How does the ETL pipeline work in large-scale data mining systems?

ETL extracts, transforms, and loads data into analytical systems for mining.

ETL pipelines are the backbone of data mining infrastructure. Extraction collects data from heterogeneous sources like databases, logs, APIs, and streams. Transformation includes cleaning, normalization, aggregation, feature engineering, and schema alignment. Loading stores processed data into data warehouses or data lakes. Modern systems often use ELT (load first, transform later) with distributed systems like Spark.