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Don Burleson Blog 







ORA-29275: partial multibyte character tips

Oracle Database Tips by Donald BurlesonJuly 13, 2015


Question:  Am I getting the ORA-29275 error on a SQL query.  How can I find the affected rows and how to I fix the data to remove the ORA-29275 error?


Answer:  The oerr utility gives us this information on the ORA-29275 error:

ORA-29275: partial multibyte character

Cause: The requested read operation could not complete because a partial multibyte character was found at the end of the input.

Action: Ensure that the complete multibyte character is sent from the remote server and retry the operation. Or read the partial multibyte character as RAW.

The core issue of that the nls_chracterset values for the multibyte character set does not match between either two databases in a distributed query, or a query where the webserver has a different character set.  There are several possible fixes for the ORA-29275 error, all involving getting the NLS character sets to match:


1 - write a function to convert each row.  Place this function inside a PL/SQL function and call it for each row of the table:


2 - If you have a webserver, try setting the NLS_LANG environmental variable on the webserver to american_america.al32utf8.


See MOS Note 69518.1 - Storing and Checking Character Codepoints in an UTF8/AL32UTF8 (Unicode) database.

See MOS Note  788156.1 - AL32UTF8 / UTF8 (Unicode) Database Character Set Implications

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