OPTIMZE ZOrder does not have an effect

Luu
Databricks Partner

Hi all,

recently I am facing a strange behaviour after an OPTIMZE ZOrder command. For a large table around (400 mio. rows) I executed the OPTIMIZE command with ZOrder for 3 columns. However, it seems that the command does not have any effect and the command does not do anything. Looking into the table history, I also can not find a new OPTIMIZE operation. In the history I can see, that the table was OPTIMIZED without ZOrder a couple of months ago. But I would expect that the OPTIMIZED with ZOrder would have triggered some file optimization. Do you have any idea? Do I overlook something?

Thanks in advance.