TDengine
| 功能 | 说明 |
|---|---|
结构迁移 | 如目标不存在所选表，则自动根据源端元数据，结合映射生成对端创建语句并执行创建 |
全量数据迁移 | 逻辑迁移，通过顺序扫描表数据，将数据分批写入到对端数据库 |
增量实时同步 | 支持 INSERT, UPDATE, DELETE 常见 DML 同步 |
数据校验和订正 | 全量数据校验，并可选根据校验结果订正差异数据，支持定时，文档：创建定时校验订正任务 |
修改订阅 | 新增、删除、修改订阅表，支持历史数据迁移，文档：修改订阅 |
重置位点 | 支持按照 Offset 回溯位点，重新消费过去一段时间或指定位点开始的增量日志 |
表名映射 | 支持 和源端保持一致, 转小写, 转大写, 以'_数字'后缀截取 |
元数据检索 | 从源端表查对端，查询设置过过滤条件的，查询设置过对端主键的 |
高级功能
| 功能 | 说明 |
|---|---|
Removal of Target Data before Full Data Migration | Remove the existing data in the Target before running the Full Data Migration, applicable for DataJobs reruning and scheduled Full Data migrations. |
Recreating Target Table | Recreate target tables before running the Full Data Migration, applicable for DataJobs reruning and scheduled Full Data migrations. |
Incremental Data Write Conflict Resolution Rule | IGNORE: Ignore primary key conflicts (skip writing), REPLACE: Replace the entire row in case of primary key conflicts. |
Handling of Zero Value for Time | Allow setting zero value for time to different data types to prevent errors when writing to the Target. |
全库同步 | 支持源端新建、删除、修改表的 DDL 和数据同步，文档：创建全库同步任务 |
自定义代 码 | 文档1：创建自定义代码任务 |
设置目标主键 | 变更主键为其他字段，方便数据聚合等操作 |
数据过滤条件 | 支持 WHERE 条件进行数据过滤，内容为 SQL 92 子集，文档：创建数据过滤任务 |
子表订阅过滤条件 | 超级表同步支持 WHERE 条件进行子表订阅过滤，默认订阅全部子表，具体参考 TDengine Query Topic |
前置条件
| 条件 | 说明 |
|---|---|
Permissions for Account | |
Port Preparation | Allow the migration and sync node (Worker) to connect to the TDengine Websocket port (e.g., 6041). |
任务参数
| 参数名称 | 说明 |
|---|---|
fullBatchSize | The number of records written in a single batch to the target instance. It has a significant impact on migration performance. |
fullPagingCount | The page size for scanning a source relational database. |
consumeParallel | The number of concurrent consumption in source instance. It is recommended to be consistent with the number of vnode. |
supportTimestampToEpochNano | Whether to convert timestamps to nanosecond-level integers. |
Tips: 通用参数配置请参考 通用参数及功能
前置条件
| 条件 | 说明 |
|---|---|
Permissions for Account | |
Port Preparation | Allow the migration and sync node (Worker) to connect to the MySQL/MariaDB port (e.g., 3306). |
任务参数
| 参数名称 | 说明 |
|---|---|
keyConflictStrategy | Strategy for handling primary key conflicts during write in Incremental DataTask:
|
dstWholeReplace | Convert INSERT and UPDATE operations into full row replacement in the Target. |
deCycle | Enable filtering in bidirectional sync to filter DML/DDL with specific markers. |
specialSqlMode | Set a specific SQL mode when initializing the connection between databases. |
defaultGisSRID | Set the SRID for GIS data types. |
dstTimeZone | Target time zone, e.g., +08:00, Asia/Shanghai, America/New_York, etc. |
increParallelApplyStrategy | Parallel write strategy for relational databases in the Target:
|
Tips: 通用参数配置请参考 通用参数及功能