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Consider a database schema consisting of four relations, whose schemas are: Product (maker, model, type) PC (model, speed, ram, hd, price) Laptop (model, speed, ram, hd, s
Lost Updates : Suppose the two transactions T3 and T4 run simultaneously and they happen to be interleaved in the following way (suppose the initial value of X as 10000):
What is relationship? Give examples A relationship is an association between several entities. Example: A depositor relationship associates a customer with every account tha
what benefit can a company gain by managing its own infrasture and services
What is Identity? Identity (or AutoNumber) is a column that automatically produces numeric values. A start and increment value can be set, but most DBA leave these at 1. A GUID
What is conceptual schema? The schemas at the view level are known as subschema that describe dissimilar views of the database.
WHY SHOULD NULL IN A RELATION BE AVOID AS possible?
What are the drawbacks of shadow-paging technique? The drawbacks of shadow paging is:- a) Commit Overhead b) Data fragmentation c) Garbage collection
Strong entity set and weak entity set? Strong entity set and weak entity set: A strong entity set has a primary key. All tuples in the set are distinguishable through that key.
The database will enable college administrators the ability to track students initial major. This will help college officials decide how best to prepare students for their goals an
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