SQL Tuning made easier with SQLTXPLAIN.pptx.pdf

8/14/2019 SQL Tuning made easier with SQLTXPLAIN.pptx.pdf

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SQL Tuning made easier with SQLTXPLAIN

Carlos Sierra


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Agenda

! Introduction! Installation!

Main methods XTRACT, XECUTE and XTRXEC XTRSBY and XPLAIN XPREXT and XPREXC

! Main HTML diagnostics report

SQL Tuning made easier with SQLTXPLAIN (SQLT)


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SQLTXPLAIN (SQLT)

Introduction


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What is SQLTXPLAIN (SQLT)?

!Add-on (MOS 215187.1)! 11g/10g! Linux, UNIX, Windows! Single instance, RAC, Exadata! Easy to install and execute! download and use

Tool to diagnose SQL statements performing poorly


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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?


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SQLTXPLAIN (SQLT) mechanics

! 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, 10053, 10046, TKPROF, etc.

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

! SQLT installs its own two schemas and objects on them!

How does it work?


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SQLT Installation


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How do I install SQLT?

! Download tool (sqlt.zipfile)! Unzip into database server! Execute sqlt/install/sqcreate.sql

connected as SYS

! Input installation parameters

My Oracle Support (MOS) 215187.1


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SQLT Installation Parameters

! Optional Connect Identifier (ie: @PROD)! Password for user SQLTXPLAIN! Default Tablespace! Temporary Tablespace! Main application user of SQLT! Oracle Pack license [ T | D | N ]

Provided inline or when asked


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How do you know Installation succeeded?


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How do I uninstall SQLT

! Execute sqlt/install/sqdrop.sqlconnected as SYSIn case you no longer need SQLT


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SQLT Main Methods


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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


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Using SQLT Main MethodsMethod Script Features

SQLTXTRACT sqlt/run/sqltxtract.sql "Most common method"Inputs SQL_ID"SQL statement is not executed

SQLTXECUTE 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 statementSQLT XTRXEC sqlt/run/sqltxtrxecsql "Combines XTRACT and XECUTE

"Inputs SQL_IDSQLT XPLAIN sqlt/run/sqltxplain.sql "Inputs a file name which contains a SQL statement

"What 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 databases"Executes in Primary and connects into stand-by"Works like XTRACT"Inputs SQL_ID and DBLINK


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!XTRXECincludesXTRACT and XECUTE

XPLAIN

XTRSBY

CommonXTRACT

XECUTE

SQLT Output Overlap


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SQLT Main HTML

Diagnostics Report


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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)


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



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



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Navigating the SQLT Main Report

1. SQL Text2. Plans Summary3. Observations4. Branch as per findings

Typical Navigation


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DemonstrationMain Report Navigation

! SQLT XTRACT! SQLT XECUTE


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Summary


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SQL Tuning made easier with SQLTXPLAINHow is that?

! Full collection of SQL tuning diagnostics Consolidated into an easy-to-navigate html report Consistent view Allow offlineexpert 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


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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


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Eager to master SQL Tuning?

! Jonathan Lewis! Maria Colgan! Tom Kyte! Kerry Osborne! Cary Millsap! Christian Antognini! Guy Harrison! Karen Morton

Some SQL Tuning Gurus (Google them!)


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My Oracle Support Notes and Contact Info

! 215187.1SQLTXPLAIN (SQLT) Tool Download! 1454160.1 SQLTXPLAIN (SQLT) FAQ

MOS (Metalink) Notes

! [email protected]! http://carlos-sierra.net! @csierra_usa


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Documents

SQL Tuning made easier with SQLTXPLAIN.pptx.pdf