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Oracle Interview Questions and Answers
692 Interview questions
The TUNATE function is used to format strings in SQL, often for display purposes.
TUNATE is not a standard SQL function; it may refer to a specific database's string manipulation function.
In some databases, similar functions like TRIM or SUBSTRING can be used for string formatting.
Example: SELECT TRIM(column_name) FROM table_name; to remove spaces from a string.
Modifying tables in SQL involves using commands like ALTER TABLE to change structure or data types.
Use ALTER TABLE to add a new column: ALTER TABLE table_name ADD column_name datatype;
To modify an existing column's data type: ALTER TABLE table_name MODIFY column_name new_datatype;
To drop a column: ALTER TABLE table_name DROP COLUMN column_name;
To rename a column: ALTER TABLE table_name RENAME COLUMN old_name TO ne...
Creating a user account in SQL involves defining the user, setting permissions, and managing roles.
Use the CREATE USER statement: `CREATE USER username IDENTIFIED BY password;`
Assign roles and privileges: `GRANT role_name TO username;`
Set default tablespace: `ALTER USER username DEFAULT TABLESPACE tablespace_name;`
Verify user creation: `SELECT * FROM dba_users WHERE username = 'username';`
DDL commands in SQL define and manage database structures like tables, schemas, and indexes.
CREATE: Used to create new database objects. Example: CREATE TABLE employees (id INT, name VARCHAR(100));
ALTER: Used to modify existing database objects. Example: ALTER TABLE employees ADD COLUMN age INT;
DROP: Used to delete database objects. Example: DROP TABLE employees;
TRUNCATE: Used to remove all records from a table wi...
Deleting tables in SQL involves using the DROP TABLE command to remove the table and its data permanently.
Use the DROP TABLE statement: Example: DROP TABLE table_name;
Ensure you have the necessary permissions to delete the table.
Be cautious as this action is irreversible and will delete all data in the table.
You can delete multiple tables at once: Example: DROP TABLE table1, table2;
Consider using the CASCADE optio...
A SQL query using joins combines data from multiple tables based on related columns.
Joins are used to retrieve data from two or more tables.
Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN.
Example of INNER JOIN: SELECT a.name, b.order_date FROM customers a INNER JOIN orders b ON a.id = b.customer_id;
LEFT JOIN retrieves all records from the left table and matched records from the right ...
Permissions in SQL can be granted using the GRANT statement to control user access to database objects.
Use the GRANT statement to assign permissions: `GRANT SELECT ON table_name TO user_name;`
Multiple permissions can be granted at once: `GRANT SELECT, INSERT ON table_name TO user_name;`
Permissions can be granted to roles, which can then be assigned to users: `GRANT role_name TO user_name;`
To grant all permissions ...
While loops repeat until a condition is false; if statements execute once based on a condition.
While loops continue executing as long as the condition is true. Example: 'while (x < 10) { x++; }'
If statements execute a block of code only once if the condition is true. Example: 'if (x < 10) { x++; }'
While loops are useful for situations where the number of iterations is not known beforehand.
If statements are u...
Design a scalable social media platform for microblogging, focusing on user interactions and real-time updates.
User Authentication: Implement OAuth for secure login and user management.
Tweet Storage: Use a distributed database like Cassandra for storing tweets.
Feed Generation: Utilize a fan-out on write approach to generate user timelines.
Real-time Updates: Use WebSockets for real-time notifications and updates.
Sc...
ODI 12c is Oracle Data Integrator, a comprehensive data integration platform for high-performance data movement and transformation.
Data Integration: ODI 12c supports various data sources, enabling seamless integration across databases, applications, and big data environments.
ELT Architecture: It employs an Extract, Load, Transform (ELT) approach, allowing data to be transformed in the target database, improving pe...
Oracle Interview Experiences
894 interviews found
Anonymous
Selected
I applied via Referral and was interviewed in Jul 2022. There were 2 interview rounds.
