How to set the NLS_LANG in GoldenGate

You need to set NLS_LANG when you run GoldenGate on the super-set character set for the database

you can see the NLS_LANG setting on the OS level

echo $NLS_LANG 
American_America.AL32UTF8

On the DB Side

it is the combination of below parameter, which will get it from NLS_DATABASE_PARAMETERS vuew
NLS_LANGUAGE_NLS_TERRITORY.NLS_CHARACTERSET

You can use the following commands to check the database character sets. (Each Database might have different setting; check your DB before you set this value)

col VALUE format a30
SQL> SELECT * from NLS_DATABASE_PARAMETERS; 

PARAMETER                      VALUE
------------------------------ ------------------------------
NLS_LANGUAGE                   AMERICAN
NLS_TERRITORY                  AMERICA
NLS_CURRENCY                   $
NLS_ISO_CURRENCY               AMERICA
NLS_NUMERIC_CHARACTERS         .,
NLS_CHARACTERSET               AL32UTF8
NLS_CALENDAR                   GREGORIAN
NLS_DATE_FORMAT                DD-MON-RR
NLS_DATE_LANGUAGE              AMERICAN
NLS_SORT                       BINARY
NLS_TIME_FORMAT                HH.MI.SSXFF AM
NLS_TIMESTAMP_FORMAT           DD-MON-RR HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT             HH.MI.SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT        DD-MON-RR HH.MI.SSXFF AM TZR
NLS_DUAL_CURRENCY              $
NLS_COMP                       BINARY
NLS_LENGTH_SEMANTICS           BYTE
NLS_NCHAR_CONV_EXCP            FALSE
NLS_NCHAR_CHARACTERSET         AL16UTF16
NLS_RDBMS_VERSION              11.2.0.3.0


20 rows selected.

Note:

1) if you set a wrong value; your data might be corrupted;

2) it might abended the Replicate process on the target.