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A distributed transaction consists of subtransactions that execute at different sites and access local DBMSs at those sites. For example, a distributed transaction that transfers m
What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
Super keys of a relation can have extra attributes. Candidate keys are minimal super key, i.e. such a key have no extraneous attribute. An attribute is known as extraneous if even
what is view?explain
In the ER diagram, one example of subclassing is depicted following the Services entity. The subclasses Item Based and Time Based are created. The entity Services gains the attribu
Why older data models are being replaced by new data modelling 100 words accepted#
deffine class&object
Give a sample of the Dynamic Model. The sample of dynamic model is given below: Dynamic model for the car: Brake and Accelerator Brake or Applies Accelerator
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.
external and internal mapping with examples
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