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When you make a change to a table, you should be able to undo or roll back the change if necessary The information needed to undo or roll back changes in transactions, which mostly consists of the prechange table row information, is called undo data (the change vectors), and it is stored in undo records When you issue a ROLLBACK command, Oracle uses these undo records to replace the changed data with the original versions As 8 explains, the undo records are vital during database recovery when all unfinished or uncommitted transactions must be discarded to make the database consistent Oracle strongly recommends the use of the Automatic Undo Management (AUM) feature, where the Oracle server itself will maintain and manage the undo (rollback) segments All you need to do is provide a dedicated undo tablespace and set the initialization parameter UNDO_MANAGEMENT to auto.

PricedItem category = theOptions[0]; TreeNode categoryNode = new TreeNode(category.Name); categoryNode.Tag = category; treeViewOptions.Nodes.Add(categoryNode); for (int i = 1; i < theOptions.Length; i++) { PricedItem option = theOptions[i]; TreeNode node = new TreeNode(option.Name); node.Tag = option; categoryNode.Nodes.Add(node); } } void PopulateOption(TreeNode theNode, PricedItem[] theOptions) { foreach (PricedItem option in theOptions) { TreeNode node = new TreeNode(option.Name); theNode.Nodes.Add(node); } } public void PopulateModels(string[] theModels) { comboBoxModel.Items.Clear(); if (theModels == null) return; if (theModels.Length == 0) return; comboBoxModel.Items.AddRange(theModels); comboBoxModel.SelectedIndex = 0; } private void treeViewOptions_AfterCheck(object sender, System.Windows.Forms.TreeViewEventArgs e) { TreeNode node = e.Node; if (node == null) return; if (IsCategoryNode(node)) { // check or uncheck all the child options foreach (TreeNode childNode in node.Nodes) childNode.Checked = node.Checked; } else // must be an Options node UpdateOptionsCost(); }

Oracle will create the necessary number of undo segments, which are structurally similar to the traditional rollback segments, and it ll size and extend them as necessary It s not uncommon for new undo segments to be created and old ones to be deactivated based on the number of transactions going on in the database 8 provides further information about the AUM feature Because Oracle will do the sizing of the individual undo segments for you, the two decisions you have to make are the size of the undo tablespace and the setting for the UNDO_RETENTION initialization parameter (which determines how long Oracle will try to retain undo records in the undo tablespace).

Remember that your undo tablespace should not only be able to accommodate all the long-running transactions, but also has to be big enough to accommodate any flashback features you may implement in your database Oracle s flashback features let you undo changes to data at various levels Several flashback features, such as Flashback Query, Flashback Versions Query, and Flashback Table, utilize undo data I discuss the undo-related Flashback features in 8 You can use Oracle s Undo Advisor through the OEM to figure out the ideal size for your undo tablespaces and the ideal duration to specify for the UNDO_RETENTION parameter Using the current undo space consumption statistics, you can estimate future undo generation rates for the instance..

If you wish to access an Oracle database from a PC, you must first install the Oracle Client software on the PC. The Oracle Client software comes with the Oracle Server software, and you can also download the Oracle Client software from the OTN site (http://technet.oracle.com). The Oracle Client software is available for download separately. Although the Oracle Server and Oracle Client software versions need not be the same, Oracle recommends you use matching versions of the types of software so you can take advantage of new features. You can determine your Oracle Client version by looking at the output when you invoke the SQL*Plus utility, as shown here: $ sqlplus C:\>sqlplus SQL*Plus: Release 11.1.0.6.0 - Production on Thu Mar 20 09:27:14 2008 Copyright (c) 1982, 2007, Oracle. Enter user-name: The output of the preceding SQL*Plus command shows that I have Release 11.1.0.6.0 Oracle Client software on my system. All rights reserved.