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Results for ADDM


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Database Performance Tuning Guide, 12c Release 1 (12.1)

Automatic Performance Diagnostics

ADDM AnalysisAn ADDM analysis can be performed on a pair of AWR snapshots and a set of instances from the same … ADDM has three analysis modes: Database In Database mode, ADDM analyzes all instances of the database … . Instance In Instance mode, ADDM analyzes a particular instance of the database. Partial In Partial … mode,

Database Concepts, 12c Release 1 (12.1)

Glossary

ADDMAutomatic Database Diagnostic Monitor. An Oracle Database infrastructure that enables a database to diagnose its own performance and determine how identified problems could be resolved.

Database Performance Tuning Guide, 12c Release 1 (12.1)

Automatic Performance Diagnostics

Real-Time ADDM AnalysisIntroduced in Oracle Enterprise Manager Cloud Control 12 c, Real-Time ADDM helps you to analyze and … database. Real-Time ADDM runs through a set of predefined criteria to analyze the current performance … of the database. After analyzing the problem, Real-Time ADDM helps you to resolve the identified … to restart the database.

Database Performance Tuning Guide, 12c Release 1 (12.1)

Automatic Performance Diagnostics

Displaying an ADDM ReportTo display a text report of an executed ADDM task, use the DBMS_ADDM. GET_REPORT function … the ADDM task specified by its task name using the tname variable: SET LONG 1000000 PAGESIZE 0 … to fit line size of 80. For information about reviewing the ADDM analysis results in an ADDM report, see \" ADDM

Database Performance Tuning Guide, 12c Release 1 (12.1)

Automatic Performance Diagnostics

ADDM Analysis ResultsReal-Time ADDM Trigger Controls To ensure that the automatic triggers do not consume too many … system resources and overwhelm the system, Real-Time ADDM employs the following controls: Duration … between reports If a Real-Time ADDM report was created in the past 5 minutes by the automatic trigger … instance. For Oracle RAC, only

Database Performance Tuning Guide, 12c Release 1 (12.1)

Automatic Performance Diagnostics

Setting Up ADDMto NONE disables ADDM. The STATISTICS_LEVEL parameter should be set to the TYPICAL or ALL to enable … BASIC disables many Oracle Database features, including ADDM, and is strongly discouraged. See Also … STATISTICS_LEVEL initialization parameters ADDM analysis of I/O performance partially depends on a single … subsequent ADDM

Database Performance Tuning Guide, 12c Release 1 (12.1)

Automatic Performance Diagnostics

Views with ADDM InformationTypically, you should view output and information from ADDM using Cloud Control or ADDM reports … . However, you can display ADDM information through the DBA_ADVISOR views. This group of views includes … displays the ADDM findings discovered by all advisors. Each ADDM finding is displayed with an

Database SQL Tuning Guide, 12c Release 1 (12.1)

Glossary

ADDMSee Automatic Database Diagnostic Monitor (ADDM).

Database Performance Tuning Guide, 12c Release 1 (12.1)

Automatic Performance Diagnostics

Running ADDM in Instance ModeTo analyze a particular instance of the database, you can run ADDM in Instance mode. To run ADDM in … ADDM task in instance analysis mode, and executes it to diagnose the performance of instance number 1 … ADDM for 7PM to 9PM'; DBMS_ADDM.ANALYZE_INST(:tname, 137, 145, 1); END; /

Database Performance Tuning Guide, 12c Release 1 (12.1)

Automatic Performance Diagnostics

Running ADDM in Partial ModeTo analyze a subset of all database instances, you can run ADDM in Partial mode. To run ADDM in … ADDM task in partial analysis mode, and executes it to diagnose the performance of instance numbers 1 … :tname:= 'my ADDM for 7PM to 9PM'; DBMS_ADDM.ANALYZE_PARTIAL(:tname, '1,2,4', 137, 145); END; /

Database Performance Tuning Guide, 12c Release 1 (12.1)

