Oracle Performance Firefighting by Craig Shallahamer Get the book here
Craig Shallahamer's Blog	You were brought to this page based on an internet search and as a free service to Oracle DBAs. 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. ------------------------------- <p>Figure 6-22. Operating system tracing is the reliable way to see how many Oracle blocks the database writer is actually submitting for each request. The far-right column is the number of 8KB Oracle blocks written. The largest multiblock database writer write shown in this figure is 36. p><p>It's the database writer's responsibility to write the dirty buffers to disk. Run this simple query: p><p>You will notice the count cycling up and down. The cycling is the result of the application dirtying buffers while the database writer is writing them to disk, making them free buffers once again. This cycling is normal and what you want to see. If the count keeps going up and up, then you know the database writer is falling behind. It is common to have thousands of dirty buffers in a large production Oracle system. p> ©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.	Know what's important before it's too late! OraPub's Performance Training is like no other... More Class Pics... Get student testimonials!