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Discuss the methods for a hash file to expand and shrink dynamically. What are the advantages and disadvantages of each? The hashing methods that permit dyanamic file expansion are:
(i) Extendible hashing (ii) Linear hashing
The major advantage of extendible hashing that makes it attractive is that performance of the file does not degrade as the file grows. Also, no space is allocated in extendible hashing for future growth, but additional buckets can be allocated dynamically as needed.
A disadvantage is in which the directory must be searched before accessing the buckets themselves, resulting in two blocks accesses on the other hand of one in static hashing.
What are domain constraints? A domain is a set of values that might be assigned to an attribute .all values that appear in a column of a relation must be taken from the similar
Explain weak and strong entity type ? Weak and Strong entity type: An entity set which does not have a primary key is referred to as a weak entity set. The existence of a wea
how to find entities
need requirement analysis for database management of stock market
Define database management system? Database management system (DBMS) is a set of interrelated data and a combination of programs to access those data.
Define the terms i) Key attribute ii) Value set Key attribute: An entity type usually has an attribute whose values are exact from each individual entity in the collection. Su
explain the steps for reduction of er model into relational model?
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Sequences Sequences: Automatically produce unique numbers Are sharable Are typically used to make a primary key value Replace application code Speed up t
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