NTT Data ETL Developer Interview Questions and Answers

Q1. Rank and dense rank
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Q2. Scenario based etl question
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Q1. Basic Question Answer
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Q2. Basic SQL , SNWOFLAKE AND ETL Concepts
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Q1. Informatica powercenter architecture, scd1, scd2 etc
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Q2. Lookups and where to use them
Ans. 
Lookups are used to retrieve related data from another table based on a common key.
• Lookups are used in ETL processes to enrich data by adding additional information from a reference table.

• They are commonly used to replace codes with corresponding descriptions, such as replacing product IDs with product names.

• Lookups can be performed using SQL joins or lookup transformations in ETL tools like Informatica or Talend.
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Q1. Some in depth questions about python and java
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Asked some problem solving questions they will allow to choose the language it's good

Q1. What is the uses of filter stage
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Filter stage is used in ETL processes to selectively pass or reject data based on specified criteria.
• Filter stage helps in removing unwanted data from the input dataset.

• It can be used to apply conditions like filtering out duplicate records, selecting specific columns, or excluding certain values.

• For example, a filter stage can be used to only pass records where the sales amount is greater than $1000.
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Q2. What is the uses of transfor stage
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Transform stage is used in ETL process to apply business rules, clean and enrich data before loading into target database.
• Transform stage is used to apply business rules to the data.

• It is used to clean and standardize data before loading into the target database.

• Transform stage can also be used to enrich data by combining multiple sources or adding calculated fields.

• Examples include converting data types, removing dupl
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Q3. What is the uses of sort stage
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Sort stage is used in ETL processes to sort data based on specified criteria before loading it into the target system.
• Sort stage helps in arranging data in a specific order for better analysis and reporting

• It can be used to remove duplicates from data before loading

• Sorting can be done based on multiple columns or expressions

• Example: Sorting customer data based on their purchase amount before loading into a data warehou
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Q4. How to create the prallel job
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To create a parallel job, use parallel processing techniques to divide tasks into smaller subtasks that can be executed simultaneously.
• Identify tasks that can be executed independently and in parallel

• Use parallel processing techniques such as multi-threading or distributed computing

• Implement parallel job using ETL tools like Informatica or Talend

• Monitor and optimize parallel job performance to ensure efficient executio
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Q5. Defenation of scd
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SCD stands for Slowly Changing Dimension, a technique used in data warehousing to track changes in dimension attributes over time.
• SCD is used to maintain historical data in a data warehouse

• There are different types of SCDs - Type 1, Type 2, and Type 3

• Type 1 SCD overwrites old data with new data

• Type 2 SCD creates a new record for each change and maintains history

• Type 3 SCD keeps a limited history by adding columns to tr
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Q1. Question on logic SCD types
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Q2. Dynamic lookup along with lookup
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Q1. What is inital load in ETL
Ans. 
Initial load in ETL refers to the process of loading data from source systems into the data warehouse for the first time.
• Initial load is typically a one-time process to populate the data warehouse with historical data.

• It involves extracting data from source systems, transforming it as needed, and loading it into the data warehouse.

• Initial load is often done using bulk loading techniques to efficiently transfer large vo...read more
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Q2. What is difference between cluster and non cluster index
Ans. 
Cluster index physically orders the data on disk, while non-cluster index does not.
• Cluster index physically orders the data on disk based on the indexed column

• Non-cluster index does not physically order the data on disk

• Cluster index can only have one per table, while non-cluster index can have multiple

• Cluster index is faster for retrieval but slower for inserts and updates
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