TDengine 到 MySQL

选择对端数据库：

MySQL

数据链路

基本功能

功能	说明
Schema Migration	If the target schema does not exist, BladePipe will automatically generate and execute CREATE statements based on the source metadata and the mapping rule.
Full Data Migration	Migrate data by sequentially scanning data in tables and writing it in batches to the target database.
Incremental Data Sync	Sync of common DML like INSERT, UPDATE, DELETE is supported. UPDATE and DELETE for tables without primary keys are not synced by default (manual selection required).
Data Verification and Correction	Verify all existing data. Optionally, you can correct the inconsistent data based on verification results. Scheduled DataTasks are supported. For more information, see Create Verification and Correction DataJob.
Subscription Modification	Add, delete, or modify the subscribed tables with support for historical data migration. For more information, see Modify Subscription.
Position Resetting	Reset positions by offsets. Allow re-consumption of incremental data logs in a past period or since a specific offset.
Table Name Mapping	Support the mapping rules, namely, keeping the name the same as that in Source, converting the text to lowercase, converting the text to uppercase, truncating the name by "_digit" suffix.
Metadata Retrieval	Retrieve the target metadata with filtering conditions or target primary keys set from the source table.

高级功能

功能	说明
全量前清空目标数据	运行全量任务前清除老数据，包括重跑任务、定时全量迁移都会触发此能力
重建目标表	运行全量任务前重建目标表，包括重跑任务、定时全量迁移都会触发此能力
增量写入冲突策略	IGNORE: 主键冲突则忽略（不做写入），REPLACE: 主键冲突则整行替换
0 值时间处理	支持将 0 值时间设置成不同类型的值，防止写入对端报错
Custom Code	For more information, see Custom Code Processing, Debug Custom Code and Logging in Custom Code.
Setting Target Primary Key	Change the primary key to another field to facilitate data aggregation and other operations.
Data Filtering Conditions	Support data filtering using WHERE conditions, with SQL-92 as the SQL language. For more information, see Data Filtering.
Subtable Subscription Filtering Conditions	For supertable sync, BladePipe supports subtable subscription filtering by WHERE condition. All subtables are subscribed by default. For more information, see TDengine Query Topic.

使用示例

标题	详情
Sync Data from TDengine to MySQL	See Sync Data from TDengine to MySQL

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源端数据源

前置条件

条件	说明
账号权限	文档：TDengine 需要的权限
网络准备	迁移同步节点（sidecar）可连接 TDengine Websocket 端口，如 6041

任务参数

参数名称	说明
fullBatchSize	全量写入对端单批数据条数，对迁移性能影响大
fullPagingCount	关系型数据库源端扫描分页大小
consumeParallel	源端消费并发数，建议与 vnode 数量保持一致
supportTimestampToEpochNano	是否支持将时间戳转为纳秒级别整型数字

Tips: 通用参数配置请参考 通用参数及功能

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目标端数据源

前置条件

条件	说明
账号权限	文档：MySQL / MariaDB 需要的权限
网络准备	迁移同步节点（sidecar）可连接 MySQL / MariaDB 标准交互接口（如 3306）

任务参数

参数名称	说明
keyConflictStrategy	增量写入遇到主键冲突策略: IGNORE 冲突忽略（默认） REPLACE 冲突替换（可选）
dstWholeReplace	将 INSERT 和 UPDATE 操作变成对端整行覆盖
deCycle	双向同步过滤开关，过滤特定标记的 DML/DDL
specialSqlMode	初始化数据库连接时，可以设置特定的 SQL Mode
defaultGisSRID	设置 GIS 数据类型的 SRID
dstTimeZone	目标端时区，例如 +08:00, Asia/Shanghai, America/New_York等
increParallelApplyStrategy	关系型数据库对端写入数据并行策略： KEY: 以主键进行分区并行写入 TABLE: 以表进行分区并行写入 KEY_UPGRADE_TABLE: 以主键进行分区并行写入，若有更新唯一键的操作升级为表进行分区写入

Tips: 通用参数配置请参考 通用参数及功能