AL32UTF8 is Oracle's name for the UTF-8 encoding of the Unicode standard.The Unicode standard is the universal character set that supports most of the currently spoken languages of the world.You can create a database using the noninteractive/silent mode of Database Configuration Assistant (DBCA).See the following documentation for details on using the noninteractive/silent mode of DBCA: Examples illustrate how to create a database with noninteractive/silent mode of Database Configuration Assistant (DBCA).The universality and flexibility of Unicode typically outweighs some additional cost associated with it, such as slightly slower text processing compared to single-byte character sets and higher storage space requirements for non-ASCII text compared to non-Unicode character sets.
However, you can also create a database after installation.
Despite having a very similar name, UTF8 is not a proper implementation of the Unicode encoding UTF-8.
If the UTF8 character set is used where UTF-8 processing is expected, data loss and security issues may occur.
This is especially true for Web related data, such as XML and URL addresses. If you use the Oracle Universal Installer, it will guide you through your installation and provide help in setting environment variables and establishing directory structure and authorizations.
Oracle strongly recommends using the Database Configuration Assistant (DBCA) to create a database, because it is a more automated approach, and your database is ready to use when DBCA completes.