BladePipe 1.9.0: New data pipelines, faster Oracle writes, and improved stability.
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PolarDB for MySQL 到 TiDB

选择对端数据库：
TiDB

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.

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 file position or timestamp. Allow re-consumption of incremental data logs in a past period or since a specific Binlog file and position.

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.

DDL Synchronization
  • ALTER TABLE ADD COLUMN, DROP COLUMN, MODIFY COLUMN, CHANGE COLUMN
  • RENAME TABLE
  • CREATE TABLE
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

Scheduled Full Data Migration

For more information, see Create Scheduled Full Data DataJob.

Custom Code

For more information, see Custom Code Processing, Debug Custom Code and Logging in Custom Code.

Data Filtering Conditions

Support data filtering using WHERE conditions, with SQL-92 as the SQL language. For more information, see Data Filtering.

限制和注意点

限制项说明
TiDB 数据类型

不支持地理位置类型

Source Character Set

Support utf8, utf8mb4, latin1. Other encodings have not been tested.

链路FAQ

源端数据源

前置条件

条件说明
账号权限

云数据库读写账号或高权限账号

开启 Binlog

云数据实例详情 > 配置与管理 > 参数配置 > 设置 loose_polar_log_bin 为 true

PolarDbMySQL 字符集

支持 utf8, utf8mb4, latin1, 其他编码暂未测试

任务参数

参数名称说明
parseBinlogParallel

增量解析 Binlog 的并发数

parseBinlogBufferSize

用于增量解析 Binlog 的环形队列大小

maxTransactionSize

单事务最大数据条数，超过则分段刷出

limitThroughputMb

限制增量 Binlog 流量

extraDDL

兼容额外的 DDL 同步，包括 PT, GHOST, ALI_DMS, PT_GHOST

needJsonEscape

将 json 中特殊字符进行转义，以写入到对端

Tips: 通用参数配置请参考 通用参数及功能

目标端数据源

前置条件

条件说明
账号权限

迁移库表的 INSERT, UPDATE, DELETE, DDL 权限

网络准备

迁移同步节点（sidecar）可连接 TiDB 标准交互接口（如 4000）

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

writeStrategy

对端写入策略，包含

  • ROW (单条，默认选项)
  • MULTI_SQL (多语句)

Tips: 通用参数配置请参考 通用参数及功能