Oracle Database Administrator (Oracle DBA) is a senior position in a managerial capacity who is responsible for the superintending the operation-critical database of the organisation. By virtue of this capacity and the kind of competencies, knowledge, and skills required, this is a “high-paid” job with defined career progression pathway. The IT revolution requires professionals who have Oracle Certification and hence for an aspirant it is d me are the stepping stone in providing a platform and equip them with the fundamental skills for supporting Oracle products.
Just like the Oracle Certification for Oracle DBA, the interview is also challenging and a proactive approach will facilitate you to get the same clear with confidence and ease. Very basic and obvious questions with their answers are as under:
1.Define Oracle and Oracle database?
A.Oracle is an organisation and there is a database server by the same name as well. This database server manages your data in a very organized manner, facilitating the users to not just store but retrieve data that also in an ecosystem which is multiuser. That means the same function of storing and retrieving can be done by a number of users at the same time. The software which manages the database and related physical data are collectively called- Oracle database.
2.What as a DBA are your responsibilities?
A.The role of a DBA are- manage, database, storage, users, security, performance, backup, recovery, and automate jobs.
3.State various Oracle database objects?
A.Following are the Oracle Database Objects- Tables, Views, Indexes, Synonyms, Sequences, and Table Spaces.
4.Describe Oracle index?
A.It is an alternative structure auxiliary with a table to have a direct approach to rows, to enhance the performance of data retrieval.
5.As an Oracle DBA, what are your tasks?
A.Tasks involved are – installing, developing Oracle databases, upgrading database to higher levels, keep eagle watch on the health of the database and proactive take corrective measures for smooth performance. Manage Schema objects, ensure backup and recovery.
6.State the difference between cluster and grid?
A.A group of computers arranged together to deliver the same set of functions is known as Cluster. A Grid can be set resources and be composed of many clusters. There can be cluster off servers running a database software and another set of a cluster of servers performing the application server software and they can exist in a Grid, and you have the option of moving the resources from one cluster to another.
7.Share the steps to install Oracle on Linux system?
A.Setup disks and kernel parameters, create user and DBA group and run the installer to begin the installation process.
8.Differentiate between SMON and PMON processes?
A.SMON – It is a compulsory process in DB and must start automatically and perform recovery after failure, check temporary segments, clean tempt segment, and coalesce free space.
PMON- A mandatory process should perform, monitor and restart any failed server process.
9.What is SCN?
A.System Change Number – This is a value added whenever a deadlock occurs or database changes are made.
10.When do you need to set the “Large Pool”?
A.Large pools restrict RMAN and MTS from competing with other subsystems, for the same memory, and are hence used when they are used.
These are very basic questions and are not the only interview questions and answers for Oracle DBA. Your thorough knowledge and skills, your confidence and calm posture will let you listen, understand and answer better and score well. Your abilities in grasping concepts from the academic advisor of the Oracle Courses will decide your performance in the interview. You can clear the interview with flying colours, with your in-depth knowledge of the subject.