RMOUG Training Days 2019 - Winning performance challenges in oracle standard editions

1. Winning Performance Challenges
in Oracle Standard Editions
Product Manager for Database Monitoring
Feb 21st , 2019
Pini Dibask
RMOUG
Training Days
2019

2. 2
• Pini Dibask, Product Manager for Database Monitoring, Quest Software
• Oracle ACE
• Oracle Certified Professional DBA (OCP)
• Public Speaker )Oracle OpenWorld, IOUG Collaborate, RMOUG, DOAG, OUGN, AOUG)
• Blogger: OracleDBPro.BlogSpot.com
Pini.Dibask@Quest.com
http://Linkedin.com/in/pinidibask
@pini_dibask
About the Speaker

3. 3
Where Am I From?
 Israel, Tel Aviv

4. 4
Who is Quest Software?
9 0 % o f
F o r t u n e 1 0 0
using our
software
1 , 5 0 0
engineers building
quality products
4 M
c o m m u n i t y
m e m b e r s
sharing best practices
3 , 5 0 0
employees focused
on customers
Quest is a global software provider trusted by
100,000 customers and 6,000 partners in 100
countries.
We help IT organizations spend less time on
administration and more time on innovation.
6 , 0 0 0
partners selling
our software

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• Toad database development &
management tools
• Foglight for cross-platform
database performance
monitoring solution
• SharePlex for database
replication
Quest Database Management Solutions

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Agenda
 Introduction to Oracle database performance tuning
 Common challenges when using standard editions
 Winning performance challenges in standard editions
 Q&A

7. Introductions01

8. Confidential8
Performance Tuning could be complicated…
Data Dictionary
Adaptive
Plans
ASH
Time-
Based
Analysis
Change
Tracking
SGA
KPIs
Blocking
Locks
Optimizer
Statistics
Historical
Activity
AWR
Statspack
Advisories
Plan Stability
ADDM
AMM
Baselines
Statistics
Feedback
Plan Analysis

9. Confidential9
Instance
Tuning
Memory
Allocations
I/O
Requirements
CPU Resources
Files
Configurations
Initialization
Parameters
Common Performance Diagnostics Approaches
SQL
Tuning
Optimizer
Statistics
Plan
Analysis
Object
Analysis
Plan
Stability
Initialization
Parameters

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Instance Tuning - Common Things to Consider
 Initialization Parameters - (e.g. MEMORY_TARGET, STATISTICS_LEVEL)
 Files configuration - redo logs, undo tablespace
 Memory structures - ASMM, AMM, min size for buffer pools
 Hardware configuration - memory, storage characteristics, network
 ASM configuration - disk groups and failure groups
 Connection management - both app level and DB level

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 Schema Modeling and Object analysis - Indexes, partitions, materialized views
 Effective use of bind variables
 Oracle CBO features which may impact execution plans
• SQL Profiles (10g)
• Extended Statistics (11gR1)
• SQL plan management (11gR1)
• Adaptive Cursor Sharing (11gR2)
• Cardinality Feedback (11gR2) / Statistics Feedback (12c)
• Dynamic Sampling (10g) / Dynamic Statistics (12cR1)
• Adaptive Plans (12cR1)
SQL Tuning - Common Things to Consider

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1. Determine the most significant bottleneck – i.e. best tuning opportunities
2. Improve/Fix it
3. Repeat until performance is good
My Blog Post:
http://oracledbpro.blogspot.com/2015/09/simple-performance-tuning-methodology.html
Simplified Performance Tuning Methodology

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Time Based Analysis - Which statements should we address first?
 X Axis - db time (CPU time + Non idle wait events)
 Y Axis - number of executions

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Time Based Analysis - Which statements should we address first?
 X Axis - db time (CPU time + Non idle wait events)
 Y Axis - number of executions

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OK, we found the problematic statements - what’s next?
 What is the statement doing and why?
• Execution plan + optimizer statistics
• Most significant wait-events (DB Time standpoint)
)e.g. “checkpoint not complete”, “db file scattered read”)

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How can we find them with enterprise edition & diagnostics pack?
 AWR
 ADDM
 ASH
 ASH Analytics
 SQL Tuning Advisory

17. Confidential17
How can we find them with enterprise edition & diagnostics pack?
 AWR
 ADDM
 ASH
 ASH Analytics
 SQL Tuning Advisory

18. Confidential18
How can we find them with enterprise edition & diagnostics pack?
 AWR
 ADDM
 ASH
 ASH Analytics
 SQL Tuning Advisory

19. Confidential19
How can we find them with enterprise edition & diagnostics pack?
 AWR
 ADDM
 ASH
 ASH Analytics
 SQL Tuning Advisory

20. Confidential20
How can we find them with enterprise edition & diagnostics pack?
 AWR
 ADDM
 ASH
 ASH Analytics
 SQL Tuning Advisory

21. Oracle Standard
Editions02

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Why Standard Editions?
 Less expensive than enterprise edition (but with less capabilities)
 What’s the main challenge when it comes to performance diagnostics?
• Best performance tuning features are part of Diagnostics & Tuning packs
• Diagnostics & Tuning packs – only available with Enterprise Edition

