Lumos Software Solutions Interview Questions and Answers

Inquiring about salary expectations will likely lead to an offer that does not exceed 30%, with 12% as a variable amount allocated for a performance bonus, which you may never receive, based on the rationale that your experience is not relevant, despite having a background in a related field such as voice processing. Additionally, do not anticipate clear job descriptions, as the company's approach is broad and diplomatic, reflecting a lack of transparency.

Q1. Tell me about yourself.
Ans. 
Experienced voice process executive with strong communication skills and a proven track record of delivering exceptional customer service.
• Over 5 years of experience in handling customer queries and resolving issues efficiently

• Proficient in using CRM software to track customer interactions and maintain records

• Skilled in active listening and problem-solving to ensure customer satisfaction

• Ability to work well under pressu
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Q2. Questions which are not relevant or the process and work criteria they are not aware of from previous job role,and if you have number or percentage in your resume then please remove it that will be ur ene...read more
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Q1. What are SAP tools to migrate SAP systems from on-premise to cloud?
Ans. 
SAP tools for migrating SAP systems from on-premise to cloud include SAP Advanced Data Migration, SAP Cloud Platform Migration Service, and SAP Transformation Navigator.
• SAP Advanced Data Migration: tool for migrating data from on-premise systems to cloud

• SAP Cloud Platform Migration Service: helps in migrating applications and workloads to the cloud

• SAP Transformation Navigator: tool for planning and executing system mig
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Q2. When you use export/import method form migration, what files will be created during export?
Ans. 
During export using export/import method for migration, files like data files, control files, and log files will be created.
• Data files containing the actual data being exported

• Control files containing information about the export process

• Log files recording the activities and errors during the export

• Examples: .dmp, .ctl, .log files
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Q3. How does parallel export/import work ?
Ans. 
Parallel export/import allows multiple processes to export/import data simultaneously for faster migration/conversion.
• Parallel export/import splits the data into multiple parts and processes them concurrently.

• It helps in reducing the overall time taken for data migration/conversion.

• Parallel export/import requires careful planning to avoid conflicts and ensure data consistency.

• Examples include using SAP tools like R3loa...read more
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Q4. If you are using DMO to migrate a SAP system with sql DB on windows to HANA DB on linux, how the SUM will run? As there is a different SUM for windows and linux, will it use 2 different SUM in this case?
Ans. 
SUM will use a single SUM tool for the migration from SQL DB on Windows to HANA DB on Linux.
• SUM tool is platform-independent and can be used for migrations between different operating systems.

• The SUM tool will handle the conversion process seamlessly without the need for separate tools for Windows and Linux.

• The migration process will involve steps to convert the database from SQL to HANA while also transitioning the op
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Q5. Can EHP 5 run on oracle 19C ?
Ans. 
No, EHP 5 cannot run on Oracle 19C.
• EHP 5 is not certified to run on Oracle 19C.

• Compatibility issues may arise if trying to run EHP 5 on Oracle 19C.

• It is recommended to check SAP's official compatibility matrix for supported configurations.
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Q6. What are technical differences in SPDD and SPAU?
Ans. 
SPDD is for modifying dictionary objects, SPAU is for modifying repository objects.
• SPDD is used for modifying dictionary objects like tables, views, and data elements.

• SPAU is used for modifying repository objects like programs, function modules, and screens.

• SPDD changes are transportable across systems, SPAU changes are not transportable.

• SPDD changes are typically related to data dictionary objects, SPAU changes are re...read more
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Q7. Can we skip SPDD in preprocessing? If yes, what will happen? If no, what stops us from skipping it?
Ans. 
Skipping SPDD in preprocessing is not recommended as it can lead to inconsistencies in the system.
• No, SPDD should not be skipped in preprocessing as it is a crucial step in handling modifications to the ABAP Dictionary objects during an upgrade or migration.

• Skipping SPDD can result in inconsistencies between the data dictionary and the ABAP programs, leading to runtime errors and system issues.

