|
|
by Craig Shallahamer Get the book here |
|
|
Craig Shallahamer's Blog
The text below is an except from the book, Oracle Performance Firefighting, written by Craig Shallahamer of OraPub, Inc. Figures and tables are not included on this page, only their reference. To order the book in either print or PDF form, click here. ©2009, 2010 by Craig Shallahamer. This is copyrighted material. Please—Out of respect for those involved in the creation of the book and also for their familes, we ask you to respect the copyright both in intent and deed. Thank you. ------------------------------- The percentage of buffer headers in the hot region. If you want more headers to be considered hot, increase this value. Decreasing this parameter will give buffer headers more time to be touched before encountering a server or database writer process. The time window in which a buffer header's touch count (x$bh.tch) can be increased by only one. Increasing this parameter decreases the affect of a sudden buffer-centered activity burst, while risking devaluing truly popular buffers. The touch count threshold a buffer header must meet or exceed to be promoted. If you want to make it more difficult for a buffer to be promoted, increase this value. Then only really hot buffers will remain in the cache. Please—Out of respect for those involved in the creation of the book and also for their familes, we ask you to respect the copyright both in intent and deed. Thank you. |
Know what's important before it's too late!
OraPub's
Performance Training
is like no other...
More Class Pics...
Get student testimonials!