- Release Notes and Announcements
- Product Introduction
- Purchase Guide
- Getting Started
- Preparations
- Business Evaluation
- Network Preparation
- DTS Service Permission Preparation
- Database and Permission Preparation
- Configuring Binlog in Self-Built MySQL
- Data Migration
- Databases Supported by Data Migration
- Cross-Account TencentDB Instance Migration
- Migration to MySQL Series
- Migrating to MySQL
- Migrating to MariaDB
- Migrating to TDSQL-C for MySQL
- Migrating to TDSQL MySQL
- Migrating to TDSQL TDStore
- Advanced Operations for MySQL Series Migration
- Processing for MySQL Series Pre-Check Failure
- Database Connection Check
- Peripheral Check
- Version Check
- Source Instance Permission Check
- Partial Database Parameter Check
- Target Instance Permission Check
- Target Database Content Conflict Check
- Target Database Space Check
- Binlog Parameter Check
- Foreign Key Dependency Check
- View Check
- Advanced Object Check
- Warning Item Check
- TDSQL Proxy Check
- TDSQL Kernel Check
- DDL Ring Linkage Synchronization Detection for Same Database and Table Objects
- DDL Synchronization Conflict Detection for the Same Target and Same Database and Table Object
- Offline Migration of MySQL Data
- Migrating to PostgreSQL
- Migration from PostgreSQL to TencentDB for PostgreSQL
- Migration from TDSQL-C PostgreSQL to TencentDB for PostgreSQL
- PostgreSQL Physical Migration
- Processing for PostgreSQL Series Pre-Check Failure
- Database Connection Check
- Object Dependency Check
- Version Check
- Source or Target Instance Permission Check
- Incremental Migration Pre Check
- Structural Compatibility Check
- Structural Conflict Check
- Account Conflict Check
- Parameter Configuration Conflict Check
- Plugin Compatibility Check
- Multi Task Conflict Detection
- Long Transaction Check
- Migrating to MongoDB
- Migration from MongoDB to MongoDB
- Fix for Verification Failure
- MongoDB Connection Check
- Database/Table Content Conflict Check
- Source Database Node Role Check
- Oplog Check
- Source/Target Database Account Permission Check
- Database Version Check
- Database Capacity Check
- Target Database Load Check
- ShardKey Check
- Source Database Balancer Check
- Time Series Collection Verification
- Compression Algorithm Verification
- MongoDB Data Consistency Verification
- Migrating to SQL Server
- Migrating to TencentDB for Redis
- Migrating to KeeWiDB
- Task Management
- Task Status Description
- Viewing Task
- Configuring Task
- Verifying Task
- Start Task
- Retrying Task (MySQL)
- Retrying Task (Redis)
- Speed Limit (MySQL)
- Speed Limit (Redis)
- Complete Task
- Terminating Task
- Deleting Task
- Pausing Task
- Resuming Task
- Changing Configuration
- Terminating Task
- Deisolating Task
- Deleting Task
- Managing Tag
- Creating a Similar Task
- Viewing Log
- Data Sync
- Databases Supported by Data Sync
- Cross-Account TencentDB Instance Sync
- Sync to MySQL series
- Sync to MySQL
- Sync to MariaDB
- Sync to TDSQL-C for MySQL
- Sync to TDSQL for MySQL
- Sync to TDSQL TDStore
- MySQL Series Advanced Sync Operations
- MySQL series Pre Validation Failed Processing
- Database Connection Check
- Peripheral Check
- Version Check
- Source Instance Permission Check
- Partial Database Parameter Check
- Target Database Content Conflict Check
- Target Database Space Check
- Binlog Parameter Check
- Foreign Key Dependency Check
- View Check
- Advanced Object Check
- Warning Item Check
- TDSQL Proxy Check
- TDSQL kernel check
- DLL Ring Sync Check for Single Database/Table Object
- DLL Sync Conflict Check for Single Database/Table Object in the Same Target
- Synchronize to PostgreSQL
- Synchronization from PostgreSQL to PostgreSQL
- PostgreSQL Pre Validation does not Pass Processing
- Database Connection Check
- Object Dependency Check
- Version Check
- Source or Target Instance Permission Check
- Incremental Migration Pre Check
- Structural Compatibility Check
- Structural Conflict Check
- Account Conflict Check
- Parameter Configuration Conflict Check
- Plugin Compatibility Check
- Primary Key Dependency Check
- Check the Key Parameters of the Instance
- Multi Task Conflict Detection
- Synchronize to Kafka
- Task Management
- Task Status Description
- Viewing Task
- Configuring Task