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Which standard editions are available?
 12.1.0.1 and earlier
• Standard Edition – support for RAC, maximum 4 CPU Sockets
• Standard Edition One – no support for RAC, maximum 2 CPU sockets
 12.1.0.2 and above
• Standard Edition 2
For more info:
http://www.oracle.com/us/products/database/oracle-db-se2-brief-2680836.pdf

24. Confidential24
Performance Tuning Challenges for DBAs
Feature No Diagnostics Pack Diagnostics Pack Diagnostics & Tuning Packs
Statspack   
Dictionary Views *
(most of them…)
 
AWR х  
ASH х  
ASH Analytics х  
ADDM/Compare Period ADDM х  
SQL Tuning Advisor х х 
SQL Access Advisor х х 

25. Winning Performance
Challenges in Oracle
Standard Editions03

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So what our options when diagnostics pack not available?
 Statspack - available since Oracle 8i (1998)
 Dictionary Views (below are my favorites…)
• DB statistics – V$SESSTAT, V$SYSSTAT
• SQL statistics – V$SQLAREA, V$SQL
• Execution plan information – V$SQL_PLAN, V$SQL_SHARED_CURSOR
• Object level statistics – V$SEGMENT_STATISTICS
• File level statistics – V$FILESTAT
• Wait events – V$SESSION, V$SESSION_WAIT, V$SYSTEM_EVENT
• Time model statistics – V$SYS_TIME_MODEL, V$SES_TIME_MODEL

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Statspack
 Oracle 8i and above
 “Poor man’s AWR”
 Text based report - no easy navigation
 Less comprehensive than AWR
 Less metrics
 No ASH data

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Monitoring locks via Oracle Dictionary Views Cont’d
SQL> SELECT DECODE (blocking_session, null, null, 'BLOCKED') status,
sid,
lmode,
request,
ctime duration,
USER,
program,
blocking_session,
DECODE (request, 0, NULL, SQL_TEXT) SQL_TEXT
FROM v$lock l
JOIN v$session s USING (sid)
LEFT JOIN v$sqlarea USING (sql_id)
WHERE block = 1 OR request > 0
ORDER BY status
STATUS SID LMODE REQUEST DURATION USER PROGRAM BLOCKING_SESSION SQL_TEXT
----------- ---------- ---------- ---------- ---------- ------- ----------- ---------------------------- ------------------------------------------------
BLOCKED 195 4 5 16581 SALES sqlplus.exe 385 lock table employees in share row exclusive mode
BLOCKED 13 0 3 10129 SALES Toad.exe 385 insert into employees values (1, 'Jason')
385 4 0 16575 SALES sqlplus.exe
Real-Time
Monitoring

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Using Dictionary Views - Example

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Execution Plan Analysis – Estimated vs. Actual
 GATHER_PLAN_STATISTICS hint
 DBMS_XPLAN.DISPLAY_CURSOR(FORMAT=>'ALLSTATS LAST')
Example:

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Execution Plan Analysis – Example
Actual cardinality
almost 10 time
higher than
estimated!

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What are the challenges with these approaches?
 Statspack
• Text format - less intuitive to navigate compared to AWR html format
• Not as feature-rich as AWR
 Dictionary Views
• Limited history
• Cumulative statistics - since startup
But most importantly… no visualization

33. What do these three things have in common?

34. They all provide a clearer perspective -
You can’t fix what you can’t see!
What if you could…
Gain complete visibility into the health
and performance of your cross-
platform database environments

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Workload Analysis using OEM ASH Analytics
Only with
Enterprise Edition +
Diagnostics Pack

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Foglight for Databases: Cross Platform Visibility

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 Foglight for Oracle - the Oracle Diagnostics pack alternative
 Analysis tool-set for deep visibility into database performance
 Supports all editions and configurations
 Remote (“agentless”) collector
Supports all database editions and configurations!
Get Performance Diagnostics Without Spending a Fortune!

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Baseline visualization in Foglight
No baseline
deviation

39. Deep-dive Multi-Dimensional workload analysis
The alternative to OEM Active Session History Analytics
Drilldown,
slice, and dice
operations
Comprehensive
set of
dimensions

40. Investigate Multi-Dimensional wait-events & statistics

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Quickly identifying Blocking locks issues

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Quickly identifying Blocking locks issues

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Quickly identifying Blocking locks issues

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Quickly identifying Blocking locks issues

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Quickly identifying Blocking locks issues

46. Track Changes & Correlate them with your workload
Filter by
Execution Plan
Changes
Correlate
between changes
to the actual
workload
See the SQL
statements which
have new plans

47. Compare between different Execution Plans

48. Compare different Instances or Dimensions

49. Compare different Instances or Dimensions

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Advisories

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What our customers say?

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Additional Resources
Foglight for Oracle Website
https://www.quest.com/products/foglight-for-oracle/
Foglight for Oracle Product Overview Video
https://youtu.be/J9olUZx3YaQ

53. Questions?

54. Thank you