DOAG Conference 2017 AWR and ASH for Standard Edition · PDF fileAutomatic Workload Repository Use Excel to analyze Pivot Charts allow powerful analyzing / filtering. Experts for database

Experts for database solutions.

DOAG Conference 2017

AWR and ASH for Standard Edition

Marco Mischke, 22.11.2017


About me

Oracle DBA since 2000 and Version 7.3.4

Certified Professional 10g, 11g

RAC / Cluster Certified Expert 10g, 11g, 12c

Oracle ACE

@DBAMarco

dbamarco.wordpress.com


Facts and FiguresRobotron Datenbank-Software GmbH

Year of formation 1990

Legal form GmbH (Limited liability company, 8 associates)

Number of employees 433 (Status 09/2017)

Capital stock 2.4 million EUR

Turnover 2017 43.8 million EUR

Technology-Partner

ISO 9001 certified

Headquarters

Congress and Training Center


The Robotron Company Group

Czech Rep.: Robotron Database Solutions s.r.o.

Switzerland: Robotron Schweiz GmbH

Austria: Robotron Austria GmbH

Russia: Robotron Rus GmbH

Germany: SASKIA® Informations-Systeme GmbH


The Range of Services of Robotronwith branch-specific Expertise

Methodical and technological responsibility

Comprehensive expertise of industry-specific business processes


AWR and ASH for Standard Edition

AWR and ASH for Standard Edition?

Simply not available.


Questions?

Marco MischkeLead Consultant Oracle Support

@DBAMarco

Phone: +49 351 [email protected]

www.robotron.de



Agenda

Motivation

Automatic Workload Repository

Active Session History

All the rest


Motivation

The perfect world – from an Oracle Sales perspective

– The fully equiped Audi RS6 of the database

• Enterprise Edition

• Lots of licensed Options, especially Diagnostic & Tuning

Pictures: audi.de


Motivation





In contrast – the real world from our perspective

Pictures: audi.de


Motivation






– The Audi A4 base model, with some extras maybe


• No or few options like Partitioning

Pictures: audi.de


Motivation






– The Audi A4 base model, with some extras maybe


• No or few options like Partitioning

– The Audi A1 for the masses

• Standard Edition

• There are no options at all (beside RAC)

Pictures: audi.de


Motivation

What I use most with Diagnostic & Tuning

– What‘s going on currently?

• Top Activity

• Performance Overview

• ASH

– What was the problem with the database some time ago?

• Historic view of Top Activity

• Historic view of Performance

Basically the same data


Agenda

Motivation



All the rest



What it is

– Installed in every database automatically

– Periodic snapshots of performance views

– Stored in a set of tables

– Facility to generate reports for user-defined intervals

– Datasource for Advisors

Where it came from

– utlbstat / utlestat

– Statspack

What it needs

– Money $$$ - Enterprise Edition + Diagnostic Pack License



What we have with Standard Edition / Enterprise Edition without Diagnostic Pack

– Statspack is still there

– Comes for free

– Lacks some information that AWR has (new metrics, service statistics, ASH, ADDM, …)

What to do to get it

– Install: ?/rdbms/admin/spcreate

– Automatic snapshot creation: ?/rdbms/admin/spauto

– Manual purging: ?/rdbms/sppurge

What it cannot do

– RAC / HTML formatted / Compare reports

– Advisors



Recommendation: Install Statspack before the race starts

– Create job to create periodic snapshots

– Set snapshot level to 7 SQL Plan and Segment statistics

– Maybe modify thresholds for gathering information

– Create automatic purge job based on „sppurge“

Benefits

– Information is there once a problem occurs

– Investigation can start right away

– No need to prepare special monitoring and wait for the problem to re-occur



Comparing AWR and Statspack Reports, what‘s inside that the other lacks

– awrrpt.sql spreport.sqlForeground Wait Class Top Process MemoryService StatisticsKey Instance Activity StatsIOStats by Filetype

– awrsqrpt.sql sprepsql.sql



But why reports?

– They are just numbers for the specific interval

– Cannot show changes over time

Enterprise Manager can

– Show a timelime to give a rough overview (using AWR)

– Drill down to details (using ASH)

Charts are much more helpful than just numbers



Statspack – Do it yourself

– Captured values are absolute values since instance startup

– Need to get difference from one snapshot to next snapshot Tom Kyte: Analytic functions rock – they roll!

