Oracle connection from remote server where oracle client is installed not happening.

Hi ,
I am facing problem today , that i am not able to reach oracle DB from other machine where i have installed Oracle clinet few months ago. Same was heppeing till yesterday.
OS: Windows
Version: 11G
Oracle DB TNS:
# tnsnames.ora Network Configuration File: C:\app\oracluadmin\product\11.2.0\dbhome_1\NETWORK\ADMIN\tnsnames.ora
# Generated by Oracle configuration tools.
DFCCDB =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 10.199.4.130)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = dfccdb.dfcc.co.in)
ORACLR_CONNECTION_DATA =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    (CONNECT_DATA =
      (SID = CLRExtProc)
Output from DB server:
C:\Users\oracluadmin>tnsping DFCCDB
TNS Ping Utility for 64-bit Windows: Version 11.2.0.3.0 - Production on 28-JAN-2014 14:51:22
Copyright (c) 1997, 2011, Oracle. All rights reserved.
Used parameter files:
C:\app\oracluadmin\product\11.2.0\dbhome_1\network\admin\sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 10.199.4.130)(PORT = 1521))) (CONNECT_DATA = (SERVER
= DEDICATED) (SERVICE_NAME = dfccdb.dfcc.co.in)))
OK (0 msec)
C:\Users\oracluadmin>sqlplus SYS AS SYSDBA@DFCCDB
SQL*Plus: Release 11.2.0.3.0 Production on Tue Jan 28 14:56:15 2014
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Enter password:
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL>
Clinet server TNS:
DFCCDB =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 10.199.4.130)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = dfccdb.dfcc.co.in)
Output from client server:
C:\Users\gisadmin>tnsping DFCCDB
TNS Ping Utility for 64-bit Windows: Version 11.2.0.1.0 - Production on 28-JAN
014 15:06:18
Copyright (c) 1997, 2010, Oracle. All rights reserved.
Used parameter files:
C:\app\gisadmin\product\11.2.0\client_1\network\admin\sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TC
(HOST = 10.199.4.130)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = dfccdb.df
.co.in)))
OK (10 msec)
C:\Users\gisadmin>sqlplus SYS AS SYSDBA@DFCCDB
SQL*Plus: Release 11.2.0.1.0 Production on Tue Jan 28 15:06:36 2014
Copyright (c) 1982, 2010, Oracle. All rights reserved.
Enter password:
ERROR:
ORA-12560: TNS:protocol adapter error
Enter user-name:
Thnaks....

