Call now: 252-767-6166  
Oracle Training Oracle Support Development Oracle Apps

 
 Home
 E-mail Us
 Oracle Articles
New Oracle Articles


 Oracle Training
 Oracle Tips

 Oracle Forum
 Class Catalog


 Remote DBA
 Oracle Tuning
 Emergency 911
 RAC Support
 Apps Support
 Analysis
 Design
 Implementation
 Oracle Support


 SQL Tuning
 Security

 Oracle UNIX
 Oracle Linux
 Monitoring
 Remote s
upport
 Remote plans
 Remote
services
 Application Server

 Applications
 Oracle Forms
 Oracle Portal
 App Upgrades
 SQL Server
 Oracle Concepts
 Software Support

 Remote S
upport  
 Development  

 Implementation


 Consulting Staff
 Consulting Prices
 Help Wanted!

 


 Oracle Posters
 Oracle Books

 Oracle Scripts
 Ion
 Excel-DB  

Don Burleson Blog 


 

 

 


 

 

 
 

ORA-28545 Oracle to MySQL Connection Error Tips

Oracle Database Tips by Donald BurlesonJune 7, 2015

Question:  I am trying to connect Oracle to MySQL using heterogeneous services and I get this error:

Link : "DG4ODBC.UOU.EDU.PS"
Error : 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 DG4ODBC

How do I fix this ORA-28545 error?

Answer:  This can be a listener syntax error or a generic connectivity issue.  Review the steps to connect Oracle to MySQL  carefully:

  • Set global_names=false
  •  Verify that the standard ODBC connection to MySQL works
  •  Verify that you can connect via the standard database link.  Make sure that the listener name points to the heterogeneous services link.
  •  Check the listener.ora syntax as this can be a listener.ora syntax problem:
  1.  Make sure that your $ORACLE_HOME is correct
  2. Make sure that you can the host name (and not the IP address) for the servers.  

There are several other solutions for a ORA-28545 error:

  •  Please see MOSC note: 264567.1 titled "How to setup Generic Connectivity HSODBC on Linux".  Please note that heterogeneous services only works on 32 bit servers, not 64 bit itanium . . .

The oerr message output for the ORA-28545 says that the database link connection failed:  

ORA-28545: error diagnosed by Net8 when connecting to an agent  

Cause: An attempt to call an external procedure or to issue SQL to a non-Oracle system on a Heterogeneous Services database link failed at connection initialization. The error diagnosed by Net8 NCR software is reported separately.  

Action: Refer to the Net8 NCRO error message. If this isn't clear, check connection administrative setup in tnsnames.ora and listener.ora for the service associated with the Heterogeneous Services database link being used, or with 'extproc_connection_data' for an external procedure call.  

See these steps for diagnosing the ORA-28545 error:  

  1. Install Oracle ODBC drivers on the server (your local Oracle database) that will access the remote MySQL database using the database link.  
  2. Setup the ODBC connection on the local Oracle database  
  3. Test the ODBC drivers to ensure that connectivity is made to the MySQL database.  
  4. Ensure that your global_names parameter is set to False.  
  5. Configure the Oracle Heterogeneous services by creating an initodbc.ora file within the Oracle database.  
  6. Modify the Listener.ora file:
      
    SID_NAME
    is the DSN for the remote database.
    ORACLE_HOME
    is the actual Oracle home file path.
    PROGRAM tells Oracle to use heterogeneous services.

    SID_LIST_LISTENER =
    (SID_LIST =
    (SID_DESC =
    (SID_NAME=Cas30C) -- Enter the DSN on this line
    (ORACLE_HOME = c:\oracle10gdb) -- Enter your Oracle home on this line
    (PROGRAM = hsodbc) ) )  

      
  7. Modify the Tnsnames.ora file: This is the Oracle database installation accessed by the users to connect to the ODBC drivers.

    (DESCRIPTION=
    (ADDRESS_LIST= (
    Address=(PROTOCOL=TCP) (HOST=
    -- (Server x) (PORT=1521))) -- Enter the port on which the server x Oracle installation -- is listening
    (CONNECT_DATA=(SID=Cas30c)) - Enter the DSN name
    (HS=OK) -- Enter this value. It tells Oracle to use hetergeneous services )
      
  8. Reload the listener on local Oracle database.  
  9. Create a database link on the local Oracle installation that accesses the heterogeneous connection, which, in turn, connect to MySQL.  
  10.  Run a MySQL "select" SQL statement from the Oracle installation using the database link.  
 
Get the Complete
Oracle SQL Tuning Information 

The landmark book "Advanced Oracle SQL Tuning  The Definitive Reference"  is filled with valuable information on Oracle SQL Tuning. This book includes scripts and tools to hypercharge Oracle 11g performance and you can buy it for 30% off directly from the publisher.

 


 

 

Burleson is the American Team

Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications.

Errata?  Oracle technology is changing and we strive to update our BC Oracle support information.  If you find an error or have a suggestion for improving our content, we would appreciate your feedback.  Just  e-mail:  and include the URL for the page.


                    









Burleson Consulting

The Oracle of Database Support

Oracle Performance Tuning

Remote DBA Services


 

Copyright © 1996 -  2016

All rights reserved by Burleson

Oracle ® is the registered trademark of Oracle Corporation.


 

��  
 
 
Oracle Training at Sea
 
 
 
 
oracle dba poster
 

 
Follow us on Twitter 
 
Oracle performance tuning software 
 
Oracle Linux poster