ETL vs SQL

I’ve recently been asked to explain why I would use an ETL tool such as SSIS over good old fashioned SQL code. Here’s a quick summary, plus some links to others discussing the same topic:

  • Easier to maintain the code – through atomicity and simpler interfaces
  • Many reusable components – a lot of code (e.g. Lookups) has already been constructed
  • More flexible than SPs – they have more functionality (e.g. Cached Lookups, FTP)
  • Can deliver better performance than SPs – use of In Memory techniques can boost performance
  • Features such as logging/audit and metadata are built in
  • Support is more broadly available – it’s easier to find out why a prebuilt, widely used component is throwing errors

I appreciate not everyone will agree, and here’s some people who do, and don’t:

 

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