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数据传输服务DTS
数据传输服务(Data Transmission Service) DTS支持关系型数据库、NoSQL、大数据(OLAP)等数据源间的数据传输。 它是一种集数据迁移、数据订阅及数据实时同步于一体的数据传输服务。数据传输致力于在公有云、混合云场景下，解决远距离、毫秒级异步数据传输难题。 它底层的数据流基础设施为阿里双11异地多活基础架构， 为数千下游应用提供实时数据流，已在线上稳定运行3年之久。 您可以使用数据传输轻松构建安全、可扩展、高可用的数据架构。
双向实时同步功能正式上线，助力用户轻松构建异地多活架构，有效提升业务访问体验，保证服务可持续性,
RDS->MaxCompute(原ODPS)/流计算(通过Datahub) 数据实时同步正式商业化，实现数据流式实时分析 RDS->分析型数据库AnalyticDB 数据实时同步正式发布，助力企业轻松实现准实时、低延迟的新型BI系统 Redis->Redis 数据迁移正式发布，支持业务不停写情况下，数据的平滑迁移
微信分享有礼：
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帮助与文档
数据传输 产品概述
如何创建上云迁移任务
增量迁移简单介绍
如何创建同步作业
数据传输产品概述
相比于传统数据迁移同步工具，我们提供更易用、安全可靠的服务
传统迁移同步工具
功能丰富数据传输支持同异构数据源之间的数据传输，提供迁移、订阅、同步多种传输功能
功能单一一般迁移工具只提供全量数据迁移功能，只有个别商业软件提供同步功能
传输性能高同地区内通过内网传输，传输粒度可细化到记录级别，全量迁移性能高达70MB/s，实时同步性能高达30000TPS
传输性能低迁移同步粒度只能细化到表级别，迁移同步性能差
安全可靠性
可靠性高云服务形态，任何一个节点故障，任务立马被其他健康节点接管，链路秒级恢复。 模块之间通过token认证，使用安全传输协议，链路可靠性高达99.95%
可靠性差一般迁移工具都是单机版本，一旦服务器宕机，那么传输链路即中断。
简单易用提供可视化管理界面，传输链路配置简单，链路状态透明直观，极大降低使用成本。 支持断点续传，可有效解决因硬件、网络等异常导致的链路中断
使用复杂一般迁移工具配置步骤复杂，且链路状态不透明，使用成本高。 一般迁移工具不支持断点续传，一旦出现网络、硬件异常就会导致链路中断，易用性差
数据传输 产品功能
支持同异构数据源之间的数据迁移
同构数据源间数据迁移：支持MySQL、SQLServer、PostgreSQL、MongoDB 等多种数据源到RDS的上云迁移
异构数据源间数据迁移：支持Oracle->MySQL、Oracle->PPAS等异构数据源间的数据迁移
支持热迁移，降低系统迁移过程中的应用停机时间
热迁移：支持增量迁移，增量迁移可以将数据迁移过程中源数据库产生的增量数据同步到目标库。使用增量迁移功能，可以将系统迁移过程中的应用停机时间降低到分钟级别
支持简单的ETL，轻松实现复杂的迁移逻辑
对象名映射：支持对象名映射，即支持库名、表名、列名三级映射；例如可以将源实例的A库数据迁移到目标实例的B库
数据过滤：支持迁移数据过滤。在配置数据迁移任务时，可以对迁移的表配置where条件，通过匹配Where条件，过滤需要迁移的数据
DTS数据迁移支持的功能如下表:
全量数据迁移
增量数据迁移
& &MySQL-&MySQL
& &Oracle-&MySQL
& &SQLServer-&SQLServer
& &PostgreSQL-&PostgreSQL
& &Redis-&Redis
& &MongoDB-&MongoDB
& &MySQL-&DRDS
& &MySQL-&OceanBase
& &MySQL-&PetaData
& &Oracle-&PPAS
支持多种数据源间的数据实时同步，轻松解决异地灾备等应用场景
支持数据源：支持RDS->RDS/MaxCompute/流计算/AnalyticDB 之间的实时同步
支持地区：支持杭州、北京、青岛、上海、深圳、美国、新加坡等地区之间的数据实时同步高级功能：同步链路搭建完成后，同步过程中，支持动态修改同步对象、动态修改同步速度等多种操作
DTS数据同步支持的功能如下表:
& &RDS For MySQL-&RDS For MySQL
& &RDS For MySQL-&分析型数据库ADS
& &RDS For MySQL-&MaxCompute(原ODPS)
& &RDS For MySQL-&Datahub(可在流计算中进行流式分析)
支持增量数据实时订阅，轻松解决本地灾备、消息转发等应用场景
支持数据源：支持RDS MySQL binlog的实时订阅，实现MySQL增量数据的实时订阅
支持地区：支持杭州、北京、青岛、上海、深圳、美国、香港、新加坡等地区之间的RDS实例增量数据的实时订阅高级功能：订阅通道搭建完成后，支持动态修改订阅对象、增量数据在线查看、消费时间修改等多种操作
完善的监控体系
完善性能监控体系，大幅度降低运维成本
性能指标：提供数据订阅流量，实时同步流量，实时同步延迟，订阅消费延迟等多种性能监控视图，直观监控链路健康状况 监控体系：提供订阅通道状态、订阅消费延迟及同步链路延迟等链路信息的实时监控报警，随时随地了解链路动态
数据传输 典型应用场景
零停机上云迁移
异地多活(单元化)
降低跨地区访问延迟
