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What is trigger?
Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
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 databa
Describe DROP TABLE command of SQL along with both the options - CASCADE and RESTRICT. DROP TABLE command - This command drops the specified table. Dropping a table also dro
what is query processing ,query optimization and performance turring?
Benefits of using heuristics
What are the two methods for dealing deadlock problem? The two procedures for dealing deadlock problem is deadlock detection and deadlock recovery.
Define the terms i) DDL ii) DML DDL: Data base schema is particular by a set of definitions expressed by a special language known as a data definition language. DML: A data
define attribute inheritance with example?
A relation instance indicates as r is a collection of tuples for a given relational schema at a exact point of time. A relation state r of the relation schema R (A 1 ,A 2 ,.....
Give some encryption techniques? A) DES B) AES C) Public key encryption
What does the extract statement do in extract datasets? The data is written to virtual memory by extract commands.
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