postgresql实时同步到mysql-原创手记-慕课网

应客户要求，需要同步数据到他们自己的数据库用于简单的数据分析，但这部分数据在postgresql，客户又不想再建pg，想直接同步到他们现有的mysql库，实时性倒是不要求。
考虑到

1、异构数据库同步

2、只同步指定客户的行数据

有之前同步到es的经验，同样使用了腾讯oceanus，其它工具没搞定

客户库中创建表

CREATE TABLE tb_1 (
    id bigint primary key,
    did bigint,
    gid bigint,
    fee DECIMAL(10,2),
    created_at timestamp,
    type smallint,
    remark string ,
    key i_did(did)
);

创建SQL作业

CREATE TABLE tb_1 (
    id bigint,
    did bigint,
    gid bigint,
    fee DECIMAL(10,2),
    create_time timestamp,
    type smallint,
    remark string,
    PRIMARY KEY (`id`) NOT ENFORCED
) WITH (
  'connector' = 'postgres-cdc',
  'hostname' = 'ip', 
  'port' = '5432',             
  'username' = 'user', 
  'password' = 'pwd', 
  'database-name' = 'db',
  'schema-name' = 'your-schema', 
  'table-name' = 'tbname',
  'slot.name' = 'slotname_tb_1',
  'scan.incremental.snapshot.enabled' = 'true'
);



CREATE TABLE kh_tb_1 (
    id bigint,
    did bigint,
    gid bigint,
    fee DECIMAL(10,2),
    create_time timestamp,
    type smallint,
    remark string,
    PRIMARY KEY (`id`) NOT ENFORCED
) WITH (
  'connector' = 'jdbc',
  'url' = 'jdbc:mysql://xxxxxx:3306/db?rewriteBatchedStatements=true&serverTimezone=Asia/Shanghai',
  'table-name' = 'tb_1',
  'username' = 'user',
  'password' = 'pwd',
  'sink.buffer-flush.max-rows' = '5000',
  'sink.buffer-flush.interval' = '2s',
  'sink.max-retries' = '10'
);

insert into kh_tb_1 select * from tb_1 where did=xxxxxxx;

需要注意的：

1.字段类型要合理和对应，跟着cdc的类型走，不跟数据库一样

2.只有这个客户数据，insert不要忘了加where

3.pg涉及同步slot， slot.name要一张表一个，表多的话，要修改pg参数，max_replication_slots（默认是10，修改此参数要重启）

4.报错[55000]: ERROR: cannot delete from table “tb_1” because it does not have a replica identity ，调整下表 alter table tb_1 REPLICA IDENTITY FULL;

启动作业任务即可。

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