Migration from 9i to 11g Transparent Gateway results in a) ORA-12704: character set mismatch b) ORA-02070: database ... does not support SYS_OP_C2C in this context

Question

Migration from 9i to 11g Transparent Gateway results in a) ORA-12704: character set mismatch b) ORA-02070: database ... does not support SYS_OP_C2C in this context
What Transparent Gateway (TG) 11g configuration steps prevent the following errors?:
a) ORA-12704: character set mismatch
b) ORA-02070: database <DB_link_name> does not support SYS_OP_C2C in this context
Hints:
The current 9i TG works with the existing views and packages.  These same db objects will not compile using the new 11g TG.
The db objects are on an Oracle 10g database linked to an SQL Server 2008 R2 database.
Since the 9i TG works I assume a configuration to the 11g TG will get it working same as before.  But what...
Is is something controlled by these parameters?  (Sorry, I don't know how this stuff works.  I'm the application developer.  My DBAs setup the Transparent Gateways.):
  Parameters in the Gateway Startup Shell script:
    ORA_NLS33
    NLS_LANG
  Parameters in the initsid.ora file:
    HS_LANGUAGE
    HS_NLS_DATE_FORMAT
    HS_NLS_DATE_LANGUAGE
I'm avoiding the known workaround to refactor the VIEWS and PACKAGES to contain CAST() statements to explicitly match the data types.  A server side fix to the 11g TG is preferred. 
Sample code:
a) ORA-12704: character set mismatch
   ... is caused by SQL that works with my 9i TG but not with my 11g TG.  It's a snippit from my view that won't compile:
                  select status_code                  -- Oracle VARCHAR2(30)
                  from   ora_app_interfaces
                 UNION
                  select "StatusCode" as status_code  -- SQL Server NVARCHAR(30)
                  from   SqlAppInterfaces
   Example workaround that I'm avoiding:
                  select status_code
                  from   ora_app_interfaces
                 UNION
                  select CAST("StatusCode" as VARCHAR(30)) as status_code
                  from   SqlAppInterfaces
b) ORA-02070: database <DB_link_name> does not support SYS_OP_C2C in this context
   A line of code in the procedure that compiles correctly but fails to execute:
           -- Insert into SQL Server from Oracle
           insert into PatientMedRecNum ( 
              "PatID",         -- SQL Server INT
              "MedRecNum",     -- SQL Server NVARCHAR(11)
              "Hospital")      -- SQL Server NVARCHAR(30)
           values (
              pi_pat_id,       -- Oracle NUMBER
              pi_med_rec_num,  -- Oracle VARCHAR2
              pi_hospital);    -- Oracle VARCHAR2
I'd guess the errors are caused by the TG's implicit conversion between the Oracle VARCHAR2 and the SQL Server NVARCHAR... but this works fine on the 9i TG... how do I set it up to work on the 11g TG? 
Thanks!

Answer 1

Trace of 11g TG... generating errors due to lack of automatic mapping from SQL NVARCHAR to Oracle NVARCHAR, where the previous 9g TG mapped from SQL NVARCHAR to Oracle VARCHAR2.
Oracle Corporation --- MONDAY    SEP 22 2014 13:35:08.186
Heterogeneous Agent Release
11.2.0.4.0
Oracle Corporation --- MONDAY    SEP 22 2014 13:35:08.186
Version 11.2.0.4.0
Entered hgogprd
HOSGIP for "HS_FDS_TRACE_LEVEL" returned "DEBUG"
Entered hgosdip
setting HS_OPEN_CURSORS to default of 50
setting HS_FDS_RECOVERY_ACCOUNT to default of "RECOVER"
setting HS_FDS_RECOVERY_PWD to default value
setting HS_FDS_TRANSACTION_LOG to default of HS_TRANSACTION_LOG
setting HS_IDLE_TIMEOUT to default of 0
setting HS_FDS_TRANSACTION_ISOLATION to default of "READ_COMMITTED"
setting HS_NLS_NCHAR to default of "UCS2"
setting HS_FDS_TIMESTAMP_MAPPING to default of "DATE"
setting HS_FDS_DATE_MAPPING to default of "DATE"
setting HS_RPC_FETCH_REBLOCKING to default of "ON"
setting HS_FDS_FETCH_ROWS to default of "100"
setting HS_FDS_RESULTSET_SUPPORT to default of "FALSE"
setting HS_FDS_RSET_RETURN_ROWCOUNT to default of "FALSE"
