Oracle heterogeneous services in 10g r2

The dba configured oracle heterogeneous services to connect to a SQL Server database.
The purpose of doing this is to select from a view in SQL Server.
We are able to select. But as soon as a where clause is introduced, the session just hangs.
So we thought it might be because we are accessing a view.
We then created a table in SQL Server and inserted all the data into the table. However, the select with a where clause does not work.
We then created a table in Oracle and selected from the view in SQL Server to insert data into the oracle table . Once the data is in an Oracle table, we are able to select and use a where clause. We do not want to bring data into Oracle as the data architect is trying to avoid a duplication scenario.
The DBA is not able to find what is wrong. Can someone please help. Have you seen a similar issue?
The oracle version is 10.2.0.4 and sql server is 2000.
Thanks,
ksd
Edited by: user8699561 on Mar 16, 2010 8:30 AM

If the application is using sequences, it cannot require that values are not skipped. Oracle sequences will never be gap-free. And assuming that there are multiple users, the order of transactions and the order of sequence generated values cannot be guaranteed.
I suppose that if your failover process was manual and scheduled and the downtime window was sufficient (i.e. you're failing over because you're taking one server down for scheduled maintenance, not because there was an unexpected fault), you could set up a script that would shut down the application, iterate over the sequences on the master getting the next value, alter the local sequences (presumably by altering the increment, selecting the next value from the local sequences, and returning the increment to 1), and then allow the application to start on the new server. If your downtime window is sufficient, when the primary has an unscheduled failure, you could potentially do a SELECT MAX(primary key) on each table on the local system (while the application is down), alter the sequences and then allow the application to start running. Neither is a particularly pretty option, and the latter option can be quite expensive if there is a lot of data.
Justin

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    LSNRCTL for 64-bit Windows: Version 11.2.0.3.0 - Production on 08-MAY-2013 17:44:24
    Copyright (c) 1991, 2011, Oracle. All rights reserved.
    Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
    STATUS of the LISTENER
    Alias LISTENER
    Version TNSLSNR for 64-bit Windows: Version 11.2.0.3.0 - Production
    Start Date 08-MAY-2013 17:44:05
    Uptime 0 days 0 hr. 0 min. 18 sec
    Trace Level off
    Security ON: Local OS Authentication
    SNMP OFF
    Listener Parameter File C:\app\product\11.2.0\dbhome_1\network\admin\listener.ora
    Listener Log File C:\app\diag\tnslsnr\D-9RGC8X1\listener\alert\log.xml
    Listening Endpoints Summary...
    (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1521ipc)))
    (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=1521)))
    Services Summary...
    Service "CLRExtProc" has 1 instance(s).
    Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
    Service "MYSQL_LOCAL" has 1 instance(s).
    Instance "MYSQL_LOCAL", status UNKNOWN, has 1 handler(s) for this service...
    Service "QA_IMS_MYSQL" has 1 instance(s).
    Instance "QA_IMS_MYSQL", status UNKNOWN, has 1 handler(s) for this service...
    The command completed successfully
    C:\Windows\system32>tnsping mysql_local
    TNS Ping Utility for 64-bit Windows: Version 11.2.0.3.0 - Production on 08-MAY-2013 17:44:36
    Copyright (c) 1997, 2011, Oracle. All rights reserved.
    Used parameter files:
    C:\app\product\11.2.0\dbhome_1\network\admin\sqlnet.ora
    Used TNSNAMES adapter to resolve the alias
    Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) (CONNECT_DATA = (SID = MYSQL_LOCAL) (HS = OK)))
    OK (0 msec)
    SQL> conn / as sysdba
    Connected.
    SQL> select * from colour@mysql_local;
    select * from colour@mysql_local
    ERROR at line 1:
    ORA-28546: connection initialization failed, probable Net8 admin error
    ORA-02063: preceding line from MYSQL_LOCAL

    Hi,
    The gateway file initMYSQL_LOCAL.ora should be placed in the directory -
    $ORACLE_HOME\hs\admin
    which is the expected location. In your setup this should be -
    C:\app\product\11.2.0\dbhome_1\hs\admin
    If the file is already in that location then make sure that in the listener.ora and tnsnames.ora that in each section every line except the first line starts with at least one space -
    SID_LIST_LISTENER =
    <space>(SID_LIST =
    <space>(SID_DESC =
    LISTENER =
    <space>(DESCRIPTION_LIST =
    Tnsnames.ora
    MYSQL_LOCAL =
    <space>(DESCRIPTION =
    <space>(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    However, there is also a problem with the tnsnames.ora file. You have -
    Tnsnames.ora
    MYSQL_LOCAL =
    (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    (CONNECT_DATA =
    (SID = MYSQL_LOCAL)
    (HS = OK)
    ) <=== move this bracket
    but it should be -
    Tnsnames.ora
    MYSQL_LOCAL =
    (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    (CONNECT_DATA =
    (SID = MYSQL_LOCAL)
    ) <=== bracket moved here
    (HS = OK)
    Of course, with spaces as shown above. They are often lost in the forums.
    You may also need to change -
    (HOST = localhost)
    to -
    (HOST = <actual host name>)
    but it depends on your setup.
    Try these changes and let me know what happens.
    Regards,
    Mike

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