Talend Interview Questions and Answers
Experienced / Expert level questions & answers
Ques 1. What is the purpose of the tNormalize component in Talend?
tNormalize is used in Talend to denormalize or normalize data by pivoting or splitting columns based on a delimiter or fixed width.
Example:
You can use tNormalize to handle scenarios where data is stored in a structured but non-relational format.
Ques 2. Explain the significance of the context variables in Talend.
Context variables in Talend are parameters that allow dynamic configuration of Job properties at runtime. They provide flexibility in adapting Jobs to different environments.
Example:
You might use context variables to specify database connection details or file paths, making Jobs more adaptable and reusable.
Ques 3. What is the purpose of the tDenormalize component in Talend?
tDenormalize is used to transform data from a normalized format to a denormalized format by merging rows based on specified keys.
Example:
You can use tDenormalize to handle scenarios where data needs to be flattened for reporting purposes.
Ques 4. What is CDC (Change Data Capture) and how is it implemented in Talend?
CDC is a technique used to identify and capture changes made to data in a database. In Talend, CDC can be implemented using components like tCDCInput to extract only changed data since the last synchronization.
Example:
By using CDC in Talend, you can efficiently update target systems with only the changed data, reducing processing time.
Ques 5. Explain the use of the tNormalize component in Talend.
tNormalize is used to transform data from a denormalized format to a normalized format by splitting columns based on specified keys.
Example:
You can use tNormalize to handle scenarios where data needs to be structured in a normalized form for efficient storage and retrieval.
Ques 6. Explain the role of the tJavaFlex component in Talend.
tJavaFlex allows you to write custom Java code within a Talend Job. It provides flexibility for executing complex logic or implementing custom business rules.
Example:
You can use tJavaFlex to perform advanced calculations or implement custom transformations that are not supported by standard Talend components.
Ques 7. Explain the concept of job design patterns in Talend.
Job design patterns in Talend refer to reusable and recommended approaches for solving common ETL challenges. They help in creating efficient, scalable, and maintainable Jobs.
Example:
An example of a job design pattern is using the 'Slowly Changing Dimension' pattern to handle changes in dimension data over time.
Ques 8. What is the purpose of the tNormalize and tDenormalize components in Talend?
tNormalize is used for transforming data from a denormalized to a normalized format by splitting columns. tDenormalize, on the other hand, is used to transform data from a normalized to a denormalized format by merging rows.
Example:
These components are crucial for handling different data storage and reporting requirements efficiently.
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