database relational model, Database Management System

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what do you mean by primary key constraint?

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Explain the hierarchical database model, Problem: (a) Briefly explain t...

Problem: (a) Briefly explain the ‘Hierarchical Database Model' using appropriate diagram. (b) List and briefly describe five potential benefits of the database approach comp

How many block accesses average saved on using primary index, Normal 0 ...

Normal 0 false false false EN-US X-NONE X-NONE

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Define According to the levels of abstraction, the schema at the intermediate level is called Ans: As per to the levels of abstraction, the schema at the intermediate level is

Prove that a relation which is 4nf must be bcnf, Prove that a relation whic...

Prove that a relation which is 4NF must be BCNF. Ans Let R be in 4NF. Suppose it is not in BCNF. Hence, there exists an FD X→Y in R such that x is not a super key. Although

Client dbms, i need to submit in this topic.

i need to submit in this topic.

Graphical user interface tools, These are interactive interfaces, graphical...

These are interactive interfaces, graphical that hide the difficulty of the DBMS and query language behind an intuitive, simple to understand, and convenient interface. This permit

gaps in sequence values can happen when-sequences, Gaps in sequence values...

Gaps in sequence values can happen when: - A rollback happens that is when a statement changes are not accepted. - When the system crashes - When a sequence i

Define deferred update technique of recovery, Discuss deferred update techn...

Discuss deferred update technique of recovery. What are the advantages? Ans: The deferred update methods do not physically update the database on disk till after a transact

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How to rearrange the execution order for efficiency, Rearrange the Executio...

Rearrange the Execution Order for Efficiency Rearranging execution order for efficiency means executing such job that requires less execution time. By rearranging the object

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