如果要将本地数据库迁移到阿里云上，那么可以使用数据传输提供的数据迁移功能。数据迁移功能可以帮助您轻松实现数据一键上云。在数据传输控制台通过简单几个步骤的链路配置，即可开始数据的上云迁移。数据迁移支持的增量迁移功能可以实现在上云迁移过程中，本地业务继续提供服务，从而最大程度降低数据迁移期间应用停服时间。
[{"name":"caseweb"},{"name":"caseapp"},{"name":"casedianshang"},{"name":"casegame"},{"name":"casemedia"},{"name":"caseothers"}]
[{"result":"caseweb","user_cat_name_level1":[{"旅游":"false","网站":"true","o2o":"false","金融":"false","通讯社交":"false","教育":"false","音视频":"false","移动APP":"false","其它":"false","游戏":"false","IT与软件开发":"false","能源/交通运输/生产制造":"false","政府/事业单位":"false","医疗健康":"false","电子商务":"false","物联网":"false"}]},{"result":"caseapp","user_cat_name_level1":[{"旅游":"false","网站":"false","o2o":"false","金融":"false","通讯社交":"false","教育":"false","音视频":"false","移动APP":"true","其它":"false","游戏":"false","IT与软件开发":"false","能源/交通运输/生产制造":"false","政府/事业单位":"false","医疗健康":"false","电子商务":"false","物联网":"false"}]},{"result":"casedianshang","user_cat_name_level1":[{"旅游":"false","网站":"false","o2o":"false","金融":"false","通讯社交":"false","教育":"false","音视频":"false","移动APP":"false","其它":"false","游戏":"false","IT与软件开发":"false","能源/交通运输/生产制造":"false","政府/事业单位":"false","医疗健康":"false","电子商务":"true","物联网":"false"}]},{"result":"casegame","user_cat_name_level1":[{"旅游":"false","网站":"false","o2o":"false","金融":"false","通讯社交":"false","教育":"false","音视频":"false","移动APP":"false","游戏":"true","其它":"false","IT与软件开发":"false","能源/交通运输/生产制造":"false","政府/事业单位":"false","医疗健康":"false","电子商务":"false","物联网":"false"}]},{"result":"casemedia","user_cat_name_level1":[{"旅游":"false","网站":"false","o2o":"false","金融":"false","通讯社交":"false","教育":"false","音视频":"true","移动APP":"false","其它":"false","游戏":"false","IT与软件开发":"false","能源/交通运输/生产制造":"false","政府/事业单位":"false","医疗健康":"false","电子商务":"false","物联网":"false"}]},{"result":"caseothers","user_cat_name_level1":[{"旅游":"true","网站":"false","o2o":"true","金融":"true","通讯社交":"true","教育":"true","音视频":"false","移动APP":"false","游戏":"false","其它":"true","IT与软件开发":"true","能源/交通运输/生产制造":"true","政府/事业单位":"true","医疗健康":"true","电子商务":"false","物联网":"true"}]}]
[{"case":[{"current":"0","code":"caseweb"},{"current":"3","code":"caseapp"},{"current":"1","code":"casedianshang"},{"current":"3","code":"casegame"},{"current":"1","code":"casemedia"},{"current":"1","code":"caseothers"}],"code":"ecs"}]
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International注意：本文介绍了两款 Linux 实例常用远程连接兼数据传输工具，属于第三方软件，阿里云无责维护第三方软件安全。在执行任何有关数据安全问题的操作之前，您需要 创建快照 防止数据丢失。前提条件安全组已经放行相关...
