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public void SelectFolders() { toolBarButtonFolders.Pushed = true; toolBarButtonSearch.Pushed = false; menuItemViewFolders.Checked = true; menuItemViewSearch.Checked = false; FireViewFolders(); } public void SelectSearch() { toolBarButtonFolders.Pushed = false; toolBarButtonSearch.Pushed = true; menuItemViewFolders.Checked = false; menuItemViewSearch.Checked = true; FireViewSearch(); } public void ShowAddress(string theAddress) { if (theAddress == null) theAddress = string.Empty; textBoxAddress.Text = theAddress; textBoxAddress.SelectionStart = textBoxAddress.Text.Length; } protected override void Dispose( bool disposing ) { //... } #region Windows Form Designer generated code // ... #endregion #region Event Handlers private void menuItemFileExit_Click(object sender, System.EventArgs e) { Application.Exit(); } private void menuItemViewFolders_Click(object sender, System.EventArgs e) { SelectFolders(); } private void menuItemViewSearch_Click(object sender, System.EventArgs e) { SelectSearch(); }

The OPERATION column in Listing 8-3 indicates that two inserts were made during the time period specified in the query. The UNDO_SQL column shows the exact SQL statement you must run to undo the changes this is information the query fetched for you from the undo segments. In this simple example, there are only two delete statements that you ll have to execute if you wish to undo the inserts displayed by your query. However, transactions usually contain several DML statements, in which case you ll have to apply the undo changes in the sequence that the query returns them to correctly recover the data to its original state.

Consider using the RETENTION GUARANTEE setting for your undo tablespace if you re going to issue an Oracle Flashback Query or an Oracle Flashback Transaction Query to resolve a critical data error. This will ensure that the database preserves the necessary unexpired undo data in all undo segments.

Keep the following points in mind concerning the Flashback Transaction Query feature: Turn on minimal supplemental logging if your operations involve chained rows and special storage structures, such as clustered tables. When querying index-organized tables, an update operation is always shown as a two-step delete/insert operation.

private void menuItemViewIcons_Click(object sender, System.EventArgs e) { menuItemViewIcons.Checked = true; menuItemViewDetails.Checked = false; FireViewIcons(); } private void menuItemViewDetails_Click(object sender, System.EventArgs e) { menuItemViewIcons.Checked = false; menuItemViewDetails.Checked = true; FireViewDetails(); } private void menuItemHelpAbout_Click(object sender, System.EventArgs e) { FormAbout formAbout = new FormAbout(); formAbout.ShowDialog(); } private void toolBar1_ButtonClick(object sender, ToolBarButtonClickEventArgs e) { if (e.Button == toolBarButtonUp) { SelectFolders(); FireUpSelected(); } else if (e.Button == toolBarButtonFolders) { SelectFolders(); } else if (e.Button == toolBarButtonSearch) { SelectSearch(); } } private void buttonGo_Click(object sender, System.EventArgs e) { FireAddressChanged(textBoxAddress.Text); } private void textBoxAddress_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == '\r') { e.Handled = true; // to prevent Windows from beeping FireAddressChanged(textBoxAddress.Text); } } #endregion

If the query involves a dropped table or a dropped user, it returns object numbers and user IDs instead of the object names and usernames.

The Flashback Versions Query feature lets you retrieve the various versions of a row, along with their unique version IDs, row version time stamps, SCNs, and so on It tells you what was in the row and what happened to it The Flashback Transaction Query feature, on the other hand, not only identifies the type of operations performed on each version of a row, but also provides the necessary undo SQL to put the rows back in their original state It tells you how to get back to a previous version of the row You can combine the capabilities of these two features by using them in sequence, to perform auditing and related activities Let s look at an example that shows how you can combine the Flashback Versions Query and the Flashback Transaction Query features to undo undesirable changes to your data.

First, use the Flashback Versions Query feature to identify all the row versions in a certain table that have changed in a certain time period, as shown in Listing 8-4 (which is identical to Listing 8-1) Listing 8-4 Using the Flashback Versions Query to Identify Changed Row Versions SQL> SELECT versions_xid AS XID, versions_startscn AS START_SCN, versions_endscn AS END_SCN, versions_operation AS OPERATION, empname FROM EMPLOYEES VERSIONS BETWEEN SCN MINVALUE AND MAXVALUE AS OF SCN 7920 WHERE emp_id = 222; XID START_SCN ---------------- -------0003002F00038BA9 2266 0004002D0002B366 0864 000400170002B366 0827 SQL> In Listing 8-4, let s say we identified the second row, which indicates a delete operation (D) as the culprit By mistake, one of our users incorrectly deleted the row.