Home > tips > Defining database link by using Oracle Gateway

Defining database link by using Oracle Gateway

For configuring a remote non-Oracle database connections on Oracle gateway,
I followed below steps, hope this helps.

1) Create below file in the gateway, with appropriate values like the example below:
  Beware of the value of X in the file name: init<X>.ora
  X value will later be used in listener.ora file SID_NAME parameter.
  Beware of connect string line: HS_FDS_CONNECT_INFO=
  Ip,port and database name triple belongs to the remote sybase machine.

Server: Gateway
File name: /u01/app/oracle/product/11.1.0/dg4sybs/admin/initMYSYDB1.ora
# This is a sample agent init file that contains the HS parameters that are
# needed for the Transparent Gateway for Sybase
HS_FDS_TRACE_FILE_NAME = /tmp/dg4sybs_mysydb.trc
# Environment variables required for Sybase
set SYBASE=/u01/app/sybase
set LIBPATH=/u01/app/sybase/OCS-12_5/lib:/u01/app/sybase:/u01/app/oracle/product/11.1.0/lib


2) In the gateway machine (in my example host ip:, Enter lines in listener.ora file:
Server: Gateway
File name: /u01/app/oracle/product/11.1.0/network/admin/listener.ora

MYSYDB_1522 =
         (ADDRESS = (PROTOCOL = TCP)(HOST = (PORT = 1522))
    (SID_DESC =
      (SID_NAME = MYSYDB1)
      (ORACLE_HOME = /u01/app/oracle/product/11.1.0)
      (PROGRAM = dg4sybs)

3) Start the service by issueing below command:

lnsrctl start MYSYDB_1522

4) Enter TNS entry to Oracle server where you created dblink.
If it is RAC you must re-enter this information in all nodes. ip belongs to gateway server.

Server: Local DB(s)
File name: /u01/app/product/DB/network/admin/tnsnames.ora

    (ADDRESS = (PROTOCOL = tcp)(HOST = = 1522))
      (SID = MYSYDB1)
    (HS = OK)
5) Create dblink in the database side, using the tns entry in previous step:

 CONNECT TO “user1”
Troubleshooting :
 While testing with select * from dual@MYDBLINK;
 it was giving below error. This was because of a sybase side logon trigger.

 ORA-28500: connection from ORACLE to a non-Oracle system returned this message:
 [Oracle][ODBC Sybase Wire Protocol driver]Socket closed. {08S01}[Oracle][ODBC Sybase Wire Protocol driver]Sybase Network Connection has terminated. If a transaction was in progress it has been aborted. {08S01}[Oracle][ODBC Sybase Wire Protocol driver][Sybase ASE]Execution of login script ‘”sp_adm_check_int_users”‘ failed with last error = 11039. See server errorlog for details.
 {HY000,NativeErr = 1638}[Oracle][ODBC Sybase Wire Protocol driver]File not found ‘.odbc.ini’. {HY000,NativeErr = 1509}
 ORA-02063: preceding 3 lines from MYDBLINK

 sp_adm_check_int_users is a logon checking procedure, which authenticates conenctions according to source host ip/hostname.
2- You can check for any error logs in the following directory.
  -rw-r–r–    1 oracle   dba           11012 May 08 11:37 MYSYDB1_agt_65733070.trc
  -rw-r–r–    1 oracle   dba           11012 May 08 11:39 MYSYDB1_agt_59441834.trc
  -rw-r–r–    1 oracle   dba           11012 May 08 15:38 MYSYDB1_agt_54329962.trc
  -rw-r–r–    1 oracle   dba         2113496 May 09 19:05 MYSYDB1_agt_22414304.trc
  -rw-r–r–    1 oracle   dba           18585 May 10 15:46 MYSYDB1_agt_5701974.trc

3- You may get TNS error: ORA-12154: TNS:could not resolve the connect identifier specified
  In my case, it was I forgot to enter the tns entry in other node of the RAC.

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