I think the line that reads 'scanning the entire table of one million rows' should probably be 'scanning the entire table of twenty thousand odd rows'.

I'm not being pedantic here - I always like it when someone questions something in a doc I've written as it shows they've read it. The only reason I noticed it was such a good article that I was paying proper attention when I read it :).

Thanks for this series, I'm really enjoying it.

I'm meant to be a seasoned DBA, sometimes it worries me how rusty I am on some very fundamental subjects.

Best,

Andy