Testing / Apache JMeter Interview questions
What is the CSV Data Set Config element?
CSV Data Set Config reads data from an external CSV file and makes each row's values available as variables that samplers can reference, letting a test use different data - usernames, product IDs, search terms - across different iterations and threads instead of hardcoding one fixed value.
It's configured with the CSV file's path, which variable names map to which columns, and how threads should share the file - each thread getting its own row in sequence, all threads sharing one row cursor, or each thread recycling through the file independently.
This is the standard way to parameterize a JMeter test so that, for example, a thousand virtual users each log in with a different, realistic username instead of every single one hitting the system with identical credentials.
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