How to solve garbled code in oracle

Oracle garbled problems can be solved by checking the database character set to ensure they match the data. Set the client character set to match the database. Convert data or modify column character sets to match database character sets. Use Unicode character sets and avoid multibyte character sets. Check that the language settings of the database and client are correct.

Garbage code solution in Oracle

Garbage code problems in Oracle are a common problem and can cause difficulties in database operations. Here are the steps to solve the Oracle garbled problem:

Check database character set

• Make sure the database's character set matches the character set of the data you want to import or write to.
• Check the database character set with the following command: SELECT * FROM V$NLS_PARAMETERS WHERE PARAMETER = 'NLS_CHARACTERSET';

Setting up client character set

• Make sure the character set of the client (such as SQL*Plus) matches the database character set.
• Set the client character set in SQL*Plus using the following command: ALTER SESSION SET NLS_CHARACTERSET='UTF8';

Convert data

• If the data is stored in a different character set, it needs to be converted to a character set that matches the database character set.

• You can use NLS_LANG environment variable or the CONVERT function to convert:

  • Set NLS_LANG environment variable: export NLS_LANG=AMERICAN_AMERICA.UTF8
  • Use the CONVERT function: SELECT CONVERT('中文', 'GB2312', 'AL32UTF8') FROM DUAL;

Modify column character set

• If the database character set is different from the data character set and the data cannot be converted, you can change the character set of the column.
• Change the column character set using the following command: ALTER TABLE table_name MODIFY column_name datatype CHARACTER SET charset_name;

Other tips

• Always use Unicode character sets (such as UTF-8) because it can support a wide range of characters.
• Avoid using multibyte character sets, as they can be difficult to manage.
• If the garbled problem still exists, please check whether the language settings of the database and client are correct.

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