Oracle ACS (Advanced Customer Services) developed a services based solution to deliver low downtime, low risk migrations and upgrades using Oracle GoldenGate as the enabling technology. Oracle GoldenGate has a long track record of successful migrations and upgrades with little or no downtime. Combining this technology with the services provided by Oracle ACS and customers now have an option significantly reduce their downtime when migrating or upgrading their Oracle databases. The Oracle ACS Migration Service uses functions integrated in the Oracle Database for the initial load of the target system and Oracle GoldenGate for ongoing data synchronization (see image below). The process is suitable for all Oracle E-Business Suite products on an Oracle Database of any size. The end result is a database migration with low amount of downtime for business users.
One common question that comes up regarding this specific migration service is “Oracle GoldenGate provides zero downtime migrations for other applications, why not E-Business Suite?” The reason why the migration service is a low downtime solution and not zero is that E-Business Suite uses Oracle Advanced Queues, which under meta data tables use the ANYDATA data type. This particular data type is not currently supported by Oracle GoldenGate and as such has to be moved in bulk. These tables typically have a very small amount of data and prior to cutting over to the new target environment, these tables are moved from the source to target as a complete unit. A small amount of time is needed to perform this action.