敗家貓

小記一下
from metalink not<286363.1>

When a truncate/drop is issued,

1.the foreground first acquires the "RO" enqueue in exclusive mode,
2.then cross instance calls (or one call if it is a single object) are issued
(the "CI" enqueue is acquired for cross instance call)
3.The CKPT processes on each of instances requests the DBWR to write
the dirty buffers to the disk and invalidate all the clean buffers.
4. After DBWR finishes writing, the foreground process releases the RO
enqueue.


來源:
http://www.itpub.net/viewthread.php?tid=921802&extra=&page=2