"Enqueue waits cannot cause buffer busy waits,
but the absence of indexes (and you point out
missing FK indexes) can result in excessive
tablescanning, and tablescanning can result
in buffer busy waits.
Jonathan Lewis"
Hi Jonathan,
thanks for answering.
there's something I'd like to know, hope you can
explain it to me:
what does the foreground process exactly do with the
child table when it makes a DML (insert, update,...)
to a parent table that's pointed by a FK not indexed?
Does it make a FTS to make sure the DML is not
invalidating the FK ???
if this is the case, and the child table is pretty
big, wouldn't a simple update (to only one row) in the
parent table takes a lot of time.
TIA
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