What: “Beating the Oracle Optimizer” by Jonathan Lewis

When: Friday May 18, 2012

Where: TruTek | 1740 S Main Street | SLC, UT

Since, these presentations aren’t generally published, I took notes, not guaranteed to be correct.

Graham Wood Hidden Features

Free Features

dbms_monitor.session_trace_enable  10g

plan_stat   11g argument added to dbms_monitor.session_trace_enable 

dump plan when cursor is closed

now, after the first execution, never, all_executions, they dump row source statistics

cursor mapping broken 11gr1, statement text printed on every execute

long cursor numbers 11gR2, not so human readable

TKPROF enhancements

                Prints sql ID and plan hash for each statement

                Reports First, Avg, Max from multiple row source dunmps

                But not CLOSE … DOH!

Enable trace foe individual statements

                Alter session set events ‘sql_trace [sql:…]

Getting sql info V$SQLstat (10g), doesn’t use any latches

                Using V$SQL can make latch problems worse

DBMS_XPLAN.DISPLAY_CURSOR,

EXPLAIN_PLAN doesn’t work correctly, so use DBMS_XPLAN

Select * from table (dbms_xplan.display_cursor (“atnoianf82398nhfa’, NULL, ‘ADVANCED’));

Select * from table (dbms_xplan.display_cursor (format=>’ALLSTATS LAST’))

Use the CARDINALITY HINT to check the actual plan

Select /*+ gather_plan_statistics +/

Set a parameter for running an individual statement

SELECT /* + OPT_PARAM(‘star_transformation’….

_optimizer_ignore_hints=TRUE, useful for testing

Optimizer Statistics

Pending Statistics

                Separates stats collection from stats publishing

                Capture stats as pending

                Test using pending stats

                Publish once verified

Controlled by parameter – optimizer_use_pending_statistics

                Determines if the optimizer will use pending stats

Set to FALSE by default in 11g

                Use dbms_stats.set_*_stats

                Very useful for min max values

Setting Statistics

Dbms_stats.datearray(to_date(‘01/01/1999’, ‘MM/DD/YYYY)’, sysdate)

Dbms_stats.set_column_stats(‘scott’,’emp’,’hiredate’,srec=>sr);

Gather incremental stats in 11g uses “synopsis”. Make sure to clear all the stats and use one pass to create the “SYNOPSIS”.

LISTAGG – Analytic Query

First_value, nth value, last value

External Tables

External Table Preprocessor

Stop use SQL Loader – user External tables  - parallel loads with a degree of parallelism

                The use of a “preprocessor” allows for uncompressing zip files

                External tables allow us to filter the data before loading the data.

Sqlplus –prelim / as sysdba   gives access to in memory structures with no SQL access, no latches or SQL allowed.

Aren’t Free

AWR captures top 5

dbms_workload_repository.modify_snapshot_settings (topsql=>200)

dbms_workload_repository.add_colored_sql(‘sql_id’) to capture marked SQL, this marks the SQL

Reporting

AWR SQL report

AWR Diff Report

AWR RAC report

ASH report any time period, instance or filtered, filtering at session level is like SQL trace

                Use ADDM report!

Check Cardinality using SQL Monitor, key to work out why the execution plan may not be optimal.

“I think all of TruTek’s assistance and especially the upgrade class were key to making this project successful.” Dan 2-15-12

115102 Upgrade Client in CA going live on R1213 – Research Organization

“This latest upgrade test on the new production hardware went very well.  I don’t see any problem getting the  upgrade done over a 3 day weekend.  I have you guys to thank for that.”  Terry 1-31-12

I’ve never been to a foriegn country where they spoke mostly English. The English people are great, very direct, but not as harshly direct as the Dutch or Germans (my grandmother was very German). My wife wants me to bring chocolates, so I went to the store and bought whatever looked good and different from what we have in the US. I’ll try it all out when I get home.

The Big Picture of the R12.1.3 Upgrade

It’s coming! Don’t close your eyes. Face it head on. Ease your worries by attending this walkthrough of an upgrade from Release 11.5.10.2 to Release 12.1.3. We’ll describe the tried and true tips and techniques when we upgrade – everything from “oops – did you know about these extra patches?” to ways to decrease your down time.

The Big Picture shows at a high level the tasks and challenges of the R12.1.3 upgrade. The Big Picture describes how to get started, how to motivate business users to upgrade, and whether to re-implement or upgrade. It covers the technical upgrade steps with a few functional steps; understanding these steps helps all team members work toward a better upgrade.

Great Sessions. On Tuesday, the keynote featured Ognjen Pavlovic from Oracle, speaking on the EBS: Vision, Strategy and Roadmap.

I presented “The Big Picture: Upgrading to R12.1.3″ at 9:45. After my presentation, I was asked to fill in for a missing panelist, on the OAUG Fusion Council – Fusion Applications Panel Discussion. The next session was the Best of OOW Panel – Four Presentation We Can’t Stop Talking About. I summarized Nadia’s presentation from OOW on Co-Existence if Fusion with EBS. Bill Dunham summarized Sara Woodhull presentation. In my opinion, Nadia and Sara have the two most important presentations from OOW. Alyssa Johnson summarized the EBS Vision, Strategy and Roadmap presentation from OOW.

In the last session of the day on Tuesday, I presented the “Release 12.1.3 Technical Upgrade Overview”. This is my favorite presentation because I go into alot of details about what breaks in the upgradee and why. I also present my opinion on hardware options.

On Wednesday morning, I went to Barb Matthews’ presentation on “Lessons Learned from the R12.1 Upgrade”. This presentation is based on my upcoming article in OAUG Insight magazine, that Barb helped write.

Then, I went to Donna Campbell’s presentation on “What you need to know about Identifying Customizations, before Upgrading to Release 12.1.3. This was co-presented by Barb Matthews, with an interesting story of a customization that she wrote years ago.

This is a picture of the Release 12.1 Upgrade Panel, with Anne Carlson, Mike Swing and Bill Dunham shown.

R12.1 Upgrade Panel

Today I had a very busy day. I presented “The Big Picture” after the keynote. The next hour I was on the OAUG Fusion Council – Fusion Applications Panel Disscusions, with John Stouffer and Alyssa Johnson.

Then, I summarized Nadia’s Co-Existence presentation, from the Best of OOW Panel with Bill Dunham and Alyssa Johnson, and finished the day with the “Release 12.1.3 Technical Upgrade Overview” presentation.

I have two presentations:

The R12.1.3 Technical Upgrade Overview

and,

 The Big Picture of the R12.1 Upgrade

It’s coming! Don’t close your eyes. Face it head on. Ease your worries by attending this walkthrough of an upgrade from Release 11.5.10.2 to Release 12.1.3. We’ll describe the tried and true tips and techniques when we upgrade – everything from “oops – did you know about these extra patches?” to ways to decrease your down time.

The Big Picture shows at a high level the tasks and challenges of the R12.1.3 upgrade. The Big Picture describes how to get started, how to motivate business users to upgrade, and whether to re-implement or upgrade. It covers the technical upgrade steps with a few functional steps; understanding these steps helps all team members work toward a better upgrade.