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:: What is meant by Middleware?
Middleware is a distributed software needed
to support interaction between clients and servers. In short, it is the
software that is in the middle of the Client/Server systems and it acts as a
bridge between the clients and servers. It starts with the API set on the client
side that is used to invoke a service and it covers the transmission of the
request over the network and the resulting response.
It neither includes the software that provides the actual service - that is in the servers domain nor the user interface or the application login - that's in clients domain.
It neither includes the software that provides the actual service - that is in the servers domain nor the user interface or the application login - that's in clients domain.
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:: What are the functions of the typical server program?
It waits for client-initiated requests.
Executes many requests at the same time. Takes care of VIP clients first.
Initiates and runs background task activity. Keeps running. Grown bigger and
faster.
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:: What is meant by Symmentric Multiprocessing (SMP)?
It treats all processors as equal. Any
processor can do the work of any other processor. Applications are divided into
threads that can run concurrently on any available processor. Any processor in
the pool can run the OS kernel and execute user-written threads.
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:: What are Service-specific middleware?
It is needed to accomplish a particular
Client/Server type of services which includes:-
Database specific middleware
OLTP specific middleware
Groupware specific middleware
Object specific middleware
Internet specific middleware and
System management specific middleware.
Database specific middleware
OLTP specific middleware
Groupware specific middleware
Object specific middleware
Internet specific middleware and
System management specific middleware.
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:: What are General Middleware?
It includes the communication stacks,
distributed directories, authentication services, network time, RPC, Queuing
services along with the network OS extensions such as the distributed file and
print services.
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:: What is meant by Asymmetric Multiprocessing (AMP)?
It imposes hierarchy and a division of
labor among processors. Only one designated processor, the master, controls (in
a tightly coupled arrangement) slave processors dedicated to specific
functions.
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What is OLTP?
In the transaction server, the client
component usually includes GUI and the server components usually consists of
SQL transactions against a database. These applications are called OLTP (Online
Transaction Processing) OLTP Applications typically,
Receive a fixed set of inputs from remote clients. Perform multiple pre-compiled SQL comments against a local database. Commit the work and Return a fixed set of results.
Receive a fixed set of inputs from remote clients. Perform multiple pre-compiled SQL comments against a local database. Commit the work and Return a fixed set of results.
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:: What is meant by 3-Tier architecture?
In 3-tier Client/Server systems, the
application logic (or process) lives in the middle tier and it is separated
from the data and the user interface. In theory, the 3-tier Client/Server
systems are more scalable, robust and flexible.
Example: TP monitor, Web.
Example: TP monitor, Web.
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:: What is meant by 2-Tier architecture?
In 2-tier Client/Server systems, the
application logic is either buried inside the user interface on the client or
within the database on the server.
Example: File servers and Database servers with stored procedures.
Example: File servers and Database servers with stored procedures.
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:: What is Load balancing?
If the number of incoming clients requests
exceeds the number of processes in a server class, the TP Monitor may
dynamically start new ones and this is called Load balancing.
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