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What is AWR? Automatic Workload Repository data collection and performance analysis
Automatic Workload Repository (AWR) is a crucial component of Oracle Database that collects and stores performance-related information over selected periods of time. It provides a wealth of data that assists database administrators and performance analysts in identifying and resolving performance issues.
AWR collects data from various sources, including statistics, wait events, time model statistics, and system and session statistics. This data is captured at regular intervals within a predefined time window, typically every 60 minutes, and stored in the AWR repository.
The AWR data collection process is automated and doesn’t require manual intervention. It operates under the hood without impacting database performance, ensuring minimal overhead. The collected data is then analyzed and used to create reports that offer insights into the database’s overall performance and reveal areas that require attention.
One of the key features of AWR is the ability to compare two AWR reports from different time periods. By analyzing the differences in the reports, administrators can assess the impact of configuration changes, workload changes, or database performance tuning efforts.
The AWR reports provide a comprehensive view of database performance, including information such as top SQL queries, wait events, system activity, and various performance metrics. These reports can be generated using Oracle Enterprise Manager (OEM) or the command-line interface.
Benefits of AWR
- Performance Tuning: AWR is a valuable tool for identifying performance bottlenecks, monitoring database performance over time, and making informed decisions for optimization.
- Root Cause Analysis: By examining AWR reports, system administrators can pinpoint the root causes of performance issues and address them effectively.
- Capacity Planning: AWR helps in estimating future growth requirements by analyzing historical performance data and predicting future resource needs.
- Change Impact Assessment: AWR reports enable administrators to assess how system changes, such as upgrades or configuration modifications, affect database performance.
In conclusion, AWR is an indispensable tool in Oracle Database, offering comprehensive performance analysis and monitoring capabilities. It provides actionable insights that help optimize database performance, mitigate performance issues, and ensure efficient resource utilization. By leveraging AWR, administrators can proactively maintain a healthy and high-performing database environment.
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