integerated heterogeneous database(Mysql and oracle)

[swarnalath]

i am able to create database link at oracle. but i am getting error as
SQL> create public database link link2db connect to "swarna" identified by "root" using 'TSTLINK';

Database link created.

SQL> select * from "ss"@link2db;
select * from "ss"@link2db
*
ERROR at line 1:
ORA-28545: error diagnosed by Net8 when connecting to an agent
Unable to retrieve text of NETWORK/NCR message 65535
ORA-02063: preceding 2 lines from LINK2DB
my tnsnames.ora

XE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = SWARNALATHA)(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)
)
)
TSTLINK=
(DESCRIPTION=
(ADDRESS=
(PROTOCOL=TCP)
(HOST=LOCALHOST)
(port=1521)
)
(CONNECT_DATA=
(SID=tst)
(SERVICE_NAME=TSTLINK)
(SERVER=DEDICATED)
)
(HS=OK)
)

my listener.ora

SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc
(ORACLE_HOME = C:\oraclexe\app\oracle\product\10.2.0\server)
(PROGRAM = extproc)
)
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = C:\oraclexe\app\oracle\product\10.2.0\server)
(PROGRAM = extproc
)
)

SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = tst)
(ORACLE_HOME = C:\oraclexe\app\oracle\product\10.2.0\server)
(PROGRAM = dg4odbc)
)
)

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

DEFAULT_SERVICE_LISTENER = (XE)



my sqlnet.ora

n# This file is actually generated by netca. But if customers choose to
# install "Software Only", this file wont exist and without the native
# authentication, they will not be able to connect to the database on NT.

SQLNET.AUTHENTICATION_SERVICES = (NTS)

NAMES.DIRECTORY_PATH=(TNSNAMES,EZCONNECT)


Plzzz help me
Thanks in advance

[swarnalath]

Plzzz help me as soon as possible