Question:
:
I am writing an RMAN backup and I get this ORA-12713 error:
RMAN-03009: failure of backup command on backup_1 channel at ...
ORA-12713: Character data loss in NCHAR/CHAR conversion Recovery
Manager complete.
How do I fix the ORA-12713 error?
Answer:
You start by using the
oerr utility to look-up the action for this error:
ORA-12713:
Character data loss in NCHAR/CHAR conversion
Cause: When character set conversion happens between CHAR and NCHAR
either implicitly or explicitly, some characters are lost due to no
mapping characters in the destination character set.
Action: Make sure all the characters can be mapped to
destination character set or set NLS_NCHAR_CONV_EXCP to be FALSE.
In RMAN, the ORA-12713 error is usually an issue with the use of
multi-byte character sets.
Your backup is writing to a disk that contains either
extended ASCII and/or multi-byte character sets.
In sum, those characters could not be successfully translated by
RMAN, causing the ORA-12713 error.
There are several solutions to the ORA-12713 error:
-
Migrate from from US7ASCII to WE8MSWIN1252
using the using CONVERT() utility. This will onvert you from a
narrow character set (eg UTF-8) to a wider set (UTF-16)
-
Set your initialization parameter
NLS_NCHAR_CONV_EXCP=FALSE
-
Direct your RMAN to write backup files to a
disk that only contains ASCII characters, the ORA-12713 will not
happen.
The Oracle documentation on
Exception Handling for Data Loss During Datatype Conversion has
full details on your conversion options:
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