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Oracle Performance Tools of the Trade
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Oracle Performance Tools
of the Trade Carlos Sierra
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Carlos Sierra •
SQLTXPLAIN + SQL Health-‐Check SQLHC + • Consultant/Developer/DBA/Design/+ • Oracle Performance + SQL Tuning • Oracle Database Health-‐Check • Tools + Scripts • Speaker Enkitec © 2014 2
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Tools of the
Trade • OEM • AWR • ADDM • ASH • Snapper • EDB360 Enkitec © 2014 3
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OEM • Oracle
Enterprise Manager (OEM) – Database Control – Grid Control • GUI Tool for System Monitoring – Including Performance Enkitec © 2014 4
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AWR • Automa[c
Workload Repository (AWR) • Requires Oracle Diagnos[cs Pack License • Set of DBA_HIST views • Periodic Snapshots (1hr apart by default) • 7 days history (by default) Enkitec © 2014 22
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AWR Demo •
Exadata with happy Users (no complains) • Which bo_lenecks you see? • What is your hypothesis? • What would be your ac[on plan? Enkitec © 2014 23
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AWR Demo Conclusions
(1) • High Parsing – Use of Literals instead of Bind Variables • Some subop[mal SQL was[ng CPU cycles • High Background Waits related to DBWR • Write Back Flash Cache disabled – Hard to spot! Enkitec © 2014 38
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AWR Demo Conclusions
(2) • 6 copies of Control Files – 2 members in 2 high redundancy disk groups • Thousands of Tablespaces (thus Data Files) • Frequent Log switches due to small size – Think Checkpoints upda[ng SCN on Data Files and Control Files Enkitec © 2014 39
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AWR Demo Conclusions
(3) • There is usually more than 1 culprit – Even when performance is fine • Database health-‐check is like any other – Early detec[on is preferred • Mo_o: “if it ain't broke, don't fix it” – Really? – Would you apply this mo_o to your own health? Enkitec © 2014 40
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Alert Log •
As old as Oracle • Your friend • Like reading your Daily News • Watch for ORA errors – And fix them! • Rename every so olen Enkitec © 2014 41
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ADDM (1) •
Automa[c Database Diagnos[c Monitor • Requires Oracle Diagnos[cs Pack License • Its goal is to reduce DB Time – Wait and CPU [me of all non-‐idle user sessions • Based on AWR data – Hourly execu[on by default Enkitec © 2014 42
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ADDM (2) •
Database, Instance or Par[al modes • Available via OEM or SQL*Plus – DBA_ADVISOR_* – DBA_ADDM_* • Be cau[ous with “Advice” Enkitec © 2014 43
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ASH (1) •
Ac[ve Session History (ASH) • Requires Oracle Diagnos[cs Pack License • Ac[ve Session – On CPU; or – Non-‐idle Wait Enkitec © 2014 44
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ASH (2) •
Snapshot of V$SESSION every second – V$ACTIVE_SESSION_HISTORY – Every 10 seconds on AWR • DBA_HIST_ACTIVE_SESS_HISTORY • Source of truth • Mul[-‐dimension Enkitec © 2014 45
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Snapper • Free
download and use Script • Installs nothing • Does NOT requires Oracle Diagnos[cs Pack • Session centric – snapper.sql all seconds_in_snap snap_count sid – @snapper.sql all 30 1 2617 Enkitec © 2014 47
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EDB360 Enkitec ©
2014 50 • Free download and use Tool • Installs nothing • 360-‐degree view of an Oracle database • Designed to ease a database health-‐check • Pack License? Days? HTML? Txt? CSV? Chart? • @edb360.sql T 31 Y Y Y Y
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EDB360 Demo •
11.2.0.3 on a barely used Exadata system • What do you see? Enkitec © 2014 51
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EDB360 Demo Conclusions
• Configura[on • Administra[on • Time Model • Wait Events • AWR + ADDM + ASH Reports • Top SQL Enkitec © 2014 57
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References • Oracle
Database Performance Tuning Guide 11g Release 2 • Snapper -‐ Tanel Poder – h_p://blog.tanelpoder.com/files/scripts/ snapper4.sql • h_p://www.enkitec.com/products/edb360 Enkitec © 2014 58
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Contact Informa[on •
carlos.sierra@enkitec.com • carlos-‐sierra.net • @csierra_usa Enkitec © 2014 59