IOUG at Coors Field ASH and AWR in EM12c!

Copyright © 2014 Oracle and/or its affiliates. All rights reserved. | Oracle Confidential

Enterprise Manager 12c Performance FeaturesEnterprise Manager 12c, Release 4

Kellyn Pot’VinConsulting Member of Enterprise Manager Technical TeamStrategic Customer ProgramAugust 19th, 2014

Copyright © 2014 Oracle and/or its affiliates. All rights reserved. |

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Program Agenda

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AWR/ASH in EM12c

ASH Analytics

ADDM Comparisons

The AWR Warehouse

The Features Everyone Misses


Program Agenda with Highlight

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ASH Analytics

ADDM Comparisons

The AWR Warehouse



Review of “DB Time”

• It is the accurate measure and term used for Oracle performance throughput.

• DB Time is total of all time spent on database calls by foreground processing for active sessions.

• It is comprised of all CPU Time, IO Time and non-idle wait time.


“ASH Math”

• One out of every ten samples is saved to AWR

• Estimate of DB Time based off of ASH Samples residing in AWR

• Count of ASH Samples are basis for DB Time for the Time Interval in question.

• Data is grouped by over 70+ performance dimensions to ensure the most accurate data using samples.


“Tune for Time or You’re Just Wasting Time”


When You Don’t Use ASH or AWR


AWR is EVERYWHERE in EM12c


SQL Monitor


SQL Details and Session Details

In Top Activity or ASH Analytics



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Top Activity


ASH Analytics


Choose Timeline of Data

• Hour• Day• Week• Month


Calendar Time Slot

• Choose dates• Isolate Time


Custom

• Choose Start Date and Time• Choose End Date and Time• Scroll to Area within Timeline that is of Interest


Wait Events

• Comfortable Interface• Common Legend


Flexible Data Display

• SQL ID is default

• Broaden view to display any dimension available in drop down.


Second Table Display

Just as flexible and almost as many options as first table.

Can be used in conjunction to the first to give extended view of waits and session data.


Load Map


What is a Load Map?

• Visual way to display data.• Can support multiple

dimensions.• Can offer a way to explain

waits, issues that other graphs can’t.


Changing ASH Analytics Data Views

• Simple Combination Views

• Numerous Combinations


Advanced Load Map Views

• You Control the Combination

• Two or Three Dimensions

• Advanced Filtering Options


Filtering


Summary

• The Future of Top Activity

• Multiple Dimensions and View Options

• Advanced Filtering

• Load Map View for Extended Display of Data



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ASH Analytics

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How Often do We Ask, What Changed?

• It ran fine last week, now it isn’t!

• ETL loads have changed, but no one has released any new code!

• The DBA says there hasn’t been any parameter changes to this database, but I’m sure there have been.

Compare ADDM Resolution


What is Compare ADDM?

• Uses Two AWR snapshots

• Creates Report that-

• Compares SQL that is common and different.

• SGA changes

• IO/CPU bound issues

• Parameter Changes


A Comparison ADDM Report…

• Report Includes Following:• Clear Demonstration of impact of change.• Recommendations to address issue.• Identifies causes behind change, (with limitations.)• Lists Regressed SQL, too!

Tip: If Installing to database for first time, (simple installation, nothing to concern about, just pkg to fulfill views) you must have preferred credentials SET of install will fail!


Creating a Report

• Choose focus period

• Choose to compare to an Offset, Baseline or Custom


2-3pm, Compared on the 12th vs. the 13th

• Familiar interface with visual wait event comparisons.

• Average # of sessions during each period are displayed.


Detailed Report

High level data, highlight for analysis and recommendations


Regression SQLAny performance degradation is noted with the down arrow icon:


Top Segments Causing IO Waits

• High Level data• Click on “Show Hot Object Breakdown” to see more detail.


Resource Comparisons• Comparisons of Memory, CPU, IO and Interconnect.

• Memory Is there Virtual paging?

- Memory Base Period

- Memory Comparison Period


Dashboard Provided for CPU, Memory, IO and Interconnect• Is something OTHER than Oracle the cause?


IO Bound Dashboard• Base vs. comparison period• Temp reads/writes specified• Single block read latency


Summary• Familiar Interface design

• Compare any snapshots within AWR, even if times are not same.

• Provides clear, concise information about differences, degradation, improvements, along with recommendations.

• Easy access to other performance data and reports.



