Data storage and management has become the new frontier in every business’s attempts to stay ahead. With so much technology evolving in the Database Management Software (DMS), it is only natural to expect heightened demand for new skills in the industry.
Well, if you are preparing for an Oracle database administration (DBA) test, you are in luck because you can easily ace it by assessing common interview questions. While the phrasing may change, the basic tenets of application will remain constant allowing you to stay ahead of the panel.
Top Interview Questions and Incisive Thoughts on the Answering
Take a few minutes to refresh your brain with these questions:
- You want this Oracle DBA job but what according to you is a database?
It might sound easy because you know how to work with a database yet the panel wants you to highlight major functions of an Oracle database. You have to talk about a structure where information attributes of entities are stored and retrieved with help of tables.
- How many memory layers are in the SGA shared pool?
You have to delineate the three major areas including the library cache area, which consists of parsed SQL statements, execution plans and cursor information. Secondly, there are the buffers for parallel exaction messages and thirdly the dictionary cache, which contains the all-important cache-user account information, privileges, data files and extent information.
- Give two storage systems and explain the one used by Oracle DMS?
You should directly go to the systems starting with hierarchical storage (HSM) and then relational database management system (RDMS). To prove you understand each, explain each in passing and clarify that while most databases use RDMS Oracle can also use HSM.
- Has Oracle provided any packages for use by developers?
The panel wants to assess your understanding of the choice of Oracle over other database software. Of course, Oracle has provided DBMS range of packages including DBMS_UTILITY, DBMS_DDL, UTL_FILE and DBMS_SQL, DBMS_PIPE, DBMS_TRANSACTION among others.
- What constraints has Oracle introduced in the software and what do they do?
The expectation here is for you to explain the functioning of Oracle ERP, this time highlighting the Unique Key used to enforce uniqueness of columns, value constraint to help check value of a column against other values, not-null constraint to avoid null entries in columns and a referential integrity function to allow a foreign key relationship between tables.
- What is an Oracle instance and how does it relate or differ from a database?
Oracle DBAs and Advanced EPM consultants cite this as one of the most common interview questions. An instance is a combination of Oracle background processes including PMON, SMON, DBWR and LGWR and the memory structure. Database on the other hand is a collection of data files, redo log files and control files. An instance mounts and opens a single database ever.
- What are the components of logical database structure for an Oracle database?
Again an easy question until your realize you can’t remember table spaces and databases’ schema objects.
Melanie Darwin is an old hand in the IT industry having started at Microsoft in the 1980s before working with myriad other firms. As a consultant with Advanced EPM,she brings a wealth of knowledge to help businesses in enhancing their performance.