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Don Burleson Blog 







nls_characterset location

Oracle Tips by Donald BurlesonApril 3, 2017

Question: I am getting the PLS-553: character set name is not recognized error, and I need to know the location and setting for nls_characterset.


Answer:  The nls_characterset parameter controls the character set used in the database.  The nls_characterset is normally created when the database is created and it can be viwed with the v$nls_parameters view:

select *
   parameter in ('NLS_CHARACTERSET');

You can also see your nls_characterset with this query:


To change the nls_characterset you can execute an alter database command, but beware that this can make your data corrupt:

alter database character set AL32UTF8;

You must then bounce the database for the change to take effect.  It is also a best practice to take a full backup before changing nls_characterset.


Also see these related notes on nls_characterset

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