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Task 1.1

Critically compare completely different information models and schemes

You are needed to spot varied styles of information models like hierarchic network relative and object-oriented. Use acceptable diagrams to match and distinction the key options, benefits and drawbacks of every information model.

You are needed to use the suitable diagram to clarify the information schema that consists of 3 layers like external, abstract and internal. you're needed to clarify the practicality of every schema of every level (with the assistance of examples).

Task 1.2

Critically discuss the profit and limitations of the various information

You are needed to spot varied styles of information technologies like file-based, electronic database, multimedia system information, computer database, distributed information, information reposition (data mars and information mining), web-based technology (cloud computing). Discuss edges and limitations of every technology.

Task 1.3

You are needed to spot 2 approaches like top-down and bottom-up concerning planning databases. beneath the top-down approach, you're needed to debate ERD modelling method. this could embrace the notation that you utilize for ERD modelling, the entities, the relationships, the kind of relationships, the attribute of entities got to be illustrated with acceptable pictures. you're needed to clarify the role of the top-down approach concerning planning information systems. concerning bottom-up approach, you're needed as an example however social control method would facilitate to spot normalise tables for the information answer. you're needed to use examples once illustrating un-normalised kind, initial traditional form(1NF), second traditional-form(2NF) and third normal form(3NF).

Normalisation method (has to be explained)

-Un-normalised kind

Under this method, you're needed to collect all the information and make one table having all the entities and also the attributes and outline a primary key for that enormous table.

First traditional form(1NF)

-Under this method, you're needed to spot all the continuation teams and take away all those continuation teams and make a separate table and rest got to be unbroken in another table. make certain you outline the first key and composite key for those tables

-Second traditional form(2NF)

Under this manner, you're needed to get rid of all the partial dependencies; this implies you're needed to spot non-key attributes looking on one amongst the keys of the composite key. after you determine them, separate them in another relative table, and also the rest ought to have remained in another table.

-Third traditional form(3NF)

Under this manner, you're needed to spot non-key attributes looking on another non-key attribute and separate them, to a different relation.

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