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

Ques:- Physical standby database

Asked In :- HUBCO, lothian buses,

Right Answer:
A physical standby database is a replica of the primary database that maintains an exact copy of the primary's data files, using redo data received from the primary database to stay synchronized. It is used for disaster recovery and can be opened in read-only mode for reporting purposes.

Database Administrator (dba) Oracle

Ques:- Backup and Recovery techniques including cold and hot backup

Asked In :- Damco Solutions, Data Patterns, Smarter BIZ Technologies, KJ System, arbisoft, wetransfer,

Right Answer:
Cold backup involves shutting down the database and copying the data files, control files, and redo logs, ensuring data consistency. Hot backup, on the other hand, allows the database to remain online while backing up data files, typically using Oracle's "ALTER DATABASE BEGIN BACKUP" command to ensure data integrity during the process. Both techniques are essential for recovery, with cold backups being simpler and hot backups providing higher availability.

Database Administrator (dba) Oracle

Ques:- Oracle Architecture – Shared Pool and SGA

Asked In :- itron, scan-it,

Right Answer:
The System Global Area (SGA) is a shared memory area that contains data and control information for an Oracle database instance. The Shared Pool is a component of the SGA that stores shared SQL areas, PL/SQL code, and data dictionary information to optimize performance by reducing the need for disk I/O.

Oracle

Ques:- Cursors,autonomous transaction, Mostly on java

Asked In :-

Right Answer:
Cursors in Oracle are used to retrieve and manipulate data row by row. An autonomous transaction allows a transaction to be executed independently of the main transaction, meaning it can commit or roll back without affecting the main transaction. In Java, you can use JDBC to manage cursors and autonomous transactions by executing SQL statements and handling connections accordingly.

Database Analyst/ Programmer Oracle

Ques:- About my OCA and OCP Certifications

Asked In :-

Right Answer:
The OCA (Oracle Certified Associate) certification demonstrates foundational knowledge of Oracle databases, while the OCP (Oracle Certified Professional) certification indicates advanced skills and expertise in Oracle database administration and development.

Database Analyst/ Programmer Oracle

Ques:- The Users are not able to save the data, as a BASIS ADMIN meto not able to save, what is the problem would be..?

Asked In :- Harrier Information Systems,

Right Answer:
The problem could be due to insufficient user permissions, database connectivity issues, or a locked database object.

Database Analyst/ Programmer Oracle

Ques:- What is BDC?

Asked In :- tradebyte software gmbh,

Right Answer:
BDC stands for Batch Data Communication, a method in SAP for transferring data in bulk from external sources into the SAP system.

Database Analyst/ Programmer Oracle

Ques:- ORA-06535: statement string in string is NULL or 0 length

Asked In :- hibob,

Right Answer:
The ORA-06535 error occurs when a PL/SQL statement or block is null or has a length of zero. To resolve this, ensure that the SQL statement being executed is properly defined and not empty.

Database Analyst/ Programmer Oracle

Ques:- ORA-23421: job number string is not a job in the job queue

Asked In :- Allegion,

Right Answer:
The error ORA-23421 indicates that the specified job number does not exist in the job queue. This can occur if the job has already been completed, has been dropped, or if the job number is incorrect. To resolve this, verify the job number and check the job queue for existing jobs.

Database Analyst/ Programmer Oracle

Ques:- What is the purpose of standard cost update?

Asked In :- evoke technologies,

Right Answer:
The purpose of standard cost update is to adjust the standard costs of products to reflect changes in production costs, ensuring accurate financial reporting and inventory valuation.

Database Analyst/ Programmer Oracle

Ques:- In my table i'm having the duplicate records with sequencenumber and my requirement is when in new record is coming iwant to delete existing old record(onlyone i.e maintaing thepartial duplicate date )and add new record

Asked In :- FreJun,

Right Answer:
You can achieve this using a combination of a DELETE statement and an INSERT statement. First, delete the existing record with the same sequence number, then insert the new record. Here’s an example SQL code:

```sql
DELETE FROM your_table
WHERE sequence_number = :new_sequence_number;

INSERT INTO your_table (columns)
VALUES (new_values);
```

Replace `your_table`, `sequence_number`, `:new_sequence_number`, `columns`, and `new_values` with your actual table name, column names, and values.

