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If you use the Database Resource Manager to create consumer groups in your database, which are a convenient way to group your users based on their usage of database resources (see 12), you can easily prevent a single transaction from taking up most of the undo space, thus hindering new transactions from acquiring undo space. You can set a special parameter called UNDO_POOL to limit the maximum undo space a resource consumer group can use. Once this UNDO_POOL limit is reached, any transactions that need more undo room will error out. Only after some of the currently running transactions in the resource consumer group finish can more undo space be granted to that group. The following data dictionary views are useful in managing undo space information: V$UNDOSTAT: This is the view Oracle uses to tune undo space allocation in the database. This view can indicate whether your current allocation of space in the undo tablespace is enough. It also indicates whether you have set the UNDO_RETENTION parameter correctly. The TUNED_UNDORETENTION column in the V$UNDOSTAT view tells you the length of time undo is retained in your undo tablespace. DBA_ROLLBACK_SEGS: You can use this view to find out the undo segment name, initial, next, and maximum extents, and other related information. DBA_TABLESPACES: This view will show whether the guaranteed undo retention feature is enabled for a certain undo tablespace. V$TRANSACTION: You can get transaction information from this view. V$ROLLSTAT: You can join V$ROLLSTAT and V$ROLLNAME to get a lot of information on the behavior of the undo segments. DBA_UNDO_EXTENTS: This view provides detailed information on the undo extents within the undo tablespace.

You can use OEM to help you correctly size your undo tablespace and set the right UNDO_RETENTION parameter value. OEM provides the Undo Advisor to help you determine the space required for your undo tablespace, based on average and peak-level undo generation rates. To get to the Undo Advisor page, go to the OEM Home Page Advisor Central Undo Management and click on the Undo Advisor button. (You can also get to the Undo Advisor by going to the OEM Home Page Performance Page Advisor Central Undo Management and clicking on the Undo Advisor button.) The Undo Advisor shows you the best undo retention possible for a given undo tablespace size. It can also advise you about the correct size for the undo tablespace, based on an undo retention value that you specify, by analyzing the impact of various hypothetical undo retention values. You can also use the Undo Management page (OEM Home Page Administration Instance Undo Management) to perform the following tasks: Change and edit the undo tablespace. View system activity and undo tablespace usage statistics, including the average and maximum undo generation rates and the length (in minutes) of the longest running query. Get recommendations for both undo retention length and undo tablespace size.

Enum LifecycleState StartingUp Running ShuttingDown End Enum Private state As LifecycleState ' Gets a singleton instance of the Builder class. ReadOnly Property Builder() As Builder Get Return Builder.Singleton End Get End Property Public Sub Start() StartupSystem() RunSystem() ' app exits when this call completes End Sub Sub StartupSystem() state = LifecycleState.StartingUp Builder._startup.Run() End Sub Sub RunSystem() If state <> LifecycleState.StartingUp Then Throw New Exception("Invalid lifecycle state") End If state = LifecycleState.Running AddHandler Builder._cruise.OnExiting, AddressOf ShutDownSystem Builder._cruise.Run() ' app exits when this call completes End Sub Sub ShutDownSystem() If state <> LifecycleState.Running Then Throw New Exception("Invalid lifecycle state") End If state = LifecycleState.ShuttingDown Builder._shutdown.Run() End Sub End Class Public Class CoordinatorStartup ' Gets a singleton instance of the Builder class. ReadOnly Property Builder() As Builder Get Return Builder.Singleton End Get End Property

Figure 8-2 shows the Undo Generation Rate and Tablespace Usage graph from the bottom of the OEM Undo Management page. This graph is color-coded so you can see at a glance how the undo tablespace is handling the amount of undo information generated in your instance.