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In addition to the default alerts, you can choose to use other alerts, and you can also change the thresholds for the default alerts. You can perform these tasks with the help of the OEM Database Control or with Oracle-supplied PL/SQL packages. You can also use the Database Control to set up notification rules; for example, you could specify a blackout period for the alerts, during which no alerts would be sent out by the database. When the database issues an alert, you can see it in the Database Control Alerts table (see Figure 18-2), which is located at the bottom of the Database Control home page, and you ll receive a notification if you ve configured the system to send you one. The alert data is, by default, updated every 60 seconds. To get the details of an alert, click on the alert message in the Message column of the Alerts table. The alerts usually are accompanied by a recommendation to fix the problem as well.

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Figure 18-2. The Database Control Alerts table Make sure you set the STATISTICS_LEVEL parameter to TYPICAL or ALL in order to use the servergenerated alerts feature. In addition, you can display alerts directly by subscribing to the alert queue.

The best way to manage database alerts and related metrics is to use the OEM Database Control. You can also use the DBMS_SERVER package to manage alerts, or you can access the alert queue directly. The following sections explain the default server-generated alerts and how to manage them.

Oracle automatically sends an alert message to a persistent queue named ALERT_QUE and OEM reads this queue and sends out notifications about the outstanding server alerts. Database Control (as well as Grid Control) displays the alerts and can also send e-mail or pager notifications regarding the alerts.

If either of those two variables (MYID and MYOID) is not root, you have to assume that someone has become root using su -. The for loop then determines which variable is not root and sets MYID to that user. Now that MYID is set to the appropriate user, the script needs to find that user s home directory.

int main() { MyNamespace::SampleClass^ obj = gcnew MyNamespace::SampleClass(); for each(Assembly^ a in AppDomain::CurrentDomain->GetAssemblies()) { Console::WriteLine(a->FullName); Console::WriteLine("\t" + a->CodeBase); Console::WriteLine("\t" + a->Location); } } If you execute this code, you should see an output similar to the following: mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 file:///C:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\mscorlib.dll DumpAssemblyInfo, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null file:///C:/tests/DumpAssemblyInfo.exe C:\tests\DumpAssemblyInfo.exe SampleLib, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null file:///C:/tests/SampleLib.DLL C:\tests\SampleLib.dll

If you ve used the Oracle9i OEM, you re familiar with the Enterprise Manager alerts. Servergenerated alerts work in a similar fashion. In addition having Oracle send alerts, now you can configure alert thresholds as well.

It is very easy to set your own warning and critical thresholds for any database metric. To set alert thresholds, go to the Database Control home page and click the Manage Metrics link, which you ll find under the Related Links group. On the Manage Metrics page, click the Edit Thresholds button. You ll see the Edit Thresholds page, as shown in Figure 18-3. For each metric on the Edit Thresholds page, you can set the following: Warning and critical thresholds: You can set an arbitrary threshold or compute a threshold based on a set of baselines for a metric. For example, you might specify that the database should generate a threshold alert if a resource use is 15 percent higher than its normal baseline values. You can also specify multiple thresholds. Response action: This action can be a SQL script or an operating system command. Oracle will automatically execute this response action immediately when the alert is generated. Make sure that you provide the complete path to the SQL script or operating system command, so the OEM Agent can find it.

Notification rules enable you to control the conditions under which you want to receive a message from the OEM. For example, you may not want to be awakened at 2:00 AM just because a tablespace with 100GB of allocated space has reached an 80 percent usage level. On the other hand, you would surely want to know immediately when a 200MB tablespace has crossed the 97 percent usage level. You can use OEM Database Control to set notification rules through the Preferences page. On the Database Control home page, click the Preferences link (at the very bottom of the page) to go to the Preferences page. Then click the Rules link in the Notification section. Select any metric, such as Listener Availability, and click the Edit button. From here, you can set notification rules for a selected event.