300+ Technology Analyst Interview Questions and Answers

Implement a function to sort an array of 0s and 1s in linear time complexity without using additional arrays.

• Iterate through the array and maintain two pointers, one for 0s and one for 1s.

• Swap elements at the two pointers to sort the array in place.

• Time complexity should be O(N) where N is the size of the array.

The problem involves finding the smallest set of vertices from which all nodes in a directed acyclic graph are reachable.

• Create a directed graph using the given edges.

• Perform a topological sort to find the vertices that can reach all other nodes.

• Output the smallest set of vertices in sorted order.

Possible reasons for an atomic spark job running for more than an hour.

• Data size may have increased beyond the capacity of the cluster

• Issues with network connectivity or hardware failure

• Inefficient code or poorly optimized queries

• Resource contention with other jobs running on the cluster

• Data skew or data imbalance

• Incorrect configuration settings

Flatten a multilevel sorted linked list while maintaining sorted order.

• Iterate through the linked list nodes and maintain a stack to keep track of child nodes.

• Merge the child nodes with the parent node in sorted order.

• Update the pointers to create a single level flattened linked list.

Given an integer, sum its digits until a single-digit number is obtained. Determine the final single-digit integer.

• Iteratively sum the digits of the integer until a single-digit number is obtained

• Output the final single-digit integer for each test case

• Handle multiple test cases efficiently

• Ensure the final value is less than 10

Implement a priority queue using a heap data structure by completing the provided class functions.

• Implement push(), pop(), getMaxElement(), and isEmpty() functions in the given class structure.

• Use a heap data structure to maintain the priority queue.

• Handle different types of queries (push, pop, getMaxElement, isEmpty) as per the given instructions.

• Ensure the functions return the correct values based on the type of query.

• Test the implementation with sample input and output pro...read more

A dataframe is a two-dimensional tabular data structure in which data is organized in rows and columns. It differs from a dataset in terms of structure and functionality.

• A dataframe is a data structure in which data is organized in a tabular format with rows and columns.

• It is commonly used in data analysis and manipulation tasks.

• Dataframes can handle both structured and semi-structured data.

• They provide a convenient way to store and manipulate large datasets.

• Dataframes offer ...read more

Design a system for users to subscribe to topics and receive notifications for new messages.

• Create a user profile where they can select topics of interest to subscribe to.

• Implement a messaging system that sends notifications to users when new messages are posted related to their subscribed topics.

• Allow users to manage their subscriptions and preferences easily.

• Utilize a database to store user subscriptions and messages for efficient retrieval.

• Consider implementing push notifi...read more

Creating a Spring Boot application for web and database operations

• Create a new Spring Boot project using Spring Initializr

• Add necessary dependencies for web and database operations in pom.xml

• Create a database schema and configure database connection in application.properties

• Create entity classes and corresponding repositories

• Create REST controllers for web operations

• Test the application using Postman or any other REST client

Answering questions related to VLAN, VTP, STP, OSPF, IP classes and range, subnetting, NAT, Cisco routers, and F5 load balancer.

• VLAN is a virtual LAN that allows network administrators to group devices together based on their function or team.

• VTP is VLAN Trunking Protocol that manages VLAN configuration consistency across a network.

• Server mode is normally used in switches for VTP.

• STP is Spanning Tree Protocol that prevents network loops by blocking redundant paths.

• OSPF states...read more

Interview questions for Technology Analyst role

• WebAPI is a framework for building HTTP services that can be consumed by a wide range of clients

• Postman is a tool used for testing APIs by sending HTTP requests and receiving responses

• To delete duplicate records in SQL, use the DELETE statement with a subquery that identifies the duplicates

• AJAX is a technique for creating asynchronous web applications that update parts of a page without reloading the entire page

• LINQ is a language...read more

5 Spring boot annotations and their uses

• 1. @SpringBootApplication - used to mark the main class of a Spring Boot application

• 2. @RestController - used to mark a class as a RESTful controller

• 3. @Autowired - used to inject dependencies into a class

• 4. @RequestMapping - used to map HTTP requests to methods in a controller

• 5. @EnableAutoConfiguration - used to enable Spring Boot's auto-configuration feature

To write a REST API for updating and creating a new resource, follow these pointers.

• Define the API endpoint and HTTP method for creating and updating resources

• Validate the input data and handle errors appropriately

• Update or create the resource in the database

• Return a response with the updated or created resource and a status code indicating success

To find the first 3 highest student records from a class of students.

• Sort the student records in descending order based on their scores.

• Select the top 3 records from the sorted list.

• If there are ties, include all students with the same score in the top 3.

• Consider edge cases such as empty records or less than 3 records.

Authentication verifies identity, authorization verifies access. Spring Boot uses role-based authorization.

