OceanBase Migration Service

V4.2.6Community Edition

OMS Documentation
What's New
OMS Community Edition Introduction
- What is OMS Community Edition?
- Terms
- OMS Community Edition HA
- Architecture
  - Overview
  - Hierarchical functional system
  - Basic components
- Limitations
Quick Start
- Data migration process
- Data synchronization process
Deploy OMS Community Edition
- Deployment modes
- System and network requirements
- Memory and disk requirements
- Prepare the environment
- Deploy OMS Community Edition on a single node
- Deploy OMS Community Edition on multiple nodes in a single region
- Deploy OMS Community Edition on multiple nodes in multiple regions
- Integrate the OIDC protocol into OMS Community Edition to implement SSO
- Scale out OMS Community Edition
- Check the deployment
- Deploy a time-series database (Optional)
OMS Community Edition console
- Log on to the console of OMS Community Edition
- Overview
- User center
  - Configure user information
  - Change your logon password
  - Log off
Data migration
- Overview
- Migrate data from a MySQL database to OceanBase Database Community Edition
- Migrate data from HBase to OBKV
- Migrate incremental data from OBKV to HBase
- Migrate data from a Milvus database to OceanBase Database Community Edition
- Migrate data from a Redis database to an OBKV Redis database
- Migrate data between instances of OceanBase Database Community Edition
- Migrate data in active-active disaster recovery scenarios
- Migrate data from a TiDB database to OceanBase Database Community Edition
- Migrate data from a PostgreSQL database to OceanBase Database Community Edition
- Migrate data from a Qdrant database to OceanBase Database Community Edition
- Manage data migration tasks
  - View the details of a data migration task
  - Change the name of a data migration task
  - View and modify migration objects
  - Manage computing platforms
  - Use tags to manage data migration tasks
  - Perform batch operations on data migration tasks
  - Download and import settings of migration objects
  - Start and pause a data migration task
  - Release and delete a data migration task
- Features
  - DML filtering
  - DDL synchronization
  - Configure matching rules for migration objects
  - Wildcard rules
  - Rename a database table
  - Use SQL conditions to filter data
  - Create and update a heartbeat table
  - Schema migration mechanisms
  - Schema migration operations
  - Set an incremental synchronization timestamp
  - Direct load
- Supported DDL operations in incremental migration and limits
  - DDL synchronization from MySQL database to OceanBase Community Edition
    - Overview of DDL synchronization from a MySQL database to a MySQL tenant of OceanBase Database
    - CREATE TABLE
      - Create a table
      - Create a column
      - Create an index or a constraint
      - Create partitions
    - Data type conversion
    - ALTER TABLE
      - Modify a table
      - Operations on columns
      - Operations on constraints and indexes
      - Operations on partitions
    - TRUNCATE TABLE
    - RENAME TABLE
    - DROP TABLE
    - CREATE INDEX
    - DROP INDEX
    - DDL incompatibilities between MySQL database and OceanBase Community Edition
      - Overview
      - Incompatibilities of the CREATE TABLE statement
        Incompatibilities of CREATE TABLE
        Column types that are supported to create indexes or constraints
      - Incompatibilities of the ALTER TABLE statement
        Incompatibilities of ALTER TABLE
        Change the type of a constrained column
        Change the type of an unconstrained column
        Change the length of a constrained column
        Change the length of an unconstrained column
        Delete a constrained column
      - Incompatibilities of DROP INDEX operations
  - Supported DDL operations in incremental migration between MySQL tenants of OceanBase Database
Data synchronization
- Data synchronization overview
- Create a task to synchronize data from OceanBase Database Community Edition to a Kafka instance
- Create a task to synchronize data from OceanBase Database Community Edition to a RocketMQ instance
- Manage data synchronization tasks
  - View details of a data synchronization task
  - Change the name of a data synchronization task
  - View and modify synchronization objects
  - Use tags to manage data synchronization tasks
  - Perform batch operations on data synchronization tasks
  - Download and import the settings of synchronization objects
  - Start and pause a data synchronization task
  - Release and delete a data synchronization task
- Features
  - DML filtering
  - DDL synchronization
  - Configure matching rules for synchronization objects
  - Rename a topic
  - Use SQL conditions to filter data
  - Column filtering
  - Data formats
Create and manage data sources
- Create data sources
  - Create an OceanBase-CE data source
  - Create a MySQL data source
  - Create a TiDB data source
  - Create a Kafka data source
  - Create a RocketMQ data source
  - Create a PostgreSQL data source
  - Create an HBase data source
  - Create a Qdrant data source
  - Create a Milvus data source
  - Create a Redis data source
