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The error is actually straightforward and has only two real causes, but since there s a special case of one of them that happens so frequently, I ll say that there are three: The undo segments are too small for the work you perform on your system. Your programs fetch across COMMITs (actually a variation on the preceding point). We covered this in the Transactions chapter. Block cleanout.

Remember that the undo methods in UndoableBase throw an exception if the object s edit level gets out of sync with its parent object. The parent s edit level is passed in as a parameter to each undo method, such as CopyState(). When manually invoking CopyState(), it is necessary to pass in a parameter indicating the future state of the edit level. When taking a snapshot, the future edit level is one higher than the current edit level. In other words, this would cause an exception: CopyState(Me.EditLevel) The reason is that CopyState() would see that it is about to raise the object s edit level above the value passed in as a parameter, so it would throw an exception. By passing in EditLevel + 1, the BeginEdit() method is effectively giving permission for the object to take a snapshot of its state.

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The first two points are directly related to Oracle s read-consistency model. As you recall from 7 Concurrency and Multi-versioning, the results of your query are pre-ordained, meaning they are well-defined before Oracle goes to retrieve even the first row. Oracle provides this consistent point in time snapshot of the database by using the undo segments to roll back blocks that have changed since your query began. Every statement you execute, such as the following: update insert delete select t set x = 5 where x = 2; into t select * from t where x = 2; from t where x = 2; * from t where x = 2;

Paying bills on time could have been very tricky in those days! Sam wondered how modern-day network administrators would have handled NTP synchronization during such times It s better that some avoided the experience even as they well understood that all were role-playing during different planetary energy states The memory of a role during which they were asked to fight a lion with their bare hands in a Roman arena for the sin of inaccurate NTP synchronization could have prevented those actors from taking on the net admin roles in modern times! Even as the idea of a leap year is very appealing, it is not without its faults The energy states of the solar system that incorporate the spatial relationship between the earth and the sun have defied earthly scientists and astronomers throughout human history to identify them with absolute precision.

will see a read-consistent view of T and the set of rows where X=2, regardless of any other concurrent activity in the database.

The CancelEdit() method is a little more complex. Actually, it isn t CancelEdit() that s more complex but the required post-processing implemented in an override of UndoChangesComplete() that is complex: Public Sub CancelEdit() UndoChanges(Me.EditLevel - 1) End Sub Protected Overrides Sub UndoChangesComplete() BindingEdit = False ValidationRules.SetTarget(Me) InitializeBusinessRules() OnUnknownPropertyChanged() MyBase.UndoChangesComplete() End Sub Like BeginEdit(), the CancelEdit() method lets UndoableBase do the hard work. But when the UndoChanges() method is complete, there is some housekeeping that must be done by BusinessBase, and that is handled by the UndoChangesComplete() override. 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. If data binding calls BeginEdit() through IEditableObject, BindingEdit will be set to True again, but any cancel or accept operation ends that edit process. An UndoChanges() operation effectively deserializes some data that is stored in the Stack object, as discussed earlier in the chapter. This means it is necessary to ensure that all the internal references between objects are correct. For example, the ValidationRules.SetTarget() method ensures that this object s ValidationRules object has the correct reference as the target for all business rules. It is also the case that an undo operation probably changed one or more property values. Most likely, the user has changed some property values and the undo reset them to some previous values. The call to OnUnknownPropertyChanged() raises a PropertyChanged event so data binding knows that the UI needs to be refreshed to reflect the changes.

Note The four statements presented here are just examples of the types of statements that would see a readconsistent view of T. They are not meant to be run as a single transaction in the database, as the first update would cause the following three statements to see no records. They are purely illustrative.

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