• Authentication confirms the user's identity, authorization determines what the user can access

• Spring Boot uses role-based authorization, where users are assigned roles and permissions are granted to those roles

• Examples of authorization include file permissions, access control lists, and role-based access control

Designing a database for a parking lot and creating relationships between tables.

• Create a table for parking spots with a unique ID

• Create a table for vehicles with a unique ID

• Create a table for parking transactions with a unique ID, parking spot ID, and vehicle ID

• Establish a one-to-many relationship between parking spots and parking transactions

• Establish a one-to-many relationship between vehicles and parking transactions

Refine graph traversing solution by optimizing algorithms and data structures.

• Use efficient algorithms like Dijkstra's or A* for shortest path traversal.

• Implement data structures like priority queues or heaps for faster traversal.

• Consider using parallel processing or distributed computing for large graphs.

• Optimize memory usage by using compressed data structures like succinct graphs.

• Use caching to avoid redundant computations and improve performance.

Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.

• Abstract class can have constructors, fields, and methods, while interface cannot have any implementation.

• A class can only extend one abstract class, but can implement multiple interfaces.

• Abstract classes are used to define common characteristics of subclasses, while interfaces are used to define a contract for classes to implement.

• Example: Abstract class 'Shape' wit...read more

HSD processes encompass creation, deployment, management, and deletion for efficient data handling.

• Creation: Involves data acquisition and processing, e.g., collecting data from IoT devices.

• Deployment: Involves setting up data infrastructure, e.g., cloud storage solutions like AWS or Azure.

• Management: Involves monitoring and optimizing data usage, e.g., using analytics tools to track performance.

• Deletion: Involves secure data removal processes, e.g., using data wiping softwar...read more

I would prefer Spring Data JPA repository as it provides easy implementation of CRUD operations and supports multiple databases.

• Spring Data JPA provides a simple and efficient way to implement CRUD operations.

• It supports multiple databases such as MySQL, PostgreSQL, Oracle, etc.

• It also provides features like pagination, sorting, and querying.

• Spring Data JPA reduces boilerplate code and increases productivity.

• Example: JpaRepository interface in Spring Data JPA provides default...read more

Binary Search halves the search space in each iteration, leading to a time complexity of O(Log n).

• Binary Search divides the array into two halves and compares the target value with the middle element.

• If the target value is less than the middle element, it searches in the left half; otherwise, it searches in the right half.

• This process continues until the target value is found or the subarray size becomes 0.

• Since each comparison reduces the search space by half, the time compl...read more

Caching all dataframe can slow execution due to memory constraints and increased I/O operations.

• Caching all dataframes can lead to memory constraints as all data is stored in memory.

• Increased I/O operations can also slow down execution as data is constantly being read and written to disk.

• Caching should be used judiciously and only for frequently accessed data.

• Partitioning data can also help in reducing memory constraints and improving performance.

SDLC consists of several phases including planning, analysis, design, implementation, testing, deployment, and maintenance.

• Planning: Defining project goals, scope, and requirements.

• Analysis: Gathering and analyzing user requirements.

• Design: Creating a detailed blueprint of the software solution.

• Implementation: Writing code and developing the software.

• Testing: Conducting various tests to ensure software quality.

• Deployment: Releasing the software for users.

• Maintenance: Providin...read more

HashMap is a collection of key-value pairs, while HashSet is a collection of unique elements.

• HashMap allows duplicate values but keys must be unique

• HashSet does not allow duplicate elements

• HashMap uses key-value pairs for storing data, while HashSet only stores individual elements

• Example: HashMap<String, Integer> map = new HashMap<>(); HashSet<String> set = new HashSet<>();

You can retrieve input values using alternative methods like querySelector or event listeners in JavaScript.

• Use document.querySelector('input[name="inputName"]') to select an input by its name attribute.

• Use event listeners to capture input values dynamically, e.g., inputElement.addEventListener('input', function() { console.log(this.value); });

• Access form elements directly via the form object, e.g., const value = document.forms['formName'].elements['inputName'].value;

Parameters are used to define values in a report, while filters are used to limit the data displayed in a report.

• Parameters are used to make a report more dynamic by allowing users to input values such as dates or names.

• Filters are used to limit the data displayed in a report based on specific criteria such as date range or product type.

• Parameters are set before a report is run, while filters can be applied during or after a report is run.

• Examples of parameters include start ...read more

Creating relationships between tables in JPA using entities

• Use annotations such as @ManyToOne, @OneToMany, @OneToOne, and @ManyToMany to define relationships

• Specify the target entity and the mapping column using @JoinColumn

• Use the mappedBy attribute to specify the inverse side of the relationship

• Example: @ManyToOne(targetEntity = Author.class) @JoinColumn(name = "author_id") private Author author;

• Example: @OneToMany(mappedBy = "author") private List books;