关于oracle:数据传输-如何使用-DTLE-将-Oracle-数据同步到-MySQL

作者：刘安

爱可生测试团队成员，次要负责 DTLE 开源我的项目相干测试工作，善于 Python 自动化测试开发。

本文起源：原创投稿

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前言：过年前 DTLE 公布了 4.22.01.0 版本，该版本最重要的个性是反对 Oracle-MySQL 增量数据同步。明天我就来给大家介绍一下这个性能。

一、现状

1. 目前只反对增量同步

a. 能够依据 SCN 节点开启增量复制

b. 从工作启动工夫开启增量复制

2. 类型映射

a. 已反对类型

b. 待反对类型

c. 不反对类型

3. DML 反对度

a. DML 类型

b. DML 函数反对度

4. DDL 反对度

二、环境筹备

1. Oracle 数据库开启归档日志

shell> su oracle
shell> mkdir /u01/app/oracle/oradata/archive_log
shell> sqlplus sys/oracle as sysdba

SQL> alter system set log_archive_dest_1='location=/u01/app/oracle/oradata/archive_log' scope=spfile;
SQL> alter system set db_recovery_file_dest_size = 10G;
SQL> shutdown immediate;
SQL> startup mount;
SQL> alter database add logfile group 3 '/u01/app/oracle/fast_recovery_area/XE/onlinelog/redo01.log' size 500m;
SQL> alter database add logfile group 4 '/u01/app/oracle/fast_recovery_area/XE/onlinelog/redo02.log' size 500m;
SQL> alter database add logfile group 5 '/u01/app/oracle/fast_recovery_area/XE/onlinelog/redo03.log' size 500m;
SQL> alter database archivelog;
SQL> alter database add supplemental log data (all) columns;
SQL> alter database open;
SQL> archive log list;
# Archive Mode 示意已开启归档模式，Archive destination 示意归档日志贮存门路 

2. 装置 LogMiner 工具（Oracle 装置时默认装置）

可查看零碎中是否存在运行 LogMiner 所须要的 dbms_logmnr、dbms_logmnr_d 包，如果没有装置 LogMiner 工具须要的包，须要运行上面两个命令：

shell> cat $ORACLE_HOME/rdbms/admin/dbmslm.sql | sqlplus sys/oracle as sysdba
shell> cat $ORACLE_HOME/rdbms/admin/dbmslmd.sql | sqlplus sys/oracle as sysdba

3. 创立 logminer 须要角色权限

shell> su oracle
shell> sqlplus sys/oracle as sysdba

SQL> create user roma_logminer identified by oracle default tablespace users;

SQL> GRANT CREATE SESSION TO roma_logminer;
SQL> GRANT SET CONTAINER TO roma_logminer;
SQL> GRANT SELECT ON V_$DATABASE TO roma_logminer;
SQL> GRANT FLASHBACK ANY TABLE TO roma_logminer;
SQL> GRANT SELECT ANY TABLE TO roma_logminer;
SQL> GRANT SELECT_CATALOG_ROLE TO roma_logminer;
SQL> GRANT EXECUTE_CATALOG_ROLE TO roma_logminer;
SQL> GRANT SELECT ANY TRANSACTION TO roma_logminer;
SQL> GRANT CREATE TABLE TO roma_logminer;
SQL> GRANT LOCK ANY TABLE TO roma_logminer;
SQL> GRANT CREATE SEQUENCE TO roma_logminer;
SQL> GRANT EXECUTE ON DBMS_LOGMNR TO roma_logminer;
SQL> GRANT EXECUTE ON DBMS_LOGMNR_D TO roma_logminer;

SQL> GRANT SELECT ON V_$LOG TO roma_logminer;
SQL> GRANT SELECT ON V_$LOG_HISTORY TO roma_logminer;
SQL> GRANT SELECT ON V_$LOGMNR_LOGS TO roma_logminer;
SQL> GRANT SELECT ON V_$LOGMNR_CONTENTS TO roma_logminer;
SQL> GRANT SELECT ON V_$LOGMNR_PARAMETERS TO roma_logminer;
SQL> GRANT SELECT ON V_$LOGFILE TO roma_logminer;
SQL> GRANT SELECT ON V_$ARCHIVED_LOG TO roma_logminer;
SQL> GRANT SELECT ON V_$ARCHIVE_DEST_STATUS TO roma_logminer;

