Oracle Interview Questions and Answers in 2025 (100+ Q&A)

Ques:- How will you get the concurrent program output as email?

Asked In :- ghana water company ltd., redgate software,

Right Answer:
To get the concurrent program output as an email in Oracle, you can set up the concurrent program to use the "Email" output format. In the concurrent program definition, specify the email addresses in the "Email" field and ensure that the "Email" option is enabled. Additionally, configure the email server settings in the Oracle Applications to ensure that emails can be sent successfully.

Database Analyst/ Programmer Oracle

Ques:- In account tableaccount type amountac1 credit 300ac2 debit 5000ac3 credit 3000ac1 debit 4000ac3 debit 2000ac2 credit 4000write a query how to get sum of credit & sum of debit

Asked In :- Maventic, komodo health,

Right Answer:
```sql
SELECT
SUM(CASE WHEN account_type = 'credit' THEN amount ELSE 0 END) AS total_credit,
SUM(CASE WHEN account_type = 'debit' THEN amount ELSE 0 END) AS total_debit
FROM
account;
```

Database Analyst/ Programmer Oracle

Ques:- How to kill session?

Asked In :- Qualitrix, north star bluescope steel, rightwave,

Right Answer:
To kill a session in Oracle, you can use the following SQL command:

```sql
ALTER SYSTEM KILL SESSION 'sid,serial#';
```

Replace `sid` and `serial#` with the session ID and serial number of the session you want to terminate. You can find these values by querying the `v$session` view.

Database Analyst/ Programmer Oracle

Ques:- What is unit of measure classes? give atleast two examples.name the underlying table.

Asked In :- TimeTooth Technologies, techlogix,

Right Answer:
Unit of Measure Classes are categories that define how quantities are measured in a database. Examples include "Weight" and "Volume." The underlying table for unit of measure classes is typically the "UOM_CLASSES" table.

Database Analyst/ Programmer Oracle

Ques:- Can i know what is flow of unipay related to UK legislation?what is meant by unipay here? what is the use of Unipay?where we use this unipay?

Asked In :- E-T-A, ramco systems, netscout,

Right Answer:
Unipay refers to a payment processing system used in the UK for handling transactions in compliance with local legislation. It is primarily used for processing payments in various sectors, including retail and e-commerce, ensuring that transactions adhere to legal requirements such as data protection and financial regulations.

Database Analyst/ Programmer Oracle

Ques:- What are the prerequisite set ups for inter organizationtransaction?

Asked In :- l&q group,

Right Answer:
The prerequisite setups for inter-organization transactions in Oracle include:

1. **Define Organizations**: Ensure that the organizations involved are defined in the system.
2. **Set Up Inventory Organizations**: Configure inventory organizations for each organization.
3. **Define Inter-Organization Relationships**: Establish relationships between the organizations, including shipping and receiving organizations.
4. **Set Up Item Master**: Ensure items are defined in the item master for all organizations involved.
5. **Define Shipping Networks**: Configure shipping networks to facilitate the transfer of goods between organizations.
6. **Set Up Inventory Parameters**: Configure inventory parameters for inter-organization transfers.
7. **Enable Inter-Organization Transfers**: Ensure that inter-organization transfer functionality is enabled in the system settings.

Database Analyst/ Programmer Oracle

Ques:- What is the difference between DBMS and RDBMS??

Asked In :- Full Stack Finance, LLC, hippo insurance,

Right Answer:
DBMS (Database Management System) is a software that manages databases, allowing for data storage, retrieval, and management without enforcing relationships between data. RDBMS (Relational Database Management System) is a type of DBMS that organizes data into tables with defined relationships, supporting data integrity and enabling complex queries through SQL.

Database Analyst/ Programmer Oracle

Ques:- ORA-26026: unique index string.string initially in unusablestate

Asked In :- grm,

Right Answer:
The error ORA-26026 indicates that a unique index is in an unusable state, which typically occurs during a DML operation on a table that has a unique constraint. To resolve this, you need to rebuild the index using the command:

```sql
ALTER INDEX index_name REBUILD;
```

Replace `index_name` with the actual name of the index. After rebuilding, the index should be usable again.

Database Analyst/ Programmer Oracle

Ques:- What are the receipt types in Po?

Asked In :- ALTEN CALSOFT LABS (INDIA), Orion Innovation, cirruslabs,

Right Answer:
The receipt types in Oracle Purchasing (PO) are:

1. Standard Receipt
2. Return to Supplier
3. Miscellaneous Receipt
4. Direct Delivery Receipt
5. In-Transit Receipt

Database Analyst/ Programmer Oracle

Ques:- Difference between MS Access and Oracle

Asked In :- AMI Tech India,

Right Answer:
MS Access is a desktop database management system suitable for small-scale applications, while Oracle is a powerful enterprise-level relational database management system designed for large-scale applications with advanced features, scalability, and multi-user support.

Database Analyst/ Programmer Oracle

Ques:- Is that Possible To create package without Specification , If Yes Give any Examples

Asked In :- GyanMatrix Technologies,

Right Answer:
No, it is not possible to create a package without a specification in Oracle. A package must always have a specification (the public interface) and can optionally have a body (the implementation).