- Verifying Task
- Starting Task
- Retrying Task (MySQL)
- Speed Limit
- Stopping Task
- Modify Sync configuration
- Pausing Task
- Resuming Task
- Resetting Task
- Deleting Task
- Changing Configuration
- Pay-as-You-Go to Monthly Subscription
- Terminating/Returning Instance
- Renewing Task
- Deisolating Task
- Deleting Instance
- Creating a Similar Task
- Viewing Log
- Deleting Task
- Data Subscription (Kafka Edition)
- Databases Supported by Data Subscription
- MySQL series Data Subscription
- Creating MySQL or TDSQL for MySQL Data Subscription
- Creating TDSQL for MySQL Data Subscription
- Creating MariaDB/Percona Data Subscription
- Consuming MySQL Data
- Advanced Subscription Operations
- Fix for Verification Failure
- Data Subscription for TDSQL PostgreSQL
- MongoDB Data Subscription
- Task Management
- Consumption Management
- Fix for Verification Failure
- Cutover Description
- Monitoring and Alarms
- Ops Management
- Practical Tutorial
- Synchronizing Local Database to the Cloud
- Creating Two-Way Sync Data Structure
- Creating Many-to-One Sync Data Structure
- Creating Multi-Site Active-Active IDC Architecture
- Selecting Data Sync Conflict Resolution Policy
- Using CLB as Proxy for Cross-Account Database Migration
- Migrating Self-Built Databases to Tencent Cloud Databases via CCN
- Best Practices for DTS Performance Tuning
- FAQs
- Error Handling
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- (NewDTS) Data Migration APIs
- DescribeMigrationJobs
- ModifyMigrationJob
- CompleteMigrateJob
- DescribeMigrationDetail
- CreateMigrationService
- CreateMigrateCheckJob
- DescribeMigrationCheckJob
- SkipCheckItem
- StartMigrateJob
- StopMigrateJob
- ResumeMigrateJob
- RecoverMigrateJob
- ModifyMigrateName
- ModifyMigrateJobSpec
- IsolateMigrateJob
- DestroyMigrateJob
- DescribeMigrateDBInstances
- PauseMigrateJob
- ContinueMigrateJob
- Data Sync APIs
- DescribeSyncJobs
- ModifySyncJobConfig
- CreateModifyCheckSyncJob
- DescribeModifyCheckSyncJobResult
- StartModifySyncJob
- CreateSyncJob
- ConfigureSyncJob
- CreateCheckSyncJob
- SkipSyncCheckItem
- DescribeCheckSyncJobResult
- StartSyncJob
- StopSyncJob
- ResumeSyncJob
- ResizeSyncJob
- RecoverSyncJob
- IsolateSyncJob
- DestroySyncJob
- PauseSyncJob
- ContinueSyncJob
- Data Consistency Check APIs
- Data Types
- Error Codes
- DTS API 2018-03-30
- SDK Documentation
- Service Agreement
- Release Notes and Announcements
- Product Introduction
- Purchase Guide
- Getting Started
- Preparations
- Business Evaluation
- Network Preparation
- DTS Service Permission Preparation
- Database and Permission Preparation
- Configuring Binlog in Self-Built MySQL
- Data Migration
- Databases Supported by Data Migration
- Cross-Account TencentDB Instance Migration
- Migration to MySQL Series
- Migrating to MySQL
- Migrating to MariaDB
- Migrating to TDSQL-C for MySQL
- Migrating to TDSQL MySQL
- Migrating to TDSQL TDStore
- Advanced Operations for MySQL Series Migration
- Processing for MySQL Series Pre-Check Failure
- Database Connection Check
- Peripheral Check
- Version Check
- Source Instance Permission Check
- Partial Database Parameter Check
- Target Instance Permission Check
- Target Database Content Conflict Check
- Target Database Space Check
- Binlog Parameter Check
- Foreign Key Dependency Check
- View Check
- Advanced Object Check
- Warning Item Check
- TDSQL Proxy Check
- TDSQL Kernel Check
- DDL Ring Linkage Synchronization Detection for Same Database and Table Objects
- DDL Synchronization Conflict Detection for the Same Target and Same Database and Table Object
- Offline Migration of MySQL Data
- Migrating to PostgreSQL
- Migration from PostgreSQL to TencentDB for PostgreSQL
- Migration from TDSQL-C PostgreSQL to TencentDB for PostgreSQL
- PostgreSQL Physical Migration
- Processing for PostgreSQL Series Pre-Check Failure
- Database Connection Check
- Object Dependency Check
- Version Check
- Source or Target Instance Permission Check
- Incremental Migration Pre Check
- Structural Compatibility Check
- Structural Conflict Check
- Account Conflict Check
- Parameter Configuration Conflict Check
- Plugin Compatibility Check
- Multi Task Conflict Detection
- Long Transaction Check
- Migrating to MongoDB
- Migration from MongoDB to MongoDB
