What is downtime mode and
when can it be used?
To optimize the process
of upgrading to E-Business Suite Release 12.2, the AD Delta 5 Release Update
Pack introduced downtime mode, which is used as follows:
- $ adop phase=apply
patches=<patch_number> apply_mode=downtime
Downtime mode does not
use an online patching cycle.
The process of applying
a patch in downtime mode completes more quickly than in online mode, but at the
cost of increased system downtime.
When applying Oracle
E-Business Suite patches in this mode, adop will first confirm that the
application tier services are down, and will then proceed to apply the patch to
the run edition of the Oracle E-Business Suite database and file system.
Downtime mode is supported
for:
- All patching (including
post-upgrade patching) that forms part of the Release 12.2 upgrade process
and is completed before the system is scaled up, the application tier
services are started, and users log in to the upgraded system.
- Single-node development or test
environments, where production support and high availability are not
required.
Downtime mode allows the
12.2 upgrade process to be completed as quickly as possible.
Once the upgrade is
complete and users are online, all subsequent patching on a production system
should use online mode, not downtime mode, unless the patch readme states
otherwise.
Several restrictions
apply to the use of downtime mode:
- You cannot validate successful
patch application before cutover to the updated code takes place.
- There is no capability to abort
a failed patch and return to the existing run edition.
- Release 12.2 patches are not
normally tested in downtime mode.
- Use of downtime mode in a
multi-node application tier environment is not tested or supported.
Note: Downtime mode is only supported for production
use where explicitly documented, or otherwise directed by Oracle.