Automatic Performance Diagnostics

Reviewing ADDM Analysis Results: ExampleConsider the following section of an ADDM report in Example 7-1. Example 7-1 Example ADDM Report … sample statements. When a specific problem has multiple causes, ADDM may report multiple problem and … findings can exceed 100% of DB time. For example, if a system performs many reads, then ADDM might … . When appropriate,

Database Performance Tuning Guide, 12c Release 1 (12.1)

Automatic Performance Diagnostics

Running ADDM in Database ModeFor Oracle RAC configurations, you can run ADDM in Database mode to analyze all instances of the … databases. For single-instance configurations, you can still run ADDM in Database mode; ADDM will … behave as if running in Instance mode. To run ADDM in Database mode, use the DBMS_ADDM. ANALYZE_DB … identifier

Database 2 Day DBA, 12c Release 1 (12.1)

Responding to ADDM Performance Findings

10.2.2 Responding to ADDM Performance FindingsYou can act upon the recommendations that accompany ADDM performance findings. To respond to ADDM … performance findings: In the ADDM Tasks table on the ADDM tab of the Performance Hub page, click the … Diagnostic Monitor (ADDM) page appears. Description of the illustration GUID-B940A31B-FFED-44D0-A3E3

Database 2 Day DBA, 12c Release 1 (12.1)

Diagnosing Performance Problems Using ADDM

10.2 Diagnosing Performance Problems Using ADDM, these problems are brought to your attention by ADDM, which analyzes data for different time periods … . This section contains the following topics: Viewing a Summary of ADDM Performance Findings … Responding to ADDM Performance Findings Viewing a Summary of Real-Time ADDM Findings Responding to Real … -Time

Database 2 Day DBA, 12c Release 1 (12.1)

Responding to Current ADDM Findings

10.2.6 Responding to Current ADDM FindingsYou can respond to the current findings on the Current ADDM Findings tab. To respond to current

Database Performance Tuning Guide, 12c Release 1 (12.1)

Automatic Performance Diagnostics

Using ADDM with Oracle Real Application ClustersIf you are using Oracle RAC, then run ADDM in Database analysis mode to analyze the throughput … performance of all instances of the database. In Database mode, ADDM considers DB time as the sum of the … + Real Application Clusters Guide for information about using ADDM with Oracle RAC

Database Performance Tuning Guide, 12c Release 1 (12.1)

Automatic Performance Diagnostics

Diagnosing Database Performance Problems with ADDMTo diagnose database performance problems, first review the ADDM analysis results that are … can run ADDM manually as described in this section. ADDM can analyze any two AWR snapshots (on the … same database), as long as both snapshots are still stored in AWR (have not been purged). ADDM can only … ending snapshot.

Database 2 Day DBA, 12c Release 1 (12.1)

Viewing a Summary of ADDM Performance Findings

10.2.1 Viewing a Summary of ADDM Performance FindingsADDM analysis results consist of a description of each finding and a recommended action. You can … view a summary of findings and their impacts on the system. To view a summary of ADDM performance … to indicate the selected time period. Click the ADDM tab. The ADDM tasks for the selected time … period appear in

Database 2 Day DBA, 12c Release 1 (12.1)

Responding to Real-Time ADDM Findings

10.2.4 Responding to Real-Time ADDM FindingsYou can view the findings in a Real-Time ADDM report. To respond to Real-Time ADDM performance … findings: To view a particular report in the Real-Time ADDM Reports table, click the link for the report … -Time ADDM Report page appears. Description of the illustration GUID-B2B5E6D3-2274-4690-80E6

Database 2 Day DBA, 12c Release 1 (12.1)

Viewing a Summary of Current ADDM Findings

10.2.5 Viewing a Summary of Current ADDM FindingsCurrent ADDM Findings analysis results consist of a description of each current finding and a … recommended action. You can view a summary of current ADDM findings and their impacts on the system. To … view Current ADDM Findings: In EM Express, from the Performance menu, select Performance Hub. The … field, select Real-Time: Last