Oracle sort order changed

We recently deployed a new environment with a newer version of Oracle (12c) instead of 11r2. Only recently I noticed my data returned is sorted differently. Instead of having small letters, capital letters and numbers... (on Oracle 11r2) I get my data sorted the opposite way: numbers, capital letters, small letters (Oracle 12c) This is realy confusing the end-user of various applications querying the database. What settings do I need to check/compare to fix this problem in Oracle 12c? The queries I refer to have an order by clause. **EDIT** The settings on for these parameters are the same on both evironments: **NLS_SORT** type: string value: **nls_language** type: string value: DUTCH So there is no value for NLS_SORT, what is the default then? @phil select * from NLS_INSTANCE_PARAMETERS; Parameter Oracle11r2 Oracle12c NLS_LANGUAGE DUTCH DUTCH NLS_TERRITORY THE NETHERLANDS THE NETHERLANDS NLS_SORT NLS_DATE_LANGUAGE NLS_DATE_FORMAT NLS_CURRENCY NLS_NUMERIC_CHARACTERS NLS_ISO_CURRENCY NLS_CALENDAR NLS_TIME_FORMAT NLS_TIMESTAMP_FORMAT NLS_TIME_TZ_FORMAT NLS_TIMESTAMP_TZ_FORMAT NLS_DUAL_CURRENCY NLS_COMP BINARY BINARY NLS_LENGTH_SEMANTICS BYTE CHAR NLS_NCHAR_CONV_EXCP FALSE FALSE select * from NLS_SESSION_PARAMETERS; these are the same as my NLS settings in Oracle SQL developer, so not very relevant I guess... select * from NLS_DATABASE_PARAMETERS; These are the same, only NLS_RDBMS_VERSION differs So only NLS_LENGTH_SEMANTICS differs. Is there a way to check the values for other sessions?