Performance testing

Performance testing is designed to test the run-time performance of software within the context of an integrated system.
It occurs throughout all steps in the testing process.
It coupled with stress testing & coupled with both hardware and software testing.
It is conducted prior to implementation to determine how long it takes to receive a response to a inquiry, make a backup copy of file, or send a transmission& receive a response.
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Servers

File servers. -With a file server, the client passes requests for files or file records over a network to the file server. This form of data service requires large bandwidth and can slow a network with many

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EDI Implementation

The following is a generalized list of major points for consideration when undertaking an EDI project:
1. Obtain commitment from all areas of management.
Involvement from all impacted departments is essential. Each department should be included in the analysis, testing and implementation to validate the testing and to ensure that the resulting system meets the objectives.
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Advantages of Black Box testing

 Advantages of black box testing -   
  Following are the different advantages of black box testing -
•    more effective on larger units of code than glass box testing.
•    tester needs no knowledge of implementation, including specific programming languages.
•    tester and programmer are independent of each other.
•    tests are done from a user's point of view.
•    will help to expose any ambiguities or inconsistencies in the specifications.
•    test cases can be designed as soon as the specifications are complete.
     Disadvantages of Black Box Testing -
•    only a small number of possible inputs can actually be tested, to test every possible input stream would take nearly forever.
•    without clear and concise specifications, test cases are hard to design.
•    there may be unnecessary repetition of test inputs if the tester is not informed of test cases the programmer has  already    tried.
•    may leave many program paths untested.
•    cannot be directed toward specific segments of code which may be very complex (and therefore more error prone).
•    most testing related research has been directed toward glass box testing.

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Client server architecture

Client/server architecture  The client/server architecture significantly decreased network traffic by providing a query response rather than total file transfer. It allows multi-user updating through a GUI front end to a shared database. Remote Procedure Calls (RPCs) or standard query language (SQL) statements are typically used to communicate between the client and server. 
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EDI

EDI architechture specifies 4 layers:-

1)Semantic (application layer)
2)Standard transaction layer
3)Packing (transport) layer
4)Physical n/w infrastructure layer.
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Black Box Testing

Black Box Testing is testing without knowledge of the internal working of the item being tested. 
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competitive advantage

It is a competiton between companies to upgrade that company which is more powerful...
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Data Modeling

 It gives answers to questions regarding the data that is to be used in the application. We come to know the data objects, where they are stored, what is the relationship between objects, etc. Data modeling uses an Entity Relationship diagram to solve these questions. An Entity Relationship diagram will focus on all data that are entered, stored, transformed and produced within an application. The data model consists of three interrelated information – data objects, attributes that describe the data objects and relationships that connect data objects to one another.

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