setting HS_FDS_PROC_IS_FUNC to default of "FALSE"
setting HS_FDS_MAP_NCHAR to default of "TRUE"
setting HS_NLS_DATE_FORMAT to default of "YYYY-MM-DD HH24:MI:SS"
setting HS_FDS_REPORT_REAL_AS_DOUBLE to default of "FALSE"
setting HS_LONG_PIECE_TRANSFER_SIZE to default of "65536"
setting HS_SQL_HANDLE_STMT_REUSE to default of "FALSE"
setting HS_FDS_QUERY_DRIVER to default of "FALSE"
setting HS_FDS_SUPPORT_STATISTICS to default of "TRUE"
setting HS_FDS_QUOTE_IDENTIFIER to default of "TRUE"
setting HS_KEEP_REMOTE_COLUMN_SIZE to default of "OFF"
setting HS_FDS_GRAPHIC_TO_MBCS to default of "FALSE"
setting HS_FDS_MBCS_TO_GRAPHIC to default of "FALSE"
setting HS_CALL_NAME_ISP to "gtw$:SQLTables;gtw$:SQLColumns;gtw$:SQLPrimaryKeys;gtw$:SQLForeignKeys;gtw$:SQLProcedures;gtw$:SQLStatistics;gtw$:SQLGetInfo"
setting HS_FDS_DELAYED_OPEN to default of "TRUE"
setting HS_FDS_WORKAROUNDS to default of "0"
setting HS_FDS_ARRAY_EXEC to default of "TRUE"
Exiting hgosdip, rc=0
ORACLE_SID is "xxxDEV"
Product-Info:
  Port Rls/Upd:4/0 PrdStat:0
Agent:Oracle Database Gateway for MSSQL
Facility:hsa
Class:MSSQL, ClassVsn:11.2.0.4.0_0019, Instance:xxxDEV
Exiting hgogprd, rc=0
Entered hgoinit
HOCXU_COMP_CSET=1
HOCXU_DRV_CSET=178
HOCXU_DRV_NCHAR=1000
HOCXU_DB_CSET=178
HS_LANGUAGE not specified
rc=1239980 attempting to get LANG environment variable.
HOCXU_SEM_VER=102000
Entered hgolofn at 2014/09/22-13:35:08
RC=-1 from HOSGIP for "PATH"
Setting PATH to "C:\oracle\product\11.2.0\tg_2\dg4msql\driver\lib"
Exiting hgolofn, rc=0 at 2014/09/22-13:35:08
HOSGIP for "HS_OPEN_CURSORS" returned "50"
HOSGIP for "HS_FDS_FETCH_ROWS" returned "100"
HOSGIP for "HS_LONG_PIECE_TRANSFER_SIZE" returned "65536"
HOSGIP for "HS_NLS_NUMERIC_CHARACTER" returned ".,"
HOSGIP for "HS_KEEP_REMOTE_COLUMN_SIZE" returned "OFF"
HOSGIP for "HS_FDS_DELAYED_OPEN" returned "TRUE"
HOSGIP for "HS_FDS_WORKAROUNDS" returned "0"
HOSGIP for "HS_FDS_MBCS_TO_GRAPHIC" returned "FALSE"
HOSGIP for "HS_FDS_GRAPHIC_TO_MBCS" returned "FALSE"
treat_SQLLEN_as_compiled = 1
Exiting hgoinit, rc=0 at 2014/09/22-13:35:08
Entered hgolgon at 2014/09/22-13:35:08
reco:0, name:abaccess, tflag:0
Entered hgosuec at 2014/09/22-13:35:08
uencoding=UTF16
Entered shgosuec at 2014/09/22-13:35:08
Exiting shgosuec, rc=0 at 2014/09/22-13:35:08
shgosuec() returned rc=0
Exiting hgosuec, rc=0 at 2014/09/22-13:35:08
HOSGIP for "HS_FDS_RECOVERY_ACCOUNT" returned "RECOVER"
HOSGIP for "HS_FDS_TRANSACTION_LOG" returned "HS_TRANSACTION_LOG"
HOSGIP for "HS_FDS_TIMESTAMP_MAPPING" returned "DATE"
HOSGIP for "HS_FDS_DATE_MAPPING" returned "DATE"
HOSGIP for "HS_FDS_MAP_NCHAR" returned "TRUE"
HOSGIP for "HS_FDS_RESULTSET_SUPPORT" returned "FALSE"
HOSGIP for "HS_FDS_RSET_RETURN_ROWCOUNT" returned "FALSE"
HOSGIP for "HS_FDS_PROC_IS_FUNC" returned "FALSE"
HOSGIP for "HS_FDS_REPORT_REAL_AS_DOUBLE" returned "FALSE"
HOSGIP for "HS_FDS_DEFAULT_OWNER" returned "dbo"
HOSGIP for "HS_SQL_HANDLE_STMT_REUSE" returned "FALSE"
Entered hgocont at 2014/09/22-13:35:08
HS_FDS_CONNECT_INFO = "sqlserverxxx/sqlinstancexxx/SQL_Server_2008_xxx_DEV"
RC=-1 from HOSGIP for "HS_FDS_CONNECT_STRING"
Entered hgogenconstr at 2014/09/22-13:35:08
dsn: sqlserverxxx/sqlinstancexxx/SQL_Server_2008_xxx_DEV, name:xxx_admin
optn:
Entered hgocip at 2014/09/22-13:35:08
dsn:sqlserverxxx/sqlinstancexxx/SQL_Server_2008_xxx_DEV
Exiting hgocip, rc=0 at 2014/09/22-13:35:08
Entered shgogohn at 2014/09/22-13:35:08
ohn is 'OraGtw11g_home2'
Exiting shgogohn, rc=0 at 2014/09/22-13:35:08
RC=-1 from HOSGIP for "HS_FDS_ENCRYPT_SESSION"
using 0 as default value for "HS_FDS_ENCRYPT_SESSION"
RC=-1 from HOSGIP for "HS_FDS_VALIDATE_SERVER_CERT"
using 1 as default value for "HS_FDS_VALIDATE_SERVER_CERT"
Entered hgocont_OracleCsidToIANA at 2014/09/22-13:35:08
Returning 2252
Exiting hgocont_OracleCsidToIANA at 2014/09/22-13:35:08
Exiting hgogenconstr, rc=0 at 2014/09/22-13:35:08
Entered hgopoer at 2014/09/22-13:35:08
hgopoer, line 231: got native error 5701 and sqlstate 01000; message follows...
