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文档中心数据传输服务数据同步 MySQL 系列同步高级操作同步 Online DDL 临时表

同步 Online DDL 临时表

最近更新时间：2023-03-31 14:14:55

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操作场景
使用 gh-ost、 pt-online-schema-change（下文简称 pt-osc ）等工具对源库中的表做 Online DDL，需要将 Online DDL 变更产生的临时表同步到目标库。
DTS 支持在选择同步对象时，提前关联对象表的临时表名，在后续源库产生临时表时一并进行同步。  
使用 gh-ost 工具对表 表名 做 Online DDL，DTS 支持同步临时表 _表名_ghc、_表名_gho、_表名_del 到目标库。 
使用 pt-osc 工具对表 表名 做 Online DDL，DTS 支持同步临时表 _表名_new、  _表名_old 到目标库。
适用范围
 同步 Online DDL 临时表支持的链路范围如下：
MySQL/MariaDB/Percona/TDSQL-C MySQL > MySQL
MySQL/MariaDB/Percona > MariaDB 
MySQL/MariaDB/TDSQL-C MySQL > TDSQL-C MySQL
MySQL/MariaDB/Percona/TDSQL-C MySQL > Kafka
MySQL/MariaDB/Percona > TDSQL TDStore
约束限制
表映射（表重命名）功能与迁移 Online DDL 临时表功能冲突，只能选择一个功能使用。
操作步骤
1. 登录 DTS 控制台，在左侧导航选择数据同步页，创建同步任务。
2. 在“设置同步选项和同步对象”步骤中，勾选是否同步 Online DDL 临时表，和 Online DDL 工具。
勾选 gh-ost，DTS 会将 gh-ost 工具产生的临时表名（_表名_ghc、_表名_gho、_表名_del）迁移到目标库。 
勾选 pt-osc， DTS 会将 pt-osc 工具产生的临时表名（_表名_new、 _表名_old）迁移到目标库。
说明
右方已选对象中，需要勾选指定的表对象，下面才会显示“是否同步 Online DDL 临时表”的按钮，勾选库名，或者勾选 Tables，无法显示“是否同步 Online DDL 临时表”的按钮。
如果源库中已存在与临时表名 _表名_new 、_表名_old 相同的表名，则 pt-osc 会产生其他临时表，由于 pt-osc 产生的其他临时表名并非固定，DTS 无法同步其他临时表。这种情况同步对象不能仅选择这个表，需要选择这个表所在的整个库（或者整个实例），否则无法同步 Online DDL 变更产生的临时表数据到目标数据库。
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