Updating oracle db using servlet
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You can click the "RAC - instance(s) up" link and it will take you to a page with the instance details.You can now select an instance and navigate to the Performance Hub, the Instance Home Page, or the Memory Page for the selected instance. If you click the RAC tab, you will see a list of instances.
However, to use the performance features, you will need the Oracle Diagnostics Pack.In order to assist a Database Administrator, EM Express also provides support for basic administrative tasks such as storage and user management.For more information, see the section on EM Express Administration Functions. EM Express is a database management tool that is automatically RAC-aware.EM Express is designed to be lightweight and to incur minimal overhead on the database server. It does not require any separate middle-tier components.In order to achieve this goal, EM Express is built inside the Oracle Database and only uses internal infrastructure components. Since EM Express is built inside the database, the database has to be open in order to use EM Express, and EM Express cannot perform actions outside the database.Similarly, certain regions of the Home Page, such as the SQL Monitor List, will not be shown on SE and XE because they require the Tuning Pack.
Although EM Express is RAC-aware in general, some pages will allow you to view instance-specific information as well.In order to use EM Express, a database user needs to have been granted the EM_EXPRESS_BASIC or EM_EXPRESS_ALL role.The DBA role includes both the EM_EXPRESS_BASIC and the EM_EXPRESS_ALL roles.Composite Active Reports are a significant enhancement to the Active Report technology introduced in Oracle Database 11g.For more information, see the section on Composite Active Reports.From this list, you can now select an instance and navigate to the Performance Hub, the Instance Home Page, or the Memory Page for the selected instance.