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Figure 10-5 Migrated row depiction So, a migrated row is a row that had to move from the block it was inserted into onto some other block Why is this an issue Your application will never know; the SQL you use is no different It only matters for performance reasons If you go to read this row via an index, the index will point to the original block That block will point to the new block Instead of doing the two or so I/Os to read the index plus one I/O to read the table, you ll need to do yet one more I/O to get to the actual row data In isolation, this is no big deal you won t even notice it However, when you have a sizable percentage of your rows in this state, with many users accessing them, you ll begin to notice this side effect.

The AcceptChanges() method isn t nearly as complicated as UndoChanges(). It also decrements the _editLevel field to counter one call to CopyState(). The method then cascades the AcceptChanges() call to each child object so that each child object can accept its own changes. The only complex bit of code is that the edit level added value of each child must also be altered: Private Sub AcceptChanges(ByVal parentEditLevel As Integer, _ ByVal parentBindingEdit As Boolean) Implements Core.IUndoableObject.AcceptChanges If Not parentBindingEdit Then AcceptChanges(parentEditLevel) End If End Sub Private Sub AcceptChanges(ByVal parentEditLevel As Integer) If Me.EditLevel - 1 < parentEditLevel Then Throw New Core.UndoException(String.Format( _ My.Resources.EditLevelMismatchException, "AcceptChanges")) End If ' we are coming up one edit level _editLevel -= 1 If _editLevel < 0 Then _editLevel = 0 End If ' cascade the call to all child objects

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Access to this data will start to slow down (additional I/Os and the associated latching that goes with the I/O add to the access time), your buffer cache efficiency goes down (you need to buffer two blocks instead of just the one you would if the rows were not migrated), and your table grows in size and complexity For these reasons, you generally do not want migrated rows (but do not lose sleep if a couple hundred/thousand rows in a table of thousands or more rows are migrated!) It is interesting to note what Oracle will do if the row that was migrated from the block on the left to the block on the right in Figure 10-5 has to migrate again at some future point in time.

This would be due to other rows being added to the block it was migrated to and then updating this row to make it even larger Oracle will actually migrate the row back to the original block and, if there is sufficient space, leave it there (the row might become unmigrated) If there isn t sufficient space, Oracle will migrate the row to another block altogether and change the forwarding address on the original block As such, row migrations will always involve one level of indirection So, now we are back to PCTFREE and what it is used for: it is the setting that will help you to minimize row migration and row chaining (discussed later) when set properly..

For Each child As C In Me childAcceptChanges(_editLevel, False) ' if item is below its point of addition, lower point of addition If childEditLevelAdded > _editLevel Then childEditLevelAdded = _editLevel End If Next ' cascade the call to all deleted child objects For index As Integer = DeletedListCount - 1 To 0 Step -1 Dim child As C = DeletedList(index) childAcceptChanges(_editLevel, False) ' if item is below its point of addition, remove If childEditLevelAdded > _editLevel Then DeletedListRemoveAt(index) End If Next End Sub While looping through the collection and DeleteList, the code makes sure that no child object maintains an EditLevelAdded value that s higher than the collection s new edit level Think back to the LineItem example, and suppose the collection is at edit level 1 and the changes are accepted.

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