In the case of a single instance, execute
emca -upgrade db
In the case of Oracle Real Application Clusters (RAC), execute
emca -upgrade db -cluster
DBUA 工具提供了一个可视化的界面，它的作用等同于执行catupgrd.sql等脚本，dbua工具能升级Oracle 的一些组件。组件升级之后，该工具会自动编译无效的对象， 这个功能还是挺方便的。 省得自己手动的去执行编译脚本了。
SQL>SELECT COMP_NAME, VERSION, STATUS FROM SYS.DBA_REGISTRY;
COMP_NAME VERSION STATUS
Oracle Database Catalog Views 10.2.0.4.0 VALID
Oracle Database Packages and Types 10.2.0.4.0 VALID
Oracle Workspace Manager 10.2.0.4.3 VALID
JServer JAVA Virtual Machine 10.2.0.4.0 VALID
Oracle XDK 10.2.0.4.0 VALID
Oracle Database Java Packages 10.2.0.4.0 VALID
Oracle Expression Filter 10.2.0.4.0 VALID
Oracle Data Mining 10.2.0.4.0 VALID
Oracle Text 10.2.0.4.0 VALID
Oracle XML Database 10.2.0.4.0 VALID
Oracle Rule Manager 10.2.0.4.0 VALID
Oracle interMedia 10.2.0.4.0 VALID
OLAP Analytic Workspace 10.2.0.4.0 VALID
Oracle OLAP API 10.2.0.4.0 VALID
OLAP Catalog 10.2.0.4.0 VALID
Spatial 10.2.0.4.0 VALID
Oracle Enterprise Manager 10.2.0.4.0 VALID