使用dbua升级时，需要手工设置CLUSTER_DATABASE参数么？
来源于：
Is Manual Setting Of CLUSTER_DATABASE Parameter Required For DBUA Upgrade? (文档 ID 741081.1)

适用于：
Oracle Server - Enterprise Edition - Version: 10.1.0.2 to 11.1.0.8
Information in this document applies to any platform.

目标：
When manually upgrading RAC databases, the parameter CLUSTER_DATABASE has to be set to FALSE. Is this required during upgrade using DBUA ?

解决方案：
DBUA will automatically set this parameter to FALSE even if it is enabled. You do not need to change the CLUSTER_DATABASE parameter when upgrading using DBUA. You should see information similar to the following in the DBUA trace.log, which confirms that this parameter has been changed:

[Thread-274] [12:56:2:742] [PreMigration.executeStepImpl:146]? Bounce the database in pre Upgrade
[Thread-274] [12:56:2:742] [Database.shutdownOPSDuringMigration:1631]? is Windows false
[Thread-274] [12:56:2:743] [Database.shutdownOPSDuringMigration:1632]? Database Version = 10.2.0.2.0
[Thread-274] [12:56:2:743] [Database.shutdownOPSDuringMigration:1635]? Set cluster_database=false