How to Analyze an AWR Report in Oracle 11g

Introducing the world of analyzing AWR reports in Oracle 11g! It’s creative, professional and bursting with info.

Analyzing AWR reports is a must for optimizing Oracle software performance. These reports contain valuable details. Admins can find top SQL statements, wait events, resource use and more. With this knowledge, admins can get the most out of their systems.

AWR reports are a modern and efficient way to monitor performance. But they have historical significance too. Oracle Corporation created them in response to customer requests. AWR reports have changed the way admins optimize databases.

Understanding AWR Reports

Analyzing an AWR Report needs attention. Start by looking into the Database Summary section. It gives details on CPU usage, memory allocation, and I/O operations. This helps find any issues that are slowing down performance.

Then, check the SQL Statistics part. Here, you’ll see data about SQL statements with high-load and their plans. You can make them more efficient by finding resource-heavy queries or badly written code.

After that, review the System Statistics part. It shows system-wide resource use like CPU and I/O. Knowing these stats can show hardware limitations or wrong settings that have an effect on database performance.

Also, AWR Reports contain Wait Events info. These tell when the database was idle due to certain things. By examining wait events, administrators can spot what is causing delays and how to fix them.

To understand the importance of AWR Reports, let’s look at an example. XYZ Corporation had slow response times with Oracle 11g. An AWR Report showed they had a SQL statement using too much CPU. After optimizing the query and adding indexes, the company saw a great improvement in performance.

How to Generate an AWR Report in Oracle 11g

For Oracle 11g, generating an AWR report requires a precise process. Here’s a guide:

  1. Decide the time interval to generate the report.
  2. Connect to the database with SQL*PLUS or other tool.
  3. Execute these commands:
  1. Alter session set timed_statistics = true;
  2. Alter session set statistics_level = all;
  3. Execute dbms_workload_repository.create_snapshot();

Wait for the desired time interval.

Generate the AWR report:

  1. Select /* +RULE */ dbms_workload_repository.awr_report_text(,) from dual;

You must have appropriate privileges and access rights assigned by a DBA.

Plus, for accurate capturing, have STATISTICS_LEVEL set to ALL and TIMED_STATISTICS set to TRUE at both the instance and session levels.

Analyzing AWR Reports in Oracle 11g

Let’s dig deeper. Review CPU Usage in the AWR report. It shows how much processing power is used. High usage suggests optimization or hardware upgrades.

Next, focus on wait events. These are when processes wait for resources or actions. Fixing them will improve performance.

Also, analyze SQL statements. The report points out costly queries and inefficient plans. Optimizing or rewriting them boosts performance.

Look at top segments too. They show objects with high disk reads or memory usage. Optimize them for better performance.

Pro Tip: Analyzing an AWR report isn’t just finding issues. Understand their impact on system performance. Look through the report to find ways to optimize and enhance.

Troubleshooting Common Performance Problems

Troubleshooting Oracle 11g requires expertise. So, let’s deep-dive into analyzing an AWR report!

First off, to tackle performance issues, identify any abnormalities or bottlenecks in the AWR report.

Next, gather extra info and metrics to comprehend the root cause of the issue. This could include examining indexes, queries, or system resources.

Then, once you have the data, devise a plan to improve performance. This could involve optimizing SQL queries, changing configurations, or allocating more resources.

Analyzing an AWR report gives valuable insights into Oracle 11g performance. By recognizing issues, collecting relevant data, and executing specific solutions, organizations can increase their system’s productivity and efficiency.

Oracle Corporation highlights analyzing AWR reports as an essential step in diagnosing and resolving performance problems in Oracle 11g.


Analyzing an Oracle 11g AWR report requires a close look at performance metrics and possible issues. CPU use, wait events, and SQL statements should all be examined.

Moreover, it’s important to review the database configuration parameters and spot any bottlenecks. Disk I/O and memory utilisation can also indicate potential resource problems.

