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Adding Columns and Exadata HCC compression

Thanks to Jason Arneil for this story

While everyone is aware of the issues of mixing EHCC compression and OLTP type activities, I had a customer who was interested in finding out what happens upon adding a column to a table that has EHCC compression enabled on it.

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As I could not see any definitive statements in the documentation on this particular scenario I ran up some tests to see the behaviour.

First of all they are using partitioning by date range, so we create a partitioned table:

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