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Once you re aware of a performance problem due to high waits, you can use these segment-level views to find out exactly which table or index is the culprit and fix that object to reduce the waits and increase database performance The V$SEGMENT_ NAME view provides you with a list of all the segment levels that are being collected, and tells you whether the statistics are sampled or not Let s see how you can use these segment-level views to your advantage when you re confronted with a high number of wait events in your system Say you look at the V$SYSTEM_EVENT view and realize that there are a large number of buffer busy waits You should now examine the V$SEGMENT_STATISTICS view with a query such as the following to find out which object is the source of the high buffer busy waits.

Figure 8-21. A multicast notification Any number of subscribers may be present. When using procedure calls to deliver notifications, the sender maintains a list of subscribers and calls them in some order. In peer-to-peer (P2P) systems, one peer can subscribe to the events of another peer. An event fired by one peer may be multicast to others recursively, resulting in a cascaded multicast, as shown in Figure 8-22. In P2P systems, events are typically fired asynchronously using messages, so P1 would not block while the notification rippled through the rest of the system. When sending notifications as messages, multicasting can also be handled independently at the communication substrate level, again saving the event source from having to block while subscribers are notified. Multicasts are handled this way in an IP network, where IP routers assume the task of multicasting. The original sender in this case is oblivious to the fact that multiple subscribers are receiving its notifications.

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You can then decide on the appropriate corrective measures for this wait event, as discussed in the section Important Oracle Wait Events later in this chapter SQL> 2 3 4* SELECT owner, object_name, object_type, tablespace_name FROM V$SEGMENT_STATISTICS WHERE statistic_name='buffer busy waits' ORDER BY value DESC; OBJECT_NAME -------------LAB_DATA LAB_ADDR_I PERS_SUMMARIES OBJECT_TYPE ----------TABLE INDEX TABLE TABLESPACE_NAME ----------------LAB_DATA_D LAB_DATAS_I PERS_SUMMARIES_D.

and finally, we generate the report: ops$tkyte@ORA10GR1> exec runstats_pkg.rs_stop(1000000) Run1 ran in 5810 hsecs Run2 ran in 14712 hsecs run 1 ran in 39.49% of the time Name Run1 Run2 Diff STAT...recursive calls 8,089 1,015,451 1,007,362 STAT...db block changes 109,355 2,085,099 1,975,744 LATCH.library cache 9,914 2,006,563 1,996,649 LATCH.library cache pin 5,609 2,003,762 1,998,153 LATCH.cache buffers chains 575,819 5,565,489 4,989,670 STAT...undo change vector size 3,884,940 67,978,932 64,093,992 STAT...redo size 118,854,004 378,741,168 259,887,164 Run1 latches total versus runs -- difference and pct Run1 Run2 Diff Pct 825,530 11,018,773 10,193,243 7.49% PL/SQL procedure successfully completed.

Selecting data from V$ dynamic performance views and interpreting them meaningfully isn t always so easy to do. Because the views are dynamic, the information that they contain is constantly changing as Oracle updates the underlying tables for each wait event. Also, the wait-related dynamic performance views you just examined don t provide crucial data such as bind variable information. For a more detailed level of wait information, you can use one of the methods described in the following sections.

If an event has multiple subscribers, what order should be used to notify subscribers One approach is to allow subscribers to provide a notification priority when they subscribe. Subscribers can then be notified in order of priority. But what happens if two subscribers have the same priority (or no priority) The most natural order is first-come, first-serve. Ensuring this order is not as easy as one might think. If you chose to manage the list of subscribers using a collection like a C# ArrayList or a Java Vector, you could use the Add method to add a reference to each new subscriber. Subscribers would then be ordered in the collection according to their subscription order. Say there are three subscribers: S1, S2, and S3. Let s see what would happen if S1 later unsubscribed and a new subscriber S4 showed up. When adding S4 to the collection, the collection s Add method might put S4 in S1 s old slot, which is available. If this happened, the subscribers would subsequently be notified in the order S4, S2, S3, which isn t the order you wanted. To prevent this, the collection would have to be normalized each time a subscriber is removed. The normalization process would remove all the empty slots created by Remove operations from the collection.

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