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How do you read AWR report for performance issues?
Reading the AWR Report The main sections in an AWR report include: Report Summary: This gives an overall summary of the instance during the snapshot period, and it contains important aggregate summary information. Cache Sizes (end): This shows the size of each SGA region after AMM has changed them.
What do we check in AWR report?
The AWR provides a set of tables into which snapshots of system statistics are stored. Generally these snapshots are taken on an hourly basis and include wait interface statistics, top SQL, memory, and I/O information that is cumulative in nature up to the time of the capture.
How do I compare AWR reports?
To generate an AWR Compare Periods report on the local database instance using the command-line interface:
- At the SQL prompt, enter: @$ORACLE_HOME/rdbms/admin/awrddrpt.sql.
- Specify whether you want an HTML or a text report: Enter value for report_type: html.
How do I check CPU usage in AWR?
To check that, look at OS CPU usage statistics either directly in the OS (using sar or other utility available on the host OS) or by looking at IDLE/(IDLE+BUSY) from the Operating System statistics section and comparing it to the number above.
What is AWR report in Oracle?
Automatic Workload Repository report or AWR report collects, processes, and maintains performance statistics for problem detection and self-tuning purposes. This gathered data is stored both in memory and in the database and is displayed in both reports and views.
What is AWR baseline in Oracle?
Internally, an AWR baselines is a range of snapshots that can be used to compare to other pairs of snapshots. The Oracle database server will exempt the snapshots assigned to a specific baseline from the automated purge routine.
What is CPU time in AWR report?
“CPU time” meaning that your statement was used CPU for N seconds “Elapsed Time” mean all time for your statement, because you can spent it for waiting your HDD or locks or something else. It’s all should be in AWR report if you tracing with maximum level.
How do I know how many cores I have in Oracle?
select CPU_CORE_COUNT_CURRENT from V$LICENSE; Repeat these steps for every Oracle Database instance and then sum up the results to receive the number of CPU cores for the entire deployment.
Where is Oracle AWR report?
The AWR report is displayed in the Database Manager object of the Administrator Console in a section labeled Latest Oracle AWR Report.
What is the AWR report in Oracle?
It is used for historical analysis of performance. AWR complements, but doesnot replace real-time monitoring. Once AWR Report is generated in Oracle, the next task is to analyze it. By going through the AWR Report we can easily solve issues like slow database, high wait events, slow query and many more issues.
How do I use AWR viewer for managed database?
You can use AWR Viewer to view and analyze AWR data for a Managed Database and use it as a central repository to import, analyze, and compare AWR data from other databases. The Automatic Workload Repository (AWR) is a built-in repository in the Oracle Database, which collects, processes, and maintains performance statistics of the database.
What are some tips before getting an AWR report?
General Tips before getting an AWR Report. 1. Collect Multiple AWR Reports: It’s always suggested to have two AWR Reports, one for good time (when database was performing well), second when performance is poor. This way we can easily compare good and bad report to find out the culprit. 2.
How to view AWR data for a RAC database?
AWR Viewer is only available for single instance Oracle Database Enterprise Edition version 12.2 and later. Also, the status of the database must be up for the AWR Viewer button to be enabled. If you want to view and analyze AWR data for a RAC database, see the information given in the following bullet point.