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How do I monitor Oracle Database performance using Enterprise Manager (OEM)?

Emily Anne Brown

Mar 13, 2025 pm 01:28 PM

How do I monitor Oracle Database performance using Enterprise Manager (OEM)?

To monitor Oracle Database performance using Oracle Enterprise Manager (OEM), you need to follow these steps:

Access Oracle Enterprise Manager: Log into the OEM console using your credentials. Ensure you have the necessary permissions to access the database you wish to monitor.
Navigate to the Database Home Page: Once logged in, navigate to the 'Targets' menu and select 'Databases'. From the list of databases, click on the one you want to monitor to access its home page.
Explore Performance Monitoring Tools: On the database home page, you can find several sections dedicated to performance monitoring, such as:
- Performance Tab: Provides an overview of current database performance metrics.
- Performance Hub: Offers a detailed view of real-time performance metrics, SQL statements, wait events, and more.
- ASH Analytics (Active Session History): Allows you to view historical data on session activity.
- SQL Monitor: Enables you to monitor and analyze SQL statements that are running or have run in the database.
Use Performance Dashboards: OEM provides customizable performance dashboards where you can drag and drop various charts and metrics to create a view tailored to your needs.
Review Diagnostic and Tuning Packs: If available, use the Diagnostic Pack for detailed performance analysis and the Tuning Pack for SQL statement tuning.

By regularly reviewing these sections and tools, you can keep a close eye on the health and performance of your Oracle Database.

What metrics should I focus on when using OEM to monitor Oracle Database performance?

When monitoring Oracle Database performance using OEM, several key metrics should be at the forefront of your attention:

CPU Usage: High CPU usage can indicate resource-intensive operations or poorly optimized queries. Monitor the 'CPU Used' and 'CPU Utilization' metrics.
Memory Usage: Pay attention to metrics like 'SGA (System Global Area) Usage' and 'PGA (Program Global Area) Usage' to ensure the database has enough memory allocated.
I/O Performance: Metrics such as 'Database Throughput (IOPS)', 'Read/Write Latency', and 'I/O Megabytes per Second' are critical for understanding disk performance.
Wait Events: Use the 'Top Wait Events' metric to identify what operations are causing the database to wait, which can pinpoint performance bottlenecks.
SQL Execution Time: Monitor 'SQL Response Time' and 'SQL Execution Statistics' to identify slow-running queries that may need tuning.
Database Connections: Keep an eye on the number of 'Active Sessions' and 'Total Sessions' to ensure your database is not hitting session limits.
Redo Log Generation: Monitor 'Redo Generated Per Second' as excessive redo generation can indicate heavy transaction activity that might require further optimization.
Database Availability: Check the 'Up Time' and 'Down Time' metrics to ensure the database remains available and operational.

By focusing on these metrics, you can quickly identify and address any performance issues that arise.

How can I set up alerts in OEM to proactively manage Oracle Database performance?

Setting up alerts in OEM allows you to be notified of performance issues before they become critical. Here’s how to do it:

Navigate to the Database Home Page: Go to the database you want to monitor, as described earlier.
Access the Metric and Policy Settings: From the database home page, click on the 'Oracle Database' menu and select 'Monitoring' then 'Metric and Policy Settings'.
Select the Metric: Choose the metric you want to set an alert for from the list provided. This could be any of the performance metrics discussed earlier.
Configure the Alert: Set the threshold values for the metric (e.g., warning and critical thresholds). You can define these thresholds based on your performance requirements and historical data.
Set Notification Methods: Specify how you want to be notified when the alert is triggered. Options include email, SNMP traps, or integration with third-party systems.
Save and Enable the Alert: After configuring the alert, save your settings and ensure the alert is enabled.
Review and Adjust Alerts: Periodically review the alerts to ensure they are still relevant and adjust thresholds as necessary based on changing performance patterns.

By setting up alerts, you can proactively manage your Oracle Database performance and address issues as they arise.

Can I use OEM to track historical performance data of my Oracle Database?

Yes, Oracle Enterprise Manager (OEM) can be used to track historical performance data of your Oracle Database. Here's how you can access and utilize this feature:

Access the Performance Hub: From the database home page, navigate to the 'Performance' tab and click on 'Performance Hub'.
Use ASH Analytics: Within the Performance Hub, click on 'ASH Analytics'. Active Session History (ASH) provides a detailed view of past session activity, allowing you to analyze performance over time.
Analyze Historical Data: Use the time range selector to specify the period you want to analyze. ASH Analytics allows you to drill down into various performance metrics and wait events for that period.
Generate and Save Reports: You can generate reports within ASH Analytics, which can be saved and reviewed later. This is useful for comparing performance over different time frames.
SQL Monitor: For historical SQL performance data, use the SQL Monitor feature to review the performance of SQL statements that have run in the past.
AW Reports (Automatic Workload Repository Reports): Generate AWR reports to get a comprehensive view of database performance over a specified time period. These reports can be accessed from the 'Performance' menu.

By utilizing these tools within OEM, you can effectively track and analyze the historical performance data of your Oracle Database, helping you to identify trends, diagnose issues, and optimize performance over time.

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