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Describe Interfaces for the DBA?
Interfaces for the DBA - Most database systems holds privileged commands which could be used only through the DBA's staff. These involves commands for creating accounts, setting system parameters, changing a schema, granting account authorization, and a reorganizing the storage structures of a database.
Attributes that are directly kept in the data base. For example, 'Birth date' attribute of a person. Derived Attributes that are not stored directly but can be derived
Define Outer join Outer join - If there are any type of values in the one table that do not have corresponding value(s) in the other, in an equi-join which will not be selected
How nulls are treated in comparison operator? Along with comparison (relational) operators, the null values are ignored as we cannot derive the relation along with the given op
A super key is an attribute or set of attributes used to recognize the records uniquely in a relation. For instance, in the Relation PERSON defines earlier PERSON_ID is a super
random file orgnization
Define database management system? Database management system (DBMS) is a set of interrelated data and a combination of programs to access those data.
Define seek time. The time for repositioning the arm is known as the seek time and it enhances with the distance that the arm is known as the seek time.
Question 1 Discuss the classification of DBMS based on location of database Question 2 Explain with examples different SQL commands used for creating and deleting relations.
PART MARKING: For this section, we will use part marking. This means we will supply model answers to all questions but we will only mark six questions. We will choose these randoml
brief history,definition,current trends and future trends if any of data fragmentation
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