Oracle Database 11g –What Does This Mean? Thomas Kyte

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Oracle Database 11g – What Does This Mean?

Thomas Kyte

http://asktom.oracle.com/

© 2010 Oracle Corporation 2

So … What Does Oracle Database 11g

Mean To Me?


So … What Does Oracle Database 11g

Mean To Me?

Change


What do you have from the past…

• Online Parameter Changes

• Online Major Memory Changes

• Online Schema Evolution

• Online Index Creates

• Quiesce

• Rolling Upgrades

• Online Disk reconfiguration (ASM)

• Online Cross Platform Tablespace Transport

• Full Database Transports

• And more….


What do you need?

Capture andReplay Workload

Set Up TestEnvironments

Detect and TunePerformance Changes

SQL Plan Management

Total RecallOnline Application

Upgrade


What do you need?




SQL Plan Management


Upgrade


Active Data Guard:

Develop & Test on Standby DB

• Use physical standby databasefor development & testing• Preserves zero data loss in test/dev mode

• Flashback DB to back-outchanges & use as standby

Production

Database

Standby

Database

Developers,

Testers

Eliminates cost of idle DR system


Rolling Database Upgrades

Major

Release

Upgrades

Patch Set

Upgrades

Cluster

Software &

Hardware

Upgrades

Initial SQL Apply Config

ClientsRedo

Version X Version X

1

BA

Switchover to B, upgrade A

Redo

4

Upgrade

X+1X+1

BA

Run in mixed mode to test

Redo

3

X+1X

A B

Upgrade node B to X+1

Upgrade

Logs

Queue

X

2

X+1

A B


What do you need?




SQL Plan Management


Upgrade


……

ClientClient

…Client

Capture DB Workload

Make Change Safe -Realistic Testing with Database Replay

• Recreate actual production database workload in test environment

• No test development required

• Replay workload in test with production timing

• Analyze & fix issues before production

Middle Tier

Storage

Oracle DB

Replay DB Workload

Production Test

Test migration to RAC


What do you need?




SQL Plan Management


Upgrade


Make Change Safe –Find Regressed SQL with SQL Performance Analyzer

© 2010 Oracle Corporation 13© 2010 Oracle Corporation 13

It’s Automatic!

Choose

Candidate

SQL

one

week

Automatic SQL Tuning in 11g

Workload

SQL Tuning

Candidates

Test SQL ProfilesImplement

SQL Profiles

Generate

Recommendations

AWRDBA

View Reports /

Control

Process


What do you need?




SQL Plan Management


Upgrade


Without SQL Plan Management• Challenging to "freeze" execution plans and statistics

• Difficulty:

• Statement has been parsed and a plan got created

Verification happens during execution:

• Now some conditions get changed (statistics, upgrade, parameters)

• A new plan will be created - is it better or worse???

HJ

HJ

GB

Parse Execute Plan acceptable

NL

NL

GB

Parse Execute Plan possiblynot acceptable


SQL Plan Management

• First preventive and fully transparent database

mechanism to ensure plan stability

• SQL execution plans will be recorded

• A SQL Baseline will be created

• Consist of accepted execution plans

• Contains only plans for statements being parsed/executed more than once

• Only known, verified and accepted plans will be used

• Package: DBMS_SPM


SQL Plan Management - Scenarios

• Upgrade scenario 1:

• Parameterize the optimizer back to the "old" behaviour

• Works for all database releases since 8.0.3

• Upgrade scenario 2:

• Transport the well known plans to the new release

• Works since 10gR2

• Also works with stored outlines (pre 10g) with

DBMS_SPM.MIGRATE_STORED_OUTLINE

• Ship a new application (module) along with appropriate SQL plan

baselines:

• Ship the best execution plans for the new statements within a staging

table and ensure that they'll be used

• Works since 11g


SQL Plan Management - New Application

• New application (module) gets delivered - and it's possible to deliver the right execution plans, too:

• @Software Vendor:

• Create a staging table using DBMS_SPM.CREATE_STGTAB_BASELINE

• Pack the required baselines into the staging table using DBMS_SPM.PACK_STGTAB_BASELINE

• Export the staging table into a dump file using Data Pump or Export and transport it to the target system

• @Customer:

• Import the dump file into the target database

• Unpack the SQL Plan Baselines from the staging table into the SQL Management Base of the target system• DBMS_SPM.UNPACK_STGTAB_BASELINE


What do you need?




SQL Plan Management


Upgrade


Flashback for Rapid Recovery from

Human Error

FlashbackDatabase

FlashbackData Archive

and Transaction

FlashbackTables

FlashbackQuery


Flashback Data Archive

• Flashback Data Archive

• Easy, practical way to add

“time dimension” to your data

• For change tracking, ILM,

auditing, compliance, …

• Query data “AS OF” any time in

the past

• Efficient storage / retrieval of

undo data User

Tablespaces

Flashback Data

Archive

Archive

Tables

Select * from ordersAS OF’12am 31-Dec-2003’

Total Recall

ORDERS


Restore Points• Restore point – specifies a jump label

• Named Restore Point• Similar to a bookmark

• "Can be" - but no guarantee

• Will be recorded to the control file

• Guaranteed Restore Point• Similar to storage snapshots

• Overrides the FLASHBACK_RETENTION_TARGET

• Attention: A guarantee restore point can stop the whole database

SQL> CREATE RESTORE POINT rpt;

SQL> FLASHBACK DATABASE TO RESTORE POINT rpt;

SQL> CREATE RESTORE POINT grpt

GUARANTEE FLASHBACK DATABASE;

SQL> FLASHBACK DATABASE TO RESTORE POINT grpt;


What do you need?




SQL Plan Management


Upgrade


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How to get there


Upgrade is easier!• The upgrade to Oracle Database 11g is much easier

than any upgrades to earlier Oracle releases

• Size of Upgrade guides:• 8.1.7 - 512 pages

• 9.0.1 - 484 pages – 111 steps for an RDBMS with 9 components

• 9.2.0 - 344 pages

• 10.1.0 - 170 pages

• 10.2.0 - 140 pages

• 11.1.0 - 186 pages

• 11.2.0 -178 pages


Documentation

• Note:785351.1 Upgrade Companion 11g Release 2


What are my upgrade paths?Predictable performance post-upgrade

10.2.0.2

11.1.0.6

10.1.0.5

9.2.0.8

11.2

SQL Plan Management

Automated SQL tuning

Real Application Testing

Q U E S T I O N S

A N S W E R S

Documents

Oracle Database 11g –What Does This Mean? Thomas Kyte