(4 Questions)
- Q1. How much equipment needed to be done for make one access door ?
- Ans.
The amount of equipment needed to make one access door varies depending on the specific requirements and design of the door.
The type of access door (e.g. metal, wood, glass) will determine the necessary equipment.
Common equipment includes measuring tools, cutting tools (e.g. saw, drill), hinges, screws, and a door handle.
Additional equipment may be needed for specialized features such as locks, insulation, or decorativ...
- Q2. Types of fire extinguisher ?
- Ans.
There are five main types of fire extinguishers: water, foam, carbon dioxide, dry powder, and wet chemical.
Water extinguishers are suitable for Class A fires involving solid materials like wood or paper.
Foam extinguishers are effective for Class A and B fires, which involve flammable liquids like gasoline or oil.
Carbon dioxide extinguishers are used for Class B and C fires, which involve flammable gases or electrical e...
- Q3. Full form of access ?
- Ans.
Access stands for Automated Community Connection to Economic Self-Sufficiency.
Access is a program in the United States that provides assistance to low-income individuals and families.
It offers various services such as healthcare, food stamps, cash assistance, and child care subsidies.
Access aims to help people achieve economic self-sufficiency and improve their quality of life.
The program is administered by the Departm...
- Q4. Full form of fire ?
- Ans.
The full form of FIRE is not an acronym, it is a word that refers to the rapid oxidation of a material in the chemical process of combustion.
FIRE is not an acronym, it is a word that refers to the rapid oxidation of a material in the chemical process of combustion
It is a chemical reaction that releases heat and light
Examples of materials that can undergo combustion and produce fire include wood, gasoline, and paper
Interview Preparation Tips
- Gather information about company
Generally he ask for self introduction.
Skills evaluated in this interview
I appeared for an interview in Jan 2025.
Numerical reasoning : Tests mathematical skills,such as number sequences,percentages,and ratios.
(6 Questions)
- Q1. What is the difference between static and dynamic typing in python?
- Ans.
Static typing requires variable types to be declared at compile time, while dynamic typing allows types to be determined at runtime.
Static typing requires explicit declaration of variable types, while dynamic typing infers types at runtime.
Static typing helps catch errors at compile time, while dynamic typing may lead to runtime errors.
Python is dynamically typed, but can be used with type hints for static type checkin...
- Q2. What is the difference between list and touple in python?
- Ans.
Lists are mutable, ordered collections of items, while tuples are immutable, ordered collections of items.
Lists are defined using square brackets [], while tuples are defined using parentheses ().
Lists can be modified after creation (mutable), while tuples cannot be modified (immutable).
Lists are typically used for collections of similar items that may need to be changed, while tuples are used for fixed collections of ...
- Q3. Data structures and algorithms
- Q4. Object oriented programming
- Q5. File handling and database
- Q6. Advanced python topics
Gd Topics:
1.Current affairs
2.Business and Economy
3.Social and Cultural
(6 Questions)
- Q1. CN you tell me about your self?
- Ans.
I am a passionate Python developer with experience in web development and data analysis.
Experienced in Python programming language
Proficient in web development using Django framework
Skilled in data analysis with libraries like Pandas and NumPy
- Q2. Why do you want to work as a python developer?
- Ans.
I am passionate about coding and enjoy problem-solving using Python.
I have a strong interest in programming and have been learning Python for a while.
I find Python to be a versatile and powerful language that can be used in various applications.
I enjoy the challenge of writing efficient and clean code to solve complex problems.
I believe working as a Python developer will allow me to further enhance my skills and contri...
- Q3. Career goals and motivation
- Q4. Team work and communication
- Q5. Problem solving and adaptability
- Q6. Behavioral questions
Interview Preparation Tips
2.practice interview skills
3.Follow the interview tips
Selected
I appeared for an interview in Dec 2024.
(2 Questions)
- Q1. What is ipconf.pl?
