latch 学习，希望大家支持

philip_123456

up,能整个文档就更好了。

niujiantao9999

，以后逐渐把整个owi的发了

xaojan_199977

不错，一定要顶

zss0109211

mark

microsoft_fly

非常不错

Yong Huang

niujiantao9999,

Thanks for your posting. But it seems most of your writing is a translation of Richmond Shee, Kirtikumar Deshpande, and K. Gopalakrishn's "Oracle wait interface: a practical guide to performance diagnostics & tuning". Always indicate so when you translate others' work, even though you made a great effort in the translation and so made the excellent book easily accessible to Chinese readers.

> The willing-to-wait mode is used only on the last latch when all no-wait requests against other child latches have failed.

That's a sentence you took out of the book (on p.145) without explanation. Some latches can be taken in both modes. These latches have children (not solitary). First, the Oracle process tries to get it (get a child latch) in no-wait mode. If it fails, it tries again to get the second child. If it continues to fail and it comes to the last child, the attemp is in willing-to-wait mode. That's what the quoted sentence means. Search for it at books.google.com to see the whole paragraph. or click this link:

http://books.google.com/books?id ... led.%22&f=false

Yong Huang

niujiantao9999

这个并不是一个纯粹的翻译的；
这是在学习oracle的一个笔记，是摘录了自己感觉有价值的主要部分，以备以后查看；笔记的来源的确是owi的（包括enqueue）；
自己学习oracle的时候发现关于latch 详细阐述 方面的文章比较少，而latch对于优化oracle是非常重要的；
所以就把一点个人的总结发给大家看看；

xin1shou3

支持，
不过建议楼主发一个PDF格式的。

谢谢！

F3678615

非常好

青禾华丽

路过，支持下~