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There is an API (the DBMS_SERVER_ALERT package) for setting thresholds For example:
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1 2 3 4 5 6 7 8 9 10 11 execute dbms_server_alertset_threshold(metrics_id=>dbms_server_alertredo_generated_sec,warning_operator=>dbms_server_alertoperator_ge,warning_value=>'1000000',critical_operator=>dbms_server_alertoperator_ge,critical_value=>'2000000',observation_period=>1,consecutive_occurrences=>5,instance_name=>'ORCL11G',object_type=>dbms_server_alertobject_type_system,object_name=>null);
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Taking this PL/SQL execution call line by line: 1 The procedure SET_THRESHOLD will create or update an alert threshold 2 The metric being set is the rate of redo generation, measured in bytes per second 3 The comparison operator for the warning level, which is greater than or equal to 4 The value for a warning alert, which is 1 MB a second 5 The comparison operator for the critical level, which is greater than or equal to 6 The value for a critical alert, which is 2 MB a second 7 The observation period, in minutes 8 The number of consecutive occurrences before the alert is raised 9 The instance for which the alert is being configured 10 The type of object to which the alert refers 11 The name of the object to which the alert refers Note that not all the arguments are relevant for all alerts The preceding example configures an alert for the rate of redo generation; a warning will be raised if this exceeds 1 MB a second, and a critical warning if it goes over 2 MB a second The observation period is set to a minute and consecutive occurrences to five; this means that if the redo generation happens to hit a high level just a couple of times, it will not be reported but if it stays at a high level consistently (for five consecutive minutes), then it will be reported As this metric is
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one that could vary between instances in an RAC environment, the instance name must be specified, but the object name is not relevant If the alert were for tablespace usage, then the instance name would not be specified, the object type would be tablespace, and the object name would be set to the name of the tablespace To reach the graphical interface for setting thresholds, take the Metric And Policy Settings link in the Related Links section on the database home page This will show all the metrics with their settings Clicking the Edit symbol for a metric will take you to the window where the thresholds can be set Figure 13-10 shows this for the Redo Generated (per second) metric, after executing the procedure call just described The graphical interface does not give access to all the settings for all the metrics; in this case, you cannot specify an observation period (it always set to one minute) and have no choice of comparison operators
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The default notification mechanism for stateful alerts is nothing more than displaying them in Enterprise Manager on the database home page, and writing them to the DBA_OUTSTANDING_ALERTS view They will remain visible until they are cleared They may be cleared because the DBA has fixed the problem, or in some
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cases the problem will go away in the natural course of events For instance, a tablespace-usage alert would usually require DBA action (such as adding another datafile), whereas an activity-related alert such the rate of redo generation might clear automatically when the activity reduces When an alert is cleared, within the database it is removed from the DBA_ OUTSTANDING_ALERTS view and written to the DBA_ALERT_HISTORY view Stateless alerts go straight to the history view If any notification beyond the default is needed, this must be configured within Enterprise Manager The Enterprise Manager notification system requires configuration at three levels:
A notification method must be configured A rule must be created to catch the event An administrator must subscribe to the rule
To set up notification methods in Database Control, take the Setup link visible in most Database Control windows at the top right and bottom center, and then the Notification Methods link in the left-hand side menu bar From here, you specify the address of the SMTP server to which Database Control should send e-mail notifications, with authentication details and a reply address From this window, shown in Figure 13-11, you can also define additional notification methods The alternative notification methods can be seen at the bottom of Figure 13-11: operating system commands or scripts, PL/SQL procedures, or an SNMP trap (which lets Database Control integrate with any SNMP management system that may be available) Having defined the notification method, create a rule Take the Preferences link visible in most Database Control windows at the top right and bottom center, then the Rules link in the left-hand side menu bar There are several preconfigured rules To create a new one, click Create and give the rule a name; select the Public check box to make it available to other uses Then click the Metrics button, if the rule is for a metric, and select which metrics the rule should monitor Figure 13-12 shows adding the Redo Generation (per second) metric to a rule The final step is for a user to subscribe to the notifications From the Setup link again, choose Administrators on the left-hand side menu bar There will by
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