- Manage data sources
  - View data source information
  - Copy a data source
  - Edit a data source
  - Delete a data source
- Create a database user
- User privileges
- Enable binlogs for the MySQL database
OPS & Monitoring
- O&M overview
- Go to the overview page
- Server
  - View server information
  - Update the quota
  - View server logs
- Components
  - Store
    - Create a store
    - View details of a store
    - Update the configurations of a store
    - Start and pause a store
    - Delete a store
  - Incr-Sync
    - View details of an Incr-Sync component
    - Start and pause an Incr-Sync component
    - Migrate an Incr-Sync component
    - Update the configurations of an Incr-Sync component
    - Batch O&M
    - Delete an Incr-Sync component
  - Full-Import
    - View details of a Full-Import component
    - Pause a Full-Import component
    - Rerun and resume a Full-Import component
    - Update the configurations of a Full-Import component
    - Delete a Full-Import component
  - Full-Verification
    - View details of a Full-Verification component
    - Pause a Full-Verification component
    - Rerun and resume a Full-Verification component
    - Update the configurations of a Full-Verification component
    - Delete a Full-Verification component
  - Component parameters
    - Coordinator
    - Condition
    - Source Plugin
      - Overview
      - StoreSource
      - DataFlowSource
      - LogProxySource
      - KafkaSource (TiDB)
      - HBaseSource
    - Sink Plugin
      - Overview
      - JDBC-Sink
      - KafkaSink
      - DatahubSink
      - RocketMQSink
      - HBaseSink
    - Store parameters
      - Parameters of a MySQL store
      - Parameters of an OceanBase store
    - Parameters of the CM component
    - Parameters of the Supervisor component
    - Parameters of the Full-Verification component
- O&M Task
  - View O&M tasks
  - Skip a task or subtask
  - Retry a task or subtask
System management
- Permission Management
  - Overview
  - Manage users
  - Manage departments
- Alert center
  - View task alerts
  - View system alerts
  - Manage alert settings
- Associate with OCP
- System parameters
  - Modify system parameters
  - Modify HA configurations
OMS Community Edition O&M
- Manage OMS services
- OMS logs
- Component O&M
  - O&M operations for the Supervisor component
  - CLI-based O&M for the Connector component
  - O&M operations for the Store component
- Component tuning
  - Incr-Sync or Full-Import tuning
- Set throttling
Reference Guide
- API Reference
  - Overview
  - CreateProject
  - StartProject
  - StopProject
  - ResumeProject
  - ReleaseProject
  - DeleteProject
  - ListProjects
  - DescribeProject
  - DescribeProjectSteps
  - DescribeProjectStepMetric
  - DescribeProjectProgress
  - DescribeProjectComponents
  - ListProjectFullVerifyResult
  - StartProjectsByLabel
  - StopProjectsByLabel
  - CreateMysqlDataSource
  - CreateMySQLMasterSlaveDataSource
  - CreateOceanBaseDataSource
  - ListDataSource
  - CreateLabel
  - ListAllLabels
  - ListFullVerifyInconsistenciesResult
  - ListFullVerifyCorrectionsResult
  - UpdateStore
  - UpdateFullImport
  - UpdateIncrSync
  - UpdateFullVerification
- OMS error codes
- Alert Reference
  - oms_host_down
  - oms_host_down_migrate_resource
  - oms_host_threshold
  - oms_migration_failed
  - oms_migration_delay
  - oms_sync_failed
  - oms_sync_status_inconsistent
  - oms_sync_delay
- Telemetry parameters
Upgrade Guide
- Overview
- Upgrade OMS Community Edition in single-node deployment mode
- Upgrade OMS Community Edition in multi-node deployment mode
- FAQ
FAQ
- General O&M
  - How do I modify the resource quotas of an OMS container?
  - Clear files in the Store component
  - How do I troubleshoot the OMS server down issue?
  - Deploy InfluxDB to OMS Community Edition
  - Increase the disk space of the OMS host
- Task diagnostics
  - What do I do when a store does not have data of the timestamp requested by the downstream?
  - What do I do when OceanBase Store failed to access an OceanBase cluster through RPC?
- OPS & monitoring
  - What are the alert rules?
- Data synchronization
  - FAQ about synchronization to a message queue
    - What are the strategies for ensuring the message order in incremental data synchronization to Kafka
- Data migration
  - Full migration
    - How do I query the ID of a checker?
    - How do I query log files of the Checker component of OMS?
    - How do I query the verification result files of the Checker component of OMS?
    - What do I do if the destination table does not exist?
    - What can I do when the full migration failed due to LOB fields?
    - What do I do if garbled characters cannot be written into OceanBase Database V3.1.2?
  - Incremental synchronization
    - How do I skip DDL statements?
    - How do I update whitelists and blacklists?
    - What are the application scope and limits of ETL?
- Logon and password
  - What do I do if my logon password is locked?
- Installation and deployment
  - How do I upgrade Store?
  - How do I upgrade CDC?
  - What do I do when the "Failed to fetch" error is reported?
  - Change port numbers for components
  - Switch to the standby database