- Ans.
ipconf.pl is a Perl script used for configuring network interfaces on Linux systems.
ipconf.pl is typically used to set up IP addresses, netmasks, gateways, and DNS servers on Linux machines.
It can be used to automate the configuration of network interfaces during system setup or maintenance.
The script may also be used to troubleshoot network connectivity issues by checking and modifying network settings.
ipconf.pl is of...
- Q2. What is the difference between scan vip & node vip?
- Ans.
Scan VIP is used for load balancing traffic to multiple nodes, while Node VIP is assigned to a specific node for direct access.
Scan VIP is a virtual IP address used for load balancing traffic across multiple nodes in a cluster.
Node VIP is a virtual IP address assigned to a specific node in the cluster for direct access.
Scan VIP is typically used for services that need to be highly available and distributed across multi...
(3 Questions)
- Q1. What is quarantile in Exadata?
- Ans.
Quarantile in Exadata is a feature that isolates problematic cells to prevent them from affecting the rest of the system.
Quarantile is a feature in Exadata that identifies and isolates cells that are experiencing issues or failures.
It helps prevent the spread of issues to other cells in the system, ensuring high availability and performance.
Quarantiled cells are still accessible for diagnosis and maintenance, but are n...
- Q2. How to identify the master switch in Exadata?
- Ans.
The master switch in Exadata can be identified by checking the status of the cell server software.
Check the status of the cell server software using the 'cellcli' command
The cell server with the 'MS' role is the master switch
The master switch can also be identified by checking the 'cellinit.ora' file
- Q3. What is spine switch & leaf switch in exadata?
- Ans.
Spine switch and leaf switch are networking components in Exadata used for connecting database servers and storage servers.
Spine switch acts as the core of the network, connecting all leaf switches and providing high-speed connectivity.
Leaf switches connect database servers and storage servers to the spine switch, facilitating communication between them.
Exadata uses a leaf-spine network architecture for efficient data ...
One of the node of a 3 node cluster is down. Explain the step by step process to troubleshoot the issue.
Shell script & terraform code output was asked.
Selected
I applied via Company Website and was interviewed in Dec 2024. There were 2 interview rounds.
(2 Questions)
- Q1. What are joins in SQL, and what are the different types?
- Ans.
Joins in SQL are used to combine rows from two or more tables based on a related column between them.
Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.
INNER JOIN returns rows when there is at least one match in both tables.
LEFT JOIN returns all rows from the left table and the matched rows from the right table.
RIGHT JOIN returns all rows from the right table and the matched rows from the left tabl...
- Q2. What is the method to find the third highest salary in a dataset?
- Ans.
Use the SQL query with ORDER BY and LIMIT to find the third highest salary.
Use the SQL query: SELECT DISTINCT Salary FROM Employees ORDER BY Salary DESC LIMIT 2, 1
The above query will return the third highest salary from the 'Employees' table
Make sure to replace 'Employees' and 'Salary' with the appropriate table and column names
(2 Questions)
- Q1. How do you manage multiple clients simultaneously?
- Ans.
I prioritize tasks, set clear expectations, utilize time management tools, and communicate effectively.
Prioritize tasks based on urgency and importance
Set clear expectations with clients regarding response times and availability
Utilize time management tools such as calendars and task lists
Communicate effectively with clients to provide updates and manage expectations
- Q2. How do you determine which issue to prioritize when faced with multiple problems?
- Ans.
I prioritize issues based on impact, urgency, and complexity.
Assess the impact of each issue on the system or users
Consider the urgency of resolving each issue
Evaluate the complexity of fixing each issue
Prioritize critical issues that have high impact, urgency, and low complexity
Create a priority list based on these factors
I applied via Company Website and was interviewed in Oct 2024. There were 3 interview rounds.
It was a coding round interview along with interviewer via Virtual mode. I was given 2 coding questions on HackerRank for the interview:
1. one was an easy problem on counting minimum replacements.