• SPDD is responsible for a...read more
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Q8. Why is SPDD need to be performed before execution phase and SPAU after execution?
Ans. 
SPDD is performed before execution phase to adjust dictionary objects, while SPAU is performed after execution to adjust repository objects.
• SPDD is performed before execution phase to adjust dictionary objects to the new release of SAP system.

• SPAU is performed after execution to adjust repository objects like programs, function modules, screens, etc.

• SPDD helps in adjusting the data dictionary objects to the new release...read more
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Q9. Can we perform SPAU before execution?
Ans. 
Yes, SPAU can be performed before execution.
• SPAU can be performed to adjust modifications before executing a system upgrade or migration.

• It allows for resolving any inconsistencies in custom objects before the actual upgrade.

• Performing SPAU beforehand can help streamline the upgrade process and reduce downtime.

• It is recommended to review and adjust modifications using SPAU prior to the upgrade to ensure a smooth transi
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Q10. Which process of SWPM will be used for export/import?
Ans. 
The export/import process in SWPM is performed using the R3load tool.
• R3load tool is used for exporting and importing data during system migrations/conversions.

• Export/import process involves extracting data from source system and loading it into target system.

• R3load tool is part of Software Provisioning Manager (SWPM) toolset.

• Export/import process is crucial for transferring SAP system data between systems.
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Q11. What processes will be used for shipping the files in case of parallel export/import?
Ans. 
Files can be shipped in parallel export/import using tools like Rsync, SCP, FTP, or cloud storage services.
• Use tools like Rsync for efficient file transfer

• SCP (Secure Copy Protocol) can be used for secure file transfer

• FTP (File Transfer Protocol) is another option for transferring files

• Utilize cloud storage services like AWS S3 or Google Cloud Storage for large file transfers
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Q12. Can we restore backup of HANA 1.0 on HANA 2.0 ?
Ans. 
No, backup of HANA 1.0 cannot be restored on HANA 2.0 due to compatibility issues.
• Backup of HANA 1.0 is not compatible with HANA 2.0 due to differences in architecture and features.

• Data structures and formats may have changed between the two versions, leading to potential data corruption if restored.

• It is recommended to perform a system copy or migration instead of trying to restore a backup from HANA 1.0 to HANA 2.0.
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Q13. Why do we need shadow instance?
Ans. 
Shadow instances are used for testing and validation purposes before making changes to the production system.
• Shadow instances allow for testing system changes without impacting the production environment.

• They are used to validate migration or conversion processes before applying them to the live system.

• Helps in identifying any potential issues or errors that may arise during the actual migration/conversion.

• Provides a s...read more
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Q14. How is shadow instance created and where is it created? How much extra space it will require and what tables will it be stored in?
Ans. 
Shadow instance is created for system copy or migration, requires extra space, stored in database tables.
• Shadow instance is created using software tools like SAP SWPM (Software Provisioning Manager) during system copy or migration.

• It is created on the same server as the original instance, but with a different SID (System ID).

• Extra space required for shadow instance depends on the size of the original instance and the d...read more
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Q15. In case of oracle, it creates an additional tablespace during upgrade. How does it work in SAP HANA and Sybase?
Ans. 
SAP HANA and Sybase do not create additional tablespaces during upgrade like Oracle.
• SAP HANA and Sybase do not follow the same approach as Oracle in creating additional tablespaces during upgrade.

• In SAP HANA, data is stored in memory and does not require separate tablespaces like Oracle.

• Sybase also does not create additional tablespaces during upgrade, as it follows a different database structure.

• Both SAP HANA and Syba...read more
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Q16. Is it possible to upgrade without creating Shadow instance?
Ans. 
Yes, it is possible to upgrade without creating a Shadow instance.
• Upgrade can be performed directly on the existing instance without the need for a Shadow instance.

• This approach may save time and resources by avoiding the creation of a separate instance for the upgrade process.

• However, it is important to carefully plan and execute the upgrade to minimize risks and ensure a successful outcome.
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Q17. What is HANA Topology?
Ans. 
HANA Topology refers to the layout and configuration of SAP HANA systems and components.
• HANA Topology includes the distribution of HANA instances across multiple hosts.

