Oracle Database Monitoring: Active Monitoring to save proactively

There are various facets of database administration, among which database monitoring or Oracle database monitoring appears to be the most neglected one. How many DBAs monitor their databases? Data is a crucial element for any form of business. At times, data loss causes major business loss; and therefore, it is imperative to maintain the database, proactively. A database needs to be monitored to support production and SLAs (Service Level Agreement). It helps keep an eye on development and, most importantly, the database performance.

According to analysis, a huge amount spent after database crashes can turn into saving through regular database monitoring. Therefore, experts recommend that every business maintaining database warehouse should strictly add database monitoring to their DBA's profile. Monitoring Oracle database is a trend to check the health and performance of the database, proactively. Oracle database has a potential to monitor the vital signs related to the database health, analyze the workload and automatically identify any issue that needs DBA's attention.

Oracle database monitoring offers three techniques for monitoring Oracle databases—Status monitoring, Performance monitoring and Trend analysis. We will learn all three techniques in this article. Alerts form the basis of monitoring; and therefore in this article, we will also discuss the alerts and alert management.

Status monitoring, as the name defines, keeps a track of the current status of the events. It keeps check on the threshold value. A classic example of a status monitoring while monitoring Oracle database is a system notification before a tablespace fills up. Status monitoring generates timely reports when the threshold value—the boundary value that when crossed indicate the system in an undesirable state—is reached. Status monitoring happens at the database and OS level.

Performance monitoring: Oracle database monitoring includes a self-diagnostic engine called Automatic Database Diagnostic Monitor (ADDM). It monitors a defined set of performance statistics. DBAs have a privilege to define the set of critical activities that measure the database performance. We do that in an effort to maintain the database performance, increase the system up-time and ensure an uninterrupted data-flow to users. While monitoring Oracle database, we check hit ratios, latches, locks, waits, etc.

Trend analysis relates to collecting the historical data surrounding specified events. Most databases' monitoring techniques follow this practice to fix the real-time issue from recurrence. For example, from previous reports, we can analyze or predict the potential requirement of the tablespace.

Alerts play a significant role in monitoring. When we say that the system notifies us of any critical state, it actually sends an alert. DBAs can set alerts knowing the nature of their databases. Alerts may fall into a regular or a critical category depending on the issue in the database. DBAs can set alerts to perform some action such as running a script. Oracle database monitoring system, generally, enable an alert on high tablespace usage, snapshot too old, recovery area low on free space, and resumable session suspend.

Managing alerts means setting alert values and removing alerts, when not required. DBA manages alert. DBA sets the condition that should trigger an alert. When the condition that triggered the alert resolve and the metric value is no longer outside the boundary, Oracle database monitoring system clears an alert.

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