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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. ------------------------------- * Uba: This is the undo block address. This points directly to the transaction's most recent change undo and is necessary for rolling back a transaction and also for read consistency (cloned buffer construction) purposes. * Flag: The flag is a status of the transaction and can take on many values. The following are the most common: * ---- means the transaction is active; that is, DML is occurring and the transaction has not been committed or rolled back. 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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