[Oracle][ODBC SQL Server Wire Protocol driver][Microsoft SQL Server]Changed database context to 'Xxx_XXX_DEV'. {01000,NativeErr = 5701}[Oracle][ODBC SQL Server Wire Protocol driver][Microsoft SQL Server]Changed language setting to us_english. {01000,NativeErr = 5703}
Exiting hgopoer, rc=0 at 2014/09/22-13:35:08
hgocont, line 2764: calling SqlDriverConnect got sqlstate 01000
Entered hgolosf at 2014/09/22-13:35:08
Exiting hgolosf, rc=0 at 2014/09/22-13:35:08
DriverName:HGmsss23.dll, DriverVer:07.01.0093 (B0098, U0065)
DBMS Name:Microsoft SQL Server, DBMS Version:10.00.2531
Exiting hgocont, rc=0 at 2014/09/22-13:35:08 with error ptr FILE:hgocont.c LINE:2764 ID:SQLDriverConnect
SQLGetInfo returns Y for SQL_CATALOG_NAME
SQLGetInfo returns 128 for SQL_MAX_CATALOG_NAME_LEN
Exiting hgolgon, rc=0 at 2014/09/22-13:35:08
Entered hgoulcp at 2014/09/22-13:35:08
Entered hgowlst at 2014/09/22-13:35:08
Exiting hgowlst, rc=1 at 2014/09/22-13:35:08
SQLGetInfo returns Y for SQL_PROCEDURES
SQLGetInfo returns 0x1f for SQL_OWNER_USAGE
TXN Capable:2, Isolation Option:0xf
SQLGetInfo returns 128 for SQL_MAX_SCHEMA_NAME_LEN
SQLGetInfo returns 128 for SQL_MAX_TABLE_NAME_LEN
SQLGetInfo returns 134 for SQL_MAX_PROCEDURE_NAME_LEN
HOSGIP returned value of "TRUE" for HS_FDS_QUOTE_IDENTIFIER
SQLGetInfo returns " (0x22) for SQL_IDENTIFIER_QUOTE_CHAR
13 instance capabilities will be uploaded
capno:1992, context:0x0001ffff, add-info:        0
capno:3042, context:0x00000000, add-info:        0, translation:"42"
capno:3047, context:0x00000000, add-info:        0, translation:"57"
capno:3049, context:0x00000000, add-info:        0, translation:"59"
capno:3050, context:0x00000000, add-info:        0, translation:"60"
capno:3066, context:0x00000000, add-info:        0
capno:3067, context:0x00000000, add-info:        0
capno:3068, context:0x00000000, add-info:        0
capno:3069, context:0x00000000, add-info:        0
capno:3500, context:0x00000001, add-info:       91, translation:"42"
  capno:3501, context:0x00000001, add-info:       93, translation:"57"
capno:3502, context:0x00000001, add-info:      107, translation:"59"
capno:3503, context:0x00000001, add-info:      110, translation:"60"
Exiting hgoulcp, rc=0 at 2014/09/22-13:35:08
Entered hgouldt at 2014/09/22-13:35:08
NO instance DD translations were uploaded
Exiting hgouldt, rc=0 at 2014/09/22-13:35:08
Entered hgobegn at 2014/09/22-13:35:08
tflag:0 , initial:1
hoi:0x12ee18, ttid (len 32) is ...
  xxx
  xxx
tbid (len 10) is ...
