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Oracle DBA Interview Questions

Most asked Oracle DBA Interview Questions.

60 Technical Questions
42 Backup & Recovery Questions

Unix For Oracle DBA 20 Questions

Oracle DBA Topics

Overview of Oracle Grid Architecture

Difference between cluster and grid

Responsibilities of DBA's

Creating Oracle Database

Creating Database using SQL

Creating DB in 12c using DBCA

Creating DB in 12c using SQL commands

Managing Oracle 12c Container Databases

Creating Users in Oracle 12c

Managing Pluggable Databases in Oracle 12c

Creating Pluggable Database

Cloning Pluggable Database

Unplug and Plug databases in CDB's

Managing Tablespaces and Datafiles

Extending tablespaces

Decreasing size of a tablespace

Coalescing Tablespaces

Taking tablespaces Offline or Online

Making a Tablespace Read only

Renaming Tablespaces

Dropping Tablespaces

Viewing Info about Tablespaces

Renaming Datafiles

Relocating Datafiles

Relocating Datafiles in Multiple Tablespaces

Temporary Tablespace

Changing the size

Tablespace Groups

Creating a Temp. Tablespace Group

Assigning a Tablespace Group

Diagnosing and Repairing LMT

Scenario 1: Fixing Bitmap

Scenario 2: Dropping a Corrupted Segment

Scenario 3: Fixing Bitmap when Overlapped

Scenario 4: Correcting Corruption of Blocks

Scenario 5: Migrating from a Dictionary-Managed to LMT

Transporting Tablespaces

Procedure for transporting tablespaces

Transporting Tablespace Example


Adding New Redo Logfile Group

Adding Members to group

Dropping Members from group

Dropping Logfile Group

Resizing Logfiles

Renaming or Relocating Logfiles


Viewing Info About Logfiles

Managing Control Files

Multiplexing Control File

Changing the Name of a Database

Creating A New Control File

Cloning an Oracle Database


Switching to Automatic Management

Calculate Undo Retention

Altering UNDO Tablespace

Dropping an Undo Tablespace

Switching Undo Tablespaces

Viewing Information

SQL Loader


From Fixed Length file

From MySQL to Oracle

Using WHEN condition

Conventional and Direct Path Load

Direct Path

Restrictions on Using Direct Path Loads

Export and Import

Invoking Export and Import

Parameters of Export tool

Exporting Full Database

Exporting Schemas

Exporting Tables

Exporting Consistent Image of tables

Using Import Utility

Example Importing Tables

Import from One User to another User

Using Pattern Matching

Migrating a Database across platforms


Data Pump Export

Exporting a Full Database

Exporting a Schema

Exporting Individual Tables

Filtering Objects during Export

Filter Rows during Export

Suspending and Resuming Export

Data Pump Import Utility

Importing Full Dump File

Importing Objects between Schemas

Loading Objects between Tablespaces

Generating SQL File of DDL commands

Import objects of a Schema

Importing Only Particular Tables

Interactive Mode

Flash Back Features

Flashback Query

Flashback Version Query

Flashback Table to Past States

Purging Objects from Recycle Bin

Flashback Objects With Same Name

Flashback instead of PIT Recovery

Enabling Flash Back Database

Sizing flash recovery area

How far we can flashback database

Example:Flashing Back Database

Flashback Data Archive (FDA)
(Oracle Total Recall)


Creating FDA tablespace

Creating FDA

Querying historical data

Log Miner

LogMiner Configuration

LogMiner Dictionary Options

Using the Online Catalog

Extracting Dictionary to Log Files

Extracting Dictionary to File

Redo Log File Options

Example: Finding All Modifications

Mining Logfiles in a Time Range


Opening DB in Archivelog Mode

Reverting back to NoArchiveLog mode

Taking Offline (COLD) Backups

Taking Online (HOT) Backups

Recovering from the Loss of a Datafile

When in Noarchivelog Mode

When in Archivelog Mode

Recovering from loss of Control File

Recovery Manager ( RMAN )

