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You can invoke the Segment Advisor at either the individual segment level or the tablespace level. You can call the Segment Advisor from the Database Control s Advisor Central page (which you can get to from the Database Control home page by clicking Advisor Central in the Related Links section, and then clicking Segment Advisor). Figure 17-6 shows the main Segment Advisor page. The Segment Advisor can generate advice at three levels: object, segment, and tablespace. The Segment Advisor s recommendations can be to either a shrink or a reorganization operation, based on the following criteria: If you created the objects in the default locally managed tablespaces with Automatic Segment Space Management, the Segment Advisor recommends shrinking the segments. If you used manual segment space management, or the object isn t eligible for a shrink operation, the Segment Advisor will recommend an object reorganization. You can run the Segment Advisor in two modes: Comprehensive analysis: The Segment Advisor will perform an analysis regardless of whether there are prior statistics or not. If there aren t any prior statistics, the Segment Advisor will sample the objects before generating its recommendations. This analysis is more time consuming. Limited analysis: This analysis is based strictly on the statistics collected on the segment. If there aren t any statistics for an object, the advisor won t perform any analysis. The AWR collects all space-usage statistics during its regular snapshot collection. The Segment Advisor, to estimate future segment-space needs, uses the growth-trend report based on the AWR space-usage data. You can view the Segment Advisor recommendations through OEM by clicking the Segment Advisor Recommendations link on the Segment Advisor page.

In Oracle Database 10.2 and later, Oracle provides an automatic Segment Advisor job called AUTO_ SPACE_ADVISOR_JOB, which automatically detects segment-space related issues. Here are the job details, which you can see using the DBA_SCHEDULER_JOBS view: JOB_NAME: AUTO_SPACE_ADVISOR_JOB PROGRAM_NAME: AUTO_SPACE_ADVISOR_JOB SCHEDULER_NAME: MAINTENANCE_WINDOW_GROUP The Segment Advisor job automatically runs during the maintenance window, identifying candidates for a segment-shrinking operation based on the amount of space fragmentation within an object. You can view the automatic Segment Advisor job recommendations in the same way as any other manually invoked Segment Advisor recommendations, as shown in the previous section. You ll see a list of the Segment Advisor recommendations, from the last time it ran, by clicking the Segment Advisor Recommendations link on the Segment Advisor page. Figure 17-7 shows the Recommendations page.

Oracle is capable of recovering from an unexpected database crash without losing any data. Remember that when the database crashes, there are two phases to the ensuing recovery: Redo or roll-forward phase: In the first phase, the database applies to the datafiles all changes, including both committed as well as uncommitted changes, that haven t yet been made a part of the datafiles. These transactions are recovered from the redo log. Undo or rollback phase: In the second phase, all uncommitted transactions that are written to the datafiles in the previous step are undone. After a crash, the database can t be opened unless it performs recovery. However, here s the interesting part: Oracle lets you open the database before the second phase is completed. As soon as the redo or roll-forward phase is over, the database is opened for the users, while the SMON process performs the undo in the background. When a user s process runs into a transaction locked for rollback, it rolls back the transaction quickly. These intermittent rollbacks don t have a discernible impact on the user s query performance. This means that the database is open far more quickly after a crash than if you waited for both phases of recovery to complete.

7. Richard P. Feynman, He Fixes Radios by Thinking!, Surely You re Joking, Mr. Feynman! Adventures of a Curious Character (New York: W. W. Norton & Company, 1984).

The time it takes for the second phase (the rollback) to complete depends on how much undo information you have to roll back.

As of Oracle Database 10g, you can automate checkpoint tuning by completely avoiding the setting of any checkpoint-related initialization parameters and by setting the FAST_START_MTTR_ TARGET parameter to a nonzero value. By default, the value of this parameter is 0. Oracle will automatically tune database checkpointing, balancing recovery needs with the overhead on database throughput.

There is no subscript to the Inverse function, indicating that G is the inverse of F for all possible initial system states. In the rest of this discussion, assume that G is the unbounded inverse of F. Note that the is-inverse-of relationship, being a special case of the is-complement-of relationship, is not commutative. The fact that G can invert the results of F doesn t entail that F can invert the results of G. G is a completely different algorithm from F. For all we know, G might not even have an Inverse function.