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Explain differance between Primary and secondary storage ?
Computer storage is classified within primary(main) memory and secondary(peripheral) storage.a) Primary storage is commonly RAM; ~10ns access timeb) Secondary storage is commonly hard disk drives; ~10ms access timec) Secondary storage is a lot cheaper than primary, 3¢/Mb vs.$1/Mb.
a) Databases are stored in secondary memory, and large databases are manipulated in secondary storage.b) We required minimising disk accesses while accessing and manipulating databases.
During the deletion of a tuple two cases can happen: Deletion of tuple in relation having the foreign key: In this type of case simply delete the desired tuple. For example, in
1. Will you advise that your organization uses open source software and why? 2. Why is it important for business managers to have a basic understanding of the software development
If R1 and R2 are two union compatible relations or functions, then the result of R3 = R1 ∩R2 is the relation that contains all tuples that are in both the relations In other words,
how to prepare a data dictionary for online examination system for certified courses?
Fifth Normal Form (5NF) These relations still have a difficulty. While defining the 4NF we mentioned that all the attributes depend upon each other. Whereas creating the two ta
Question: Using the data model express the following queries in SQL. (a) Create the Table named "Cinema" and make the cinema_code to be the primary key of the relation and
You have a friend that runs a motor bike club that holds racing events at various venues on weekends, on a monthly basis. Some venues are private race tracks and some are dirt trac
Compare the Nested-loop join and block-nested loop join Ans: Nested loop join - It is costly as worst case cost, no. of block accesses needed is n r * b s + b r where b
File Organisation And Its Types Just as arrays, trees, lists and other data structures are used to execute data Organisation in main memory, a number of planning's are used to
What is normalization? It is a method of analysing the given relation schemas based on their Functional Dependencies (FDs) and primary key to attain the properties (1).Minim
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