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Figure 8-25. A wiring diagram with only one signal The diagram shows a single notification signal, called DownloadComplete, being sent from A to B. If you implement the system using your naming convention, you could infer that object A would have two things: an event property called OnDownloadComplete and a fire method called FireDownloadComplete. To bind a handler to the event, subscribers would access A s OnDownloadComplete property. While the On naming pattern originated with Visual Basic, it was adopted by other systems, such as Microsoft Foundation Classes (MFC), COM, and Delphi. The use of a naming convention is good, because it simplifies the task of locating artifacts in the source code that aren t documented explicitly. The JavaBeans world uses a different naming convention that relates events, notification payload types, and listener interfaces. If an object supports an event named Action, then it can fire notifications that carry a payload of type ActionEvent. Listeners must expose an interface named ActionListener. The event source advertises the presence of its Action event by exposing the methods addActionListener and removeActionListener, which subscribers can call to subscribe and unsubscribe. As an example, consider the wiring diagram for a Java system, shown in Figure 8-26.

Fortunately, however, in this case the solution was fairly easy A review of some of the Oracle V$ tables (the V$ tables are one way Oracle exposes its instrumentation its statistics) revealed that the major contention was around a single table, a queue table of sorts We could see this based on the V$LOCK view, which would show us the blocked sessions, and V$SQL, which would show us the SQL that these blocked sessions were trying to execute The application would place records into this table, and another set of processes would pull the records out of this table and process them Digging deeper, we found a bitmap index on the PROCESSED_FLAG column in this table..

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Your application may again be the real culprit because it s doing too many unnecessary I/Os, even if they re mostly from the database buffer cache and not disk When you re examining wait ratios, understand that your goal isn t to make all the wait events go away, because that will never happen Learn to ignore the unimportant, routine, and unavoidable wait events As you saw in the previous section, wait events such as the SQL*Net message from client event reflect waits outside the database, so don t attribute these waits to a poorly performing database Focus on the total wait time rather than the number of wait events that show up in your performance tables and AWR reports Also, if the wait events make up only a small portion of response time, there s no point in fretting about them.

As Einstein might say, the significance of wait events is relative relative to the total response time and relative to the total CPU execution time Recently, there has been a surge in publications expounding the virtues of the wait event analysis-based performance approach (also called the wait interface approach) You can always use the buffer hit ratios and the other ratios for a general idea about how the system is using Oracle s memory and other resources, but an analysis of wait events is still a better bet in terms of improving performance If you take care of the wait issues, you ll have taken care of the traditional hit ratios as well For example, if you want to fix a problem that s the result of a high number of free buffer waits, you may need to increase the buffer cache.

Figure 8-26. Signals based on the JavaBeans naming pattern A and B exchange only one signal, called actionPerformed. Since the notification is delivered by a call through the ActionListener interface, you can infer that the signal is related to the Action event, and that a payload object of type ActionEvent is passed in the notification to B. In the source code for A, the actionPerformed notification might be sent by a Fire method named FireAction. The problem with the JavaBeans event naming convention is that it ties event names to internal plumbing details, such as interface and method names. When used on a wiring diagram, these names often don t provide enough information about what event was detected and what the event notification is telling the subscriber. In the previous diagram, you could use an Action event to notify object B of almost anything. The diagram provides no clues that might help you understand why the connection is made between A and B, and what the signal does. The situation is akin to an electrical diagram labeling a wire only by its color or its gauge, neither of which help understand what the wire is for.

are not just for low-cardinality values and why they are not appropriate for update-intensive columns.

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