- Fix for Verification Failure
- MongoDB Connection Check
- Database/Table Content Conflict Check
- Source Database Node Role Check
- Oplog Check
- Source/Target Database Account Permission Check
- Database Version Check
- Database Capacity Check
- Target Database Load Check
- ShardKey Check
- Source Database Balancer Check
- Time Series Collection Verification
- Compression Algorithm Verification
- MongoDB Data Consistency Verification
- Migrating to SQL Server
- Migrating to TencentDB for Redis
- Migrating to KeeWiDB
- Task Management
- Task Status Description
- Viewing Task
- Configuring Task
- Verifying Task
- Start Task
- Retrying Task (MySQL)
- Retrying Task (Redis)
- Speed Limit (MySQL)
- Speed Limit (Redis)
- Complete Task
- Terminating Task
- Deleting Task
- Pausing Task
- Resuming Task
- Changing Configuration
- Terminating Task
- Deisolating Task
- Deleting Task
- Managing Tag
- Creating a Similar Task
- Viewing Log
- Data Sync
- Databases Supported by Data Sync
- Cross-Account TencentDB Instance Sync
- Sync to MySQL series
- Sync to MySQL
- Sync to MariaDB
- Sync to TDSQL-C for MySQL
- Sync to TDSQL for MySQL
- Sync to TDSQL TDStore
- MySQL Series Advanced Sync Operations
- MySQL series Pre Validation Failed Processing
- Database Connection Check
- Peripheral Check
- Version Check
- Source Instance Permission Check
- Partial Database Parameter Check
- Target Database Content Conflict Check
- Target Database Space Check
- Binlog Parameter Check
- Foreign Key Dependency Check
- View Check
- Advanced Object Check
- Warning Item Check
- TDSQL Proxy Check
- TDSQL kernel check
- DLL Ring Sync Check for Single Database/Table Object
- DLL Sync Conflict Check for Single Database/Table Object in the Same Target
- Synchronize to PostgreSQL
- Synchronization from PostgreSQL to PostgreSQL
- PostgreSQL Pre Validation does not Pass Processing
- Database Connection Check
- Object Dependency Check
- Version Check
- Source or Target Instance Permission Check
- Incremental Migration Pre Check
- Structural Compatibility Check
- Structural Conflict Check
- Account Conflict Check
- Parameter Configuration Conflict Check
- Plugin Compatibility Check
- Primary Key Dependency Check
- Check the Key Parameters of the Instance
- Multi Task Conflict Detection
- Synchronize to Kafka
- Task Management
- Task Status Description
- Viewing Task
- Configuring Task
- Verifying Task
- Starting Task
- Retrying Task (MySQL)
- Speed Limit
- Stopping Task
- Modify Sync configuration
- Pausing Task
- Resuming Task
- Resetting Task
- Deleting Task
- Changing Configuration
- Pay-as-You-Go to Monthly Subscription
- Terminating/Returning Instance
- Renewing Task
- Deisolating Task
- Deleting Instance
- Creating a Similar Task
- Viewing Log
- Deleting Task
- Data Subscription (Kafka Edition)
- Databases Supported by Data Subscription
- MySQL series Data Subscription
- Creating MySQL or TDSQL for MySQL Data Subscription
- Creating TDSQL for MySQL Data Subscription
- Creating MariaDB/Percona Data Subscription
- Consuming MySQL Data
- Advanced Subscription Operations
- Fix for Verification Failure
- Data Subscription for TDSQL PostgreSQL
- MongoDB Data Subscription
- Task Management
- Consumption Management
- Fix for Verification Failure
- Cutover Description
- Monitoring and Alarms
- Ops Management
- Practical Tutorial
- Synchronizing Local Database to the Cloud
- Creating Two-Way Sync Data Structure
- Creating Many-to-One Sync Data Structure
- Creating Multi-Site Active-Active IDC Architecture
- Selecting Data Sync Conflict Resolution Policy
- Using CLB as Proxy for Cross-Account Database Migration
- Migrating Self-Built Databases to Tencent Cloud Databases via CCN
- Best Practices for DTS Performance Tuning
- FAQs
- Error Handling
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- (NewDTS) Data Migration APIs
- DescribeMigrationJobs
- ModifyMigrationJob
- CompleteMigrateJob
- DescribeMigrationDetail
- CreateMigrationService
- CreateMigrateCheckJob
- DescribeMigrationCheckJob
- SkipCheckItem
- StartMigrateJob
- StopMigrateJob
- ResumeMigrateJob
- RecoverMigrateJob
- ModifyMigrateName
- ModifyMigrateJobSpec
- IsolateMigrateJob
- DestroyMigrateJob
- DescribeMigrateDBInstances
- PauseMigrateJob
- ContinueMigrateJob
