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Explain the Role of a database administrator
a. Defining the Schema
The DBA describes the schema which consists of the structure of the data in the application.
The DBA defines what data needs to be present in the system ad how this data has to be denoted and organized.
b. Liaising with Users
The DBA wants to interact continuously with the users to understand the data in the system and its employ.
c. Defining Security & Integrity Checks
The DBA finds out about the access restrictions to be defined and demonstrates security checks accordingly. Data Integrity checks are as well defined by the DBA.
d. Defining Backup / Recovery Procedures
The DBA as well defines processes for backup and recovery. Defining backup procedures involves specifying what data is to backed up, the periodicity of taking backups and as well the medium and storage place for the backup data.
E. Monitoring Performance
The DBA has to incessantly check the performance of the queries and take measures to optimize all the queries in the application.
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Explain data dictonary on oracle ? Data Dictionary - Data dictionaries are the system tables in which contain descriptions of the database objects and how they are structured.
Define data conversion? Helpful to load data into temporary staging tables. Then can write SQL code to do much of data processing. SQL code is simpler and faster to write than
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What is a database? Database - Basically in simple terms A database is a collection of inter related data and/or information stored so which it is available to several users
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Explain about primary key Primary Key: It is one of the candidate keys that are taken to be the recognizing key for the entire table. E.g. although there are two candidate ke
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