Oracle to MySQL DatabaseLink

DATABASE LINK FROM ORACLE TO MYSQL
Introduction
This document describe steps to create database link between oracle to MySQL (Heterogeneous
Services) / Oracle Gateway, Regarding to Oracle Documentation Gateways will integrate with any
number of non-Oracle systems from an Oracle application.
Environment:-
Operating System: Solaris 11.1
Database: - 11.2.0.3
In my case Grid Infrastructure installed on both node, so I choose one node to configure database link.
Software Needed:-
1- UnixODBC (Generic), Download From here.
2- MySQL ODBC/Connector, Download From Here.
Notes:-
Command Line will be in Red Color.
Output for command Line will be in Blue Color.

About the Author
Osama Mustafa has progressive experience in Oracle Products, community. He recently served as
Oracle Database Administrator.
Provide Database Implementation Solutions, High Availability Solution, Infrastructure and Storage
Planning, Install, Configure, Implement and manage Oracle E-Business Suite environments. Architect,
build and support highly-available Oracle EBS, Database and Fusion Middleware environments including
appropriate reporting, Installs, configures, upgrades, tunes, and maintains production, development and
test databases.
He entered Oracle ACE Program in 2013, he is author for the book Oracle Penetration Testing, Osama
Mustafa Certified OCP 10g,11g, Linux Implementations , Certified Ethical hacker and LPT , and Solaris
Administrator.
Include to all this Osama Mustafa is international Speaker in Oracle User Group and Oracle OTN Tour,
Published Online Articles in His blog about Oracle Technology.
Twitter: @OsamaOracle
G+: Osama Mustafa
SlidShare: Osama Mustafa
LinkedIn: http://www.linkedin.com/in/osamamustafa
Blog: https://osamamustafa.blogpsot.com.

To start Configure Database Link you need to follow the below steps first, to make easier I already upload
the necessary files you will need on my account here: -
https://github.com/OsamaOracle/db4odbc.git
You Can Download it and Change Path depend on files and Library Locations, You can create your entire
in Listener.ora and Tnsnames.ora but Sometimes problem related to space and “(“ “)” will show up.
Step #1:-
Determine Version for dg4odbc on Operating system using
file $ORACLE_HOME/bin/dg4odbc
ELF 64-bit LSB executable, Intel x86-64, version 1 (SYSV), for GNU/Linux 2.6.9, dynamically
linked (uses shared libs), for GNU/Linux 2.6.9, not stripped
This Command Explain which version of ODBC Driver I should use Which 64 bit.
Step #2:-
(This step should be done as root user).
It’s Time to Download and Install unixODBC, I will assume you already download the file and upload to
the server, I am using Solaris 11.2 but as I already mentioned before I will build unixODBC manually
therefore I will not use unixODBC.pkg.
In the website http://unixODBC.org they already mentioned step to configure it but I will re mention it here
again.
I prefer to setup and configure unixODBC under /usr/local/unixODBC.
Installation Steps:-
# unzip unixODBC.

# cd UnixODBC.
# export CFLAGS="-m64"
# ./configure --prefix=/usr/local/unixODBC
# make
# make install
Step #3:-
(As Oracle User).
Now unixODBC installed and configured under /usr/local/unixODBC, Next Step Download MySQL ODBC
Connecter, Choose the right one for your OS depend on MySQL Version.
Upload connector to the server and unzip it only (without do anything else) under /u01/app/oracle/.
Step #4:-
(As Oracle User).
Export Variables.
In Linux  .bash_profile
In Solairs  .profile
First Variable:-
export LD_LIBRARY_PATH=
/u01/app/oracle/product/11.2.0/db_home1/lib32:/usr/local/unixODBC/lib/:/u01/app/oracle/mysql-
connector-odbc-5.1.6-solaris11-x86-32bit/lib/libmyodbc5.so
Second Variable:-
export ODBCINI=/usr/local/unixODBC/etc/odbc.ini
export ODBCSYSINI= /usr/local/unixODBC/etc
This step is very important and without will cause problem with Library.

