull workstation technology to regiment and make disition make on historical prestendent can dramativally reduce cost and improve services by shorting the decision making cycle.

6.network operating system:-

            Network operating system provides feature for controlling lands and internet work and for serving clients

            The NOS provide a set of product for accepting request from client and repanding to those request.

            It provide a shar files system and of security feature and control to control user access to network resourses

            The dominant nos on the market today or listed below

                        Novell network

                        Banyan

                        Ms-windows server

                        DBMS os to server

                        Sun micro system solaries

Linux or unix

Novell network:-

            Novell has been major different in the growth of the micro computer intastry if developed I-80 vase mc in an 1970 and created its first networking products in the early 1980

            Navel main product during the emerging the here of the personal was file sharing devices based on motolaw of 68000 process

            In 1983 when IBM another an IBM PCxt which had harddisk drive the novel quickly reparented with a product that converted the harddist drive system into a file sharing system.

            Novell stop publishing and pushing its own hardware and behind provide support for product that many vendor this was one most in the advance as went of netware as an interdistrded.

Land manager:-

            Microsoft land manager is a nor that done on ms version of os/2 the done the product was also market by ibm land server product have by supported new product in the case of ms land manager was replace by windows NT server a self saticified or that does not require os/2 in the cost of IBM with os/2 WAMPSERVER

Banyan vines:-

            It is a networking or with the unix norval that allows  user of popular pc desktop os such as DOS,os/2 windows stored information for mickindows system  to other port computing sysyem.

            Unix first appear in 1980 it provide full unix NFS support in its core service an ICPIB for transport

            It is also includes banyan street take directly service passively the most popular component of the os

            It fact banyan as market street of an other platform including windows NT server 

Vines feature:-

Like other network while is bulid around service that provided services to client workstation it is design to help orgamnistion fully distributed computing environment amount suit of enterprice networking services including security messaging administrator messaging port connectivity and bank communication

            Vines provide enterprice network services that are not server centric where services centric

Uses an banyan network access an view resource logically without needing to know here resources ware ficicall located

Pc-nfs:-

Nfs is a standard file system support for unix pCNFS is available from sun select and FTP to provide file services support from a unix server to windows ,os/2,mickindows and unix client

Nfs is the client moment an NFS port filling system as an extended of it own resources the transcation amount NFS system tratisnally right across TCP,IP and either net but NFS works with any network that support 802.3 frams

            Sun select includes instruction for adding  PCNFS to an existing and manager or windows are workgroup network NIFS

7.server operating system:-

            Server provide the platform for application data base an communication services there are six os platform that have the potential and or private to day

                        Novell network

                        Os/2

                        Windows NT

                        MVS

                        VMS  

                        And unix

Netware :-

            Netware is used by many organization large and small for the profised for file printer and network services

            Netware is a self contained operation system it does requie a separate os to run

Novell is taking steps to allow netware to run on server with unix novell purchared USL and will develop shirnk wrapped product to run under both netware and unix system

            The product will be enable UNIX to simultaneously access information  from both a netware and a unix server

Os/2:-

            Os/2 is the server platform for intel products provided by IBM in the system application architecture mode

            Os/2 provides the storage protection and prremptive multitasking services needed for the server platform

            Several database and many application products the storage protection and preemptive poeted to os/2

            The only network operating system directly supported with os/2 are LAN manager and LAN server

Windows NT:-

            With the release of windows NT in septener of 1998 microsoft staked its unique position with a server operating system

            Microsoft previous development of os/2 with IBM did not create the single standard UNIX altenative that was hoped for

            NT provides excellent support for windows client and incorporates the necessary storage protection services requied for a reliable server operating system

            It implemented of c2 level security goes well beyond that provides by os/2 and most unix implementation

MVS:-

            This is the primarly operating system indiducing in 1994 for IBM main frams its parch oriented an design to manager lager amount of memory and disk place mvs runs IVM s/393 and ES/900 services computer

            This is a commitment by IVM provide support for the around server running natively and an mvs this an  actravitive option for organization for mvs application

            The very large data storage capabailty system 370 comportable platform with mvs make the use mvs for learn land services attractive are the mvs provided powerful database server use in BB@ and lvl-2

Open VMS:-

            Digital equipment corporation provides open  vms as it server platform of choice

            Many organization have large investment in VAX hardware and DEC net networking

            DCE net provides odeas support for the single system image model LAn technology is fundamental of the architecture of DECnet

UNIX:-

            The unix os for development by AT and T by hint thamson and 1967 and early tennis richi 1964 then early 1970’s is original version were design run on DCE BTP-II that of 16 bit

            In 1973 bell caps completely revoll unix in c language this made unix highly portable around 1975 AT and T made the os available an on open basic to university and colleges to based in research project and computer since program

8.features of unix:-

            The unix os for delovelopment by AT and t by hent Thomson and 1967 and early tennis richi’s 1964 then early 1970’s is original version were design run on DEC BTP II that of 16 bit

            In 1973 bell caps completelyrevoll unix in c language this made unix highly portable around 1975 AT and T made the os available on on open basic to university and college to used in research project and computer since program

The university and AT/t bell join force to create univel the with the goll of developing universw a text top unix system with build in NNS

            In 1993 novell purchase USL and format the user (unique system group) to manager unique ware the purchse of USL novell gaid control of unix SPR4 of run the dismary of other unix vendor

            The X open group for found in 1984 bybull,fixed of plysix and on other company to promote standard by texting confability

            The computing community is close to consense on what the unix kernel and shell will look like and on other definition of the specific API’s

            During all of those generation one major unix problem hass persisted that differentiate it form DOS,windowsNTand os/2 in client server world

9.distributed computing eniviroment:-

            A distributed computer system is evaluation growth from centralized computer system and the client server computing system

structure

Distributed computing is a pasically client server computing an a while scale data is no located in one server but in any services might br geographically devices are connected by WAN into enterprics network

            That join the manily many foemally atanamal computer system is workgroup department pranchamges and defision or organization

10.advantage and disadvantage of DCE:-

            The distributed computing model support access to data already located at device sides data base are located or replicated to other location so that user at both location can access data locally rather than use an expensive vanting to access centralized data ay corporate head quateras.

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