Em12c performance tuning outside the box

K E L L Y N P O T ’ V I N
S R . T E C H N I C A L C O N S U L T A N T
EM12c Performance Diagnosis
and Tuning Outside the Box

Kellyn Pot’Vin
 Westminster, Colorado
 Oracle ACE Director, Sr. Technical Specialist at
Enkitec
 Specialize in performance and management of large
enterprise environments.
 Board of directors for RMOUG, Director of Training
Days and Database Track Lead for KSCOPE 2013
 Blog: DBAKevlar.com
 Twitter: @DBAKevlar

Performance Diagnostics in EM12c
 Simple access to performance, resource usage and
demands.
 Data collection to investigate performance issues-
current, recent and historical.
 Capacity planning.
 Have the real answer, not assumptions.

Presentation Agenda
 Performance Out of the Box with EM12c
 Top Activity
 SQL Monitor
 ASH Analytics
 Real-time ADDM
 Compare ADDM

Tools at your Disposal
 Requires the
Diagnostics
Pack

Top Activity, “The Grid”
 Graphical display of performance usage.
 15 second refresh, manual refresh or historical.

When to Worry
 Out of the Ordinary Activity, (KNOW YOUR DB!)
 Colors outside of green and [some] blue.
 Large amounts of blue, (high IO)
 Remember that pink, (unknown) red,
(concurrency/application) tan, (network) and
orange, (commit) in the grid should be investigated.
 Brown or black? Run for the hills! (JK)

Here’s our spike, which waits?
 Commonly, focus on pink,
orange, red and brown for
issues.
 Network and queuing do
have opportunities for
tuning, as well.
 Green and blue are expected,
but also part of problems
when over utilized.

We’re in the Red, (Orange, too!)
 Inspect
High %
use.
 Note that
the update
and
execution
may be
impacting
each other.

Next?
 Two sessions are executing
 Option to run an AWR or ASH report, (right hand side)

The Icing on the Cake
 Duh, add some memory to the EM12c box! 

SQL Monitor for Performance
• Elapsed Time
• SQL_ID, Beginning SQL Text.
• Parallel, Waits and Execution Time

Digging in
• Choose your session, SQL_ID or SQL_Text
• Shows active, completed sessions for amount of time chosen.
• Shows high level wait events, dbtime, IO usage and duration.

Digging Down
By SQL_ID, we can inspect:
• Duration
• DB Time
• PL/SQL Java time
• Wait Activity
• Buffer Gets
• IO Requests and IO Bytes
• If Exadata, Offload Efficiency

Monitoring Procedural Call
 All SQL_ID’s called will show, along with
duration so it’s simple to pinpoint trouble
statements.

SQL Details
• Note that the SQL Statement, along with elapsed time is
shown.
• Data sources from Top Activity, not AWR data.

And More Detail
 Session info, wait info, cursors and stats.

Added Data
 Along with the main stats-
 Activity information on the statement.
 The execution plan
 If there is a SQL Plan or outline in place.
 If there have been any tuning advisors run against the
statement
 And a direct link to SQL Monitoring

How to Use SQL Monitoring
 Active Monitoring of database processing.
 Investigation of performance.
 Save off reports, which provide a graphical image of
performance differing from Top Activity or ASH
Analytics.
 Distinct diagnosis at a session or statement level.

ASH Analytics
 Future of Top Activity
 Package installation to database.
 Always on, non-impact of Top Activity performance
data gathering.
 More defined, more accurate.
 Historical data enhanced over Top Activity historical
views.

Pick Your View
Ability to choose timelines by:
Hour Day
Week Month
Calendar Custom

Custom Review Pane
• You can choose to change the overview pane to display data for any
amount of time.
• Just click on the pane and drag it to the area you are interested in or
extend it to cover the areas you are interested to investigate.
• Choose your filters or view all data and you are ready to go!

Familiar Interface
 Similar to Top Activity when in “Activity”
mode.

Pick Your Poison
 View data very similar to the SQL and Session data
in Top Activity.
 All data is sourced by AWR data and dependent on
samples and AWR retention/interval info in the
respository.

Activity Details
 Activity shows wait detail over time.
 Processes, including parallel sessions involved
during shaded time.
 Option to run AWR or ASH report.

The Rest of the Story
 For standard SQL- Plan, Plan Control and Tuning
History is shown under individual tabs.
 SQL Monitor is minimized access to the SQL
Monitor view.

Load Map
New Visual Way of Showing Data, Multiple
Ways!

Data Break Down
 Display offers incredible diversity in wait, resource
usage and other critical event choices.

