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In this example, the SHOW HM_RUN command shows the report filename under the REPORT_FILE column. Once you see the filename, you can view the report itself by issuing the SHOW REPORT HM_RUN command, as shown here: adrci> SHOW REPORT hm_run TestCheck1 If the REPORT_FILE column shows a NULL value, you must first generate the report file in the following manner: adrci> CREATE REPORT hm_run TestCheck1 Once you generate the report as shown here, you can use the SHOW REPORT HM_RUN command to view the report s contents.

As mentioned earlier, there is also a problem when the sender expects a value to return from subscribers: What if there are no subscribers There are four common solutions that you can use on the sender s side: Continue using a safe default, if possible Attempt an alternative action Throw an exception Stop the system Continuing with a safe default is the most common technique, but is only possible if such a value exists Whether a safe default exists is strictly application-dependent For example, consider an event notification used to fetch an integer value A return value of 0 may be a safe default, but perhaps even this value is potentially unsafe, preventing the system from continuing If an event has no subscribers, and no safe defaults are available, the sender may be able to proceed by taking an alternative action Popular choices are Fire a backup or alternative event.

The SQL Repair Advisor is a new tool that helps you navigate situations where a SQL statement fails with a critical error. For example, if there s a known bug that s causing a critical error, you can use the SQL Repair Advisor. Contrary to what its name indicates, the SQL Repair Advisor doesn t really rewrite or repair the offending SQL statement it recommends a patch that ll keep the SQL statement from erroring out. In other words, the advisor provides you a workaround for a problem SQL statement. Note that a SQL patch in this case is very similar to a SQL profile, and adopting the patch results in a change in the query execution plan. You can invoke the SQL Repair Advisor from the Support Workbench or with the help of the DBMS_SQLDIAG package. I explain both methods in the following sections.

Follow these steps to invoke the SQL Repair Advisor from the Support Workbench: 1. In the Support Workbench home page, click the ID of the problem you re trying to fix. 2. In the Problem Details page, click the problem message from the failed SQL statement. 3. In the Investigate and Resolve section on the Self Service tab, click SQL Repair Advisor. 4. Select the schedule for running the advisor and click Submit. Click View in the SQL Repair results page to view the Report Recommendations page. 5. Click Implement if you want the advisor to implement its recommendations. The SQL Repair Advisor presents a confirmation page after it implements the recommendations. When you migrate to a new release of the database, you can easily drop the patches you applied through the SQL Repair Advisor.

The following example illustrates how to create a SQL Repair Advisor task and to apply a SQL patch recommended by the advisor to fix a bad SQL statement.

Call a method to compute a fallback value Listing 8-9 shows C# Fire methods that use the two techniques when no listeners are available Listing 8-9 C# Fire Methods Taking Alternative Action If No Listeners Are Available public delegate string MyDelegate(); public event MyDelegate OnEventX; public event MyDelegate OnEventY;.