Re: An idle thought

I was referring in the context of index only scans to skip visibility checks. I doubt, whether the visibility map feature to skip visibility checks at the heap can be created without any extra cost to updates/inserts. When a data is compressed then there is more contention for the same block and hence would likely affect DMLs. I hope that's what Tom was also referring to, but not in the visibility map context.

Gokul.