What is incremental data extraction?

Parthiban Kannan

Updated on February 6, 2026

< 1 min read

Incremental data extraction means we only pull the data that changed since the last load, not the full table.
In my project, we used it while loading daily sales data from the application DB to the reporting warehouse.
We tracked a last_updated_timestamp column to identify new and modified records.
The ETL job stored the last successful run time in a control table.
Next run, it extracted records where timestamp > last_run_time.
This reduced load time from 40 minutes to about 5 minutes.
It also avoided duplicate data in reports and improved dashboard freshness.
If a job failed, we reran from the last checkpoint instead of reloading everything.
It’s especially useful for large transactional tables like orders or payments.