How to modify oracle character set

To modify the Oracle character set, you can follow these steps: Modify the database character set: ALTER DATABASE CHARACTER SET Modify the table or column character set: ALTER TABLE

MODIFY

How to modify Oracle character set

Oracle databases use character sets to store and process data. Character sets define how characters are encoded in the database. In some cases, it may be necessary to modify the character set of a database or a specific table or column.

Modify database character set

To modify the database character set, follow these steps:

1. Connect to the database.
2. Run the following statement:

 <code>ALTER DATABASE CHARACTER SET </code>

For example, to change the database character set to UTF-8, run the following statement:

 <code>ALTER DATABASE CHARACTER SET UTF8</code>

3. Confirm the changes:

 <code>SELECT value FROM v$nls_database_parameters WHERE parameter = 'NLS_CHARACTERSET'</code>

Modify table or column character set

To modify a table or column character set, follow these steps:

1. Connect to the database.
2. Run the following statement:

 <code>ALTER TABLE  MODIFY  </code>

For example, to change the character set of column "my_column" in a table named "my_table" to UTF-8, run the following statement:

 <code>ALTER TABLE my_table MODIFY my_column UTF8</code>

3. Confirm the changes:

 <code>SELECT character_set_name FROM user_tab_cols WHERE table_name = 'my_table' AND column_name = 'my_column'</code>

Things to note

• Modifying the character set is a destructive operation that requires careful operation.
• Before changing the character set, it is highly recommended to back up the database.
• Character set changes can affect the application, so it is crucial to test the application before making the change.

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