Oracle Interview Questions, Process, and Tips

Q1. Reverse a linked list
Ans. 
Reverse a linked list by changing the next pointers of each node to point to the previous node.
• Start with three pointers: current, previous, and next.

• Iterate through the linked list, updating the next pointer of each node to point to the previous node.

• Update the previous, current, and next pointers for each iteration.
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Q2. Distribute candies among students with ratings
Ans. 
Distribute candies among students based on their ratings, ensuring higher rated students get more candies.
• Create an array to store the ratings of each student

• Initialize another array to store the number of candies each student will receive

• Start by giving each student 1 candy

• Iterate over the ratings array from left to right, comparing each student's rating with the previous one and adjusting the candies accordingly
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Q3. How do we serialize data
Ans. 
Data serialization is the process of converting data structures or objects into a format that can be stored or transmitted.
• Serialization involves converting data into a byte stream for storage or transmission.

• Common serialization formats include JSON, XML, and Protocol Buffers.

• Serialization allows data to be easily saved to a file or sent over a network.

• Deserialization is the reverse process of converting serialized da
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Q4. What is data shuffling in spark
Ans. 
Data shuffling in Spark is the process of redistributing data across partitions to optimize parallel processing.
• Data shuffling occurs when data needs to be moved across partitions, typically during operations like groupBy, join, or sortBy.

• It involves transferring data between executors, which can be a costly operation in terms of performance.

• Data shuffling can impact the performance of a Spark job, so it's important to...read more
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Q5. Explain the functioning of map-reduce
Ans. 
Map-reduce is a programming model used for processing and generating large data sets in parallel.
• Map function processes input data and generates key-value pairs

• Reduce function takes the output of the map function and combines the values with the same key

• Example: Word count in a document - map function counts occurrences of each word, reduce function sums up the counts
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Q6. Micro service architecture: Handling service down-time
Ans. 
Handling service downtime in microservice architecture is crucial for maintaining system reliability.
• Implement circuit breakers to prevent cascading failures

• Use service discovery to automatically route traffic to healthy instances

• Implement retry mechanisms with exponential backoff to handle transient failures

• Monitor service health and performance metrics to proactively detect issues

• Implement graceful degradation to pro
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Q7. Micro service architecture: Handling too many requests
Ans. 
Implement rate limiting, load balancing, and circuit breaking to handle too many requests in micro service architecture.
• Implement rate limiting to control the number of requests a service can handle within a specific time frame.

• Use load balancing to distribute incoming requests evenly across multiple instances of a service.

• Implement circuit breaking to prevent cascading failures and overload in case of high traffic.

• Con...read more
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Topics-Arrays,Sliding Window

Missing numbers,C,C++,OS,OOPS etc

Q1. Merge Intervals
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Q2. Combinations of elements in array
Ans. 
Find all possible combinations of elements in an array of strings
• Use recursion to generate all possible combinations

• Keep track of visited elements to avoid duplicates

• Consider the order of elements in the combinations

• Example: Given array ['A', 'B', 'C'], possible combinations are ['A', 'B', 'C', 'AB', 'AC', 'BC', 'ABC']
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Q1. Update about profile and Projects
Ans. 
I have a diverse background in product management with experience in launching successful projects.
• Managed cross-functional teams to launch new products

• Implemented agile methodologies to improve project efficiency

• Led market research to identify customer needs and preferences
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Q2. How BRM works in Telco, and how we can launch in market
Ans. 
BRM in Telco involves managing relationships with business partners to launch new products in the market.
• BRM in Telco focuses on building and maintaining relationships with business partners such as vendors, suppliers, and distributors.

• It involves negotiating contracts, setting up agreements, and ensuring smooth collaboration between all parties involved.

• To launch a new product in the market, BRM plays a crucial role i...read more
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Mcqs+ 1 coding test. Solved all

Q1. Longest string with no repeating character
Ans. 
Find the longest string in an array with no repeating characters.
• Iterate through each string in the array

• Use a set to keep track of characters seen so far

• Update the longest string found without repeating characters
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Q2. Generate paranthesis
Ans. 
Generate all valid combinations of parentheses for a given number n
• Use backtracking to generate all possible combinations of opening and closing parentheses

• Keep track of the number of opening and closing parentheses used

• Add opening parentheses if there are remaining to be used, and add closing parentheses if it won't create an invalid combination
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Dsa aptitude array programming

Q1. Sql queries , graphs algorithms
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Q2. Dijkstras algorithm
Ans. 
Dijkstra's algorithm is a graph search algorithm that finds the shortest path between nodes in a graph.
• Dijkstra's algorithm is used to find the shortest path from a starting node to all other nodes in a weighted graph.

• It works by maintaining a priority queue of nodes based on their distance from the starting node.

• The algorithm iteratively selects the node with the smallest distance, updates the distances of its neighbo...read more
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