> Mainly 'cause it doesn't know where the dead tuples are till it's
> looked.

At this point I feel very stupid...

> Also, VACUUM is the data collector for the free space map,
> and so it is also charged with finding out how much free space exists
> on every page.

Ah, now I just feel enlightened!  That makes perfect sense.  I think I had
been conflating free pages with free space, without understanding what the
difference was.  Of course I still don't really understand, but at least I
now _know_ I don't.

Many thanks


---------------------------(end of broadcast)---------------------------
TIP 2: you can get off all lists at once with the unregister command
    (send "unregister YourEmailAddressHere" to [EMAIL PROTECTED])

Reply via email to