DOAG Conference Edition. Marco Mischke, Experts for database solutions.

Transcription

1 DOAG Conference 2017 AWR and ASH for Standard Edition Marco Mischke,

2 About me Oracle DBA since 2000 and Version Certified Professional 10g, 11g RAC / Cluster Certified Expert 10g, 11g, 12c Oracle dbamarco.wordpress.com

3 Facts and Figures Robotron Datenbank-Software GmbH Year of formation 1990 Legal form GmbH (Limited liability company, 8 associates) Number of employees 433 (Status 09/2017) Capital stock Turnover 2017 Technology-Partner 2.4 million EUR 43.8 million EUR Headquarters ISO 9001 certified Congress and Training Center

4 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

5 The Range of Services of Robotron with branch-specific Expertise Methodical and technological responsibility Comprehensive expertise of industry-specific business processes

6 AWR and ASH for Standard Edition AWR and ASH for Standard Edition? Simply not available.

7 Marco Mischke Lead Consultant Oracle Phone: dbamarco.wordpress.com Questions?

8 Agenda Motivation Automatic Workload Repository Active Session History All the rest

9 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

10 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 In contrast the real world from our perspective Pictures: audi.de

11 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 In contrast the real world from our perspective The Audi A4 base model, with some extras maybe Enterprise Edition No or few options like Partitioning Pictures: audi.de

12 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 In contrast the real world from our perspective The Audi A4 base model, with some extras maybe Enterprise Edition 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

13 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

14 Agenda Motivation Automatic Workload Repository Active Session History All the rest

15 Automatic Workload Repository 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

16 Automatic Workload Repository 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

17 Automatic Workload Repository 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

18 Automatic Workload Repository Comparing AWR and Statspack Reports, what s inside that the other lacks awrrpt.sql spreport.sql Foreground Wait Class Top Process Memory Service Statistics Key Instance Activity Stats IOStats by Filetype awrsqrpt.sql sprepsql.sql

19 Automatic Workload Repository 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

20 Automatic Workload Repository 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

21 Automatic Workload Repository Simple example query select to_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$snapshot sn join stats$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(' :30', 'dd.mm.yyyy hh24:mi') and to_date(' :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

22 Automatic Workload Repository Build an APEX application In red: the moment when report queries were disabled in SwingBench and physical reads dropped

23 Automatic Workload Repository Use Excel to analyze Pivot Charts allow powerful analyzing / filtering

24 Automatic Workload Repository Build your own Reports with SQL Developer

25 Automatic Workload Repository Build your own Reports with SQL Developer

26 Automatic Workload Repository Build your own Reports with SQL Developer

27 Automatic Workload Repository Something happened. Check system statistics

28 Automatic Workload Repository Something happened. Check Tablespace I/O

29 Automatic Workload Repository Something happened. between 08:08 and 08:23

30 Automatic Workload Repository Something happened. between 08:08 and 08:23

31 Automatic Workload Repository Something happened. between 08:08 and 08:23

32 Automatic Workload Repository Something happened. between 08:08 and 08:23

33 Automatic Workload Repository Something different happened. between 08:38 and 08:53

34 Automatic Workload Repository Something different happened. between 08:38 and 08:53

35 Automatic Workload Repository Something different happened. between 08:38 and 08:53

36 Automatic Workload Repository Something different happened. between 08:38 and 08:53

37 Automatic Workload Repository There are a lot more tables inside STATSPACK Check PERFSTAT schema Tablenames match the system views V$*** STATS$*** Just be creative

38 Agenda Motivation Automatic Workload Repository Active Session History All the rest

39 Active Session History 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

40 Active Session History 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

41 Active Session History How to visualize it, Enterprise Manager style Query the raw data Put it into Excel Create a Pivot Chart

42 Active Session History Pivot Charts allow drill down Very flexible

43 Active Session History Or, again, use SQL Developer

44 Active Session History Or, again, build/use an APEX application

45 Active Session History Enterprise Manager Activity Page Use Dominic Giles DB Time Monitor : Nice and sweet overview Can t drill down to sessions No real history

46 Active Session History What s going on there?

47 Active Session History

48 Active Session History You will hardly see it in the report Nothing at all

49 Agenda Motivation Automatic Workload Repository Active Session History All the rest

50 ASH Snapper / Tanel Poder Want to have a quick look? Use Tanel Poder s Snapper script: Most Advanced Oracle Troubleshooting Script on the Planet! Monitor a specific session Monitor the whole system Powerful features

51 ASH Snapper / Tanel Poder

52 All the rest SQLd360 / Mauro Pagano Detailed statistics for a specific SQL, limited with no Diagnostic/Tuning license

53 weitere Informationsmöglichkeiten Über den Wolken Grenzenlose Freiheit mit purem Metall? Florian Barth und Katharina Büchse , 11:00 Uhr, Raum Prag Schwerpunkt: Infrastruktur ODA X6M & DBVisit, braucht es mehr? Sven Illert , 17:00 Uhr, Raum Prag Schwerpunkt: Infrastruktur Flashback Database, Backup und Recovery in Oracle DB 12.2 Jörg Sobottka , 09:00 Uhr, Raum Shanghai Schwerpunkt: Datenbank Workshop: Get in Touch with Oracle Bare Metal Cloud Services (BMCS) Katharina Büchse, Florian Barth, Dr. Ingo Laue (Oracle) :00 16:00 Uhr :00 12:00 und 14:00 16:00Uhr :00 12:00 und 14:00 16:00Uhr Raum: Foyer Oslo-Istanbul Schwerpunkt: Infrastruktur Oracle Database Appliance What's New? Marco Friebe , 10:00 Uhr, Raum Budapest Schwerpunkt: Infrastruktur AWR und ASH für die Standard Edition Marco Mischke , 14:00 Uhr, Raum Shanghai Schwerpunkt: Datenbank INFORMATIONEN am Robotron-Stand 226 auf Ebene 2 und auf Die Datenbank-Spezialisten.

54 Marco Mischke Lead Consultant Oracle Phone: dbamarco.wordpress.com Questions?