What is Deprecation of Non-CDB Architecture means
Please check the below
link for point (8.1.1 : Deprecation
of Non-CDB Architecture).
"Deprecation"
means "at some stage in future, Oracle *might* stop doing enhancements on
this features, and at some stage after that, Oracle *might* no longer support
it".
In 12.1.0.1.0 non-CDB
(old architecture) is not deprecated whereas from 12.1.0.2.0 it got deprecated.
Even if you have single database, it is better to have it in multitenant
architecture as 1CDB and 1PDB.
Deprecation of Non-CDB Architecture
The non-CDB
architecture was deprecated in Oracle Database 12c. It can be desupported and
unavailable in a release after Oracle Database 19c .
Oracle recommends use
of the CDB architecture.
Oracle Database 19c ?
Release 12.2: New
releases will be annual and the version will be the last two digits of the
release year. The release originally planned as 12.2.0.2 will now be release
18c, and the release originally planned as 12.2.0.3 will be release 19c.
Releases 18c and 19c will be treated as under the umbrella of 12.2 for Lifetime
Support purposes. The current plan is for Oracle Database 19c to be the last
release for 12.2. This may change in the future to Oracle 20 as the last
release for 12.2