ASH Analytics – When to Use It
 Need the more defined ASH data for EM diagnostics.
 Want a second way to present data to less “DBA”
centric groups, (load map)
 Database level OR session/statement level
performance diagnosis.
 Dig down deep, present data in numerous formats to
get the most complete picture of a complex issue.
 Can be used for Real-time or historical analysis.

Real-Time ADDM
 Yes, it requires a PL/SQL installation for the view
data.
 Uses ADDM data for the source.
 Always on, low to no impact.
 Normal Mode or Emergency Mode when Emergency
Monitoring is required.

On Your Mark, Get Set…
 This is a recorded ADDM session, beginning from
the time you click “Start”.

In Progress Data
 Ability to stop
and restart.
 Findings
gathered during
progress.
 Check progress
notifies of any
issues.

Finished!
 Once finished, verify no failures/errors occurred in
the collection.
 Use the tabs to investigate findings, activity, hang
data and statistics.
 The number of findings are shown.

The Findings
 Example shows low priority SQL statements using
significant db time, but not other issues at this time.
 If any issues are found that are high priority, will be
listed in red and details below the main pane, (low,
medium, high priority levels.)

Activity Tab
 Activity Data, but sourced from ADDM.
 Similar output to Top Activity and ASH Analytics.

Wait Details
• By highlighting a wait link on the right, you can detail down to the actual wait
information for that wait event.

Hanging out
 If a database hang situation occurred and the real-
time ADDM was used to diagnose, then the HANG
DATA tab will show any diagnostic data it has
collected during the collection.
 Statistics Data:

Last but not Least…
 Initialization Parameter data for the database
instance.
 Any undocumented of non-recommended parameter
settings will be identified and listed in the findings
section.

Compare Period ADDM
 How is it different from Real-Time ADDM?
 Ability to compare TWO snapshots in time, side by side of
ADDM data.
 Compares ADDM snapshots against each other, (dependent on
snapshot intervals and retention.)
 All comparisons can be saved off or mailed from the console,
(mailed through EM12c settings)

Comparison Activity
• Clear comparison from previous day, same time to see performance issue vs.
the right hand side snapshot.
• Commonality comparison of the SQL for snapshots being compared.
• Note the concurrency, commits and increased application waits.

It’s all in the Details
 First tab shows any configuration differences
between the two snapshots and what the
configuration parameter is.

Findings Summary Detail
 Shows comparison increases or decreases in waits.
 Lists the percentage of change between each period
compared.
 Upon highlighting, details data regarding the
increase or decrease.

SQL Changes
 We can dig down into each of the SQL Statements
found to be the highest impacts to the system and
diagnose further.

Finding Detail Descriptions
 As shown above, the wait on Checkpoints to Tablespace are
describe below once you highlight the section in the findings
tab.
 And for RAC, some waits can be broken down by instance.

Resource Usage: CPU
 CPU Usage is viewable
by instance and total
usage.
 If no CPU bound wait
issues were seen, its
stated by comparison
snapshot.

Resource Usage: Memory
• If you note, Memory has a warning alert by the tab to point you to it after the
comparison is completed.
• The base and comparison is in red, meaning that Virtual paging was an issue
in both snapshots.
• Data is separated by instance in RAC, showing clear usage for better
diagnostics.

Resource Usage: IO
 I/O is separated by Throughput and Single block
read latency.
 Again, if there was an issue, a warning would be on
the IO tab and the Base and Comparison would show
in red instead of green.

Resource Usage: Interconnect
 As this is RAC, note that we also have an
interconnect tab with data on the speed and
performance.
 Total vs. rate on throughput is viewed through a
radio button choice.

So What Changed?
 The graphs show us where we need to focus:

How to Use the Comparison ADDM
 Excellent to diagnose “what has changed”.
 “Just the Facts” information on a comparison of
time.
 Dependent upon retention time settings and
intervals for AWR.
 Historical data, can be set by date, custom, by
previous snapshot.
 Will move to next snapshot window if mid-snapshot
time span is chosen.

EM12c blogs-
Leighton Nelson- http://blogs.griddba.com/
Rob Zoeteweij-http://oemgc.files.wordpress.com/
Gokhan Atil- http://www.gokhanatil.com/
Martin Bach- http://martincarstenbach.wordpress.com
Niall Litchfield- http://orawin.info/blog/
Info for Me!
Company Website: www.enkitec.com
Twitter: @DBAKevlar
RMOUG: www.rmoug.org
Linkedin: Kellyn Potvin and/or Rocky Mountain Oracle User Group
Email: dbakevlar@gmail.com or kpotvin@enkitec.com or
TrainingdaysDir@rmoug.org
Blog: https://dbakevlar.com
Reference

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Em12c performance tuning outside the box

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