1. Open a new terminal window and setup environment to run scripts on Application Tier (for more info see How to setup environment for Application Tier at linux terminal?)

2. Stop all application services from Application Tier (for more info see How to stop Application Tier in Oracle E Business Suite?)

3. Start 'adadmin' utility

cd $AD_TOP/bin

adadmin

It will ask you to provide couple of details such as your DB passwors, confirm your Apps directory etc.

4. Once you give above information, following adadmin menu will appear

AD Administration Main Menu
   --------------------------------------------------

   1.    Generate Applications Files menu

   2.    Maintain Applications Files menu

   3.    Compile/Reload Applications Database Entities menu

   4.    Maintain Applications Database Entities menu

   5.    Change Maintenance Mode

   6.    Exit AD Administration

5. Choose option 5 for 'Changing Maintenance Mode'

6. A new sub-menu will appear, wherein you choose option 1 for 'Enable Maintenance Mode'

How to Disable Maintenance Mode

1. Follow the above given steps (steps 1 to 5)

2. A new sub-menu will appear, wherein you choose option 1 for 'Disable Maintenance Mode'

Assumptions

• Database is up and running

Environment

• Oracle E Business Suite R12i
• Oracle Enterprise Linux 5.7