Hello Rain ,

Oracle Descritption for this error is given below:
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.

Mainly reason for this type or ora error is that there is a junk/invisible or special character available ,but unfortunately the cause and action that oracle give it to us is not that much descriptive, so to investigate more and figure out the problem and fix it let’s try this:

First try to select columns individually like below example:

SELECT COL1 FROM TABLENAME;
SELECT COL2 FROM TABLENAME;

until reach to the column that causing your problem and raise this ORA error.

so far so good for now that we identified the column that has junk/invisible character we can fetch the column data and overcome this issue by using CONVERT function in oracle like below example :

SELECT CONVERT(COL1, ‘US7ASCII’, ‘WE8ISO8859P1’) FROM TABLENAME;

Hope that this answer was helpful.