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The best approach, as well as the recommended one, to end-to-end tracing is to use the OEM Database Control. This way, you don t have to bother with manual runs of the DBMS_MONITOR package. Here are the steps: 1. From the Database Control home page, click the Performance link. 2. In the Performance page, click the Top Consumers link under the Additional Management Links section. 3. In the Top Consumers page, you ll see the tabs for Top Services, Top Modules, Top Actions, Top Clients, and Top Sessions, as shown in Figure 19-2. Click the Top Clients tab. 4. To enable aggregation for a client, select the client and click Enable Aggregation. If you wish, you can use the Database Control to trace a normal SQL session instead of using the SET_TRACE command and the TKPROF utility. To trace a user command, in step 3 of the preceding sequence, click the Top Sessions tab. You then click the Enable SQL Trace button. You can then use the Disable SQL Trace button to stop the session tracing and view the output by clicking the View SQL Trace File button.

You can view all outstanding trace information in your instance by examining the DBA_ENABLED_TRACES view, or use a trace report generated through the Database Control.

Optimization techniques with event-based systems must necessarily be dynamic and be based on the observation of the system while it is running There is an irony in the performance analysis of component-based systems: The analysis may pinpoint problems that you can do little to correct, because the majority of optimizations often require modification of source code When using third-party components, you often don t have access to the source code Before any optimizations are done, you need to know what the event profile of the system is An event profiler is a tool that essentially single-steps a system, much like a traditional debugger Each time an event is fired, an entry is made in a profile log The system is then run for a long enough time to build a statistically significant profile log The log will then show the firing order of events in the system.

The V$SQL view is an invaluable tool in tracking down wasteful SQL code in your application. The V$SQL view gathers information from the shared pool area on every statement s disk reads and memory reads, in addition to other important information. The view holds all the SQL statements executed since instance startup, but there s no guarantee that it will hold every statement until you shut down the instance. For space reasons, the older statements are aged out of the V$SQL view. It s a good idea for you to grant your developers select rights on this view directly if you haven t already granted them the select any catalog role. You can use the V$SQL view to perform ad hoc queries on disk and CPU usage, but remember that the AWR report includes summaries of these kinds of information. The V$SQL view includes, among other things, the following columns, which help in assessing how many resources a SQL statement consumes: rows_processed gives you the total number of rows processed by the statement. sql_text is the text of the SQL statement (first 1,000 characters). sql_fulltext is a CLOB column that shows the full text of a SQL statement. buffer_gets gives you the total number of logical reads (indicates high CPU use). disk_reads tells you the total number of disk reads (indicates high I/O). sorts gives the number of sorts for the statement (indicates high sort ratios). cpu_time is the total parse and execution time. elapsed_time is the elapsed time for parsing and execution.

parse_calls is the combined soft and hard parse calls for the statement. executions is the number of times a statement was executed. loads is the number of times the statement was reloaded into the shared pool after being flushed out. sharable_memory is the total shared memory used by the cursor. persistent_memory is the total persistent memory used by the cursor. runtime_memory is the total runtime memory used by the cursor.