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Transactional Data Management for Eliminating Database Downtime When Upgrading or Migrating from Oracle 8i or 9i to Oracle 10g
Author: Alok Pareek, Vice President of Technology, GoldenGate Software, Inc.
Abstract: Eliminating database downtime for upgrades or migrations in mission-critical Oracle database environments running Oracle database software version 9.2.0.x (or lower) poses a significant challenge for IT organizations. That is particularly true for critical applications that must provide continuous or near-continuous operations to users who increasingly expect uninterrupted availability of online service. Any outage of an application or website, even if that outage is scheduled or "planned," has an impact on the revenue and reputation of the business.
The purpose of this paper is to present a solution that tackles the specific challenge of upgrading or migrating an Oracle 8i or 9i database to Oracle software version 10.x - without taking any database downtime. Key technology components used in this solution are GoldenGate Software's Transactional Data Management (TDM) software and Oracle's Cross Platform Transportable Tablespace feature.
The details within this paper will showcase key technical strengths of the solution, including how to achieve a rolling upgrade/migration for this scenario; using a clone database to offload instantiation and conversions; keeping transactions in synch across the databases; managing "partial" or phased migrations or upgrades; conducting data verification post-upgrade/migration; and implementing an easy and reliable failover strategy.
Table of Contents
Section
- Introduction
- Goals
- Concepts and Terminology
- Transactional Data Management (TDM) and Oracle
- Database Upgrade
- Database Migration
- Standby Database
- Transportable Tablespace
- Cross Platform Transportable Tablespace
- Clone Database
- RMAN (Recovery Manager)
- Zero-Downtime Approach Using TDM and Oracle
- Upgrade vs. Migration Challenges
- Business Challenges
- Technical Challenges
- Available Solutions: 8i/9i --> 10g Upgrade or Migration
- Database Upgrade Assistant
- Export/Import
- SQL Plus As Copy
- Transportable Tablespaces
- SQL*Loader
- Oracle Dataguard, Oracle Streams
- Transactional Data Management (TDM)
- Overview of GoldenGate's TDM Technology Components
- Capture
- On Disk Queues aka "Trail files"
- Delivery (Apply)
- GoldenGate Veridata
- Overview of Cross Platform Transportable Tablespaces Feature
- Detailed Steps Using a Platform Migration Case Example
- Migration without Failback
- Migration with Failback
- Failback Steps
- Partial Migration Using Bi-Directional Synchronization
- In Summary
About the Author
References
Contact Information
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