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Backward Recovery (UNDO):In this system the uncommitted changes made by a transaction to a database are undone. Instead the system is reset to the last consistent state of database that is free from any errors.
What are the storage types? The storage types are: a) Volatile storage b) Nonvolatile storage
What is meant by heuristic optimisation?Discuss the major heuristics that are applied during query optimisation.
Describe identifying relationship? Identifying relationship: It is relationship among strong entity and a weak entity it is represented through a doubly outlined diamond in C
In E-R diagram how generalization is represented? in E-R diagram generalization is represented by Triangle shape.
What does the extract statement do in extract datasets? The data is written to virtual memory by extract commands.
Problem 1. Write the SQL queries using Data Manipulation Language (DML) statements. Insert values into student table with field names using insert command Display the
Describe relational model? Structure of relational data base Basic structure Database schema Keys Schema diagram Query languages
Normal 0 false false false EN-US X-NONE X-NONE
What is Alternate Key Alternate Key: This is the candidate key which is not taken as the primary key of the table. They are named so because although not the primary key, the
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