ODBC connect to SQL Server 2005 from Oracle 10.2.0.3 32bit Linux

Question

I’m unable to establish a connection from Oracle 10.2.0.3 32bit Linux to SQL Server 2005.
The ODBC driver is the 32bit DataDirect 5.3 drivers and when I do a status on the listener it does have a handler for SQLDB
Any help is appreciated.
Received the following error:
SQL> select count(*) from columns@SQLDB;
select count(*) from columns@SQLDB
ERROR at line 1:
ORA-28500: connection from ORACLE to a non-Oracle system returned this message:
[Generic Connectivity Using ODBC]DRV_InitTdp: DB_ODBC_INTERFACE (718): ; [C077]
Could not find symbol 'SQLAllocConnect' in dynamic library
DB_ODBC_INTERFACE (722): ; [C079] Failed to load dynamic library
'/app/DataDirect/lib/libodbc.so'
ORA-02063: preceding 3 lines from SQLDB
-----Contents of trace file------------------
Oracle Corporation --- THURSDAY JUL 10 2008 10:17:16.251
Version 10.2.0.3.0
hoagprd (2): ; hoagprd Entered.
HOACONN.C (244): ; [Generic Connectivity Using ODBC] version: 4.8.2.0.0080
HOACONN.C (288): ; Class version: 250
hoagprd (2): ; hoagprd Exited with retcode = 0.
hoainit (3): ; hoainit Entered.
(0): ; connect string is: defTdpName=SQLDB;SYNTAX=(ORACLE8_HOA, BASED_ON=
ORACLE8, IDENTIFIER_QUOTE_CHAR="", CASE_SENSITIVE=CASE_SENSITIVE_QUOTE);
BINDING=<navobj><binding><datasources><datasource name='SQLDB' type='GENERIC_
ODBC_FOR_HS' connect='SQLDB'><driverProperties/></datasource></datasources><
remoteMachines/><environment><optimizer noFlattener='true'/><misc
year2000Policy='-1' consumerApi='1' sessionBehavior='4'/><queryProcessor
parserDepth='2000' tokenSize='1000' noInsertParameterization='true'
noThreadedReadAhead='true' noCommandReuse='true'/><debug driverTrace='true'
generalTrace='true'/></environment></binding></navobj>
ORACLE GENERIC GATEWAY Log File Started at 2008-07-10T10:17:16
hoainit (3): ; hoainit Exited with retcode = 0.
hoalgon (7): ; hoalgon Entered. name = dbuser.
sysbase.c (677): ; libodbcinst.so: cannot open shared object file: No such
file or directory
DB_ODBC_INTERFACE (718): ; [C077] Could not find symbol 'SQLAllocConnect' in
dynamic library
DB_ODBC_INTERFACE (722): ; [C079] Failed to load dynamic library '/app/
DataDirect/lib/libodbc.so'
DB_ODBC_INTERFACE (727): ; [C077] Could not find symbol 'SQLAllocConnect' in
dynamic library
DRV_InitTdp: DB_ODBC_INTERFACE (718): ; [C077] Could not find symbol '
SQLAllocConnect' in dynamic library
DB_ODBC_INTERFACE (722): ; [C079] Failed to load dynamic library '/app/
DataDirect/lib/libodbc.so'
nvRETURN (./drv_bind.c 230): -2220
nvRETURN (./nav_bind.c 298): -2220
hoalgon (7): ; hoalgon Exited with retcode = 28500.
hoaexit (6): ; hoaexit Entered.
hoaexit (6): ; hoaexit Exited with retcode = 0.
(0): ; Closing log file at THU JUL 10 10:17:16 2008.
--------------end of trace file ---------------
--------TNS entry ----------
SQLDB=
(DESCRIPTION =
(ADDRESS =(PROTOCOL = TCP)
(Host = oracledbhost)
(Port = 1521)
(CONNECT_DATA = (SID =SQLDB)
(HS=OK)
-------Listener.ora entry----------
(SID_DESC=
(SID_NAME=SQLDB)
(ORACLE_HOME=/app/oracle10g/product/10.2)
(PROGRAM=hsodbc)
-------initSQLDB.ora----------
# This is a sample agent init file that contains the HS parameters that are
# needed for an ODBC Agent.
# HS init parameters
HS_FDS_CONNECT_INFO = SQLDB
HS_FDS_TRACE_LEVEL = 4
HS_FDS_TRACE_FILE_NAME=/app/DataDirect/SQLDB.trc
HS_FDS_SHAREABLE_NAME=/app/DataDirect/lib/libodbc.so
# ODBC specific environment variables
set ODBCINI=/app/DataDirect/odbc.ini
------odbc.ini entry------------
[SQLDB]
Driver=/app/DataDirect/lib/ivmsss23.so
Description=DataDirect 5.2 SQL Server Wire Protocol
Address=SQLServerhost,1401
AlternateServers=
AnsiNPW=Yes
ConnectionRetryCount=0
ConnectionRetryDelay=3
Database=SQLServerDB
LoadBalancing=0
LogonID=
Password=
QuotedId=No
SnapshotSerializable=0

Answer 1

The error message is indicating problems loading the driver manager.
A common issue on Linux (especially on Suse Linux) is related to library caching. First of all make sure you add the LD_LIBRARY_PATH to your listener.ora file to guarantee the correct libraries will be loaded. Your SID section will then look like:
(SID_DESC=
(SID_NAME=SQLDB)
(ORACLE_HOME=/app/oracle10g/product/10.2)
(ENVS=LD_LIBRARY_PATH=/app/oracle10g/product/10.2/lib:/app/DataDirect/lib)
(PROGRAM=hsodbc)
After changing the listener.ora file stop and start the listener.
Details about the set up can be found in Metalink note:
Note.264567.1 P216. How To Setup Generic Connectivity - HSODBC - on Linux
If this does not help enable strace and check out from which location libodbc.so is being loaded.
Please be also aware HSODBC has been desupported 15th of March. As you start a new project you should proceed with the follow up product DG4ODBC.