SELECT

s.snap_time,

v.value – lag(v.value) over (order by s.snap_time) realvalue

FROM

stats$snapshot s,

stats$sysstat v or any other table

WHERE …



Simple example query

selectto_char(sn.snap_time, 'dd.mm.yy hh24:mi') snap_time, s00.value - lag(s00.value) over (order by sn.snap_time) "db block gets", s01.value - lag(s01.value) over (order by sn.snap_time) "physical reads", s02.value - lag(s02.value) over (order by sn.snap_time) "consistent gets" from stats$snapshot snjoin stats$sysstat s00 on (sn.snap_id = s00.snap_id)join stats$sysstat s01 on (sn.snap_id = s01.snap_id)join stats$sysstat s02 on (sn.snap_id = s02.snap_id)where sn.snap_time between to_date('03.11.2017 10:30', 'dd.mm.yyyy hh24:mi')

and to_date('03.11.2017 14:45', 'dd.mm.yyyy hh24:mi') and s00.name = 'db block gets'and s01.name = 'physical reads' and s02.name = 'consistent gets' order by sn.snap_time



Build an APEX application

In red:the momentwhen reportqueries weredisabled inSwingBenchand physicalreads dropped



Use Excel to analyze Pivot Charts allow powerful analyzing / filtering



Build your own Reports with SQL Developer









Something happened…. Check system statistics



Something happened…. Check Tablespace I/O



Something happened…. between 08:08 and 08:23












Something different happened…. between 08:38 and 08:53












There are a lot more tables inside STATSPACK

– Check PERFSTAT schema

– Tablenames match the system views V$*** STATS$***

Just be creative


Agenda

Motivation



All the rest



What it is

– Installed in every database automatically

– Snapshot of active sessions every second

– Persisted and aggregated later on

Why it is needed

– AWR and Statspack snapshots have a good chance to miss single peaks

– Snapshot can only get what is in the cache and what exceeds thresholds

• SQLs running from 09:02 till 09:56

• SQL not using binds

– ASH will get it

What it needs

– Money $$$ - Enterprise Edition + Diagnostic Pack License



How to do it without ASH

– Just take a snapshot of (G)V$SESSION on your own

INSERT INTO my_own_ash

SELECT systimestamp, s.*

FROM v$session s

WHERE status = 'ACTIVE'

AND username is not null

AND audsid <> userenv('SESSIONID')

– Exclude your own session, it will be always „active“

– Maintain a list of timestamps when a snapshot was taken, just in case everything was idle

– Of cause it generates some overhead



How to visualize it, Enterprise Manager style

– Query the raw data

– Put it into Excel

– Create a Pivot Chart



Pivot Charts allow drill down

– Very flexible



Or, again, use SQL Developer



Or, again, build/use an APEX application



Enterprise Manager Activity Page

– Use Dominic Giles‘ „DB Time Monitor“: http://www.dominicgiles.com/dbtimeviewer.html

– Nice and sweet overview

– Can‘t drill down to sessions

– No real history

http://www.dominicgiles.com/dbtimeviewer.html



What‘s going on there?





You will hardly see it in the report

Nothing at all


Agenda

Motivation



All the rest


ASH – Snapper / Tanel Poder

Want to have a quick look?

– Use Tanel Poder‘s „Snapper“ script: http://blog.tanelpoder.com/

– „Most Advanced Oracle Troubleshooting Script on the Planet!”

– Monitor a specific session

– Monitor the whole system

– Powerful features

http://blog.tanelpoder.com/


ASH – Snapper / Tanel Poder


All the rest – SQLd360 / Mauro Pagano

https://mauro-pagano.com/category/sqld360/

Detailed statistics for a specific SQL, limited with noDiagnostic/Tuning license

https://mauro-pagano.com/category/sqld360/

Die Datenbank-Spezialisten.

weitere Informationsmöglichkeiten

Über den Wolken – Grenzenlose Freiheit mit purem Metall?Florian Barth und Katharina Büchse - 21.11.2017, 11:00 Uhr, Raum PragSchwerpunkt: Infrastruktur

ODA X6M & DBVisit, braucht es mehr?Sven Illert - 21.11.2016, 17:00 Uhr, Raum PragSchwerpunkt: Infrastruktur

Flashback Database, Backup und Recovery in Oracle DB 12.2Jörg Sobottka- 22.11.2017, 09:00 Uhr, Raum ShanghaiSchwerpunkt: Datenbank

Oracle Database Appliance – What's New?Marco Friebe - 22.11.2017, 10:00 Uhr, Raum BudapestSchwerpunkt: Infrastruktur

AWR und ASH für die Standard EditionMarco Mischke - 22.2017, 14:00 Uhr, Raum ShanghaiSchwerpunkt: Datenbank

Workshop: Get in Touch with Oracle Bare Metal Cloud Services (BMCS)Katharina Büchse, Florian Barth, Dr. Ingo Laue (Oracle)

21.11.2017 14:00 – 16:00 Uhr22.11.2017 10:00 – 12:00 und 14:00 – 16:00Uhr23.11.2017 10:00 – 12:00 und 14:00 – 16:00Uhr

Raum: Foyer Oslo-IstanbulSchwerpunkt: Infrastruktur

INFORMATIONENam Robotron-Stand 226 auf Ebene 2 und auf www.robotron.de/DOAG


Questions?

Marco MischkeLead Consultant Oracle Support

@DBAMarco

Phone: +49 351 [email protected]

www.robotron.de


Documents

DOAG Conference 2017 AWR and ASH for Standard Edition · PDF fileAutomatic Workload Repository Use Excel to analyze Pivot Charts allow powerful analyzing / filtering. Experts for database