The following is the ORA-22998 error message, you can learn the cause and solution of the Oracle database error.
ORA-22998 CLOB or NCLOB in multibyte character set not supported
Cause: A CLOB or NCLOB in a fixed-width or varying-width multibyte character set was passed to a SQL character function which does not support multibyte LOB data.
Solution: Use DBMS_LOB functions such as DBMS_LOB.INSTR() and DBMS_LOB.SUBSTR() or use PLSQL DBMS_LOB.READ/WRITE to access LOB data.
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