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All statements that read the table take advantage of this read consistency In the example just shown, the UPDATE reads the table to find rows where x=2 (and then UPDATEs them) The INSERT reads the table to find rows where X=2, and then INSERTs them, and so on It is this dual use of the undo segments, both to roll back failed transactions and to provide for read consistency that results in the ORA-01555 error The third item in the previous list is a more insidious cause of ORA-01555 in that it can happen in a database where there is a single session, and this session is not modifying the tables that are being queried when the ORA-01555 error is raised! This doesn t seem possible why would we need undo data for a table we can guarantee is not being modified We ll find out shortly.

The ApplyEdit() method is also a little complex. It also does some processing beyond that provided by UndoableBase:

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Before we take a look at all three cases with illustrations, I d like to share with you the solutions to the ORA-01555 error, in general: Set the parameter UNDO_RETENTION properly (larger than the amount of time it takes to execute your longest-running transaction) V$UNDOSTATUNDOSTAT can be used to determine the duration of your long-running queries Also, ensure sufficient space on disk has been set aside so the undo segments are allowed to grow to the size they need to be based on the requested UNDO_RETENTION Increase the size of or add more undo segments when using manual undo management This decreases the likelihood of undo data being overwritten during the course of your long-running query This method goes toward solving all three of the previous points Note that this is definitely not the preferred method; automatic undo management is highly recommended Reduce the runtime of your query (tune it).

This is always a good thing if possible, so it might be the first thing you try It reduces the need for larger undo segments This method goes toward solving all three of the previous points Gather statistics on related objects This helps avoid the third point listed earlier Since the block cleanout is the result of a very large mass UPDATE or INSERT, statistics-gathering needs to be done anyway after a mass UPDATE or large load..

Public Sub ApplyEdit() _neverCommitted = False AcceptChanges(Me.EditLevel - 1) BindingEdit = False End Sub Protected Overrides Sub AcceptChangesComplete() If Parent IsNot Nothing Then Parent.ApplyEditChild(Me) End If MyBase.AcceptChangesComplete() End Sub Again, when either CancelEdit() or ApplyEdit() is called, that call ends any data binding edit currently in effect, so the BindingEdit property is set to False. There s also a _neverCommitted flag that is used to track whether the ApplyEdit() method on this object has ever been called. This field is used in the IEditableObject implementation to support the automatic removal of child objects from a list but is used only for Windows Forms 1.0 style data binding (so is nearly obsolete at this point in time). The most interesting bit of code here is in AcceptChangesComplete(), where a Parent. ApplyEditChild() method is called. This occurs if this object is a child of some other object and the ApplyEditChild() method is used to tell the parent object that its child s ApplyEdit() is invoked. The EditableRootListBase class uses this to determine that the user has completed editing a particular child object in the list, so it knows to trigger an immediate save of that child object s data. I discuss EditableRootListBase in more detail in 16. At this point you ve seen the code for the Public methods that support the undo functionality. There are also three similar methods that support data binding through the IEditableObject interface.

We ll come back to these solutions, as they are important to know. It seemed appropriate to display them prominently before we begin.

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