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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.If you do not want to use AL32UTF8, and you are not restricted in your choice by a vendor requirement, then Oracle suggests that you use one of the character sets listed as recommended for the database.
Even if the database does not currently store multilingual data but is expected to store multilingual data within a few years, the choice of AL32UTF8 for the database character set is usually the only good decision.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.See Develop a backup and recovery strategy to protect the database from failure.It is important to protect the control file by multiplexing, to choose the appropriate backup mode, and to manage the online redo log and archived redo log files.You typically create a database during Oracle Database software installation.
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.
For example, you can place redo log files on separate disks or use striping. And you can control data density (number of rows to a data block).
If you create a Fast Recovery Area, Oracle recommends that you place it on a storage device that is different from that of the data files.
Reasons to create a database after installation are as follows: Database creation prepares several operating system files to work together as an Oracle Database.