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Updating compressed rows [message #631396] Tue, 13 January 2015 08:22
Roachcoach
Messages: 1513
Registered: May 2010
Location: UK
Senior Member
Hi Smile

I found a damned useful entry on the impact of updating compressed data (having recently been burned by it) that I think is relatively little known so without further ado...

https://blogs.oracle.com/DBStorage/entry/updates_in_row_compressed_tables


The "tl;dr" is a bulk update of a compressed table will highly likely result in significant row chaining and space increases.
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