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3M Data Quality Analyst Interview Questions and Answers
3M Data Quality Analyst Interview Experiences
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Anonymous
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I applied via Naukri.com and was interviewed in Feb 2023. There were 4 interview rounds.
(1 Question)
- Q1. About work experience
(1 Question)
- Q1. About work experience
(1 Question)
- Q1. About work experience
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Selected
(2 Questions)
- Q1. What metrics can be used to evaluate the performance of a regression model?
- Ans.
Various metrics like Mean Squared Error, R-squared, Mean Absolute Error can be used to evaluate regression model performance.
Mean Squared Error (MSE) - measures the average of the squares of the errors or deviations
R-squared (R2) - indicates the proportion of the variance in the dependent variable that is predictable from the independent variables
Mean Absolute Error (MAE) - measures the average of the absolute errors b...
- Q2. What methods can be used to remove a specific type of noise from an image?
- Ans.
Methods like median filtering, Gaussian filtering, and wavelet denoising can be used to remove noise from an image.
Median filtering replaces each pixel's value with the median value of its neighborhood.
Gaussian filtering uses a weighted average of neighboring pixels to smooth out noise.
Wavelet denoising decomposes the image into different frequency bands and removes noise from each band separately.
Machine learning-based problem.
Selected
I applied via Job Portal and was interviewed in Jul 2024. There were 2 interview rounds.
Easy with some MAT questions and behavioural questions
(2 Questions)
- Q1. How do you handle pressure
- Q2. Oops programming
I applied via Naukri.com and was interviewed in Jul 2024. There was 1 interview round.
(2 Questions)
- Q1. Data modelling And Data Warehousing concepts.
- Q2. Day to day challenge and work.
I applied via Naukri.com and was interviewed in Nov 2023. There were 4 interview rounds.
(4 Questions)
- Q1. PERVIOUS EXPERIENCE AND PROJECT RELATED
- Q2. STRENGTH AND WEAKNESS
- Q3. WHY YOU APPLIED FOR THIS JOB
- Q4. WHAT ARE THE KEY INSIGHTS IN YOUR PROJECT
VISUALIZATION CASE STUDY
(1 Question)
- Q1. RELATED TO TECHINCAL SKILLS - TABLEAU ,ALLTERYX
(1 Question)
- Q1. Tel me about yourself
Interview Preparation Tips
Selected
I applied via Recruitment Consulltant and was interviewed in Oct 2023. There were 2 interview rounds.
(3 Questions)
- Q1. Tell me about yourself.
- Q2. Aout Your Degree.
- Q3. Some Reading newspaper for communication
I applied via Approached by Company and was interviewed in Aug 2023. There were 2 interview rounds.
10 class pcm 66%and 12 class Pcm 65%
(8 Questions)
- Q1. Your previous company name
- Q2. What is skill in excel
- Q3. What do system operate and connectivity
- Ans.
System operate and connectivity refer to the functioning and communication capabilities of computer systems.
System operate involves the overall functioning and performance of a computer system.
Connectivity refers to the ability of a system to communicate with other devices or networks.
Examples of connectivity include Wi-Fi, Ethernet, Bluetooth, and USB connections.
System operate includes tasks such as processing data,
- Q4. What with you is system
- Q5. Your preferred annual salary
- Q6. Finaly my selection at the same place
- Q7. Conditionals formatting,formula of excel
- Q8. You know pivot table
- Ans.
Yes, I am familiar with pivot tables and have experience using them in Excel.
Pivot tables are used to summarize and analyze large datasets in Excel.
They allow you to rearrange and summarize data to extract useful information.
You can easily create pivot tables by selecting your data and inserting a pivot table.
You can then drag and drop fields to analyze data in different ways.
For example, you can use a pivot table to a
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Skills evaluated in this interview
I applied via Naukri.com and was interviewed in Sep 2022. There were 3 interview rounds.
(2 Questions)
- Q1. How can you recover the deleted datafiles if datafiles are not taken backup
- Ans.
Recovering deleted datafiles without backup
Check if the datafiles are still in the operating system's recycle bin or trash folder
Use data recovery software to scan the hard drive for deleted files
If the above methods fail, try to recreate the datafiles using the CREATE DATAFILE command
If the tablespace is still intact, use the RMAN RECOVER TABLESPACE command to recover the data
- Q2. How to check dr dc sync
- Ans.
To check DR DC sync, use Data Guard Broker or query V$DATAGUARD_STATS view.
Use Data Guard Broker to check the status of the standby database and its synchronization with the primary database.
Query V$DATAGUARD_STATS view to check the redo apply lag and transport lag between the primary and standby databases.
Check the alert log files of both primary and standby databases for any errors or warnings related to data synchro
(3 Questions)
- Q1. What are er diagrams
- Ans.
ER diagrams are visual representations of entities and their relationships in a database.
ER stands for Entity-Relationship
ER diagrams are used to design and model databases
Entities are represented as rectangles, relationships as diamonds, and attributes as ovals
Examples of entities include customers, orders, and products
Examples of relationships include one-to-one, one-to-many, and many-to-many
- Q2. What is difference between cold backup and hot backup
- Ans.
Cold backup is taken when the database is offline while hot backup is taken when the database is online.
Cold backup is taken when the database is shut down and all files are copied to a backup location.
Hot backup is taken while the database is still running and all files are copied to a backup location.
Cold backup is slower and requires downtime while hot backup is faster and does not require downtime.
Cold backup is mo...
- Q3. How to connect to rman
- Ans.
To connect to RMAN, use the 'rman' command in the command prompt or terminal.
Open the command prompt or terminal
Type 'rman' and press enter
Enter the username and password for the target database
Use the 'connect' command to connect to the target database
Use the 'run' command to execute RMAN commands
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revise before the interview
Interview process was smooth,
interviewer was very supportive and patience guy who wants to listen without ego.
Skills evaluated in this interview
I applied via Approached by Company
(2 Questions)
- Q1. What are your strengths and weaknesses?
- Q2. Tell me about yourself.
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