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Extract, transform, load
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=== In online transaction processing === [[File:Conventional ETL Diagram.jpg|alt=ETL diagram in the context of online transaction processing|thumb|ETL diagram in the context of [[online transaction processing]]<ref name="Kimball 2004" />]] In [[online transaction processing]] (OLTP) applications, changes from individual OLTP instances are detected and logged into a snapshot, or batch, of updates. An ETL instance can be used to periodically collect all of these batches, transform them into a common format, and load them into a data lake or warehouse.<ref name="Kimball 2004" />
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