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Under AUM, the Oracle database collects undo data and stores it in the undo segments. Traditionally, Oracle has used data in the undo segments to provide read consistency for queries, to roll back transactions, and to recover terminated transactions. Starting with Oracle9i, undo data has been used for even farther-reaching purposes to query past data and recover from logical errors in the data. Undo data also supports the new Flashback features at the row and table levels. The UNDO_RETENTION initialization parameter enables you to specify the length of time undo information must be saved in the undo segments. Oracle Database 11g automatically tunes undo information by collecting statistics on the longest-running queries and the undo generation rate in your database. If you don t set the UNDO_RETENTION parameter or specify a zero value for the parameter, Oracle automatically tunes undo, using 900 seconds as the default value for the UNDO_RETENTION parameter. By setting a higher value than the default of 900 seconds, you can keep undo records longer and go back further in the past. Since several Flashback features in Oracle Database 11g rely on undo data, you should set the UNDO_RETENTION parameter much higher than the default value. (In addition to enabling more effective Flashback features, this will reduce the probability of snapshottoo-old errors.)

Guaranteed undo retention simply means that Oracle will retain undo data for the entire length of the undo retention period you specify, no matter what. That is, if you specify half an hour as the undo retention interval, Oracle will retain the undo data for the full 30 minutes, under all circumstances. If you run out of room for recording the undo information generated by new transactions, any new DML transactions will fail, since Oracle won t be able to store the undo information for those changes. Thus, there is a trade-off between guaranteeing undo information and the potential failure of some DML statements.

By default, Oracle doesn t guarantee undo retention; the default retention time is 900 seconds (15 minutes) if you decide to guarantee undo retention.

Figure 11-12. The wiring diagram of the startup system Listing 11-1 and Listing 11-2 show C# and VB .NET implementations of the LifecycleCoordinators. Listing 11-1. The C# Implementation of the LifecycleCoordinators public class LifecycleCoordinator { // The main entry point for the application [STAThread] static void Main() { LifecycleCoordinator coordinator = new LifecycleCoordinator(); coordinator.Start(); // app exits when this call completes }

You can specify guaranteed undo retention for the undo tablespace when you create the database, or by specifying the RETENTION GUARANTEE clause while creating a new undo tablespace, as shown here: SQL> CREATE UNDO TABLESPACE undotbs01 2 DATAFILE 3 '/u01/orcl/oradata/undotbs01_01.dbf' 4 SIZE 10M AUTOEXTEND ON 5* RETENTION GUARANTEE; Tablespace created. SQL> You can also use the ALTER TABLESPACE command to guarantee undo retention in your database, as shown here: SQL> ALTER TABLESPACE undotbs01 RETENTION GUARANTEE; You can use the RETENTION NOGUARANTEE clause to turn off the guaranteed retention of undo information, as shown in the following example: SQL> ALTER TABLESPACE undotbs01 RETENTION NOGUARANTEE;

A high value for the UNDO_RETENTION parameter doesn t guarantee the retention of undo data for the duration specified by the UNDO_RETENTION parameter. You must use the RETENTION GUARANTEE clause to guarantee undo retention for a specified time.

Let s say you ve configured guaranteed undo retention in your database by using the RETENTION GUARANTEE clause. If your undo tablespace is too small to accommodate all the active transactions that are using it, the following will happen: Oracle will issue an automatic tablespace warning alert when the undo tablespace is 85 percent full (if you haven t disabled the automatic tablespace alert feature). Oracle will also issue an automatic tablespace critical alert when the undo tablespace is 97 percent full. All DML statements will be disallowed and will receive an out-of-space error. DDL statements will continue to be allowed.