Client requests and server responds. The major disadvantage of Client Server architecture is:
1. DB Client is installed on the client.
2. Processing takes place at client side.
3. No intermediate buffers for the frequently accessed content.
4. There is no queue mechanism to handle the requests there by servers are heavily loaded.
5. The server side processing consumes resources to process (Interpret the user requests).
The need of middle layer/ tier rose to come out of the steps. The result is the Application layer/ Server.
Application server is deployed and it provides the following functionality:
1. DB Client is installed to free up the clients (i.e. there will be only one DB Client for Application server earlier each client needs DB Client software).
2. There is a queue mechanism to handle the request there by reducing the load on the client and server.
3. User requests are served based on the FIFO using dispatcher.
4. Work process task handlers are used to interpret and process the request.
5. Intermediate buffers are available for the frequently accessed content to reduce the load on the Database server.
6. The server side processing is only takes place for new requests there by server resources are optimally used.
The advantages of deploying Application Layer:
It is the Intermediate layer in between the Client and the Server. It is installed with a database client to communicate with the database server i.e. all the clients are freed with DB Clients.
Application server/ layer handle the request and process them based on FIFO (First in and First out). It has its own queue mechanism to process the user request. It also contains the task interpreters to interpret the user request and route it to the server.
It is intelligent to store the frequently accessed data thereby reducing the load on the server.