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Change the type of an unconstrained column

Last Updated：2024-10-10 08:05:52 Updated

This topic describes incompatibilities between MySQL databases and MySQL tenants of OceanBase Database when you change the type of an unconstrained column.

The following table describes the types to which you can change a column by executing the ALTER TABLE table_name MODIFY/CHANGE COLUMN DDL statement in a MySQL database and a MySQL tenant of OceanBase Database.

Note

In the following table, a hyphen (-) means N/A. 'All' means all types.

Column type in a MySQL database	Supported target type other than the original type	Column type in a MySQL tenant of OceanBase Database	Supported target type other than the original type
INT	All	INTEGER	BIGINT
TINYINT	All	TINYINT	INTEGER SMALLINT MEDIUMINT BIGINT BOOLEAN
SMALLINT	All	SMALLINT	INTEGER BIGINT MEDIUMINT
MEDIUMINT	All	MEDIUMINT	INTEGERBIGINT
BIGINT	All	BIGINT	-
BOOL	All	BOOLEAN	INTEGER TINYINT SMALLINT MEDIUMINT BIGINT
DECIMAL	All	DECIMAL	NUMERIC
NUMERIC	All	NUMERIC	DECIMAL
REAL	All	FLOAT	-
DOUBLE	All	DOUBLE	-
FLOAT	All	FLOAT	-
BIT	All	BIT	-
CHAR	All	CHAR	-
NCHAR	All	CHAR	-
VARCHAR	All	VARCHAR	TINYTEXT TEXT LONGTEXT MEDIUMTEXT
BINARY	All	BINARY	-
VARBINARY	All	VARBINARY	BLOB TINYBLOB MEDIUMBLOB LONGBLOB
LONG_VARBINARY	All	BLOB	-
YEAR	All	YEAR	-
DATE	All	DATE	-
TIME	All	TIME	-
TIMESTAMP	All	TIMESTAMP	-
DATETIME	All	DATETIME	-
TINYBLOB	All	TINYBLOB	BLOB LONGBLOB MEDIUMBLOB
MEDIUMBLOB	All	MEDIUMBLOB	-
BLOB	All	BLOB	-
LONGBLOB	All	LONGBLOB	-
TINYTEXT	All	TINYTEXT	TEXT LONGTEXT MEDIUMTEXT
MEDIUMTEXT	All	MEDIUMTEXT	-
TEXT	All	TEXT	-
LONGTEXT	All	LONGTEXT	-
ENUM	All	ENUM	-
SET	All	SET	-
JSON	All	JSON	-

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Change the type of an unconstrained column

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