TSQL Retrieve from linked Oracle server

We're porting an Oracle system to SQL server and it's not going well...
Our system is a data warehouse that extracts data from an Oracle operational system. In the Oracle version we use database links to access Oracle. On SQL Server we've created a linked server. All OK so far.
When we try to access the linked server in TSQL we have problems:
- select on a four part name does not pass filters to Oracle and our tables are huge
- OPENQUERY works fine but won't let us pass parameters
We therefore seem to be stuck when we want to update SQL server using a single keyed access to Oracle (SQL retrieves the whole table and then filters; we're processing 20,000 records and this is not acceptable!)
I would appreciate any help you can give; I've spent most of the day searching the web for examples where people have this working, but got nowhere... help!
Thanks in advance

Have you tried configuring Oracle Heterogenous Services/ Transparent Gateway? This would let you link Oracle to SQL Server via a database link which should solve your problem.
Justin
Distributed Database Consulting, Inc.
www.ddbcinc.com

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www.ddbcinc.com

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Hi all,
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prakash wrote:
Hi all,
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BEGIN
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Good Day,
Recommended Steps as follows:-
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http://sqllive.wordpress.com/

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Oracle XE DB 11gR2
Oracle APEX 4.1.1
Glassfish 3.1.2
Red Hat Linux 5.8
===========
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>
Please update your forum profile with a real handle instead of "user601798".
Oracle XE DB 11gR2
Oracle APEX 4.1.1
Glassfish 3.1.2
Red Hat Linux 5.8
===========
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Hi,
I'm trying to create a DB Link from my Oracle 11g Express Edition in a Windows XP machine to an SQL Server. Here are the steps I've done so far.
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SID_LIST_LISTENER =
(SID_LIST =
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XE =
(DESCRIPTION =
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EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
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(DESCRIPTION =
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# HS init parameters
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HS_FDS_TRACE_LEVEL = off
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C:\>lsnrctl stop
LSNRCTL for 32-bit Windows: Version 11.2.0.2.0 - Production on 18-SEP-2012 11:33
:51
Copyright (c) 1991, 2010, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
The command completed successfully
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LSNRCTL for 32-bit Windows: Version 11.2.0.2.0 - Production on 18-SEP-2012 11:33
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Copyright (c) 1991, 2010, Oracle. All rights reserved.
Starting tnslsnr: please wait...
TNSLSNR for 32-bit Windows: Version 11.2.0.2.0 - Production
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min\listener.ora
Log messages written to C:\oraclexe\app\oracle\diag\tnslsnr\PHAILORTD000012\list
ener\alert\log.xml
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1ipc
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1521)))
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
STATUS of the LISTENER
Alias                     LISTENER
Version                   TNSLSNR for 32-bit Windows: Version 11.2.0.2.0 - Produ
ction
Start Date                18-SEP-2012 11:33:57
Uptime                    0 days 0 hr. 0 min. 3 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Default Service           XE
Listener Parameter File   C:\oraclexe\app\oracle\product\11.2.0\server\network\a
dmin\listener.ora
Listener Log File         C:\oraclexe\app\oracle\diag\tnslsnr\PHAILORTD000012\li
stener\alert\log.xml
Listening Endpoints Summary...
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(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1521
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Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "SQLSERVER" has 1 instance(s).
Instance "SQLSERVER", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully6. Created database link using the following command.
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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 SQLSERVER
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Unable to retrieve text of NETWORK/NCR message 65535
ORA-02063: preceding 2 lines from SQLSERVER
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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 SQLSERVERI followed the steps provided in this link but not sure where I went wrong. Can someone help me.
http://www.dba-oracle.com/t_heterogeneous_database_connections_sql_server.htm
Thanks,
Allen

Here's more information on the machines.
Machine where the Oracle Database 11g Express Edition: IP Address is 10.162.128.67
Machine where the SQL Server database: IP Address is 142.120.51.30.
I've modified the tnsnames.ora to the following:
XE =
(DESCRIPTION =
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(DESCRIPTION =
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(HS = OK)
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TNS Ping Utility for 32-bit Windows: Version 11.2.0.2.0 - Production on 18-SEP-2
012 14:52:59
Copyright (c) 1997, 2010, Oracle. All rights reserved.
Used parameter files:
C:\oraclexe\app\oracle\product\11.2.0\server\network\admin\sqlnet.ora
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Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)
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TNS-12541: TNS:no listener
C:\>Regards,
Allen

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null

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user10264958 wrote:
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7          DBMS_LOB.CreateTemporary( c, true );
8
9          pos := 1;
10          iterations := 1;
11          loop
12                  buf := ReturnXMLFile@remote_db( 1, pos, 20 );
13                  exit when buf is null;
14                  pos := pos + length(buf);
15                  iterations := iterations + 1;
16                  DBMS_LOB.WriteAppend( c, length(buf), buf );
17          end loop;
18
19          DBMS_OUTPUT.put_line( 'Copied '||length(c)||' byte(s) from remote LOB' );
20          DBMS_OUTPUT.put_line( 'Read Iterations: '||iterations );
21          DBMS_OUTPUT.put_line( 'LOB contents (1-4000):'|| DBMS_LOB.SubStr(c,4000,1) );
22
23          DBMS_LOB.FreeTemporary( c );
24 end;
25 /
Copied 53 byte(s) from remote LOB
Read Iterations: 4
LOB contents (1-4000):<root><text>What do you want, universe?</text></root>
PL/SQL procedure successfully completed.
SQL> The concern is the size of the LOB. It does not always make sense to access the entire LOB in the database. What if that LOB is a 100GB in size? Irrespective of how you do it, selecting that LOB column from that table will require a 100GB of data to be transferred from the database to your client.
So you need to decide WHY you want the LOB on the client (which will be the local PL/SQL code in case of dealing with a LOB on a remote database)? Do you need the entire LOB? Do you need a specific piece from it? Do you need the database to first parse that LOB into a more structured data struct and then pass specific information from that struct to you? Etc.
The bottom line however is that you can use remote LOBs. Simply that you cannot use a local pointer variable to point and dereference a remote LOB.

TSQL Retrieve from linked Oracle server

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