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Explain data independence ?
Data independence is the capacity to modify the schema at one stage of a database system without having to change the schema at the further level. The three-schema architecture permits the feature of data independence. Data independence occurs since while the schema is changed at a few level, the schema at the further level remains unchanged; only the mapping among the two levels is changed.
What is the difference among a database schema and a database state? The collection of information stored in database at particular moment in time is known as database state a
Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
) Define a job scheduling strategy that will meet business requirement of reporting availability by 6am CST for the following cubes? Show the job scheduling dependencies in a picto
how many hourse have been spent on a certain project
Database Errors: An error is said to have occurred if the implementation of a command to manipulate the database cannot be successfully finished either due to inconsistent data or
#question.what is mapping constraints and types?.
how to construct labelled precedence graph for view serialiability.please explain insteps with one solved examples
why we fregment at all?
Evaluate: a.When transactions T1 and T2 are in a deadlock, one of the transactions will eventually implement to completion and let the other one continue implementation. b.
what is cascading? what is rollback cascading? please explain in detail
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