DataX 是一个离线数据同步工具/平台，支持多种异构数据库之间的迁移同步，可以通过文档查看各个数据源的配置方法。链接地址：https://github.com/alibaba/datax

开始迁移

这里主要是 mysql -> ob，其他数据源的配置可以参考 datax。

1、下载安装 datax

官方地址，有两种方式可以安装

https://github.com/alibaba/DataX/blob/master/userGuid.md

或者也可以直接通过下面的步骤下载安装

# 下载 datax
wget https://datax-opensource.oss-cn-hangzhou.aliyuncs.com/202309/datax.tar.gz
 
# 解压
tar -xf datax.tar.gz
 
# 调试，没有报错则正常
cd datax/bin
python datax.py ../job/job.json

2、在 OB 集群内创建表结构

3、编写配置文件

{
    "job": {
        "setting": {
            "speed": {
                "channel": 4
            },
            "errorLimit": {
                "record": 0,
                "percentage": 0.1
            }
        },
        "content": [
            {
                "reader": {
                    "name": "mysqlreader",
                    "parameter": {
                        "username": "root",
                        "password": "xxxxx",
                        "column": ["*"],
                        "connection": [
                            {
                                "table": ["t1"],
                                "jdbcUrl": ["jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf8&useSSL=false"]
                            }
                        ]
                    }
                },
                "writer": {
                    "name": "oceanbasev10writer",
                    "parameter": {
                        "obWriteMode": "insert",
                        "column": ["*"],
                        "preSql": ["truncate table t1"],
                        "connection": [
                            {
                                "jdbcUrl": "jdbc:oceanbase://127.0.0.1:2883/test2?",
                                "table": ["t1"]
                            }
                        ],
                        "username": "用户名@租户名#集群名",
                        "password":"xxxxx",
                        "writerThreadCount":10,
                        "batchSize": 1000,
                        "memstoreThreshold": "0.9"
                    }
                }
            }
        ]
    }
}

4、启动迁移

python bin/datax.py conf/mysql2ob.json

5、如果需要离线定时同步增量，可以指定 where 或者 querySql

指定 where

                "reader": {
                    "name": "mysqlreader",
                    "parameter": {
                        "username": "root",
                        "password": "xxxx",
                        "column": ["*"],
                        "where": "id >2"
                        "connection": [
                            {
                                "table": ["t1"],
                                "jdbcUrl": ["jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf8&useSSL=false"]
                            }
                        ]
                    }
                },

指定querySql

                "reader": {
                    "name": "mysqlreader",
                    "parameter": {
                        "username": "root",
                        "password": "xxxx",
                        "column": ["*"],
                        "connection": [
                            {
                                "querySql": [
                                    "select * from t1 where id > 4;"
                                ],
                                "jdbcUrl": ["jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf8&useSSL=false"]
                            }
                        ]
                    }
                },