> > > The cost is "13.88" to fetch 1 row by scanning an Primary Key > > indexed column. > > > > Isn't the cost for fetching 1 row is too high ? > > I don't know, how many index pages will need to be randomly accessed > in addition to the random heap access? How many dead versions of > the row will need to be visited besides the row which is actually > visible? How many of these pages are in shared_buffers? How many > of these pages are in OS cache? >
Total Index pages are 140310. Yes. I suspect most of the times the required page is found in either OS cache or disk (shared_buffers is .9 GB) as we have 200+ GB of highly active database and the Index is on a 10GB table.