• It also involves the configuration of high availability and disaster recovery setups.

• Different HANA Topologies include single host, multi-host, scale-out, and distributed systems.

• Topology decisions impact performance, scalability, and availability of the
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Q18. How to setup SSO for SAP and HANA ?
Ans. 
Setting up SSO for SAP and HANA involves configuring trust between systems and enabling authentication mechanisms.
• Configure trust between SAP and HANA systems

• Enable SAML (Security Assertion Markup Language) for authentication

• Implement Single Sign-On (SSO) using SAML tokens

• Use SAP Cloud Identity or other identity providers for SSO setup
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Q19. As I do not have experience in OS/DB migration, any conceptual knowledge of heterogeneous migration ?
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Q20. Conceptual knowledge of SAP S/4HANA conversion?
Ans. 
SAP S/4HANA conversion involves migrating from SAP ERP to the next-generation S/4HANA platform.
• Understanding the differences between SAP ERP and S/4HANA

• Assessing system landscape and data readiness for conversion

• Executing the migration process with minimal downtime

• Validating and testing the converted system for functionality and performance

• Training end-users on the new S/4HANA system
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Q21. Basics of SAP BTP.
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Q1. Core java based questions, followed by springboot and then sql queries
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Q1. Scenario based java and spring boot questions and more complex sql queries
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Q1. Previous project related questions like difficulty faced in project, how you overcome that, day to day routine, discussed role in projects
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Q1. Salary discussion and onboarding instructions
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Basic Python, SQL, and Bash questions

Q1. SQL questions with operations that include changing from string to array. Tip: stick to RDBMS-specific dialects only (like Postgres), I used Spark SQL
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Q2. Simple Python questions with a follow-up to optimise it
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Q3. Bash script-based questions, are pretty basic.
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Q4. Data pipeline design and best practices.
Ans. 
Data pipeline design involves creating a system to efficiently collect, process, and analyze data.
• Understand the data sources and requirements before designing the pipeline.

• Use tools like Apache Kafka, Apache NiFi, or AWS Glue for data ingestion and processing.

• Implement data validation and error handling mechanisms to ensure data quality.

• Consider scalability and performance optimization while designing the pipeline.

• Doc...read more
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Q1. Easy to medium Leetcode-based question. With moderate difficulty.
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Q2. Simple Python-based question with optimisation.
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Q3. Design specific questions based on Data pipelines.
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Q1. SQL-based question with moderate difficulty.
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Q2. Python-based questions, follow questions with some optimisations.
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Q3. Bash-script based round.
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Arrays and strings - 90 mins

Create Modules, railway reservation system - 60 mins

Q1. Difference between hashmap and hasptable
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Q2. Why typescript over javascript
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Q3. Find the percentage of increace in the quantity of item after making it price 20% extra
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Q4. What is normalization
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Q5. Date and time api available
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Q1. Internal working of hashmap
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values based on keys.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• To retrieve a value, the key is hash...read more
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Q2. Find Anagram from string array
Ans. 
Find anagrams from a string array
• Iterate through each string in the array

• Sort the characters of each string to create a key for comparison

• Use a hashmap to group anagrams together

• Return the grouped anagrams as arrays
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Q1. Top view of binary Tree
Ans. 
A top view of a binary tree shows the nodes visible when looking at the tree from the top.
• The top view of a binary tree is the set of nodes visible when looking at the tree from the top.

• Nodes at the same horizontal distance from the root are considered at the same level.

• Use a map to store the horizontal distance of each node and only keep the first node encountered at each horizontal distance.
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Q2. Java based questions
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Q1. Hight of binary tree
Ans. 
Height of a binary tree is the maximum number of edges on the longest path from the root node to a leaf node.
• Height of an empty tree is -1

• Height of a tree with only one node is 0

• Height of a binary tree can be calculated recursively by finding the height of left and right subtrees and adding 1 to the maximum of the two heights
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Q2. Garbage Collector
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Q1. Library Management System
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