Complete configuration tasks after you install Oracle Database.

You are required to complete some configuration tasks after Oracle Database is installed. In addition, Oracle recommends that you complete additional tasks immediately after installation. You must also complete product-specific configuration tasks before you use those products.

• Required Postinstallation Tasks
  Download and apply required patches for your software release after completing your initial installation.
• Recommended Postinstallation Tasks
  Oracle recommends that you complete these tasks after installation.
• About Changes in Default SGA Permissions for Oracle Database
  Starting with Oracle Database 12c Release 2 (12.2.0.1), by default, permissions to read and write to the System Global Area (SGA) are limited to the Oracle software installation owner.
• Checking Installed Oracle Database Contents and Directory Location
  Use these steps to check the contents and directory location of an Oracle Database installation:
• Enabling and Disabling Oracle Database Options After Installation
  The chopt tool changes your database options after installation.
• Starting Oracle Enterprise Manager Database Express
  Use these steps to log in to Oracle Enterprise Manager Database Express (EM Express).
• Creating a Fast Recovery Area
  During an Oracle Restart installation, you can create only one disk group. During an Oracle Clusterware installation, you can create multiple disk groups. If you plan to add an Oracle Database for a standalone server or an Oracle RAC database, then you should create the fast recovery area for database files.
• Cloning an Oracle Database Home
  Cloning an Oracle home involves creating a copy of the Oracle home and then configuring it for a new environment.