Offline Backups using RMAN

Recover DB when in NOARCHIVELOG

Online Backups using RMAN

Backup tablespaces or datafiles

Image Backups in RMAN

Incremental Backup using RMAN

Updating backup copy for fast recovery

View info about RMAN backups

Configuring Retention policy

Configure Options in RMAN

Maintaining RMAN Repository

Recover datafiles (Archivelog mode)

Recover datafiles by renaming

Performing Disaster Recovery










Backup and Recovery Interview Questions for Oracle DBA

Some of the Common Backup and Recovery Interview Questions for Oracle Database Administrator.  These questions are common for both Senior Oracle DBA or Junior DBA. I have compiled these questions based upon the feedback I got from many candidates who have attended interviews in various MNC's

1. Which types of backups you can take in Oracle?

2. A database is running in NOARCHIVELOG mode then which type of backups you can take?

3. Can you take partial backups if the Database is running in NOARCHIVELOG mode?

4. Can you take Online Backups if the the database is running in NOARCHIVELOG mode?

5. How do you bring the database in ARCHIVELOG mode from NOARCHIVELOG mode?

6. You cannot shutdown the database for even some minutes, then in which mode you should run
the database?

7. Where should you place Archive logfiles, in the same disk where DB is or another disk?

8. Can you take online backup of a Control file if yes, how?

9. What is a Logical Backup?

10. Should you take the backup of Logfiles if the database is running in ARCHIVELOG mode?

11. Why do you take tablespaces in Backup mode?

12. What is the advantage of RMAN utility?

13. How RMAN improves backup time?

14. Can you take Offline backups using RMAN?

15. How do you see information about backups in RMAN?

16. What is a Recovery Catalog?

17. Should you place Recovery Catalog in the Same DB?

18. Can you use RMAN without Recovery catalog?

19. Can you take Image Backups using RMAN?

20. Can you use Backupsets created by RMAN with any other utility?

21. Where RMAN keeps information of backups if you are using RMAN without Catalog?

22. You have taken a manual backup of a datafile using o/s. How RMAN will know about it?

23. You want to retain only last 3 backups of datafiles. How do you go for it in RMAN?

24. Which is more efficient Incremental Backups using RMAN or Incremental Export?

25. Can you start and shutdown DB using RMAN?

26. How do you recover from the loss of datafile if the DB is running in NOARCHIVELOG mode?

27. You loss one datafile and it does not contain important objects. The important objects are there in other datafiles which are intact. How do you proceed in this situation?

28. You lost some datafiles and you don't have any full backup and the database was running in NOARCHIVELOG mode. What you can do now?

29. How do you recover from the loss of datafile if the DB is running in ARCHIVELOG mode?

30. You loss one datafile and DB is running in ARCHIVELOG mode. You have full database backup of 1 week old and backup of only this datafile which is just 1 day old. From which backup should you restore this file?

31. You loss controlfile how do you recover from this?

32. The current logfile gets damaged. What you can do now?

33. What is a Complete Recovery?

34. What is Cancel Based, Time based and Change Based Recovery?

35. Some user has accidentally dropped one table and you realize this after two days. Can you recover this table if the DB is running in ARCHIVELOG mode?

36. Do you have to restore Datafiles manually from backups if you are doing recovery using RMAN?

37. A database is running in ARCHIVELOG mode since last one month. A datafile is added to the database last week. Many objects are created in this datafile. After one week this datafile gets damaged before you can take any backup. Now can you recover this datafile when you don't have any backups?

38. How do you recover from the loss of a controlfile if you have backup of controlfile?

39. Only some blocks are damaged in a datafile. Can you just recover these blocks if you are using RMAN?

40. Some datafiles were there on a secondary disk and that disk has become damaged and it will take some days to get a new disk. How will you recover from this situation?

41. Have you faced any emergency situation. Tell us how you resolved it?

42. At one time you lost parameter file accidentally and you don't have any backup. How you will recreate a new parameter file with the parameters set to previous values.

Also See Oracle DBA Techincal Questions and UNIX Questions Asked to a Oracle DBA



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