Database Analyst/ Programmer Oracle

Ques:- ORA-12988: cannot drop column from table owned by SYS

Asked In :- D H, N-able, soti,

Right Answer:
The error ORA-12988 occurs because you cannot drop a column from a table that is owned by the SYS user. To resolve this, you need to either avoid modifying SYS-owned tables or create a new table with the desired structure and migrate the data.

Database Analyst/ Programmer Oracle

Ques:- What is a bitmap index?

Asked In :- Smart Joules, Manomay Informatics, Bitpastel Solution, gruppo scai, consulenza aziendale informatica, pip,

Right Answer:
A bitmap index is a type of database index that uses a bitmap (a series of bits) to represent the existence of a value in a column for each row in a table. It is particularly efficient for columns with a low number of distinct values (low cardinality) and is used to speed up query performance by allowing quick access to rows based on the indexed values.

Database Analyst/ Programmer Oracle

Ques:- How to migrate .rdf file from dev instance to test instance?

Asked In :- CodeBlock Technologies, qBotica,

Right Answer:
To migrate a .rdf file from a development instance to a test instance, follow these steps:

1. **Export the .rdf file** from the development instance using the Oracle Reports Builder or command line.
2. **Transfer the .rdf file** to the test instance using a secure method like FTP or SCP.
3. **Import the .rdf file** into the test instance using Oracle Reports Builder or command line.
4. **Compile the report** in the test instance to ensure it is ready for use.

Database Analyst/ Programmer Oracle

Ques:- What are the type of triggers available in Oracle Reports ?

Asked In :- OCR Services,

Right Answer:
The types of triggers available in Oracle Reports are:

1. Before Report
2. After Report
3. Before Page
4. After Page
5. Before Data
6. After Data
7. Before Parameter Form
8. After Parameter Form
9. Before Field
10. After Field

Database Analyst/ Programmer Oracle

Ques:- Can a table has a column that has only view data and in other columns we can change data?

Asked In :- MAK Controls & Systems, Technoflair Solutions,

Right Answer:
No, a table cannot have a column that only displays data from a view while allowing changes in other columns. All columns in a table can store data, but you can achieve similar functionality using a view that presents data from the table.

Database Analyst/ Programmer Oracle

Ques:- After using set unused can we enable the column again to use?Please give me some answers….

Asked In :- Chella Software, cartrack,

Right Answer:
No, once a column is marked as unused using the `SET UNUSED` command, it cannot be enabled or used again.

Database Analyst/ Programmer Oracle

Ques:- Can we create aliases for every table beforehand? if yeswhar are the disadvantages?

Asked In :- storehub,

Right Answer:
Yes, we can create aliases for tables beforehand in SQL queries. However, the disadvantages include potential confusion with multiple aliases, increased complexity in query readability, and the possibility of naming conflicts if not managed properly.

Database Analyst/ Programmer Oracle

Ques:- ORA-00205: error in identifying controlfile, check alert logfor more info

Asked In :- GrayMatter Software Services, asticom technology inc.,

Right Answer:
The ORA-00205 error indicates that the Oracle database cannot find the control file. To resolve this, check the alert log for details, ensure the control file path is correctly specified in the initialization parameter file (init.ora or spfile), and verify that the control file exists in the specified location. If necessary, restore the control file from a backup.

Database Analyst/ Programmer Oracle

Ques:- What is the difference between Recurring Journals andRecurring Invoices? What is the need for the RecurringJournals in GL when Recurring invoices exist in AP?

Asked In :- moschip semiconductor, core ecs,

Right Answer:
Recurring Journals are used in General Ledger (GL) to automate the posting of journal entries at regular intervals, while Recurring Invoices are used in Accounts Payable (AP) to automate the creation of invoices for regular payments. The need for Recurring Journals in GL exists because they allow for the recording of financial transactions that do not originate from invoices, such as adjustments or allocations, which are essential for accurate financial reporting.

The Oracle section on takluu.com is tailored for professionals and aspirants aiming to excel in Oracle database administration, development, and optimization roles. Oracle remains one of the most widely used enterprise database systems, powering critical applications worldwide.

This category covers comprehensive topics including Oracle Architecture, SQL and PL/SQL programming, database backup and recovery, performance tuning, security management, and Oracle RAC (Real Application Clusters). You’ll also find detailed explanations of core concepts like tablespaces, datafiles, undo management, indexing, and partitioning.

Our content focuses on practical skills essential for roles such as Oracle DBA, PL/SQL Developer, and Database Engineer. We include real interview questions and scenario-based problems designed to test your troubleshooting abilities, SQL proficiency, and understanding of Oracle internals.

Beyond technical topics, we cover best practices for backup strategies, disaster recovery, and security implementation to help you manage Oracle databases efficiently and securely. With mock interview questions, step-by-step guides, and example scripts, this section is a one-stop resource for Oracle exam and job interview preparation.

Whether you’re a fresher or an experienced professional, our structured modules and updated content ensure you stay aligned with current industry standards and Oracle versions.

At Takluu, we focus on turning theoretical knowledge into practical expertise, empowering you to crack your Oracle interview and manage databases confidently from day one.

Questions in: Oracle

What makes Takluu valuable for interview preparation?

Get Our Mobile App

Programming

Reasoning

Network & Telecom

Management

What makes Takluu valuable for interview preparation?