Thursday, July 22, 2021

Snowflakes interview questions -2

Questions specific to data loading/unloading :

1. Difference between copy and put command.
2. Steps involved in creation of stages.
3. Different type of stages.
4. Rejected/bad records- how to view them.
5. Considering a scenario where you need to load files as soon as it arrives, how would you implement it.
6. Loading semi structured data - through variant column.
7. How does snowflake always load the incremental data files ignoring the ones already loaded.
8. How would you force to load all the files in a given folder/directory.
9. Can you query data on external storage without loading them, if yes how ?
10. Bulk vs Continuous loading.

Snowflakes interview questions -1

Probable Interview Questions on Snowflake :

Snowflake being relatively new most of the interview questions would be based on how you have implemented and used it in your project.

Some which I could recall are -

1. Snowflake Architecture and it's various components
2. Data loading and challenges faced
3. Data loading include copy command, how do you create stages, various stage - table/internal/external.
4. How does stages differ from each other.
5. How to create external stage referencing S3 bucket/ADSL
6. Scenarios like how do you handle duplicates as integrity constraints are not enforced in SF.
7. What are warehouses and how do you design it.
8. Performance optimization - Auto Scaling, Caching and clustering
9. Scenarios where you have used time travel feature.
10. UDF and how have you used it.
11. Restrictions in SF as compared to RDBMS database.
12. If you have worked on migration what are challenges faced and how did you overcome it.
13. Task, streams implementation scenario.
14. Structured/semi- structured files how have you loaded them.
15. Volume of data you have handled.
16. Architecture of your project.
17. Orchestration of SF pipelines - tools being used for it.
18. How do you handle transactional transactions in Snowflake.
19. Snowpipe
20.Data Unloading.
21. Role based access management - important to have knowledge on this.
22. How does normal views and materials views differ in Snowflake 

There can be various scenario based question based on what you explain about your project and how knowledgeable interviewer  is.

With Snowflake you need to have basic to intermediate knowledge on cloud technology and orchestration will be add on.