An introduction to edition-based redefinition, a technology which enables zero-downtime application releases for Oracle Database. Discusses the challenges with deploying PL/SQL code changes, and shows how EBR solves these issues.

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Using Edition-Based Redefinition
with PL/SQL
How to deploy database code changes with zero downtime
Chris Saxon, Oracle Developer Advocate for SQL
chris.saxon@oracle.com
@chrisrsaxon & @sqldaily
blogs.oracle.com/sql

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It is intended for information purposes only, and may not be
incorporated into any contract. It is not a commitment to deliver
any material, code, or functionality, and should not be relied upon
in making purchasing decisions. The development, release, and
timing of any features or functionality described for Oracle’s
products remains at the sole discretion of Oracle.

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The PL/SQL Deployment
Challenge!
How do we get PL/SQL into production with no outage?

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No time to test

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Application may be
INconSIStenT

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Can’t get DDL lock

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Emergency Rollback?

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Solutions pre 11gR2

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PROCEDURE_3
VIEW_2
Rename Your Objects!
PROCEDURE PROCEDURE_2
PACKAGE PACKAGE_2 PACKAGE_3
VIEW VIEW_3

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VIEW_2
Dependency Hell
PROC PROC_2
PACK PACK_2 PACK_3
VIEW VIEW_3
PROC_3a
PACK_3a
VIEW_3b
PROC_4
VIEW_2a

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Multiple PL/SQL Schemas
DATA
PL/SQL
1
PL/SQL
2

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Replicate Your Database
$$$&

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•No Database
•Compiled
PL/SQL!!

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EBR to the
Rescue!

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PROCEDURE
VIEW
EDITION_1 EDITION_2 EDITION_3
EBR to the Rescue!
PROCEDURE PROCEDURE PROCEDURE
PACKAGE PACKAGE PACKAGE
VIEW VIEW VIEW

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How do I
use EBR?

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DEMO

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That was too easy!
Surely there must be a catch?

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You can’t
disable editions

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Not Everything is Editionable
MY_PACKAGE
PUBLIC
SYNONYM
MATERIALIZED
VIEW
Addressed in 12c!

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Many editions
>
risk of missteaks

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Minimize Live Editions
Remove access to old editions
Explicitly specify edition
Good governance!

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Wait, There’s More!
EBR

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Summary
• Use EBR to deploy PL/SQL with zero downtime
• Easier than replication
• More practical than package renaming
• Requires 11g Release 2 +

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Further Reading
• 11gR2 Documentation:
http://docs.oracle.com/cd/E11882_01/appdev.112/e41502/adfns_editions.htm#ADFNS020
• 12cR1 Documentation: http://docs.oracle.com/database/121/ADFNS/adfns_editions.htm
• Oracle-BASE article: http://oracle-base.com/articles/11g/edition-based-redefinition-11gr2.php
• Tom Kyte’s Oracle Magazine article, Edition-Based Redefinition, Part 1:
http://www.oracle.com/technetwork/issue-archive/2010/10-jan/o10asktom-172777.html
• Edition-based redefinition whitepaper, Bryn Llewellyn July 2009:
http://www.oracle.com/technetwork/database/features/availability/edition-based-redefinition-1-
133045.pdf

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Questions?