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To retrieve a table using the FLASHBACK TABLE table_name TO BEFORE DROP command, you must either be the owner or have the drop privileges (DROP TABLE or DROP ANY TABLE) on a table. To use the PURGE command, you need similar privileges. You must have the SELECT privilege and the FLASHBACK privilege on an object in order to query that object in the Recycle Bin.

Part of object design includes reviewing things to ensure that the model won t lead to poor performance. This isn t really a single step in the process but rather something you should do on a continual basis during the whole process. However, once you think the object model is complete, you should always pause to review it for performance issues. One primary performance issue with many object models deals with the use of relational thinking when designing the objects. Normalizing data within the object model is perhaps the most common flaw causing performance issues. Because of the design of ProjectResource, ResourceAssignment, and Assignment, the object model has already eliminated this issue by normalizing behavior instead of data. This helps avoid loading entire business objects just to display a couple of common data elements.

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Before Oracle Database 10g, if you suffered logical database corruption, you would undertake traditional point-in-time recovery techniques, restoring data file backup copies and then using archived

redo logs to advance the database forward. This was often time-consuming and cumbersome. No matter how limited the extent of the corruption, you would need to restore entire data files and apply the archived redo logs.

These files look very familiar! They do not contain any interesting information yet, but the scaffolding needed to begin the real work is complete.

Oracle can check data block integrity by computing checksums before writing the data blocks to disk. When the block is subsequently read again, the checksum for the data block is computed again, and if the two checksums differ, there is likely corruption in the data block. By setting the DB_BLOCK_CHECKSUM initialization parameter to FULL, you can make the database perform the check in the database buffer cache itself, thus eliminating the possibility of corruption at the physical disk level. The DB_BLOCK_CHECKSUM parameter is FALSE by default.

In Oracle Database 10g, the Flashback Database feature restores data files but without requiring backup data files and using just a fraction of the archived redo log information. A Flashback Database operation simply reverts all data files of the database to a specified previous point in time. With Flashback Database, the time it takes to recover is directly proportional to the number of changes that you need to undo. Thus, it is the size of the error and not the size of the database that determines the time it takes to recover. This means that you can recover from logical errors in a fraction of the time perhaps as little as a hundredth of the time, depending on the size of the database that it would take using traditional methods.

The EditableRootListBase class supports the creation of dynamic collections. As discussed in 5, these collections are designed specifically to support in-place editing of data in a Windows Forms DataGrid-style interface, where changes to each row of data should be saved immediately as the user moves off that row. This base class exists primarily to support data binding and to abstract the interaction with the editable root objects it contains. It is declared like this: <Serializable()> _ Public MustInherit Class EditableRootListBase(Of T _ As {Core.IEditableBusinessObject, Core.IUndoableObject, Core.ISavable}) Inherits Core.ExtendedBindingList(Of T) Implements Core.IParent Implements Server.IDataPortalTarget End Class Like BusinessListBase, this class inherits from ExtendedBindingList and thus BindingList(Of T). It gains support for data binding in WPF and Windows Forms from BindingList(Of T). You can get an idea of the inheritance hierarchy for this class by looking at Figure 6-8. It also implements numerous interfaces, enabling it to act as a parent object, interact with the data portal, and so forth. s 7 through 14 detail the implementation of the various major subsystems used by EditableRootListBase.

Flashing back a database is possible only when there is no media failure. If you lose a data file or it becomes corrupted, you ll have to recover using a restored data file from backups.

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