It states in one of Oracle's own teaching manuals, that if
physical block reads is a lot higher than physical reads, that
it's an indication that Oracle is doing a lot of FTS.
I guess this is because for every read, lots of physical blocks are
in one swoop. Is this accurate?
If so, what sort of factors are involved in this ratio - would it be
MULTIBLOCK_IO_COUNT (not sure of exact spelling) only? Or
are there other factors that can affect it?