What is the difference between an AWR report and an ADDM report?

The data in the snapshot interval is analyzed by ADDM. ADDM compares the difference between snapshots. By default, AWR generates snapshots of performance data once every hour.

What is AWR and ADDM reports?

The Automatic Database Diagnostic Monitor (ADDM) analyzes data in the Automatic Workload Repository (AWR) to identify potential performance bottlenecks. For each of the identified issues it locates the root cause and provides recommendations for correcting the problem.

What is ADDM report in Oracle?

The Automatic Database Diagnostic Monitor (ADDM) is a self-diagnostic engine built into Oracle Database. ADDM examines and analyzes data captured in the Automatic Workload Repository (AWR) to determine possible performance problems in Oracle Database. ADDM uses the DB time statistic to identify performance problems.

What is AWR ADDM ash?

ADDM : automatic database diagnostic monitor analyzes data in the Automatic Workload Repository (AWR) to identify potential performance bottlenecks. and we use it for the following cases : CPU bottlenecks. Undersized memory structures. I/O capacity issues.

What is the use of AWR ADDM ash?

AWR: Automatic Workload Repository gathers, processes and maintains performance stats used for problem detection and self-tuning the databases. ASH: ASH is an integral part of the Oracle Database self-management framework and is extremely useful for diagnosing performance problems.

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.

How do you read AWR reports?

How do I create an ADDM report?

Alternatively, an ADDM report can be generated from SQL*Plus using the addmrpt. sql script located in the $ORACLE_HOME/rdbms/admin directory. When run, the script lists all available snapshots and prompts the user to enter the start and end snapshot along with the report name.

How do I read an ash report?

To run ASH reports:

1. On the Performance page, under Average Active Sessions, click Run ASH Report.
2. Enter the date and time for the start and end of the time period when the transient performance problem occurred.
3. Click Generate Report.
4. Optionally, click Save to File to save the report in HTML format for future analysis.

How do you analyze AWR report for performance issues?

Analysis AWR Report

1. DB Time(s): Sessions elapsed time in the database.
2. DB CPU(s): Sessions elapsed time in the CPU.
3. Redo Size: Redo size ( byte ) between two snapshot.
4. Logical Reads: Logical read count in the database.
5. Block Changes: Block changes count between two snapshot.

What do AWR reports look for?

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 is the difference between ADDM and AWR?

ADDM (Automatic Database Diagnostic Monitoring) Report: Automatic Database Diagnostic Monitoring Report analyzes the AWR data on a regular basis, to give you overview of the root cause of the problem which is affecting your database’s performance.

What’s the difference between AWR and automatic workload repository?

AWR (Automatic Workload repository) Report: Automatic Workload Repository gathers, processes and maintains performance stats used for problem detection and self-tuning the databases. This collective information can be displayed as views and reports (HTML/text) to better show the current database performance status for further analysis.

What are the different types of AWR reports?

Different types of AWR Reports for different purposes: Automatic Database Diagnostic Monitoring Report analyzes the AWR data on a regular basis, to give you overview of the root cause of the problem which is affecting your database’s performance.

How does ADDM analyze snapshots taken by AWR?

ADDM analyze snapshots taken by AWR. Automatic database diagnostic monitoring is enabled by default and is controlled by the CONTROL_MANAGEMENT_PACK_ACCESS and the STATISTICS_LEVEL initialization parameters.