MySQL to DynamoDB

Target DataSource：

DynamoDB

Connection

Basic Functions

Function	Description
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.

Advanced Functions

Function	Description
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
MySQL Storage Engine	Support InnoDB, MyISAM, AWS XEngine. Other storage engines have not been tested yet.
MySQL Character Set	Support utf8, utf8mb4, latin1. Other encodings have not been tested yet.

FAQ

• How to handle MySQL DataJob latency?

• What to do when binary Log cannot be found in MySQL Source?

• What to do when access to schema in MySQL Source is denied?

  Tip: MySQL source-related FAQ also applies to MySQL-based DataSources.

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Source

Prerequisites

Prerequisite	Description
Permissions for Account	See Permissions Required for MySQL/MariaDB.
Enabling Binlog	[mysqld] log-bin=mysql-bin # Enable Binlog binlog-format=ROW # Choose ROW mode binlog_row_image=FULL # Changes include all column data

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.
extraDDL	Support synchronization of additional DDL, including PT, GHOST, ALI_DMS, and PT_GHOST.
needJsonEscape	Escape special characters in JSON to be written to the target database.
fullDataSqlConditionEnabled	Add filtering conditions in SQL during source data scanning. It only works in Full Data migration.
srcTimeZone	Source time zone, e.g., +08:00, Asia/Shanghai, America/New_York, etc.

Tips: To modify the general parameters, see General Parameters and Functions.

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Target

Prerequisites

Prerequisite	Description
Accounts and Permissions	Documentation: Permissions Required for DynamoDB
Network Preparation	The sidecar node must be able to connect to the standard interactive interface of DynamoDB.

Parameters

Parameter	Description
writeParallel	Number of parallel writes to the target, which significantly affects migration or synchronization performance.
totalDataInMemMb	Batch write. Maximum data capacity in memory. Data will be flushed to the write queue if this capacity is exceeded or if the asyncFlushIntervalSec is reached.
asyncFlushIntervalSec	Batch write. Interval time for waiting to flush. Data will be flushed to the write queue if this time is exceeded or if the totalDataInMemMb is reached.
flushBatchMb	Maximum batch capacity per table. Data will be flushed to the write queue if this capacity is exceeded.
realFlushPauseSec	Waiting time for flushing data to DynamoDB. 0 means no waiting.
retryCount	Number of retries on write errors.
retryWaitTimeMs	Wait time for retrying on write errors (milliseconds).
maxBatchSize	Upper limit for the number of records per single write.

Tips: To modify the general parameters, see General Parameters and Functions.