Query from oracle to MySql using dblink fetch all the rows in MySql table

Hello,
I am using Heterogeneous connectivity between oracle 10204 to Mysql database.
I have a database link in the oracle side .
I am query a table in MySql that have 10 million rows.
Its doesnt matter if i am running :
select * from "CDR_Accounts"@mysql where "id"=7675405;
or
select * from "CDR_Accounts"@mysql ;
There is an index on the id column.
Yet, it seems that the Mysql is feteching all the rows from the table , all the data is transfering to oracle over the dblink , and only after that the requested rows are get back to the client.
The /etc/odbcinst.ini file is as follow:
[odbcprd:oracle@odbc /software/oracle]$ cat /etc/odbcinst.ini
[myodbc3]
Description             = Mysql connector to mysql version 3.5
Driver          = /software/oracle/MysqlOdbc/3.52/lib/libmyodbc3-3.51.25.so
Driver64                = /usr/lib
Setup           = /software/oracle/MysqlOdbc/3.52/lib/libmyodbc3S-3.51.25.so
Setup64         = /usr/lib
UsageCount              = 1
CPTimeout               = 3600
CPReuse         = Please advice
Thanks

When using a gateway it is always possible that a where clause is not sent to the remote database. This is called post processing and depends on several factors like the used ODBC driver, the columns and its data types but also if you specify certain functions in the where clause.
The fastest way to see if post processing happens is in Oracle 11g the explain plan for a query. In 10g the plan does not always match the statement sent to the foreign database. Here it would be better to enable gateway tracing and setting the trace level to ON. This will log the statements sent to the foreign database and you can compare what statement was sent with the statement you've tried to execute.

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Hi,
I encountered problem when trying to connect from Oracle to MYSQL using dg4odbc, hope you can shed some light
Oracle database is 11.1.0.7 on SUSE Linux 64-bit.
Since the application which runs on MYSQL DB only offers ODBC driver on Windows platform, so I installed the 32-bit ODBC driver (from ServiceNow) on a 32-bit windows server (driver download from http://wiki.service-now.com/index.php?title=ODBC_Driver) .
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listener.ora
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LSNRCTL for 32-bit Windows: Version 11.2.0.1.0 - Production on 29-MAR-2012 21:42:08
Copyright (c) 1991, 2010, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=abcdes.sda.sdva.com)(PORT=1521)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for 32-bit Windows: Version 11.2.0.1.0 - Produ
ction
Start Date 29-MAR-2012 21:11:36
Uptime 0 days 0 hr. 30 min. 32 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File C:\product\11.2.0\tg_1\network\admin\listener.ora
Listener Log File c:\product\11.2.0\tg_1\diag\tnslsnr\abcdes\list
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(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=abcdes.sda.sdva.com)(PORT=1521)))
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The command completed successfully
On Linux server where Oracle DB resides.
Added the following tns entry "jelly" on the Linux server ORACLE_HOME/network/admin:
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(HOST=abcdes.sda.sdva.com)
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TNS Ping Utility for Linux: Version 11.1.0.7.0 - Production on 29-MAR-2012 21:12:38
Copyright (c) 1997, 2008, Oracle. All rights reserved.
Used parameter files:
Used TNSNAMES adapter to resolve the alias
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tnsping from Windows server works fine: (added same tnsnames entry on windows server for testing purpose only)
C:\product\11.2.0\tg_1\bin>tnsping jelly
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012 21:45:20
Copyright (c) 1997, 2010, Oracle. All rights reserved.
Used parameter files:
C:\product\11.2.0\tg_1\network\admin\sqlnet.ora
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I don't know why only the tnsping from Linux failed, is it due to the 32-bit ODBC uncompatibility with 64-bit oracle server? or my configuration problem?
Of course, when I created the DB link from oracle, the connection failed with
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Database link created.
select * from tab1;
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Unable to retrieve text of NETWORK/NCR message 65535
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Thanks for your help,

Hi Mike,
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nttcon: entry
nttcon: toc = 1
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nsmfr: entry
nsmfr: 1528 bytes at 0x53a7e0
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nscall: entry
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nladget: entry
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