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Define multivalued dependency and 4NF.
Ans: Multivalued Dependency - Assume R be a relation schema and let α ⊆ R and β ⊆ R. The multivalued dependency
α →→β
holds on R if, in any type of legal relation r(R), for all pairs of tuples t1 and t2 in r like that
t1[α] = t2[α], there exist tuples t3 and t4 in r like
t1[α] = t2[α] = t3[α] = t4[α]
t3[β] = t1[β]
t3[R - β] = t2[R - β]
t4[β] = t2[β]
t4[R - β] = t1[R - β]
Fourth Normal Form (4 NF) - A relation schema R is in 4NF regarding to a set D of functional and multivalued dependencies if, for all multivalued dependencies in D+ of the
form α →→β, in which α ⊆ R and β ⊆ R, at least one of the subsequent holds:
Explain hash file organization? Hash functions a) The distribution is uniform Hash functions assign each bucket the similar number of search -key values from the set of a
Data Handling and Research Methods: The dataset encompassing 130 participants contains several variables measuring detrimental health related behaviours referring to the use o
What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
When It is better to use files than a DBMS? It is better to use files than a DBMS when Multiple users wish to access the data.
1. Create a subroutine that does the remote blast on the file protein.fa. 2. Pass that returned files from the blast to another subroutine that parses the output and sends it to
What is trigger Triggers are statements that are implemented automatically by the system as the side effect of a change to the database.
What is storage manager? A storage manager is a program module that gives the interface among the low level data keeps in a database and the application programs and queries su
What is RDBMS? Relational Data Base Management Systems (RDBMS) are database management systems that maintain data records and indices in tables. Relationships may be formed and
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#explain five disadvantages of a dbms..
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