Can PDB have different character set?

In Oracle Database 12c Release 2 (12.2) a PDB can use a different character set to the CDB, provided the character set of the CDB is AL32UTF8, which is now the default character set when using the Database Configuration Assistant (DBCA).

What is Character Set WE8ISO8859P1?

Oracle character set WE8ISO8859P1 allows support for 8-bit characters. While this character set supports ASCII characters, not all ASCII code pages are the same. Note: Not all characters might be correctly displayed on all clients if the Oracle codepage is not updated to a supported codepage.

Can we change Nls_characterset?

To change the nls_characterset you can execute an alter database command, but beware that this can make your data corrupt: alter database character set AL32UTF8; You must then bounce the database for the change to take effect. It is also a best practice to take a full backup before changing nls_characterset.

How many PDBs can be in an CDB?

Fact: A CDB can contain up to 252 PDBs.

Is AL32UTF8 a superset of WE8MSWIN1252?

Because WE8MSWIN1252 is not a strict subset of AL32UTF8 this statement will fail (example: the pound sign is A3 in hex in WE8MSWIN1252 , but in AL32UTF8 it is C2 A3 ). You’ll need to use CSALTER to do this migration. Refer to: Character Set Migration.

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 should I use?

As a content author or developer, you should nowadays always choose the UTF-8 character encoding for your content or data. This Unicode encoding is a good choice because you can use a single character encoding to handle any character you are likely to need. This greatly simplifies things.

What is the difference between AL32UTF8 and UTF-8?

Aka AL32UTF8 has extra characters available but it has all the same as UTF8. But there is one important difference here. While UTF8 uses only 2 bytes to store data AL32UTF8 uses 2 or 4 bytes.

How do I change my character set in NLS?

Log in to sqplus as a DBA.

  1. SHUTDOWN IMMEDIATE;
  2. STARTUP RESTRICT;
  3. ALTER DATABASE CHARACTER SET INTERNAL_USE AL32UTF8;
  4. ALTER SYSTEM DISABLE RESTRICTED SESSION;
  5. select value from NLS_DATABASE_PARAMETERS where PARAMETER = ‘NLS_CHARACTERSET’;

Can we change NLS character set at session level?

You might want to modify the NLS environment dynamically during the session. To do so, you can use the ALTER SESSION statement to change NLS_LANGUAGE , NLS_TERRITORY , and other NLS parameters. Note: You cannot modify the setting for the client character set with the ALTER SESSION statement.

How many PDBs can you create?

Only the PDBs that are user created PDBs are counted, the PDB$SEED, Application Seed and Application Root are ignored from the count. By default this parameter’s value is 4098, which is also the maximum number of PDBs you can create in a CDB.

What is difference between CDB and PDB?

A CDB includes zero, one, or many customer-created pluggable databases (PDBs). A PDB is a portable collection of schemas, schema objects, and non-schema objects that appears to an Oracle Net client as a non-CDB . All Oracle databases before Oracle Database 12c were non-CDBs.