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  Oracle Tips by Burleson

Easy Oracle Automation
Chapter 4 -
Automatic Workload Repository and Automatic Database Diagnostic Monitor

Server Generated Alerts

For sending alerts pushed to a third party tool or paging software, subscribe to alert_que with the dbms_aqadm.add_subscriber procedure. Use the enable_db_access procedure to associate a database user with the subscribing agent. Optionally, an asynchronous notification can be received by enqueing alerts using alert_que. Subscribers will have to de-enqueue the message metadata to get the content. For enqueue notifications through email or HTTP posts, configure the database server through dbms_aqelm with information on mail server or proxy server.

How are Alerts Recorded by AWR?

Background processes periodically flush the data to the Automatic Workload Repository. Thus the AWR captures a history of metric values. The alert history table and alert_que are automatically purged  periodically by the system.

The tablespace alert feature is currently coded to wake up every 10 minutes and check for tablespace related alerts. Currently there is no way to change this behavior without changing the code. The 10-minute interval is only specific to the tablespace alerts, other alerts can have different values. For example, if the alert is matrix based, then the interval can be set to every one minute since MMON collects metrics every minute and will compare them to their thresholds.

In order to set and view the threshold values using Enterprise Manager, do the following steps:

  1. Invoke OEM and connect to the database.

  2. On the Home page, click on the Manage Metrics link at the bottom of the page.

Figure 4.1 - Manage Metrics


The above text is an excerpt from:

Easy Oracle Automation
Oracle10g Automatic Storage, Memory and Diagnostic Features

ISBN 0-9745993-6-0

by Dr. Arun Kumar R.

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