If you have not read or heard about CDB or PDB I recommend a few references below.
Create Container Database using DBCA
2. Select create database click next
3. Here you can select to create database with default options or choose advance mode to have more control over how the database is created. Click next
In my case I choose advance mode.
In my case I like to choose custom database. Note: the template called testdbs is one I created not one of Oracle's templates.
In my case I choose to create CDB empty.
In my case I left blank.
Since this is a test lab we are not concern with the password.
See 9.1 for multiplex of redo and controlfile.
In my case I am going to use ASM for both the datafiles and recovery related files
In my case I provided to different ASM diskgroups.
In my case I will not set these security options.
Set memory option if you will use AMM or preset SGA/PGA
Set block size and processes
Set the character set as needed note best practice is to set Unicode (AL32UTF8)
Set the connection mode to be used
Once complete with the initialization parameters click next
Select create database and click next
If you would like to see a video of the database CDB creation click my YouTube video below.
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References:Oracle Database 12c Multitenant Architecture Overview
Install Oracle 12c (12.1) + New Features and Tips
Oracle 12c Documentation Library