2. "pat is an ordinary kid who works hard to be a great runner...." this was a challenging problem (which I managed to solve).
3. I was asked some basic Python questions, as the role was for a Python Developer.
(5 Questions)
- Q1. LLD for Parking Lot
- Ans.
Design a parking lot system to manage parking spaces, vehicles, and payment processing.
Define core classes: ParkingLot, ParkingSpace, Vehicle, Ticket, and Payment.
ParkingLot manages multiple ParkingSpaces and keeps track of available spots.
ParkingSpace can be of different types: Compact, Regular, and Handicapped.
Vehicle class holds information like license plate, size, and type.
Ticket class generates a unique ID for ea...
- Q2. Which database are you going to use for Parking lot and Why ?
- Ans.
I would use a relational database like MySQL for the Parking lot as it provides structured data storage and supports complex queries.
Relational databases like MySQL offer structured data storage for parking lot information
Supports complex queries for managing parking lot data efficiently
Ability to handle large amounts of data and transactions
Provides data integrity and security features
Can easily integrate with other s...
- Q3. Questions related to OOPs
- Q4. Questions related to Multi Threading
- Q5. Questions related to Projects
(2 Questions)
- Q1. I hate this since i was informed that this round was a technical.
- Q2. Usual Mangerial questions, Project Related, etc
Interview Preparation Tips
Selected
I applied via Campus Placement and was interviewed in Aug 2024. There were 4 interview rounds.
Round 1: HackerRank Test (100 Minutes)
1 DSA question (medium level, binary search on answers)
20 technical questions (OS, DBMS, CN, and other CS fundamentals)
15 general aptitude and communication questions
(7 Questions)
- Q1. What is static and dynamic binding in java
- Ans.
Static binding is resolved at compile time while dynamic binding is resolved at runtime in Java.
Static binding is also known as early binding.
Dynamic binding is also known as late binding.
Example of static binding: method overloading.
Example of dynamic binding: method overriding.
- Q2. Sort the linked list
- Ans.
Sorting a linked list involves rearranging the nodes in a specific order.
Iterate through the linked list and compare each node with the next one
Use a sorting algorithm like bubble sort, merge sort, or quick sort to rearrange the nodes
Update the pointers to connect the nodes in the sorted order
- Q3. What are JAR files?
- Ans.
JAR files are Java Archive files that store multiple Java class files and related metadata.
JAR files are used to package Java classes, resources, and metadata into a single file.
They are commonly used for distributing Java libraries or applications.
JAR files can be created using the 'jar' command in Java.
They can also be executed using the 'java -jar' command.
Example: mylibrary.jar contains all the class files and reso...
- Q4. Singleton Class example
- Ans.
A Singleton class is a class that can only have one instance created at a time.
Singleton classes are often used for managing resources that should only have one instance, such as a database connection.
To implement a Singleton class, you typically make the constructor private and provide a static method to access the single instance.
Example: Singleton class for logging system where only one instance of the logger is nee...
- Q5. CAP Theorem and its trade-offs
- Ans.
CAP Theorem states that in a distributed system, it is impossible to simultaneously guarantee consistency, availability, and partition tolerance.
Consistency: All nodes in the system have the same data at the same time.
Availability: Every request gets a response, even if some nodes are down.
Partition Tolerance: The system continues to operate despite network partitions.
Trade-offs: In a distributed system, you can only h...
- Q6. Given 2–3 tables, wrote SQL queries based on joins and basic subqueries
- Ans.
SQL queries using joins and subqueries to retrieve data from multiple tables.
Use INNER JOIN to combine rows from two or more tables based on a related column.
Example: SELECT * FROM Orders INNER JOIN Customers ON Orders.CustomerID = Customers.CustomerID;
LEFT JOIN retrieves all records from the left table and matched records from the right table.
Example: SELECT * FROM Products LEFT JOIN Categories ON Products.CategoryID ...
