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What is transaction?
Collections of operations that form a single logical unit of work are known as transactions.
How many levels can be viewed in Architecture of the database ? Architecture of the database can be viewed as three levels.
Redo Logs: Any database must have minimum two redo logs. These are the rules for the database; the redo logs record all modifies to the system objects or user objects. If any type
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What is trigger Triggers are statements that are implemented automatically by the system as the side effect of a change to the database.
Define physical and logical data independence. How does this architecture help in achieving these? Data independence entails that change in one view must not need a change in t
What is relationship instance ? Relationship Instance - A relationship is a relation between two or more entities. An instance of relationship set is a set of relationships.
A software contract and consultancy firm maintains details of all the various projects in which its employees are currently involved. These details comprise: Employee Numbe
Explain the difference between using functions along with and without grouping attributes in relational algebra. Give examples. Ans: Group functions are used to group data of
composite attribute
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