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default be three administrators: SYS, SYSMAN, and SYSTEM A site making use of Enterprise Manager would usually have created additional users Select the radio button for the user who is to subscribe to one or more rules, click the Edit button to make sure he/she has an e-mail address set up, and then click the Subscribe To Rules button to reach a list of all the public rules, where the ones for which the user is to receive notifications by e-mail can be selected Notifications sent with any of the other methods (PL/SQL, OS command, or SNMP) do not need this step; the code written to implement the PL/SQL procedure, the operating system script, or the SNMP trap should handle the propagation of the notification
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EXERCISE 13-4 Configure Alerts
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In this exercise, you will enable an alert for the commit rate and demonstrate its use 1 Connect to your database with Database Control as user SYSTEM 2 From the database home page, take the Metric And Policy Settings link in the Related Links section 3 Make sure that the View box is set to All Metrics, and scroll down to the User Commit (per second) metric 4 Set the Warning and Critical thresholds to 1 and 4 respectively These are artificially low thresholds that it will be simple to cross Click the OK button to save this change
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Manage Alerts and Thresholds
5 Connect to your database as user SYSTEM with SQL*Plus, and issue the COMMIT command a few times quickly:
SQL> commit; Commit complete SQL> / Commit complete SQL> / Commit complete SQL> / Commit complete SQL> / Commit complete
6 In your Database Control session, within a few seconds you will see that the alert has been raised, as shown here:
7 Tidy up, by returning to the Edit Thresholds window and clearing the threshold values
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Database Maintenance
INSIDE THE EXAM
The Self-Managing Database
Many of the topics in this chapter are covered in greater detail elsewhere in the OCP curriculum However, a general knowledge of the self-managing systems is required for this exam At the core of the self-management capabilities is the statistics-gathering mechanism: optimizer statistics on database objects, and AWR statistics on the instance and the database These are gathered and used automatically There are APIs for gathering and using both types of statistics, but the automatic mechanisms and the graphical interface presented by Enterprise Manager make using these optional The configuration installed in a database created with DBCA may well be all that is required Statistics are stored in the AWR, gathered and maintained by the MMON background process The MMON process is also responsible for raising alerts The Alert system compares preconfigured threshold values for certain metrics with real-time activity figures and, if a threshold is crossed, raises an alert Alerts can be notified by Enterprise Manager, or by any other tool that subscribes to the alert queue
CERTIFICATION SUMMARY
Accurate statistics on the objects in the database are essential if the optimizer is to be allowed to generate efficient SQL execution plans Gathering of these optimizer statistics can be (and is by default) completely automatic The AWR stores another class of statistics: instance and database activity and performance statistics Gathering these is also automatic Built on top of the AWR data is an advisor framework: wizards that will analyze activity and recommend actions to improve performance First among the advisors is the ADDM Also reliant on the AWR is the Alert system This consists of thresholds for any of hundreds of metrics, which (when passed) will cause the MMON process to raise an alert message
Two-Minute Drill
TWO-MINUTE DRILL
Use and Manage Optimizer Statistics
Object statistics are gathered automatically, unless STATISTICS_LEVEL
is BASIC
Object statistics are not maintained in real time The AWR stores a history of object statistics; the current statistics are stored
in the data dictionary
Use and Manage the Automatic Workload Repository
By default, snapshots are taken every hour and stored for eight days Additional snapshots can be taken on demand Snapshots can be preserved indefinitely if nominated for a baseline MMON is responsible for creating snapshots and launching the ADDM The AWR consists of tables (and related objects) in the SYSMAN schema,
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