Task preemption
Task priority
Semaphores
Interprocess communications (IPC)
Local/Remote Interprocess communication
Threads
Intertask protection
Multiuser
High performance file system
Efficient memory management and
Dynamically linked Run-time extensions.
Task priority
Semaphores
Interprocess communications (IPC)
Local/Remote Interprocess communication
Threads
Intertask protection
Multiuser
High performance file system
Efficient memory management and
Dynamically linked Run-time extensions.
SQL is an interactive query language for ad hoc database
queries.
SQL is a database programming language.
SQL is a data definition and data administration language.
SQL is the language of networked database servers
SQL helps protect the data in a multi-user networked environment.
Because of these multifacted roles it plays, physicists might call SQL as "The grand unified theory of database".
SQL is a database programming language.
SQL is a data definition and data administration language.
SQL is the language of networked database servers
SQL helps protect the data in a multi-user networked environment.
Because of these multifacted roles it plays, physicists might call SQL as "The grand unified theory of database".
SQL is a powerful set-oriented language which was
developed by IBM research for the databases that adhere to the relational
model. It consists of a short list of powerful, yet highly flexible, commands
that can be used to manipulate information collected in tables. Through SQL, we
can manipulate and control sets of records at a time.
Service
Shared resources
Asymmetrical protocols
Transparency of location
Mix-and-match
Message based exchanges
Encapsulation of services
Scalability
Integrity
Client/Server computing is the ultimate "Open platform". It gives the freedom to mix-and-match components of almost any level. Clients and servers are loosely coupled systems that interact through a message-passing mechanism.
Shared resources
Asymmetrical protocols
Transparency of location
Mix-and-match
Message based exchanges
Encapsulation of services
Scalability
Integrity
Client/Server computing is the ultimate "Open platform". It gives the freedom to mix-and-match components of almost any level. Clients and servers are loosely coupled systems that interact through a message-passing mechanism.
RPC hides the intricacies of the network by using the
ordinary procedure call mechanism familiar to every programmer. A client
process calls a function on a remote server and suspends itself until it gets
back the results. Parameters are passed like in any ordinary procedure. The
RPC, like an ordinary procedure, is synchronous. The process that issues the
call waits until it gets the results.
Under the covers, the RPC run-time software collects values for the parameters, forms a message, and sends it to the remote server. The server receives the request, unpack the parameters, calls the procedures, and sends the reply back to the client. It is a telephone-like metaphor.
Under the covers, the RPC run-time software collects values for the parameters, forms a message, and sends it to the remote server. The server receives the request, unpack the parameters, calls the procedures, and sends the reply back to the client. It is a telephone-like metaphor.
Resource Manager
Transaction Manager and
Application Program.
Transaction Manager and
Application Program.
Process-per-client Architecture. (Example:
Oracle 6, Informix )
Multithreaded Architecture. (Example: Sybase, SQL server)
Hybrid Architecture (Example: Oracle 7)
Multithreaded Architecture. (Example: Sybase, SQL server)
Hybrid Architecture (Example: Oracle 7)
Non-GUI clients - Two types are:-
Non-GUI clients that do not need multi-tasking
(Example: Automatic Teller Machines (ATM), Cell phone)
Non-GUI clients that need multi-tasking
(Example: ROBOTs)
GUI clients
OOUI clients
Non-GUI clients that do not need multi-tasking
(Example: Automatic Teller Machines (ATM), Cell phone)
Non-GUI clients that need multi-tasking
(Example: ROBOTs)
GUI clients
OOUI clients
Non-GUI Client: These are applications,
generate server requests with a minimal amount of human interaction.
GUI Clients: These are applications, where occasional requests to the server result from a human interacting with a GUI
(Example: Windows 3.x, NT 3.5)
OOUI clients : These are applications, which are highly-iconic, object-oriented user interface that provides seamless access to information in very visual formats.
(Example: MAC OS, Windows 95, NT 4.0)
GUI Clients: These are applications, where occasional requests to the server result from a human interacting with a GUI
(Example: Windows 3.x, NT 3.5)
OOUI clients : These are applications, which are highly-iconic, object-oriented user interface that provides seamless access to information in very visual formats.
(Example: MAC OS, Windows 95, NT 4.0)
MOM allows general purpose messages to be
exchanged in a Client/Server system using message queues. Applications
communicate over networks by simply putting messages in the queues and getting
messages from queues. It typically provides a very simple high level APIs to
its services.
MOM's messaging and queuing allow clients and servers to communicate across a network without being linked by a private, dedicated, logical connection. The clients and server can run at different times. It is a post-office like metaphor.
MOM's messaging and queuing allow clients and servers to communicate across a network without being linked by a private, dedicated, logical connection. The clients and server can run at different times. It is a post-office like metaphor.
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