Database Analyst/ Programmer Oracle

Ques:- What are the Major differences between appcore.pll and appcore2.pll

Asked In :- GeoSpoc, radixweb,

Right Answer:
The major differences between appcore.pll and appcore2.pll are:

1. **Versioning**: appcore2.pll is an updated version of appcore.pll, incorporating enhancements and new features.
2. **Functionality**: appcore2.pll includes additional procedures and functions that improve performance and usability compared to appcore.pll.
3. **Compatibility**: appcore2.pll may have better compatibility with newer Oracle Forms versions and technologies.
4. **Bug Fixes**: appcore2.pll addresses bugs and issues present in appcore.pll, providing a more stable experience.

Database Analyst/ Programmer Oracle

Ques:- How do we see the data in Cluster table?

Asked In :- Techvaria Solutions, sabia inc.,

Right Answer:
To see the data in a cluster table, you can use a standard SQL SELECT statement. For example:

```sql
SELECT * FROM cluster_table_name;
```

Replace `cluster_table_name` with the actual name of your cluster table.

Database Analyst/ Programmer Oracle

Ques:- What is relational database ? Give me an example !

Asked In :-

Right Answer:
A relational database is a type of database that stores data in tables, which are structured in rows and columns. Each table represents a different entity, and relationships between tables are established using keys. An example of a relational database is Oracle Database.

Database Analyst/ Programmer Oracle

Ques:- What is cursor and where do you use them?

Asked In :- Walking Tree Consultancy Services pvt, K2,

Right Answer:
A cursor is a database object used to retrieve, manipulate, and navigate through a result set row by row. Cursors are used in situations where you need to process individual rows returned by a query, such as when performing operations that require multiple steps for each row, like updates or calculations.

Database Analyst/ Programmer Oracle

Ques:- ORA-26027: unique index string.string partition stringinitially in unusable state

Asked In :- Gentrack,

Right Answer:
The error ORA-26027 indicates that a unique index is in an unusable state for a partition. 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.

Database Analyst/ Programmer Oracle

Ques:- Define the difference between cycle counting and physical inventory?

Asked In :- JIBE DEVELOPMENT SERVICES, Extentia, MindNerves Technologies, gx software,

Right Answer:
Cycle counting is a continuous inventory auditing process where a subset of inventory is counted on a specific schedule, while physical inventory is a complete count of all inventory items at a specific point in time, usually conducted annually or periodically.

Database Analyst/ Programmer Oracle

Ques:- How to create zoneusers

Asked In :- Invensis Technologies, dsg, inc., tsi,

Right Answer:
To create zone users in Oracle, you can use the following SQL command:

```sql
CREATE USER zoneuser IDENTIFIED BY password;
```

Replace `zoneuser` with the desired username and `password` with a secure password. After creating the user, you may need to grant necessary privileges:

```sql
GRANT CREATE SESSION TO zoneuser;
```

Database Analyst/ Programmer Oracle

Ques:- Name at least five reports in oracle inventory related totransaction ?

Asked In :- Exafluence, ginkgo bioworks, inc.,

Right Answer:
1. Inventory Transaction Report
2. Inventory Valuation Report
3. Cycle Count Variance Report
4. Material Transactions Report
5. Stock Status Report

Database Analyst/ Programmer Oracle

Ques:- How to call a stored procedure inside a trigger? Give an example.

Asked In :- Netcracker Technology,

Right Answer:
To call a stored procedure inside a trigger in Oracle, you can use the following syntax:

```sql
CREATE OR REPLACE TRIGGER my_trigger
AFTER INSERT ON my_table
FOR EACH ROW
BEGIN
my_stored_procedure(:new.column_name);
END;
/
```

In this example, `my_trigger` is the trigger that fires after an insert on `my_table`, and it calls the stored procedure `my_stored_procedure`, passing a value from the newly inserted row.

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.

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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.

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