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The AWR Warehouse



AWR Warehouse in EM12c• Automatic Workload Repository

(AWR) is the de facto performance repository for Oracle databases since 10g

• Default retention period of 8 days prevents diagnosis of long term performance problems (“Compare performance during this quarter’s books close with last quarter’s”)

• Increasing AWR retention period increases overhead and cost in critical production environments

CRMFinance Supply Chain

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AWR Warehouse - Architecture• Central warehouse configured for

long term AWR data retention• Historical and ongoing AWR

snapshots collected from databases enabled for AWR warehouse• ETL jobs moves snapshots from

source databases into AWR warehouse• Retention period configurable for

weeks, months, years or forever (default)


AWR Warehouse Features• Warehouse dashboard tracking

ETL jobs• All AWR features available on long

term AWR data• Performance page• AWR report• ASH analytics• Compare Period ADDM• Compare Period Report

• Integrated seamlessly into EM UI• Zero runtime overhead on source

Production databases


Requirements

• AWR Warehouse Repository -11.2.0.4 or higher.

• Preferred Credentials set up for all targets involved.

• Discover the database you will use for your repository in the EM12c

• Pre-discover any source database before able to add.

• For a RAC target or AWR Warehouse, ensure you’ve set up a shared location for the ETL load files.

Copyright © 2014 Oracle and/or its affiliates. All rights reserved. | Oracle Confidential – Internal/Restricted/Highly Restricted 48

AWR ETL Jobs

DBMS Job on Source Database to directory

Job in EM Job Service that pulls file from Source Target and then pushes to AWR Warehouse Target Directory Final DBMS Job Inserts data

into AWR Warehouse

All data identified by OLD/NEW DBID and with the EM_ID, (CAW_DBID_MAPPING in AWR WAREHOUSE)

Source Target

Enterprise Manager

AWR Warehouse


AWR Warehouse DBSNMP Object of Importance, (OI)

CAW_DBID_MAPPING : Used to map all data between Enterprise Manager, AWR Warehouse and Database Identifiers.


Accessing the AWR Warehouse

Targets Databases

Performance AWR Warehouse


AWR Warehouse Console Interface


AWR Warehouse ConfigurationsAlong with AWR Warehouse Basics-

• Configuration Status

• Version of Repository Database

• Host Information

• Connect Info, (SID/Service Name, Port)

• Space Usage, Upload Interval and Retention


Working with AWR Source Databases in Repository

• Highlight database from list, (clicking on target name will take you to performance home page for target.)

• Run basic reports, view ASH Analytics or perform ADDM Comparisons.

• Also Add databases from the options.

Copyright © 2014 Oracle and/or its affiliates. All rights reserved. | Oracle Confidential – Internal/Restricted/Highly Restricted 54

What Can I do with the AWR Warehouse?

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CPU Usage Issues

“Nothing’s changed in months…”


Using the AWR Warehouse for Capacity Planning

“Do we really need more partitioning and pruning? Our disk usage hasn’t increased this last year….”


Querying the AWR Warehouse Tips

Update Scripts with DBID identified to filter.

Join:

• CAW_DBID_MAPPING on OLD_DBID/NEW_DBID=DBID

• CAW_DBID_MAPPING on TARGET_NAME=TARGET_NAME


How Current AWR Queries Change

from dba_hist_sys_time_model stm, dba_hist_snapshot s, gv$parameter p, dbsnmp.caw_dbid_mapping m

where stm.stat_name in ('DB CPU','background cpu time')

and LOWER(m.target_name)= '&dbname'

and s.dbid= m.new_dbid and s.snap_id = stm.snap_id

and s.dbid = stm.dbid and s.instance_number = stm.instance_number

and p.name = 'cpu_count' and p.inst_id = s.instance_number)


Interested in More Scripting?



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ASH Analytics

ADDM Comparisons

The AWR Warehouse



Search SQL Interface• Choose AWR Snapshots, (change Time Period), AWR Baselines and put

SQL_ID


Click on Search

• SQL_ID link for SQL Details• Split up by tabs for Cursor, AWR, Baselines and SQL Tuning Sets• Plan Hash Value• Elapsed Time


AWR Data


Snapshot IDs• Click on Snapshot ID and gather valuable data on resource usage during

snapshot time or choose to view report.


SQL Monitor, Exadata and Offloading

• Drill down to specific statement within SQL Monitor will display offload efficiency per statement.


Want to Learn More?

Oracle Screenwatch: https://www.youtube.com/watch?v=StydMitHtuI

DBAKevlar Blog Posts:

http://dbakevlar.com/2014/06/awr-warehouse-in-em12c-rel-4/

http://dbakevlar.com/2014/06/awr-warehouse-in-em12c-rel-4-part-ii/

Scripts: http://dbakevlar.com/scripts/

https://www.youtube.com/watch?v=StydMitHtuI

https://www.youtube.com/watch?v=StydMitHtuI






http://dbakevlar.com/scripts/

http://dbakevlar.com/scripts/


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Date post:	12-Jun-2015
Category:	Technology
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IOUG at Coors Field ASH and AWR in EM12c!

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