PolarDB-X
| Function | Description |
|---|---|
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. |
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. |
Metadata Retrieval | Retrieve the target metadata with filtering conditions from the source table. |
Advanced Functions
| Function | Description |
|---|---|
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. |
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. |
Limits
| Limit | Description |
|---|---|
Supported Version | Only support PolarDB-X 2.0. |
PolarDB-X 2.0 Character Set | Support utf8, utf8mb4, latin1. Other encodings are not yet tested. |
Source Database Restrictions | Incremental data sync is not supported if table names to be synced in the source PolarDB-X 2.0 contain uppercase letters. |
Prerequisites
| Prerequisite | Description |
|---|---|
Permissions for Account | Require read and write permissions for cloud database account.
|
Parameters
| Parameter | Description |
|---|---|
parseBinlogParallel | Number of threads for parallel parsing of Binlog in Incremental DataJobs. |
parseBinlogBufferSize | Size of the circular buffer for parsing Binlog in Incremental DataJobs. |
maxTransactionSize | Maximum number of data rows per transaction. If exceeded, the transaction will be split and flushed in parts. |
limitThroughputMb | Limit the throughput of incremental Binlogs. |
needJsonEscape | Escape special characters in JSON to be written to the target database. |
Tips: To modify the general parameters, see General Parameters and Functions.
Prerequisites
| Prerequisite | Description |
|---|---|
Permissions for Account | |
Port Preparation | Allow the migration and sync node (Worker) to connect to the MySQL/MariaDB port (e.g., 3306). |
Parameters
| Parameter | Description |
|---|---|
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: To modify the general parameters, see General Parameters and Functions.