- Q7. Explain wait() and signal()
- Ans.
wait() and signal() are functions used for synchronization in multithreading.
wait() is used to make a thread wait until a certain condition is met
signal() is used to wake up a waiting thread when the condition is met
Example: Producer-consumer problem where producer signals consumer to consume when a new item is produced
(3 Questions)
- Q1. Design schema and draw ER diagram for Airport Management System
- Ans.
Airport Management System schema and ER diagram design
Entities: Airport, Flight, Passenger, Employee, Schedule
Attributes: Airport (code, name, location), Flight (number, destination, departure time), Passenger (name, age, contact info), Employee (ID, name, role), Schedule (flight number, date, time)
Relationships: Airport has many Flights, Flight has many Passengers, Employee works at Airport, Flight has Schedule
- Q2. Normalize a given table; I normalized it up to 3NF.
- Ans.
Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity.
Identify the functional dependencies in the table
Eliminate partial dependencies by breaking the table into multiple tables
Eliminate transitive dependencies by further breaking down the tables
Ensure each table has a primary key and all non-key attributes are fully functionally dependent on the primary key
- Q3. In-depth projects analysis
(4 Questions)
- Q1. Explain REST with examples
- Ans.
REST is an architectural style for designing networked applications
REST stands for Representational State Transfer
It uses standard HTTP methods like GET, POST, PUT, DELETE
Resources are identified by URIs
Data is transferred in JSON or XML format
Example: GET request to 'https://api.example.com/users' to retrieve a list of users
- Q2. Differences between PUT and POST, and write POST method
- Ans.
PUT is used to update or replace an existing resource, while POST is used to create a new resource.
PUT is idempotent, meaning multiple identical requests will have the same effect as a single request
POST is not idempotent, meaning multiple identical requests may have different effects
PUT is used to update an existing resource at a specific URI
POST is used to create a new resource under a specific URI
Example: PUT /users...
- Q3. Discussion about status codes
- Q4. Various HTTP requests and CRUD operations
Interview Preparation Tips
- OS
- DBMS
- SQL
- Java
- Rest
- Machine Learning
- DSA
- Data Structures
Only include skills on your resume that you’re confident in.
If you’re stuck on a question, don’t panic. Just tell the interviewer what you’re thinking.
If a question isn’t clear, don’t hesitate to ask for clarification; it’s better to fully understand than to guess.
Express your ideas clearly and explain your thought process. Good communication helps the interviewer understand your skills and how you approach problems.
Prepare a few thoughtful questions to ask the interviewer. This shows that you’re interested in the job and have done your research.
Skills evaluated in this interview
I applied via Approached by Company and was interviewed in Oct 2024. There were 2 interview rounds.
(3 Questions)
- Q1. Java basic questions.
- Q2. Rest basics methods like get, post, put, delete etc
- Q3. Given a directory name, write a program to return a list of all .tst files present in the directory and its sub directories.
- Ans.
Program to return list of .tst files in given directory and subdirectories
Use recursion to traverse through all directories and subdirectories
Check if each file has .tst extension and add to list if true
Use built-in functions like os.listdir() and os.path.splitext() in Python
(4 Questions)
- Q1. Difference between == and equals
- Ans.
The '==' operator is used for comparing values of primitive data types, while the 'equals' method is used for comparing objects in Java.
Use '==' to compare primitive data types like int, char, boolean, etc.
Use 'equals' method to compare objects like Strings, Lists, etc.
Example: int a = 5; int b = 5; if(a == b) { // true }
Example: String str1 = 'hello'; String str2 = 'hello'; if(str1.equals(str2)) { // true }
- Q2. Use case of abstract class and interfaces
- Ans.
Abstract classes are used to provide a common base for multiple classes, while interfaces define a contract for classes to implement.
Abstract classes can contain both abstract and concrete methods, while interfaces can only have abstract methods.
