Steps to apply an application patch:

1. Stop all application services from your instance but need to be up and running by database and the database listener.
2. Download the patch from Metalink and carefully go through the README.txt file, if any pre-requisites requires, wrote down the order to apply and download these patches before start the application patch.
3. Copy the patch file(s) to any directory with full access to application user (i.e. /u01/apps/patches)
4. Login as APPLMGR (owner of application tier) and do the following:
5. Source the environment file
6. $ cd /u01/apps/patches
7. Type 'unzip  <patch_number>.zip'
8. cd  <patch_number>
9. Type 'adpatch'
10. When it prompts you to enter the patch driver, type 'u <patch_number>.drv'

Apply the patch on the database tier (concurrent + admin) first then on the application tier(s)

Do not forget to 'Enable Maintenance Mode' from adadmin before applying the patch. Once you apply the patch successfully, 'Disable Maintenance Mode' from adadmin.

To apply NLS patch:

1. Download the patch from Metalink
2. Copy the patch file to any directory with full access to application user (i.e. /u01/apps/patches)
3. Login as APPLMGR (owner of application tier) and do the following:
4. Source the environment file
5. $ cd /u01/apps/patches
6. Type 'unzip  <patch_number>_<lang>.zip'
7. cd  <patch_number>_<lang>
8. Type 'adpatch'
9. When it prompts you to enter the patch driver, type 'u <patch_number>.drv'

For more details about applying patches, please refer to

Oracle Applications Patching Procedures

"Oracle Applications Maintenance Utilities" manual

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