Oracle Database Discussions

Hi all,
i´m tryng to create a dblink between Oracle 10.2.0 and MySQL,
when when i try using sqlplus i obtain this error:
SQL> SELECT "id" FROM issues@mysqldb;

ORA-28500: la conexion de ORACLE a un sistema no Oracle ha devuelto este mensaje:
[Generic Connectivity Using ODBC]DRV_InitTdp: DB_ODBC_INTERFACE (2082): ; [MySQL][ODBC 5.1 Driver]Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2) (SQL State: 08S01; SQL Code: 2002)
ORA-02063: 2 lines precediendo a MYSQLDB
This is my configuration:

-------
/usr/lib/oracle/xe/app/oracle/product/10.2.0/server/hs/admin/initmysqldb.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 = hsqldb
HS_FDS_TRACE_LEVEL = DEBUG
HS_FDS_TRACE_FILE_NAME = mysqldb.trc
HS_OPEN_CURSORS=300
HS_AUTOREGISTER = TRUE
HS_FDS_SHAREABLE_NAME=/usr/lib/libmyodbc5.so
set ODBCINI=/usr/local/etc/odbc.ini

#
# Environment variables required for the non-Oracle system
#
#set <envvar>=<value>
-------
/usr/lib/oracle/xe/app/oracle/product/10.2.0/server/network/admin/listener.ora
-------
# listener.ora Network Configuration File:

SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /usr/lib/oracle/xe/app/oracle/product/10.2.0/server)
(PROGRAM = extproc)
)
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = /usr/lib/oracle/xe/app/oracle/product/10.2.0/server)
(PROGRAM = extproc)
)
(SID_DESC =
(SID_NAME = mysqldb)
(ORACLE_HOME = /usr/lib/oracle/xe/app/oracle/product/10.2.0/server)
(PROGRAM = hsodbc)
)
)

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
(ADDRESS = (PROTOCOL = TCP)(HOST = descordel01)(PORT = 1521))
)
)

DEFAULT_SERVICE_LISTENER = (XE)
-----------
/usr/lib/oracle/xe/app/oracle/product/10.2.0/server/network/admin/tnsnames.ora
----------
# tnsnames.ora Network Configuration File:

XE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = descordel01)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = XE)
)
)

EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
)
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
)
)

ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
)
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
)
)

mysqldb =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = descordel01)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = mysqldb)
)
(HS = OK)
)