LTIMindtree Data Architect Interview Questions and Answers

Window function coding test involves using window functions in SQL to perform calculations within a specified window of rows.

• Understand the syntax and usage of window functions in SQL

• Use window functions like ROW_NUMBER(), RANK(), DENSE_RANK(), etc. to perform calculations

• Specify the window frame using PARTITION BY and ORDER BY clauses

• Practice writing queries with window functions to get comfortable with their usage

Azure Data Factory is a cloud-based data integration service that allows you to create, schedule, and manage data pipelines.

• Azure Data Factory is used to move and transform data from various sources to destinations.

• It supports data integration processes like ETL (Extract, Transform, Load) and ELT (Extract, Load, Transform).

• You can create data pipelines using a visual interface in Azure Data Factory.

• It can connect to on...read more

Data Vault is a modeling methodology for designing highly scalable and flexible data warehouses.

• Data Vault focuses on long-term historical data storage

• It consists of three main components: Hubs, Links, and Satellites

• Hubs represent business entities, Links represent relationships between entities, and Satellites store attributes of entities

• Data Vault allows for easy scalability and adaptability to changing business requ...read more

Lambda architecture is a data processing architecture designed to handle massive quantities of data by using both batch and stream processing methods.

• Combines batch processing layer, speed layer, and serving layer

• Batch layer processes historical data in large batches

• Speed layer processes real-time data

• Serving layer merges results from batch and speed layers for querying

• Example: Apache Hadoop for batch processing, Apach...read more

Yes, I have onsite exposure in previous roles.

• I have worked onsite at various client locations to gather requirements and implement solutions.

• I have experience collaborating with cross-functional teams in person.

• I have conducted onsite training sessions for end users on data architecture best practices.

• I have participated in onsite data migration projects.

• I have worked onsite to troubleshoot and resolve data-related is...read more

The 7 layers in Azure Data Factory for pipelining data from on-premises to Azure Cloud

• 1. Ingestion Layer: Collects data from various sources such as on-premises databases, cloud storage, or IoT devices.

• 2. Storage Layer: Stores the ingested data in a data lake or data warehouse for processing.

• 3. Batch Layer: Processes data in batches using technologies like Azure Databricks or HDInsight.

• 4. Stream Layer: Processes real-t...read more

To convert a normal file to a flat file in Python, you can read the file line by line and write the data to a new file with a delimiter.

• Open the normal file in read mode

• Read the file line by line

• Split the data based on the delimiter (if applicable)

• Write the data to a new file with a delimiter