Unless you specified that only the Oracle Database software should be installed, Oracle Universal Installer (OUI) automatically runs Database Configuration Assistant (DBCA) after software installation is complete. DBCA then creates a database using the information you provided. If you do not create a starter database and later want to create one, or to create additional databases, use DBCA.
Note:
With Oracle Database, you typically have a single database that hosts multiple applications. You do not need multiple databases to run different applications. Instead, you can separate the objects that support each different application into different schemas in the same database. However, there may be situations in which you want to create multiple Oracle databases on the same host computer. When you do this with DBCA, the new databases typically use the same Oracle home directory as the first database, but store database data files separately from those of the first database.
DBCA also enables you to modify a database configuration, delete a database, and more. You can perform the following DBCA tasks:
Online Help is available by clicking Help. It provides information that guides you in selecting configuration options.