支持，目前RDS-&ADS数据实时同步，是通过DTS数据订阅+ADS 同步Writer实现的。具体的任务配置方法详见： 使用阿里云数据传输DTS实现RDS到ADS数据实时同步
如果数据正常消费，那么数据传输控制台的消费位点就会正常往前走
如果数据订阅报如上的错误，一般原因可能有两个：1）SDK运行的服务器没有公网IP，不能连接数据传输服务的服务器 2）订阅通道的消费时间点不在订阅通道的数据范围之内
如果配置的任务迁移类型选择了结构迁移＋全量数据迁移＋增量数据迁移，那么迁移期间元数据库出现的数据变化，都会被DTS同步到目标实例
DTS的数据订阅可以订阅的增量数据包括：所有的增删改以及结构变更（DDL）
不能，目前数据传输服务的SDK还不能支持一个SDK订阅多个订阅通道的数据
可以，您可以使用数据传输服务DTS的数据迁移功能，配置RDS到本地自建MySQL实例的数据实时同步，实现主从架构
不会，DTS进行数据迁移时，其实是复制了源数据库的一份数据，并不会对源数据库的数据有任何影响。
这是因为MySQL中数据类型为date的数据，存储到binlog中时，数据格式存储为：YYYY:MM:DD, 即使数据写入时格式为：YYYY-MM-DD，数据存储到binlog中时，也会存储成YYYY:MM:DD格式
如果配置Oracle到RDS MySQL迁移任务时，在点击“授权白名单并进入下一步”时，如果报如上的错误，一般是由于数据传输服务器连接不上源Oracle数据库。当遇到此问题时，需要在Oracle安装服务器上执行netstat-ano 查看...
订阅的数据是源库每个写入变更在binlog文件中记录的日志，例如一条update语句更新了3个记录，那么在binlog中就会记录3条update，所以这时候订阅到的数据就是3条update
这种情况，可能是SDK代码中没有调用ackAsConsumed接口汇报消费位点导致的。...ackAsConsumed汇报位点，那么这缓存空间数据就不会删除，当缓存满时，就不能拉取新的数据，就会出现SDK卡住不能订阅数据现象
数据传输在数据迁移之前，会判断源或目标RDS实例是否设置了白名单，如果RDS实例限制了白名单，DTS服务器不能访问。那么DTS会在配置迁移任务时，将服务器的IP列表添加到RDS实例的白名单中，防止因为白名单限制，DTS...
不会，如果配置迁移任务时，要进行整个数据库的迁移，那么预检查时，会要求目标待迁入数据库为空库，如果不是空库，那么预检查的”目标库是否为空“项会报错。如果配置迁移任务时，只迁移几个表，那么预检查时，会...
数据会不一致，迁移任务单独做增量数据迁移时，增量迁移开始同步的增量数据为启动任务的时间。所以在增量迁移任务启动之前，源数据库产生的增量数据都不会被同步到目标实例。如果需要进行不停机迁移，建议配置任务时...
支持，DTS可以支持MongoDB增量数据实时同步。目前MongoDB数据实时同步功能放在数据迁移功能中，具体的任务配置方法详见：MongoDB 实例间数据实时同步
因为DTS进行的是逻辑迁移方式，它是将迁移数据封装成SQL后，同步到目标RDS实例中的，此时会在目标RDS实例中产生binlog数据，所以迁移过程中，RDS的空间大小可能比源数据库大。
可以，如果数据订阅只订阅数据变更，那么两边索引不同不会影响。但是如果订阅了结构变更，而且RDS上涉及到索引变更的话，可能会由于两边索引不同，导致结构变更在本地消费失败。
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