A Database Administrator is a person or a group of person who are responsible for managing all the activities related to database system. This job requires a high level of expertise by a person or group of person. There are very rare chances that only a single person can manage all the database system activities so companies always have a group of people who take care of database system.
In a nut shell, A DBA is the controller of everything related to database system. Now let us discuss what are the main role and duties of Database Administrator (DBA).
Role, Duties and Responsibilities of database Administrator ( DBA)
Installing and Configuration of database: DBA is responsible for installing the database software. He configure the software of database and then upgrades it if needed. There are many database software like oracle, Microsoft SQL and MySQL in the industry so DBA decides how the installing and configuring of these database software will take place.
Deciding the hardware device
Depending upon the cost, performance and efficiency of the hardware, it is DBA who have the duty of deciding which hardware devise will suit the company requirement. It is hardware that is an interface between end users and database so it needed to be of best quality.
Managing Data Integrity
Data integrity should be managed accurately because it protects the data from unauthorized use. DBA manages relationship between the data to maintain data consistency.
Decides Data Recovery and Back up method
If any company is having a big database, then it is likely to happen that database may fail at any instance. It is require that a DBA takes backup of entire database in regular time span. DBA has to decide that how much data should be backed up and how frequently the back should be taken. Also the recovery of data base is done by DBA if they have lost the database.
Tuning Database Performance
Database performance plays an important role for any business. If user is not able to fetch data speedily then it may loss company business. So by tuning an modifying sql commands a DBA can improves the performance of database.
All the databases have their limits of storing data in it and the physical memory also has some limitations. DBA has to decide the limit and capacity of database and all the issues related to it.
The logical design of the database is designed by the DBA. Also a DBA is responsible for physical design, external model design, and integrity control.
DBA writes subschema to decide the accessibility of database. He decides the users of the database and also which data is to be used by which user. No user has to power to access the entire database without the permission of DBA.
Decides validation checks on data
DBA has to decide which data should be used and what kind of data is accurate for the company. So he always puts validation checks on data to make it more accurate and consistence.
If database is working properly then it doesn’t mean that there is no task for the DBA. Yes f course, he has to monitor the performance of the database. A DBA monitors the CPU and memory usage.
Decides content of the database
A database system has many kind of content information in it. DBA decides fields, types of fields, and range of values of the content in the database system. One can say that DBA decides the structure of database files.
Provides help and support to user
If any user needs help at any time then it is the duty of DBA to help him. Complete support is given to the users who are new to database by the DBA.
Database has to be implemented before anyone can start using it. So DBA implements the database system. DBA has to supervise the database loading at the time of its implementation.
Improve query processing performance
Queries made by the users should be performed speedily. As we have discussed that users need fast retrieval of answers so DBA improves query processing by improving their performance.