The rolling database upgrade is the way to reduce the downtime during the database upgrade. And you can perform rolling database upgrade with several different method, which include manual task or script, and you can also use DBMS_ROLLING package. When you perform rolling database upgrade using DBMS_ROLLING, it simplifies the overall database upgrade process, which include init, build, start, upgrade, switchover, and finish. So many of these steps can be simplified using DBMS_ROLLING package. Now suppose that you want to perform database rolling upgrade using this package and in the primary database, there is the Oracle GoldenGate capture process running. So whenever you perform transactions on the primary database, the GoldenGate capture continuously capture changes. And also you have a standby database. And this got to be physical standby database, eventually converted to transient logical standby database as part of a rolling database upgrade. So we’re going to upgrade transient logical standby database first. During the upgrade of transient logical standby database, users can connect to a primary database to continue to work. And the Oracle GoldenGate capture process also can be up and running without having any downtime. But as part of a switchover, so let’s say we already completed the upgrade operation for the transient logical standby database, so it’s time to switch over to be able to upgrade original primary database. The question is, how do you handle Oracle GoldenGate capture process? Prior to 23ai, you had to start and then you had to take care of the work of GoldenGate capture process that was running on primary manually. But with the Oracle Database 23ai, when we perform switchover operation, the replication of Oracle GoldenGate capture structure, that’s automatic as part of DBMS_ROLLING switchover. And also, in addition, it provide a support for an Application Continuity and also support for transient Application Continuity. So as you can see, when the roles are changed because of metadata, replication can be replicated to the transient logical standby database. The Oracle GoldenGate capture process also can be failover to the primary database, new primary database automatically. . We can use this feature for the database release upgrade and also for the complex maintenance tasks, and emergency apply of nonrolling patches.
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