Batch, ETL, and ELT
On This Lesson 4 topics
This lesson is planned. The outline below lists the topics it will cover. The full lesson has not been published yet.
In this lesson
know when batch is the right and cheaper choice and how ETL differs from ELT.
Planned topics
- ETL transforms before loading; ELT loads raw data first and transforms inside the target, common with warehouses.
- Batch is simple to test, replay, and reconcile; it fits reports, finance, and bulk master data.
- Design for restarts: batches must be idempotent, with run IDs and row counts checked.
- Pick the window from business need; "real time" costs more and is often not required.
Draft outline details
Demonstration
a timeline of Larkspur's nightly loads (product master 01:00, sales to warehouse 02:00, finance posting 03:00) with row-count checks after each.
Check your understanding
What makes a batch safe to re-run?
Show answer
Idempotence: loading the same input twice leaves the same result.
Practice
Apply this lesson with the module's lab, exercises and quiz.
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