The terms tier and layer are frequently used interchangeably, but actually there is a difference between them: Tiers indicate a physical separation of components, which may mean different assemblies such as DLL, EXE etc on the same server or multiple servers; but layers refers to a logical separation of components, such as having distinct namespaces and classes for the Database Access Layer (DAL), Business Logic Layer (BLL) and User Interface Layer (UIL). Therefore, tier is about physical separation and units of deployment, and layers are about logical separation and units of design. [Read More]
41 comments:
3 separate projects of class Library, for same application, It doesn't mean, that it is a 3-Tier / n-Tier Application.
It is the concern about whether is it a In process communication / out of process communication, in the case of (2-Tier, 3-Tier / n-Tier [Where n>=3]) Tire application.
If in process (should in the case of DLL --> In Process [ Out of process--> Database Service / DCOM / EXE, the application run on separate process space, withing a same machine or different machine]
Better you say "it’s a highly per formant n-Layered application, with multiple n -Tier options".
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What i sthe difference between Tier and Layer in terms of Software project? Also how can we prevent the misuse of DLL use for data access or having business logic?
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Great blog on differentiate between 3-Tier and 3-Layer which quit confusing and mostly famous question asked by interviewer.
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thanx for d info..can u like ut a piksho of the 3tier architecture..tnx
Thanks....
Thanks....
N-Layer means logical separation between code, and N-Tier means physical separation .
N-tier not good for small project due to communication between tier decrease performance of project.
n-tier better for large-mid project.
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I have read this article ..... a good one... but i have also found some interesting material at
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