Step #5:-
( As Root User ).
Configure odbc.ini located in ( /usr/local/unixODBC/etc ), the file should look like the below :-
[DSN-NAME]
Driver = /u01/app/oracle/mysql-connector-odbc-3.51.30-solaris10-sparc-64bit/lib/libmyodbc3.so
DATABASE = <MySQL-Database-name>
DESCRIPTION = MySQL ODBC 5.2.5 Connector Sample
PORT =<listing Port for MySQL> Default 3306
SERVER = < MySQL Server IP >
UID= username
PWD = password (should be complex).
Option=3
Examples:-
[MySQL]
Driver = /u01/app/oracle/mysql-connector-odbc-3.51.30-solaris10-sparc-
64bit/lib/libmyodbc3.so
DATABASE = 4s
DESCRIPTION = MySQL ODBC 5.2.5 Connector Sample
PORT = 3306
SERVER = 172.16.2.120
UID= root
PWD = Osama123
Option=3
It’s configured.

Step #6:-
I choose to put this as steps because it will avoid time wasting which library test.
As Oracle User:-
# ldd libmyodbc3.so
The output will be like:-
libsocket.so.1 => /lib/64/libsocket.so.1
libnsl.so.1 => /lib/64/libnsl.so.1
libm.so.2 => /lib/64/libm.so.2
librt.so.1 => /lib/64/librt.so.1
libz.so.1 => /lib/64/libz.so.1
libodbcinst.so.1 => /usr/lib/64/libodbcinst.so.1
libdl.so.1 => /lib/64/libdl.so.1
libthread.so.1 => /lib/64/libthread.so.1
libc.so.1 => /lib/64/libc.so.1
libmp.so.2 => /lib/64/libmp.so.2
libmd.so.1 => /lib/64/libmd.so.1
libltdl.so.7 => /usr/lib/64/libltdl.so.7
libpthread.so.1 => /lib/64/libpthread.so.1
libcryptoutil.so.1 => /lib/64/libcryptoutil.so.1
/lib/sparcv9/../libm/sparcv9/libm_hwcap1.so.2
The Most Important thing in the above output to check if there is nothing in library “Not Found”
Step #7:-
(As oracle User).

Test connection using odbc only, Only on OS Level, go the /usr/local/unixODBC/bin.
# ./isql –v [DSN-NAME]
Example:-
# ./isql –v MySQL.
The below is output:-
+---------------------------------------+
| Connected! |
| |
| sql-statement |
| help [tablename] |
| quit |
| |
+---------------------------------------+
SQL>
Until this step you didn’t do anything only configure odbc, next step will explain how to configure Oracle.
Step #8:-

Configuration for Oracle Start with initSID.ora file. Oracle already create template located in
$ORACLE_HOME/hs/admin just copy with new name, the default one initdg4odbc.ora you can leave
without change and edit it.
Edit the file and set the new variables like the below:-
#
#HS init parameters
#
HS_FDS_CONNECT_INFO= [DSN_NAME]  same as odbc.ini
HS_FDS_TRACE_LEVEL= DEBUG  Trace level.
HS_FDS_SHAREABLE_NAME= /usr/local/unixODBC/lib/libodbc.so
HS_FDS_SUPPORT_STATISTICS= FALSE
HS_LANGUAGE=AMERICAN_AMERICA.WE8ISO8859P1
#HS_NLS_DATE_FORMAT=YYYY-MM-DD
#
# ODBC specific environment variables
#
set ODBCINI=/usr/local/unixODBC/etc/odbc.ini
Example:-
#
#HS init parameters
#
HS_FDS_CONNECT_INFO= MySQL
HS_FDS_TRACE_LEVEL= off
HS_FDS_SHAREABLE_NAME= /usr/local/unixODBC/lib/libodbc.so
HS_FDS_SUPPORT_STATISTICS= FALSE
HS_LANGUAGE=AMERICAN_AMERICA.WE8ISO8859P1
#HS_NLS_DATE_FORMAT=YYYY-MM-DD
#
# ODBC specific environment variables
#
set ODBCINI=/usr/local/unixODBC/etc/odbc.ini
Step #9:

This Step will describe how to configure Listener.ora, You can download Listener.ora and copy/Paste the
entire to make sure there’s nothing wrong or you can create your own.
Open Listener.ora and add the below line depend on your Configuration :-
SID_LIST_LISTENER=
(SID_LIST=
(SID_DESC=
(SID_NAME=dg4odbc)
(ORACLE_HOME=/u01/app/oracle/product/11.2.0/db_home1)
(ENVS=LD_LIBRARY_PATH=/usr/local/unixODBC/lib:/u01/app/oracle/product/11.2.0/db_home1
/lib:/u01/app/oracle/mysql-connector-odbc-3.51.30-solaris10-sparc-64bit/lib)
(PROGRAM=dg4odbc)
)
)
Some Notes about the above:-
1- SID_LIST_LISTENER  Indicate to your LISTENER NAME.
2- SID_NAME= Depend init….ora file.
3- Change ORACLE_HOME.
4- LD_LIBRARY_PATH Depend where you installed unixODBC and MySQL connecter.
5- Program Indicate to init…ora name.
Now After edit Listener.ora Save it, this step require to restart Listener.ora
LSNRCTL > stop LISTENER
LSNRCTL > Start LISTENER
Output:-

Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=)(PORT=1521))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Solaris: Version 11.2.0.3.0 - Production
Start Date 16-JUN-2014 15:51:47
Uptime 0 days 1 hr. 50 min. 11 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /u01/app/11.2.0/grid/network/admin/listener.ora
Listener Log File /u01/app/grid/diag/tnslsnr/Node1/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=LISTENER)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=Node1)(PORT=1521)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=Node2)(PORT=1521)))
Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+ASM1", status READY, has 1 handler(s) for this service...
Service "PRDSBL" has 1 instance(s).
Instance "PRDSBL1", status READY, has 1 handler(s) for this service...
Service "PRDSBLXDB" has 1 instance(s).
Instance "PRDSBL1", status READY, has 1 handler(s) for this service...
Service "dg4odbc" has 1 instance(s).
Instance "dg4odbc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
Step #10:-
Finally add new entire to tnsnames.ora
dg4odbc =
(DESCRIPTION=
(ADDRESS=(PROTOCOL=tcp)(HOST=sbl-prd-db1)(PORT=1521))
(CONNECT_DATA=(SID=dg4odbc))
(HS=OK)
)
tnsping dg4odbc should work.
Step #11:-

SQL > create public database link <DB-LINK-NAME> connect "usename" identified by "password" using
'odbc';
Notes:
1- Username & password should be the same as odbc.ini ( in my case root and Osama123);
2- Tnsnames.ora should be the same as entire in tnsnames.ora.
Now Test it :-
SQL > Select * from “Table-name”@DB-Link
Reference:-
 How to Resolve Common Errors Encountered while using Database Gateways (DG4IFMX,
Dg4MSQL, DG4SYBS), DG4ODBC or Generic Connectivity (Doc ID 234517.1)
 Database Gateway and Generic Connectivity (DG4ODBC) Licensing Considerations (Doc ID
232482.1)
 Gateway Configuration Utility for Database Gateway for ODBC - DG4ODBC - to Connect to Non-
Oracle Databases For Example - DB2, SQL*Server, Sybase, Informix, MySQL (Doc ID 1274143.1)
 Master Note for Oracle Gateway Products (Doc ID 1083703.1)
 What Are The Options To Connect From Oracle Via a Database Link Using DG4ODBC To MySQL
Using An ODBC Driver? (Doc ID 1526864.1)
Thank you
Osama Mustafa
Oracle ACE.

Oracle to MySQL DatabaseLink

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