Hi,
Refer the logs:
<msg time='2014-02-11T10:43:10.455+05:30' org_id='oracle' comp_id='tnslsnr'
type='UNKNOWN' level='16' host_id='DFCC-GISDB-01'
host_addr='10.199.4.58'>
<txt>11-FEB-2014 10:43:10 * (CONNECT_DATA=(SERVICE_NAME=dfccdb.dfcc.co.in)(CID=(PROGRAM=C:\app\gisadmin\product\11.2.0\client_1\bin\sqlplus.exe)(HOST=DFCC-GISAPP-01)(USER=gisadmin))) * (ADDRESS=(PROTOCOL=tcp)(HOST=10.199.4.55)(PORT=25229)) * establish * dfccdb.dfcc.co.in * 12514
</txt>
</msg>
<msg time='2014-02-11T10:43:10.455+05:30' org_id='oracle' comp_id='tnslsnr'
type='UNKNOWN' level='16' host_id='DFCC-GISDB-01'
host_addr='10.199.4.58'>
<txt>TNS-12514: TNS:listener does not currently know of service requested in connect descriptor
</txt>
</msg>
<msg time='2014-02-11T10:43:58.706+05:30' org_id='oracle' comp_id='tnslsnr'
type='UNKNOWN' level='16' host_id='DFCC-GISDB-01'
host_addr='10.199.4.58'>
<txt>11-FEB-2014 10:43:58 * (CONNECT_DATA=(SERVICE_NAME=dfccdb.dfcc.co.in)(CID=(PROGRAM=C:\app\gisadmin\product\11.2.0\client_1\bin\sqlplus.exe)(HOST=DFCC-GISAPP-01)(USER=gisadmin))) * (ADDRESS=(PROTOCOL=tcp)(HOST=10.199.4.55)(PORT=25230)) * establish * dfccdb.dfcc.co.in * 12514
</txt>
</msg>
<msg time='2014-02-11T10:43:58.722+05:30' org_id='oracle' comp_id='tnslsnr'
type='UNKNOWN' level='16' host_id='DFCC-GISDB-01'
host_addr='10.199.4.58'>
<txt>TNS-12514: TNS:listener does not currently know of service requested in connect descriptor
</txt>
</msg>
<msg time='2014-02-11T10:44:33.120+05:30' org_id='oracle' comp_id='tnslsnr'
type='UNKNOWN' level='16' host_id='DFCC-GISDB-01'
host_addr='10.199.4.58'>
<txt>11-FEB-2014 10:44:33 * (CONNECT_DATA=(SERVICE_NAME=dfccdb.dfcc.co.in)(CID=(PROGRAM=C:\app\gisadmin\product\11.2.0\client_1\bin\sqlplus.exe)(HOST=DFCC-GISAPP-01)(USER=gisadmin))) * (ADDRESS=(PROTOCOL=tcp)(HOST=10.199.4.55)(PORT=25231)) * establish * dfccdb.dfcc.co.in * 12514
</txt>
</msg>
<msg time='2014-02-11T10:44:33.136+05:30' org_id='oracle' comp_id='tnslsnr'
type='UNKNOWN' level='16' host_id='DFCC-GISDB-01'
host_addr='10.199.4.58'>
<txt>TNS-12514: TNS:listener does not currently know of service requested in connect descriptor
</txt>
</msg>
<msg time='2014-02-11T10:45:24.662+05:30' org_id='oracle' comp_id='tnslsnr'
type='UNKNOWN' level='16' host_id='DFCC-GISDB-01'
host_addr='10.199.4.58'>
<txt>11-FEB-2014 10:45:24 * (CONNECT_DATA=(SERVICE_NAME=dfccdb.dfcc.co.in)(CID=(PROGRAM=C:\app\gisadmin\product\11.2.0\client_1\bin\sqlplus.exe)(HOST=DFCC-GISAPP-01)(USER=gisadmin))) * (ADDRESS=(PROTOCOL=tcp)(HOST=10.199.4.55)(PORT=25280)) * establish * dfccdb.dfcc.co.in * 12514
</txt>
</msg>
<msg time='2014-02-11T10:45:24.662+05:30' org_id='oracle' comp_id='tnslsnr'
type='UNKNOWN' level='16' host_id='DFCC-GISDB-01'
host_addr='10.199.4.58'>
<txt>TNS-12514: TNS:listener does not currently know of service requested in connect descriptor
</txt>
</msg>
<msg time='2014-02-11T10:48:00.819+05:30' org_id='oracle' comp_id='tnslsnr'
type='UNKNOWN' level='16' host_id='DFCC-GISDB-01'
host_addr='10.199.4.58'>
<txt>11-FEB-2014 10:48:00 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=)(USER=oracluadmin))(COMMAND=status)(ARGUMENTS=64)(SERVICE=LISTENER)(VERSION=186647296)) * status * 0
</txt>
</msg>
<msg time='2014-02-11T10:48:14.547+05:30' org_id='oracle' comp_id='tnslsnr'
type='UNKNOWN' level='16' host_id='DFCC-GISDB-01'
host_addr='10.199.4.58'>
txt>11-FEB-2014 10:48:14 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=)(USER=oracluadmin))(COMMAND=services)(ARGUMENTS=64)(SERVICE=LISTENER)(VERSION=186647296)) * services * 0
</txt>
</msg>

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create table t2 nologging parallel (degree=3) as select * from "dbo"."t1@dblink;
and its taking long time.... but its running...I doubt that parallel processing will be used as this is unique to Oracle (using rowid ranges typically) and not SQL-Server.
is there any alternate method to do this and and populate table in oracle db faster.Part of the performance overhead is pulling that data from SQL-Server to Oracle across the network link between them. This can be sped up by compressing the data first - and then transferring that across the network.
For example: using +bcp+ to export the data on the SQL-Server box to a CSV file, compress/zip the file, scp/sftp the file to Oracle, and then unzipping it there. Parallel and direct load processing can now be done using SQL*Loader to load the CSV into Oracle.
If this is a Linux/Unix base system, then the unzip/decompress process can be run in parallel with the SQL*Loader process by creating a pipe between the two - where the unzip process writes uncompressed data into the pipe and SQL*Loader reads and loads data as it becomes available via the pipe.
Alternatively, you can do you own PQ processing. Let's say the data is date ranged. You can create a procedure on Oracle that looks something like this:
{code}
create or replace procedure CopyDay( day date ) is
begin
insert /*+ append */ into local_tab select * from remote_tab@remotedb where col_day = day;
-- add logging info, commit, etc.
end;
{code}
You can now start 10 or more of these for different days and run it in the background using DBMS_JOB.

Oracle connection from remote server where oracle client is installed not happening.

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