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What is a shadow copy scheme?
It is simple, but efficient, scheme known as the shadow copy schemes. It is based on making copies of the database called shadow copies that single transaction is active at a time. The scheme also supposes that the database is simply a file on disk.
What is a function group? A function group is a collection of logically related modules that share global data with every other. All the modules in the group are contained in
Define database management system? Database management system (DBMS) is a set of interrelated data and a combination of programs to access those data.
Objectives After reading this unit you should be able to: Explain storage of databases on hard disks; Discuss the execution of various file Organisation techniques;
comparison of oracle RDBMS with MySQL
Which data manipulation command combines the records from one or more tables ? JOIN data manipulation command combines the records from one or more tables.
Critically evaluate the bulleted list of information-related items in this case study. How are each contradictory to the notion of being an information-literate knowledge worker?
Explain Alternate key? Alternate Key - All the candidate keys except primary key are known as alternate keys.
How persistent programming languages differ from traditional programming languages? Database languages vary from traditional programming languages in that they directly manipul
What are the General Transformation Rules for Relational operations? Ans: The transformation rules transform one relational algebra expression to AN EQUIVALENT ONE 1. E
How Relational Calculus is different from Relational Algebra? What do understand by TRC queries and DRC queries? Ans: Relational calculus contain two calculi, the tuple relati
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