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TIBERO to MYSQL DBLINK Configuration Example and Error Handling

Document Type | Technical Information

Category | Administration

Applicable Product Version | T7, T6

Document Number | TADTI126

 

Overview

This document provides instructions on how to configure a DB Link from Tibero database to MySQL database and how to handle possible errors.

Test Information

  • Tibero: Tibero 7 (DB 7.0 FS02) Build 261550
  • MySQL: 9.0.1

 

Method

1. DB Link Configuration Steps

1) Copy / Extract gateway file

cp $TB_HOME/client/bin/tbJavaGW.zip /home/tibero/.unzip $TB_HOME/client/bin/tbJavaGW.zip

 

2) Add environment variable to profile

  • export TBGW_HOME=/home/tibero/tbJavaGW

 

3) Edit gateway config file (jgw.cfg)

vi $TBGW_HOME/jgw.cfg

[Configuration Example]

# Target database
DATABASE=MYSQL

# Datasource class name for target database
DATASOURCE_CLASS_NAME=com.mysql.cj.jdbc.MysqlDataSource
# XA datasource class name for target database
XA_DATASOURCE_CLASS_NAME=com.mysql.cj.jdbc.MysqlXADataSource

# Listener port - gateway listener port
LISTENER_PORT=1234

# Gateway Encoding - must be the same as mysql charset
ENCODING=UTF-8

# Transaction isolation level
TRANSACTION_ISOLATION_LEVEL="READ COMMITTED"

# MySQL JDBC Connection URL Format
# - jdbc:mysql://[host][:port][/database][MYSQL_PROPERTY]
MYSQL_PROPERTY=?PublicKeyRetrieval=true&useSSL=false&serverTimezone=Asia/Seoul

* Restrictions/Notes: MySQL JDBC Connector version-specific settings

  • When using version 5: DATASOURCE_CLASS_NAME=com.mysql.jdbc.jdbc2.optional.MysqlDataSource
  • Version 8 or higher: DATASOURCE_CLASS_NAME=com.mysql.cj.jdbc.MysqlDataSource
  • For detailed parameter descriptions in jgw.cfg, refer to the Tibero 7 manual.

 

4) Configure gateway library

  • Copy the MySQL JDBC to the $TBGW_HOME/lib path.
  • Reflect the JDBC driver name in the $TBGW_HOME/tbgw file.

Example: mysqljdbc โ†’ ./lib/mysql_jdbc_name

 

5) Run gateway

  • cd $TBGW_HOME
  • ./tbgw

 

6) Configure MySQL connection info (tbdsn.tbr)

vi $TB_HOME/client/config/tbdsn.tbr

Example:

link=(
        (GATEWAY=localhost)
                          (PORT=1234))
                 (TARGET=192.168.56.11:3306:jh_db)
                 (TX_MODE=GLOBAL))
)

For descriptions of each parameter, refer to the gateway process creation method in the Tibero 7 manual.

 

7) Create DBLINK

create database link link_name connect to 'mysql_user' identified by 'password' using 'alias';

Example:

create database link m_link connect to 'jh' identified by 'tibero' using 'link';

 

8) Test DBLINK

Example:

select * from employees@m_link;

 

 

2. Error Handling

Note: If you modify jgw.cfg while the gateway is running, you must restart it.

 

1) TBR-130005 Occurs (Time Zone Error)

TBR-12130: Unable to connect to remote database.
TBR-130005: Authentication failed - The server time zone value is unrecognized.

Solution: Modify jgw.cfg as below.

MYSQL_PROPERTY=?serverTimezone=Asia/Seoul

 

2) SSL-related Warning Occurs

The link executes, but an SSL Warning message appears.

Solution:

MYSQL_PROPERTY=?PublicKeyRetrieval=true&useSSL=false

 

 

3. How to Restart Gateway

  1. Kill the gateway process (ps -ef | grep tbgw โ†’ kill)
  2. Restart:
    • cd $TBGW_HOME
    • ./tbgw

 

 

 

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