  0: 09000F00 0FAC1E00 010A [..........]
Exiting hgobegn, rc=0 at 2014/09/22-13:35:08
Entered hgodtab at 2014/09/22-13:35:08
count:1
  table: XXX_INTERFACE
Allocate hoada[0] @ 0000000005F58270
Entered hgopcda at 2014/09/22-13:35:08
Column:1(InterfaceID): dtype:2 (NUMERIC), prc/scl:20/0, nullbl:0, octet:0, sign:1, radix:10
Exiting hgopcda, rc=0 at 2014/09/22-13:35:08
Entered hgopcda at 2014/09/22-13:35:08
Column:2(TableName): dtype:-9 (WVARCHAR), prc/scl:30/0, nullbl:0, octet:60, sign:1, radix:0
Exiting hgopcda, rc=0 at 2014/09/22-13:35:08
Entered hgopcda at 2014/09/22-13:35:08
Column:3(TableID): dtype:4 (INTEGER), prc/scl:10/0, nullbl:0, octet:0, sign:1, radix:10
Exiting hgopcda, rc=0 at 2014/09/22-13:35:08
Entered hgopcda at 2014/09/22-13:35:08
Column:4(StatusCode): dtype:-9 (WVARCHAR), prc/scl:30/0, nullbl:0, octet:60, sign:1, radix:0
Exiting hgopcda, rc=0 at 2014/09/22-13:35:08
Entered hgopcda at 2014/09/22-13:35:08
Column:5(StatusTimestamp): dtype:93 (TIMESTAMP), prc/scl:23/3, nullbl:0, octet:0, sign:1, radix:0
Exiting hgopcda, rc=0 at 2014/09/22-13:35:08
Entered hgopcda at 2014/09/22-13:35:08
Column:6(InterfaceLog): dtype:-9 (WVARCHAR), prc/scl:400/0, nullbl:1, octet:800, sign:1, radix:0
Exiting hgopcda, rc=0 at 2014/09/22-13:35:08
The hoada for table XXX_INTERFACE follows...
hgodtab, line 1073: Printing hoada @ 0000000005F58270
MAX:6, ACTUAL:6, BRC:1, WHT=6 (TABLE_DESCRIBE)
hoadaMOD bit-values found (0x40:TREAT_AS_NCHAR,0x400:UNICODE_COLUMN)
DTY NULL-OK  LEN  MAXBUFLEN   PR/SC  CST IND MOD NAME
  3 DECIMAL N         22         22 20/  0    0   0   0 InterfaceID
12 VARCHAR N         60         60 128/ 30 1000   0 440 TableName
  4 INTEGER N          4 4   0/  0    0   0   0 TableID
12 VARCHAR N         60         60 128/ 30 1000   0 440 StatusCode
91 DATE N         16         16 0/  0    0   0   0 StatusTimestamp
12 VARCHAR Y        800        800 129/144 1000   0 440 InterfaceLog
Exiting hgodtab, rc=0 at 2014/09/22-13:35:08
Entered hgodafr, cursor id 0 at 2014/09/22-13:35:08
Free hoada @ 0000000005F58270
Exiting hgodafr, rc=0 at 2014/09/22-13:35:08
Entered hgotcis at 2014/09/22-13:35:08
Calling SQLStatistics for XXX_INTERFACE
IndexType=SQL_TABLE_STAT: cardinality=0
IndexType=1: PK_XXX_Interface
IndexType=3: IX_TableID
IndexType=3: IX_TableName
Calling SQLColumns for dbo.SQL_app_INTERFACE
#1 Column "InterfaceID": dtype=2, colsize=20, decdig=0, char_octet_length=0, cumulative avg row len=15
#2 Column "TableName": dtype=-9, colsize=30, decdig=0, char_octet_length=60, cumulative avg row len=60
#3 Column "TableID": dtype=4, colsize=10, decdig=0, char_octet_length=0, cumulative avg row len=64
#4 Column "StatusCode": dtype=-9, colsize=30, decdig=0, char_octet_length=60, cumulative avg row len=109
#5 Column "StatusTimestamp": dtype=93, colsize=23, decdig=3, char_octet_length=0, cumulative avg row len=125
#6 Column "InterfaceLog": dtype=-9, colsize=400, decdig=0, char_octet_length=800, cumulative avg row len=725
3 Index(es) found:
  Index: PK_XXX_Interface, type=1, ASCENDING, UNIQUE, cardinality=0
#1 Column 1: InterfaceID
  Index: IX_TableID, type=3, ASCENDING, NON-UNIQUE, cardinality=0
#1 Column 3: TableID
  Index: IX_TableName, type=3, ASCENDING, NON-UNIQUE, cardinality=0
#1 Column 2: TableName
Exiting hgotcis, rc=0 at 2014/09/22-13:35:08