Oracle Error ORA-22835: Buffer too small for CLOB to CHAR or BLOB to RAW conversion (actual: string, maximum: string)

Oracle Error Message

ORA-22835: Buffer too small for CLOB to CHAR or BLOB to RAW conversion (actual: string, maximum: string)

Reason for the Error

An attempt was made to convert CLOB to CHAR or BLOB to RAW, where the LOB size was bigger than the buffer limit for CHAR and RAW types. Note that widths are reported in characters if character length semantics are in effect for the column, otherwise widths are reported in bytes.

Solution

Do one of the following:

1. Make the LOB smaller before performing the conversion, for example, by using SUBSTR on CLOB

2. Use DBMS_LOB.SUBSTR to convert CLOB to CHAR or BLOB to RAW.