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What is object identity?
An object retains its identity even if some or all the values of variables or explanations of methods change overtime.
For each m:n relationship type R, we make a new table (say S) to represent R. We also contain the primary key attributes of both the participating entity types as a foreign key att
Explain Two phase locking protocol A transaction is consider as to follow the two-phase locking protocol if all locking operations precede the first unlock operation in the tra
what is cascading rollback
QUESTION (a) Consider a car database consisting of car model, car make, car origin, Engine capacity, color, cost.
Research Value: 7% Due Date: 17-Sep-2018 Return Date: 11-Oct-2018 Length: 700 words Submission method options: Alternative submission method Task back to top You are required to
Explain Candidate key? Candidate Key - A candidate key is a minimal superkey, that can be used to uniquely identify a tuple in the relation.
While sorting, if the main storage available is not enough, the system writes data to an external help file. The SAP profile parameter, which determines DIR_SORTTMP
Give the levels of data abstraction? There are three levels of Data Abstraction a) Physical level b) logical level c) view level
How external/conceptual mapping and conceptual /internal mapping is performed
difference between internal schema and external schema in DBMS
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