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Define DBA database administrator?
DBA: A database administrator (DBA) is a person who is responsible for the environmental aspects of a database. In common, these involves:
Recoverability - Creating and testing Backups Integrity - Verifying or helping to verify data integrity Security - Defining and/or implementing access controls to the data Availability - Ensuring maximum uptime Performance - Ensuring maximum performance Development and testing support - Helping programmers and engineers to economically utilize the database
Explain the main advantages of DBMS over File Oriented System ?
State The position of object at any moment is called state. An object can have many states depend upon time. After receiving some input instructions, the object can change its
A Functional dependency is described by X Y between two groups of attributes Y and X that are subsets of R specifies a constraint on the possible tuple that can make a relation
give me a diagram about physical or internal level
What is the use of keyword ISA? The use of keyword ISA is to show that a class is a specialization of another class.
data models are being replaced over years. Reasons and why does that happen?
Explain the ACID properties of a transaction Ans: ACID properties are a significant concept for databases. The ACID stands for Atomicity, Consistency, Isolation, and Durability
What is a SELECT operation? The select operation selects tuples that please a given predicate. We use the lowercase letter σ to denote selection.
ERD Diagram of Medical Recruitment Agency?
growing phase and shrinking phase are disjoint, why ?
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