SQL Tuning made much easier with SQLTXPLAIN (SQLT) Mauro Pagano Senior Principal Technical Support...

SQL Tuning made much easier with SQLTXPLAIN (SQLT)

Mauro PaganoSenior Principal Technical Support Engineer

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Program Agenda

Introduction

Main Methods

Main HTML Diagnostic Report

Summary

Q&A

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Program Agenda

Introduction

Main Methods


Summary

Q&A

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3

4

5


What is SQLTXPLAIN (SQLT)?

• Add-on (available at MOS 215187.1)• Free to download and use • Works on 12c,11g,10g• Linux, UNIX, Windows• Single instance, RAC, Exadata, In-Memory• Easy to install and execute

Tool to diagnose SQL statements performing poorly


SQLTXPLAIN (SQLT) origins

• SQL Tuning diagnostics gathering– time consuming and time sensitive manual process– not straightforward, need to know what to extract and how – more info/diag release after release

• Avoid reinventing the wheel, quickly spot known issues / concerns

• Several RDBMS features provide insights but often overlooked

Why do I need a tool to collect diagnostics?


SQLTXPLAIN (SQLT) benefits

• Collect SQL tuning diagnostics for one SQL statement• Over a hundred health-checks (HC) around the SQL statement• If Oracle Tuning or Diagnostics Pack are properly licensed

– Invokes SQL Tuning Advisor (STA)– Includes Active Session History (ASH) and SQL Monitor Report– Includes Automatic Workload Repository (AWR)

• Automatic SQL tuning test case (TC) extraction• SQLT helps to expedite SQL tuning process

What is in it for me?


SQLTXPLAIN (SQLT) mechanics

• Install once, execute many• 3 + 4 main methods to analyze one SQL statement• Inputs one SQL statement and outputs one zip file• Output contains a main html report and other files

– AWR, ADDM, ASH, SQL Mon, 10053, 10046, TKPROF, etc.

• Exports SQL tuning test cases– SQLT TC and TCX plus 11g Test Case Builder (TCB)

• SQLT installs its own two schemas, does not pollute the application!

How does it work?


Program Agenda

Introduction

Main Methods


Summary

Q&A

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3

4

5


SQLT Main Methods

• SQLT XTRACT• SQLT XECUTE• SQLT XTRXEC• SQLT XPLAIN• SQLT XTRSBY• SQLT XPREXT• SQLT XPREXC

All 3 + 2 + 2 act on one SQL statement

All methods have these requirements

SQL*Plus connecting as application user

Application user must have SQLT_USER_ROLE granted

Password for SQLTXPLAIN must be provided

One SQL per use of SQLT

SQLT has its own configuration parameters


Using SQLT Main MethodsMethod Script Features

SQLT XTRACT sqlt/run/sqltxtract.sql Most common methodInputs SQL_IDSQL statement is not executed

SQLT XECUTE sqlt/run/sqltxecute.sql Inputs a script name which contains ALTER SESSION commands (if applicable) Binds declaration and assignment (if applicable) SQL statement

Executes the SQL statement

SQLT XTRXEC sqlt/run/sqltxtrxecsql Combines XTRACT and XECUTEInputs SQL_ID

SQLT XPLAIN sqlt/run/sqltxplain.sql Inputs a file name which contains a SQL statementWhat if SQL contains binds?Leave them in place, OR Replace with literals of same data type

SQLT XTRSBY sqlt/run/sqltxtrsby.sql For read-only databasesExecutes in Primary and connects into stand-byWorks like XTRACTInputs SQL_ID and DBLINK


XTRXEC includes XTRACT and XECUTE

XPLAIN

XTRSBY

CommonXTRACT

XECUTE

SQLT Output Overlap


Program Agenda

Introduction

Main Methods


Summary

Q&A

1

2

3

4

5


What is included in Main Report?

• Health-checks• SQL text• Parameters• Cursor sharing• SQL Tuning Advisor (STA) report• Execution plans

Partial list of contents (1/3)



• Plan stability• Active Session History (ASH)• SQL performance metrics• SQL Monitor• Segment and session statistics• Tables




• Indexes• CBO statistics• Objects and dependencies• Policies• Metadata



Navigating the SQLT Main Report

1. SQL Text

2. Plans Summary

3. Observations

4. Branch as per findings

Typical Navigation


Demonstration

Main Report Navigation

• SQLT XECUTE


Demonstration


Demonstrantion


Demonstration


Demonstration

Same SQL in 12c uses an Adaptive Plan, SQLT helps making it more readable


Demonstration

If we want to force this plan in another db we can just grab these hints


Demonstration


Demonstration

SQLT provides info about the performance history for the SQL (from AWR)


Demonstration

SQLT extract info from ASH to help identify where time was spent


Demonstration


SQLT Additional Methods

• COMPARE– Compares everything that surrounds a SQL (object definition,

statistics, parameters, execution plan, etc) across two systems

• XPLORE– Evaluates the impact of every CBO parameter / fix on

the execution plan – Automates hundreds on tests in single operation

What else can I do with SQLT?


Program Agenda

Introduction

Main Methods


Summary

Q&A

1

2

3

4

5


SQL Tuning made easier with SQLTXPLAIN

• Full collection of SQL tuning diagnostics– Consolidated into an easy-to-navigate html report– Consistent view – Allow offline expert analysis

• Over a hundred health-checks around the SQL statement– Some with pointers to particular notes or bugs

• Automatic SQL tuning test case (TC) extraction– Allow WHAT-IF evaluations on a test environment

• Dynamic readme with commands for further diagnostics

How is that?


Want to master SQLTXPLAIN?

Book: Oracle SQL Tuning with Oracle SQLTXPLAIN

Author: Stelios Charalambides Released: March 20, 2013 Level: Intermediate Available

Apress Amazon Barnes&Noble


Important Support Resources

• Discover more about Get Proactive:

• http://www.oracle.com/goto/proactivesupport

• MOS Notes:

• 215187.1 SQLTXPLAIN (SQLT) Tool Download

• 1454160.1 SQLTXPLAIN (SQLT) FAQ

• MOS Community:

• SQLTXPLAIN (SQLT): General Discussion

What if I want to know more?

http://www.oracle.com/goto/proactivesupport

https://communities.oracle.com/portal/server.pt?open=514&objID=224&mode=2&threadid=454860&aggregatorResults=T454860T659202T354976&sourceCommunityId=575&sourcePortletId=336&doPagination=true&pagedAggregatorPageNo=1&returnUrl=https://communities.oracle.com/portal/server.pt?open=space&name=CommunityPage&id=3&psname=Opener&psid=2&cached=true&in_hi_userid=373459&control=SetCommunity&PageID=0&CommunityID=575&


Program Agenda

Introduction

Main Methods


Summary

Q&A

1

2

3

4

5

SQL Tuning made much easier with SQLTXPLAIN (SQLT) Mauro Pagano Senior Principal Technical Support...

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