Oracle DBA interviews, especially for senior roles, usually go beyond definitions. The discussion often moves quickly into troubleshooting, recovery, RAC, Data Guard, patching, GoldenGate, and real production scenarios.
Below are some recent Oracle DBA interview questions reportedly asked in a product-based organization, along with practical answers and the checks I would expect a DBA to discuss during an interview.
A common reaction is to increase redo log size and move on. Sometimes that is required, but it is not always the real fix. Redo log sizing controls how frequently Oracle switches logs. It does not reduce the amount of redo generated by bad SQL, unnecessary indexes, row-by-row commits, or poorly designed batch jobs.
This post looks at Oracle redo log sizing from a production DBA angle. We will check log switch frequency, estimate redo generation rate, review MTTR guidance, discuss common failure scenarios, and compare the idea briefly with PostgreSQL WAL pressure.
If you have ever recovered an Oracle database and opened it with RESETLOGS, chances are someone whispered or shouted—the dreaded question: “Are all my old backups now useless?” Lets set the record straight: in modern Oracle releases, your old backups are still very much usable, and panicking is optional.
In this post, I wil walk you through why this myth exists, how Oracle’s handling of RESETLOGS has evolved over the years, and what you should do to ensure your recovery strategy remains solid. We will cover the mechanics of RESETLOGS, explain the differences between pre-10g version and modern behaviour, and share some practical tips I have learned from managing production environments with terabytes of data. By the end, you you will understand why you can sleep a little easier after recovery and make smarter backup decisions.
When you are preparing for an Oracle DBA interview — or troubleshooting a production issue at 2 AM — definitions alone are not enough. You need clarity. You need context. And most importantly, you need to understand how Oracle behaves under pressure.
Managing an Oracle Database efficiently requires mastering a variety of utilities designed for administration, data movement, performance tuning, and troubleshooting. Whether you’re performing backups, moving data, monitoring performance, or tuning SQL queries, Oracle provides tools to streamline every task. In this guide, we’ll cover the most commonly used Oracle utilities, grouped by functionality, with practical examples and best practices for real-world DBA scenarios.
If you have worked with Oracle databases, you are likely familiar with Oracle Data Pump, the high-performance utility for exporting and importing database objects. Over the years, it has evolved significantly, especially from Oracle 11g to 19c. Understanding the differences is crucial for DBAs planning migrations, upgrades, or performance optimizations.
Database administrators (DBAs) play a critical and often underappreciated role in the world of information technology.
Found an interesting event, that helps to open the database with delay option. The event db_open_begin delay (opening database with delay) is undocumented event ( read unsupported )
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