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Aggregation: One limitation of the E-R diagram is that they do not permit representation of relationships between relationships. In such a case the relationship along with its entities are promoted (aggregated to form an aggregate entity which can be used for expressing the needed relationships).
what is er digram given that example of hospital,bank and library er digram.
Define a property that is not a property of transactions? Ans: Concurrency is not a property of transactions
what is the need of a log in dbms
Relations create the database. They must satisfy various properties, like no duplicate tuples, no ordering of tuples, and atomic attributes, etc. Relations that satisfy these basic
What is a primary index? A primary index is an index whose search key also explains the sequential order of the file.
Physical Database Design Issues The database design includes the process of logical design with the use of E-R diagram, normalisation, etc., followed by the physical design.
Briefly describe concurrency execution? Lock - based protocols Locks There are several modes in which a data item may be locked in this section we restrict our attention
What is the most significant feature that does not directly map into programming language structures? Why? Association, since there are complex types of association, like as qu
what is query processing ,query optimization and performance turring?
#floating point representation is used to store
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