In dblink Oracle MySQL database configuration

step

1. Download and installation [the ODBC Driver Manager]
2. downloaded and installed [the MySQL Connector / the ODBC Driver]
3. Configure the odbc.ini
4. configure the environment variables
5. Configure the tnsnames.ora
6. The Configure the listener.ora
7. The configuration of the monitor initialization file
8. create dblink

1. Download and installation [ODBC Driver Manager]

# Create a directory to place the driver package for environment

[oracle@oracle169 ~]$ cd $ORACLE_BASE
[oracle@oracle169 app]$ mkdir tools
[oracle@oracle169 app]$ cd tools

# Download and install unixODBC-2.2.14-linux-x86-64.tar.gz; and upload to the tools directory. And extract
# Download https://sourceforge.net/projects/unixodbc/files/?source=navbar

[oracle@oracle169 tools]$ tar -zxvf unixODBC-2.2.14-linux-x86-64.tar.gz
[oracle@oracle169 tools]$ mkdir unixodbc-2.2.14
[oracle@oracle169 tools]$ mv usr/local/* unixodbc-2.2.14/
[oracle@oracle169 tools]$ rm -rf usr/

2. Download and install [MySQL Connector / ODBC driver]

# Unzip download the corresponding version of mysql-connector-odbc-5.3.7- linux-el6-x86-64bit.tar.gz; this environment is linux 6.5
Download https://dev.mysql.com/downloads/connector/odbc /

[oracle@oracle169 tools]$ tar -zxvf mysql-connector-odbc-5.3.7-linux-el6-x86-64bit.tar.gz
[oracle@oracle169 tools]$ mv mysql-connector-odbc-5.3.7-linux-el6-x86-64bit my5

3. Configure odbc.ini;

[ The Oracle @ oracle169 Tools ] $ vim the odbc.ini 
 [ testdb ]     
Driver =  / u01 / App / Tools / MY5 / lib / libmyodbc5a.so 
SERVER =       #mysql server ip 
PORT =         #mysql database port
 the USER  =         #mysql database user name 
PASSWORD =     #mysql database password
 dATABASE  =     #mysql database
 OPTION  =  3 
SOCKET =

4. Configure Environment Variables

Add the following in the back .bash_profile

export PATH=/u01/app/tools/unixODBC-2.2.14/bin:$PATH
export LD_LIBRARY_PATH=/u01/app/tools/unixODBC-2.2.14/lib:$LD_LIBRARY_PATH
export ODBCINI=/u01/app/tools/odbc.ini

After the source .bash_profile; this time to test the above configuration is correct
implementation of isql -v testdb
If there is this; represents the above configuration is OK.

+---------------------------------------+
| Connected! |
| sql-statement |
| help [tablename] |
| quit |
| |
+---------------------------------------+

5. Configuration tnsnames.ora

Add later

testdb =
 (DESCRIPTION =
   (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
   (CONNECT_DATA =
     (SID = testdb))
     (HS=OK)
    )
  )

6. Configure listener.ora

# Join the red part; and restart the listener

SID_LIST_LISTENER =
 (SID_LIST =
   (SID_DESC =
     (SID_NAME = testdb)
     (ORACLE_HOME =/u01/app/oracle)
     (PROGRAM = dg4odbc)
     (ENVS=LD_LIBRARY_PATH=/u01/app/tools/unixODBC-2.2.14/lib)
    )
  )    

7. Configure the monitor's initialization file

[oracle@oracle169 tools]$ vim $ORACLE_HOME/hs/admin/inittestdb.ora
# This is a sample agent init file that contains the HS parameters that are
# needed for the Database Gateway for ODBC

# HS init parameters

HS_FDS_CONNECT_INFO = testdb
HS_FDS_FETCH_ROWS=100
HS_RPC_FETCH_SIZE=50000
HS_FDS_TRACE_LEVEL = off
HS_FDS_SHAREABLE_NAME = /u01/app/tools/unixODBC-2.2.14/lib/libodbc.so
HS_LANGUAGE=american_america.we8iso8859p1
HS_NLS_NCHAR=UCS2
#
# ODBC specific environment variables
#
set ODBCINI= /u01/app/tools/odbc.ini

#
# Environment variables required for the non-Oracle system
#
#set <envvar>=<value>

8. Create dblink

create public database link db_testdb connect to "mysql_user" identified by "password" using 'testdb';