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文档中心数据传输服务数据迁移 MySQL 系列迁移高级操作迁移 Online DDL 临时表

迁移 Online DDL 临时表

最近更新时间：2023-01-31 16:53:25

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本页目录：

操作场景
使用 gh-ost、pt-online-schema-change（下文简称 pt-osc ）工具对源库中的表执行 Online DDL 操作，需要将 Online DDL 变更产生的临时表迁移到目标库。nDTS 支持在选择迁移对象时，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迁移。  
使用 gh-ost 工具对表 表名 做 Online DDL，DTS 支持迁移临时表 _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 支持迁移临时表 _表名_new、  _表名_old 到目标库。
适用范围
 MySQL、MariaDB、Percona、TDSQL-C MySQL 之间的数据迁移。
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迁移页，创建迁移任务。
2. 在“设置迁移选项及选择迁移对象”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 无法迁移其他临时表。这种情况迁移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），否则无法迁移 Online DDL 变更产生的临时表数据到目标数据库。
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