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You use a baseline to capture the metric values for a specific period, and the database uses the baseline to set the threshold values for various metrics. A static baseline computes metric value statistics manually over a time period. A system moving window automatically captures the metric value statistics. You can use baseline metrics for computing alert thresholds. You can use three different methods to compare baseline statistics to current activity in the database: Significance level: Thresholds based on significance level use a statistical level to determine whether current levels of a metric are unusual. For example, if you set the significance level to 0.99 for a critical threshold, the database will issue an alert when more than 1% percent of the current metric values fall outside the metric value. Percentage of maximum: These are thresholds that are calculated based on the maximum value captured by the baseline. Fixed values: Fixed values are those set by the DBA, independent of any baselines. Adaptive thresholds, which use AWR baselines as sources of metric statistics, are ideal for creating alert thresholds. Once you select a group of metrics that represent your database workload, the database automatically configures and evolves adaptive thresholds by basing them on the SYSTEM_ MOVING_WINDOW baseline.

The best way to manage database alerts and related metrics is to use the OEM Database Control. You can also use the DBMS_SERVER_ALERT 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.

JMS Server JMS Producer Point-to-Point Queue Message Producer Messages Messages Message Consumer JMS Consumer

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. The Database Control (as well as the Grid Control) displays the alerts and can also send e-mail or pager notifications regarding the alerts. If you ve used the Oracle9i OEM, you re familiar with the Enterprise Manager alerts. Servergenerated alerts work in a similar fashion. In addition to 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 use of a particular resource 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 a.m. 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 the 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.

Figure 5-38. The basic architecture of a JMS system All messages are delivered using procedure calls. The JMS server, often called the provider in the JMS literature, acts as a central distribution center for messages. Producers and consumers are often referred to generically as clients. Messages are posted to a queue by the sender and subsequently delivered by the JMS server to the recipient. Although clients can create queues, you typically create and manage queues using an administrative tool. The JMS system architecture doesn t support distributed JMS servers. There is no predefined way for JMS servers to interoperate with each other. To support distributed servers, an implementation would need to create JMS servers that also acted as JMS producers and JMS consumers.

$ du -k /finance09 /finance09/lost+found /finance09/ffacts/home . . . 5348701 /finance09 $ As you can see in the preceding example, the du command indicates the actual space used by the various files and directories of the mount point (/finance09 in this case) and the total space used up by it. I prefer the df command over the du command, because I can see at a glance the percentages of free space and used space.