SQL> alter user roma_logminer quota unlimited ON users;

4. 部署一个单节点的 4.22.01.0 版本 DTLE

https://github.com/actiontech…

三、创立 Oracle-MySQL 工作

1. 获取 Token

shell> curl -s -X POST "http://172.100.9.11:8190/v2/loginWithoutVerifyCode" -H "accept: application/json" -H "Content-Type: application/json" -d "{\"password\": \"admin\", \"tenant\": \"platform\", \"username\": \"admin\"}" | jq
{
  "message": "ok",
  "data": {"token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJleHAiOjE2NDYxOTE2MzksImdyb3VwIjoicGxhdGZvcm0iLCJuYW1lIjoiYWRtaW4ifQ.-c_jVkxd_vP5Ka3gocdfGZIudWPujutdHpQYx8srX00"}
}

2. 筹备 job 文件

shell> cat job.json
{
  "job_id": "test_oracle",
  "src_task": {
    "connection_config": {
      "database_type": "Oracle",
      "host": "172.100.9.31",
      "port": 1521,
      "user": "roma_logminer",
      "password": "oracle",
      "service_name": "XE"
    },
    "node_id": "96d28881-f91b-19f4-1614-4d8a0e718e2f",
    "binlog_relay": false,
    "repl_chan_buffer_size": 120,
    "group_max_size": 1,
    "group_timeout": 100,
    "oracle_src_task_config": {"scn": 0},
    "task_name": "src",
    "replicate_do_db": [
      {"table_schema": "ACTION_DB"}
    ]
  },
  "is_password_encrypted": false,
  "dest_task": {
    "connection_config": {
      "database_type": "MySQL",
      "host": "172.100.9.1",
      "port": 3306,
      "user": "test_dest",
      "password": "test_dest"
    },
    "node_id": "96d28881-f91b-19f4-1614-4d8a0e718e2f",
    "task_name": "dest",
    "mysql_dest_task_config": {}},
  "task_step_name": "job_stage_full",
  "failover": true,
  "retry": 2
}

3. 创立 Oracle-MySQL job

shell> curl -s -X POST "http://172.100.9.11:8190/v2/job/migration/create" -H "accept: application/json" -H "Authorization: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJleHAiOjE2NDYxOTE2MzksImdyb3VwIjoicGxhdGZvcm0iLCJuYW1lIjoiYWRtaW4ifQ.-c_jVkxd_vP5Ka3gocdfGZIudWPujutdHpQYx8srX00" -H "Content-Type: application/json" -d @job.json | jq
{
  "job": {
    "job_id": "test_oracle-migration",
    "task_step_name": "job_stage_full",
    "reverse": false,
    "failover": true,
    "is_password_encrypted": false,
    "src_task": {
      "task_name": "src",
      "node_id": "96d28881-f91b-19f4-1614-4d8a0e718e2f",
      "replicate_do_db": [
        {
          "table_schema": "ACTION_DB",
          "table_schema_regex": "","table_schema_rename":"",
          "tables": null
        }
      ],
      "replicate_ignore_db": null,
      "skip_create_db_table": false,
      "drop_table_if_exists": false,
      "mysql_src_task_config": null,
      "oracle_src_task_config": {"scn": 0},
      "group_max_size": 1,
      "group_timeout": 100,
      "repl_chan_buffer_size": 120,
      "chunk_size": 2000,
      "connection_config": {
        "host": "172.100.9.31",
        "port": 1521,
        "user": "roma_logminer",
        "password": "*",
        "service_name": "XE",
        "database_type": "Oracle"
      }
    },
    "dest_task": {
      "task_name": "dest",
      "node_id": "96d28881-f91b-19f4-1614-4d8a0e718e2f",
      "database_type": "","mysql_dest_task_config": {"parallel_workers": 1,"use_my_sql_dependency": false,"dependency_history_size": 2500},
      "connection_config": {
        "host": "172.100.9.1",
        "port": 3306,
        "user": "test_dest",
        "password": "*",
        "service_name": "","database_type":"MySQL"
      }
    },
    "retry": 2
  },
  "eval_create_index": 12,
  "job_modify_index": 12,
  "message": "ok"
}

