The illustration em_dbcontrol_dir_structure.gif consists of a diagram that shows a folder icon that represents the Oracle home directory created when you install an Oracle Database 10g database. Specifically, the illustrations shows the following directories inside the Oracle home:

• The bin directory, which contains the emctl and emca commands discussed later in this section

• The sysman directory, which contains the Enterprise Manager administration files

• The hostname_sid directory, which contains its own sysman directory. This sysman directory contains the Enterprise Manager configuration, logging, and administration files specific to the database identified in the hostname_sid directory name.

• The oc4j directory, which contains a j2ee directory, which contains the files required to deploy the Database Control application for each database instance you create in this Oracle home.