> Would there be any value in incrementing by 2 for index accesses and 1 
> for seq-scans/vacuums? Actually, it should probably be a ratio based on 
> random_page_cost shouldn't it?

What happens with very small hot tables that are only a few pages and thus have 
no index defined.

I think it would not be good to treat such data pages as less important than 
index pages.

Andreas

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TIP 9: the planner will ignore your desire to choose an index scan if your
      joining column's datatypes do not match

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