- Data Sync APIs
- DescribeSyncJobs
- ModifySyncJobConfig
- CreateModifyCheckSyncJob
- DescribeModifyCheckSyncJobResult
- StartModifySyncJob
- CreateSyncJob
- ConfigureSyncJob
- CreateCheckSyncJob
- SkipSyncCheckItem
- DescribeCheckSyncJobResult
- StartSyncJob
- StopSyncJob
- ResumeSyncJob
- ResizeSyncJob
- RecoverSyncJob
- IsolateSyncJob
- DestroySyncJob
- PauseSyncJob
- ContinueSyncJob
- Data Consistency Check APIs
- Data Types
- Error Codes
- DTS API 2018-03-30
- SDK Documentation
- Service Agreement
Overview
During data sync, when users select objects, they can choose the level of repository objects and table objects, or even the column level. This article introduces column-level data sync.
Application Scope
Data sync links between MySQL, MariaDB, Percona, and TDSQL-C for MySQL.
Restrictions
1. Columns of primary keys and unique keys do not support filtering. The system will synchronize columns of primary keys and unique keys to the target by default. In special cases, if primary keys or unique keys are filtered, pre-validation will result in an error.
2. If the filtered column is a composite primary key, foreign key or partition column, or if the filtered column includes an index, then the source does not support DML operation on that column; otherwise, the task may report an error.
3. The interaction explanation between column filtering and view is as follows:
If the view is selected in the sync object, then the related column data of the view needs to be synced as well and cannot be filtered; otherwise, the task will report an error.
If the view is selected in the sync object, and subsequently, the source database associates the created view with the system database table, then column filtering cannot be used in the sync task at the same time; otherwise, the task will report an error.
4. Special explanations for the interaction between the Rename operation and the column filtering feature are as follows:
Table A underwent column filtering, the source then deleted Table A, and recreated another Table A with an identical structure. In this scenario, the created Table A will still undergo column filtering.
Table A underwent column filtering, then the source deleted Table A, and renamed Table B as Table A, with Tables A and B having identical table structures. In this scenario, the sync result for Table B will not undergo column filtering.
5. After column filtering is configured, modifying the sync configuration is not supported. Similarly, when the sync configuration is modified, filtering columns is not supported.
6. The interaction between column filtering and Where condition filtering is as follows:
If a table has undergone column filtering and the user also sets Where rules for this table, the user must ensure that the column names in the Where rules input are included in the table to be synced; otherwise, the Where rules can be set successfully, but subsequent task initiation will result in an error.
7. If the column X of Table A has been filtered, and the user executes the 'CREATE TABLE table_B like table_A' statement on the source, it is recommended to also filter the column X of Table B. In this scenario, DTS's sync of Table B will follow Table A's filtered structure. If the column X of Table B is not filtered, subsequent data updates to the column X of Table B on the source side will cause the DTS task to fail.
8. If the unique key column in the table object includes a function, then when the sync object checks that table, it cannot expand to the column dimension and cannot perform column filtering.
9. Only select scenarios that sync data instead of the table structure. This scenario requires users to create the same table structure on the target before starting the DTS task. If the task also needs column filtering settings, then the table structure created by the users on the target should be after column filtering; otherwise, sync to the target might result in errors.
Directions
1. Log in to the DTS console, choose Data Sync Page in the left sidebar to create a sync task.
2. In Set source and target databases, you can select table-level and column-level data in Source Database Object on the left; after they are checked, click 
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