That's On 2003.07.29 19:59, Diego Cutrone wrote:
Another thing I think (I'm sorry to disagree with
Mladen on this) is that when DBWR hasn't finished
writing a buffer to the disk, and a session wants that
buffer in exclusive mode, there's a wait and that wait
is computed as a write complete wait and not as BBW.
DBWR works in 2 phases:
a) It scans for dirty buffers and pins them.
b) It starts IO, usually using writev.
If IO has been launched and not yet finished, then the wait is
"write complete wait". If IO hasn't been started yet, we have "buffer busy".
This "write complete" wait became essential with the advent of
asynchronous I/O. I was just simplifying things, nothing else.
--
Mladen Gogala
Oracle DBA
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Author: Mladen Gogala
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