Abstract classes can have constructors, while interfaces cannot.
Interfaces allow for multiple inheritance, while classes can only inherit from one abstract class.
Abstract class...
- Q3. Singleton design pattern. Explain and implement (thread safe)
- Ans.
Singleton design pattern ensures a class has only one instance and provides a global point of access to it.
Ensure a private static instance variable in the class.
Provide a public static method to access the instance, creating it if necessary.
Use synchronized keyword or double-checked locking to make it thread-safe.
- Q4. Merge sort. Explain and implement.
- Ans.
Merge sort is a divide and conquer algorithm that divides the input array into two halves, sorts each half, and then merges the sorted halves.
Divide the array into two halves
Recursively sort each half
Merge the sorted halves back together
Interview Preparation Tips
- Java
- Spring
- DSA
- REST API
- SOAP
Skills evaluated in this interview
Swati Ambule
(4 Questions)
- Q1. What is java and explain oopes concept
- Ans.
Java is a popular programming language used for developing various applications. OOPs (Object-Oriented Programming) is a programming paradigm based on the concept of objects.
Java is a class-based, object-oriented programming language.
OOPs concepts include encapsulation, inheritance, polymorphism, and abstraction.
Encapsulation is the bundling of data and methods that operate on the data into a single unit.
Inheritance al...
- Q2. What is testing explain types
- Ans.
Testing is the process of evaluating a software application to identify defects or bugs.
Types of testing include unit testing, integration testing, system testing, acceptance testing, and regression testing.
Unit testing involves testing individual components or modules of the software.
Integration testing checks if different modules work together correctly.
System testing evaluates the entire system's functionality.
Accep...
- Q3. What is exceptions handling
- Q4. Locators in automation selenium
- Ans.
Locators in automation selenium are used to identify web elements on a webpage for testing purposes.
Locators include ID, class name, name, tag name, link text, partial link text, and xpath.
ID is the most efficient locator as it is unique for each element.
Xpath is powerful but can be slow and brittle if not used correctly.
Using CSS selectors can also be a good alternative to xpath.
It is important to choose the right loc...
Skills evaluated in this interview
Selected
(2 Questions)
- Q1. What are some common questions related to Linux Administration?
- Q2. Can you provide details on how to write shell scripts to automate basic tasks while handling input parameters?
Interview Preparation Tips
sathish n
I appeared for an interview in Dec 2024.
Basic aptitude questions and two coding questions were asked.
(2 Questions)
- Q1. Introduce yourself
- Ans.
I am a dedicated and experienced Programmer Analyst with a strong background in software development and system analysis.
Over 5 years of experience in programming and analyzing software systems
Proficient in languages such as Java, C++, and SQL
Skilled in conducting system analysis and designing solutions
Strong problem-solving and communication skills
Previous projects include developing a web-based inventory management s...
- Q2. Question in dbms, skills, about oracle
(2 Questions)
- Q1. Basic hr questions
- Q2. Basic hr questions
Interview Preparation Tips
I applied via Referral and was interviewed in Oct 2024. There was 1 interview round.
(3 Questions)
- Q1. Questions about OOPS includes inheritence, interface, abstract classes, access specifiers
- Q2. Coding question: given a vector, return a vector where each entry in the resultant vector is the product of the remaining elements in the given vector.
- Ans.
Return a vector where each entry is the product of all other elements in the given vector.
Use a two-pass approach: first calculate the prefix products, then the suffix products.
Example: For input [1, 2, 3, 4], prefix products are [1, 1, 2, 6] and suffix products are [24, 12, 4, 1].
Multiply corresponding prefix and suffix products to get the result: [24, 12, 8, 6].
Consider edge cases: empty vector returns empty vector, ...
- Q3. Coding question: given a vector numbers, return the index of the vector which has the longest length palindrome
Interview Preparation Tips
- oops
- C++
- Java
- Python
- DSA
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