4. 源端 Oracle 写入数据

SQL> create tablespace ACTION_DB datafile 'ACTION_DB.dbf' size 100M;
SQL> create user ACTION_DB identified by ACTION_DB default tablespace ACTION_DB;
SQL> grant unlimited tablespace to ACTION_DB;
SQL> CREATE TABLE ACTION_DB.CHAR_255_COLUMNS(col1 INT, col2 CHAR(255));
SQL> INSERT INTO ACTION_DB.CHAR_255_COLUMNS VALUES (0, NULL);
SQL> INSERT INTO ACTION_DB.CHAR_255_COLUMNS VALUES (1, 'abcdefghijklmnopqrstuvwxyz');
SQL> INSERT INTO ACTION_DB.CHAR_255_COLUMNS VALUES (2, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ');
SQL> INSERT INTO ACTION_DB.CHAR_255_COLUMNS VALUES (3, '1234567890');
SQL> INSERT INTO ACTION_DB.CHAR_255_COLUMNS VALUES (4, 1234567890);
SQL> INSERT INTO ACTION_DB.CHAR_255_COLUMNS VALUES (5, '~`!@#$%^&*()-=_+{}[]|\:;<>,.?/');
SQL> INSERT INTO ACTION_DB.CHAR_255_COLUMNS VALUES (6, '中文测试 abc');
SQL> INSERT INTO ACTION_DB.CHAR_255_COLUMNS VALUES (7, '·~！@#￥%……&*（）-=——+{}【】、|；‘：“，。/《》？');

5. 指标端 MySQL 查看同步状况

mysql> SHOW CREATE TABLE ACTION_DB.CHAR_255_COLUMNS\G
*************************** 1. row ***************************
       Table: CHAR_255_COLUMNS
Create Table: CREATE TABLE `CHAR_255_COLUMNS` (`COL1` int(11) DEFAULT NULL,
  `COL2` char(255) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
1 row in set (0.00 sec)

mysql> SELECT * FROM ACTION_DB.CHAR_255_COLUMNS;
+------+-----------------------------------------------------------------------------+
| COL1 | COL2                                                                        |
+------+-----------------------------------------------------------------------------+
|    0 | NULL                                                                        |
|    1 | abcdefghijklmnopqrstuvwxyz                                                  |
|    2 | ABCDEFGHIJKLMNOPQRSTUVWXYZ                                                  |
|    3 | 1234567890                                                                  |
|    4 | 1234567890                                                                  |
|    5 | ~`!@#$%^&*()-=_+{}[]|\:;<>,.?/                                              |
|    6 | 中文测试 abc                                                                  |
|    7 | ·~！@#￥%……&*（）-=——+{}【】、|；‘：“，。/《》？|
+------+-----------------------------------------------------------------------------+
8 rows in set (0.01 sec)

四、应用限度

因为 Oracle 和 MySQL 是异构数据库，所以在源端 Oracle 能执行的 Oracle SQL 语句通过 DTLE 转换到指标端的 MySQL SQL 语句后有可能无奈正确执行。比方 Oracle 反对数值范畴 MySQL 不反对，Oracle 的 DATE 类型反对公元前的年份而 MySQL 的 datetime 只能为公元后的年份等等。遇到这些状况，DTLE 的默认行为是报错并且进行同步。

如果须要跳过这种阻塞状况，能够批改 DTLE 的环境变量而后重新启动 DTLE 服务。

shell> vi /etc/systemd/system/multi-user.target.wants/dtle-nomad.service
# 增加
[Service]
Environment="SkipErr=true"

shell> systemctl daemon-reload
shell> systemctl restart dtle-nomad

如果在应用 DTLE 时发现了任何问题，请及时分割咱们。

DTLE repo：https://github.com/actiontech…

DTLE docs：https://actiontech.github.io/…

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