On top of that, understanding the influence of indexes and query execution plans is essential for optimising SQL statements. Examining existing indexes and identifying chances for new or modified ones can really boost query performance.

In conclusion, analyzing an AWR report needs a thorough approach, combining technical know-how and system architecture knowledge. With the insights from this analysis, administrators can make smart decisions to improve database performance.

Frequently Asked Questions

1. How do I generate an AWR report in Oracle 11g?

To generate an AWR (Automatic Workload Repository) report in Oracle 11g, you can use the following steps:

  1. Connect to your Oracle database as a user with DBA privileges.
  2. Execute the command “SELECT snap_id, begin_interval_time, end_interval_time FROM dba_hist_snapshot;” to retrieve the snapshot IDs and corresponding time intervals.
  3. Note down the snap_id values for the desired time interval you want to analyze.
  4. Run the command “EXEC dbms_workload_repository.create_snapshot();” to create a new snapshot.
  5. Perform the workload or troubleshooting activities you want to analyze.
  6. Issue the command “EXEC dbms_workload_repository.create_snapshot();” again to create another snapshot.
  7. Finally, generate the AWR report using the command “SELECT * FROM table(dbms_workload_repository.awr_report_html(snap_id1, snap_id2));” where snap_id1 and snap_id2 are the values noted earlier.

2. How can I interpret the key sections of an AWR report?

An AWR report consists of several sections, and understanding the key ones is essential for analysis:

– Overview: Displays high-level performance statistics, such as database time and CPU usage.
– Time Model Statistics: Breaks down the database’s activity by component, helping identify areas of resource consumption.
– Top 5 Timed Events: Shows the most significant events consuming database time.
– SQL Statistics: Highlights the top SQL statements by consumption, assisting in query performance analysis.
– Instance Efficiency Statistics: Gives insights into the database’s buffer cache, library cache, and disk I/O efficiency.
– Operating System Statistics: Presents operating system-related metrics affecting database performance.
– Wait Events: Lists events the database is waiting for and helps identify bottlenecks.
– …

3. How can I identify performance bottlenecks using an AWR report?

An AWR report helps identify performance bottlenecks through the following steps:

  1. Examine the “Top 5 Timed Events” section to identify the most time-consuming events.
  2. Evaluate the “SQL Statistics” section to find poorly performing SQL statements.
  3. Analyze the “Wait Events” section to identify resource contention issues.
  4. Check the “Operating System Statistics” section to identify any OS-related bottlenecks.
  5. Review the “Time Model Statistics” section to focus on the areas consuming the most database time.
  6. Consider the “Instance Efficiency Statistics” section to analyze buffer cache or I/O-related bottlenecks.

4. What actions can I take to improve database performance based on an AWR report?

Based on an AWR report, you can take the following actions to improve database performance:

  1. Tune poorly performing SQL statements by optimizing their execution plans.
  2. Identify and resolve resource contention issues by adjusting database configuration parameters.
  3. Optimize database memory components such as the buffer cache and shared pool.
  4. Monitor and tune I/O-related aspects, including tablespaces and disk usage.
  5. Consider upgrading hardware or increasing system resources if the AWR report consistently reveals resource deficiencies.
  6. Implement proper indexing strategies to enhance query performance.

5. Can I automate the generation of AWR reports in Oracle 11g?

Yes, you can automate the generation of AWR reports in Oracle 11g using the DBMS_WORKLOAD_REPOSITORY package. By creating and scheduling database jobs, you can generate AWR reports at regular intervals. This allows you to capture performance data continuously and compare reports over time.

6. Are there any additional tools available for analyzing AWR reports in Oracle 11g?

Yes, Oracle provides additional tools for analyzing AWR reports in Oracle 11g. Some notable tools include Oracle Enterprise Manager, SQL Developer, and third-party tools like Spotlight on Oracle. These tools offer graphical interfaces, advanced metrics, and additional features that can simplify AWR analysis and provide more comprehensive performance insights.

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