What is the difference between UTF8 and AL32UTF8?

What is the difference between UTF8 and AL32UTF8?

UTF8 supports only Unicode version 3.1 and earlier; it does not support all valid XML characters. AL32UTF8 has no such limitation. Using database character set UTF8 for XML data could cause a fatal error or affect security negatively.

What is national character set in Oracle database?

The term national character set refers to an alternative character set that enables you to store Unicode character data in a database that does not have a Unicode database character set.

What is Oracle Csscan?

For 8i and 9i please do install Csscan version 1.2 , do not use the old csscan versions included in 8i/9i . The Csscan tool analyzes the code points in the database and verifies that they are known in the source the database characterset and known in the target database characterset.

What is DMU in Oracle?

Oracle Database Migration Assistant for Unicode (DMU) is a unique next-generation migration tool providing an end-to-end solution for migrating your databases from legacy encodings to Unicode.

What character set does the AL32UTF8 Oracle Database use?

The following figure shows a server that uses the AL32UTF8 Oracle Database character set that is based on the Unicode UTF-8 character set. Character conversion takes place between each client and the server except for the AL32UTF8 client, but there is no data loss because AL32UTF8 is a universal character set.

What is the difference between UTF-8 and UTF-16 in Oracle?

UTF-16: Each character is either 2 or 4 bytes long. UTF-8: Each character takes 1 to 4 bytes to store. Oracle Database provides support for UTF-8 as a database character set and both UTF-8 and UTF-16 as national character sets. Character set conversion between a UTF-8 database and any single-byte character set introduces very little overhead.

Because UTF8 and AL32UTF8 have different maximum character widths (three versus four bytes per character), the automatic change of UTF8 to AL32UTF8 during plug-in operation will change implicit maximum byte lengths of columns with character length semantics.

What is the default Unicode character set used in Oracle Database?

Starting from Oracle Database 12 c Release 2, if you use Oracle Universal Installer (OUI) or Oracle Database Configuration Assistant (DBCA) to create a database, then the default database character set used is the Unicode character set AL32UTF8. UTF-16: Each character is either 2 or 4 bytes long. UTF-8: Each character takes 1 to 4 bytes to store.