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by Craig Shallahamer Get the book here |
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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. ------------------------------- Figure 6-29. This simple dba_segments-based query clearly shows that block 4,54 is not a header block. Now that we have identified the buffer busy pattern, the object type, and whether the block is a header block, we have enough information to proceed directly to a list of possible solutions. The reason why buffer busy waits events give firefighters so much trouble is that before they can get to an appropriate (and I stress appropriate) solution set, they must first determine the busy pattern, the block's segment type, and if the block is a header block. With this information, we are now ready to jump to a very specific solution set. Solutions for the most common buffer busy situations are presented in the following sections. 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. |
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