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Differance between internal and external schema?
Internal and external schema: Internal Schema• Describes the physical storage structure• Uses a physical data model External Schema• Includes a number user views• Uses a conceptual or an implementation data model
explain at least five widly used case tools
What do you mean by an execution plan? Why is it used? How will you view it? a.) An execution plan can be known as a road map which textually or graphically illustrates the dat
The scenario You have been approached to design and implement a prototype of a distributed information system for a national car part retail outlet chain. The company comprises
What is called a query evaluation plan? A sequence of primitive operations that can be used to assess a query is a query evaluation plan or a query implementation plan.
The advantages of a database management system (DBMS) include :- Data integrity and elimination of duplication.
Product adder required for Ecommerce website Project Description: Want a product adder for 500 products I have a magento website and need products pulled from site A to my si
Show a centralised schema to support the operation of the system you have chosen, including in particular: the product catalogue; the outlets and respective stocks; customer record
Explain the Recoverable Schedule A recoverable schedule is one in which for each pair of transactions Ti and Tj such that Tj reads a data item formerly written by Ti, the comm
What is the main advantage of the object model? What are its different components? The object model focuses on the logical data structures. Each object model comprises of many
Explain the difference between optimistic locking and pessimistic locking. Optimistic locking supposes no transaction conflict will occur and deals with the consequences if it
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