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Structure of Client Server Systems:In client/server architecture, clients show users who require services while servers give services. Both client and server are a combination of hardware & software. Servers are divided logical objects that communicate with clients over a network to do tasks together. A client makes a request for a service & receives a reply to that request. A server gets & processes a request, and sends back the needed response. The client/server systems may have two different types of architecture -
2-Tier and 3-Tier Client/Server Architectures
Each client/server application contains three functional units:
These functional units can reside on either the client or on one or more servers in the application:
Figure: A client-server system
what is Mapping Constraints? with examples
Q. Explain data aggregatio n and discuss different design constraints. Sol. Aggregation One limitation of the E-R model is that it cannot express relationships amon
The State of Newyork certifies firefighters throughout state keep track all of them, as well as the state’s of fire departments. Each fire department has unique department number
for the following business rules . Identify all entities, attributes, relationships, primary keys, cardinalities and constraints where appropriate 3. (9) An art museum owns a larg
What is Nested Queries explain in details? Nested Queries - A SELECT query could have subquery(s) in it. While a SELECT query having another SELECT query in it, is known as n
Multi-Key File Organisation In this part, we will introduce two basic file Organisation schemes that permit records to be accessed by more than one key field, therefore, allowi
What is called as an N-way merge? The merge operation is a generalization of the two-way merge used by the standard in-memory sort-merge algorithm. It merges N runs, so it is k
how to calculate frequency count of algorithm
Which is an advantage of view? The Advantages of view is Data security, Derived columns and Hiding of complex queries
What are ways of finding out either an update is required or not for derived attributes? The ways to find out an update is required or, not are as: Explicit update
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