- Release Notes and Announcements
- User Tutorial
- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- Operation Overview
- Access Management
- SDK Connection
- Daily Instance Operation
- Viewing Instance Information
- Assigning Instance to Project
- Editing Instance Tag
- Setting Maintenance Time
- Changing Instance Specification
- Adjusting the Number of Connections
- Enabling/Disabling Read/Write Separation
- Clearing Instances
- Returning and Isolating Instance
- Restoring Isolated Instance
- Eliminating Instance
- Instance Upgrade
- Node Management
- Multi-AZ Deployment Management
- Backup and Restoration
- Data Migration
- Account and Password
- Parameter Configuration
- Slow Log
- Network and Security
- Monitoring and Alarms
- Event Management
- Global Replication
- Performance Optimization
- Sentinel Mode
- Development Guidelines
- Command Compatibility
- Troubleshooting
- Best Practices
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Instance APIs
- AddReplicationInstance
- AllocateWanAddress
- ChangeInstanceRole
- ChangeMasterInstance
- CleanUpInstance
- ClearInstance
- CloseSSL
- CreateInstanceAccount
- CreateReplicationGroup
- DeleteInstanceAccount
- DeleteReplicationInstance
- DescribeAutoBackupConfig
- DescribeBandwidthRange
- DescribeInstanceAccount
- DescribeInstanceDTSInfo
- DescribeInstanceZoneInfo
- DescribeInstances
- DescribeProxySlowLog
- DescribeSlowLog
- DescribeTendisSlowLog
- DestroyPostpaidInstance
- DestroyPrepaidInstance
- DisableReplicaReadonly
- EnableReplicaReadonly
- InquiryPriceCreateInstance
- InquiryPriceUpgradeInstance
- KillMasterGroup
- ModifyAutoBackupConfig
- ModifyInstance
- ModifyInstanceAccount
- ModifyInstanceReadOnly
- ModifyMaintenanceWindow
- ModifyNetworkConfig
- OpenSSL
- ReleaseWanAddress
- RenewInstance
- ResetPassword
- StartupInstance
- SwitchProxy
- UpgradeInstanceVersion
- UpgradeProxyVersion
- UpgradeSmallVersion
- UpgradeVersionToMultiAvailabilityZones
- DescribeCommonDBInstances
- ChangeReplicaToMaster
- CloneInstances
- CreateInstances
- DescribeInstanceDealDetail
- DescribeInstanceNodeInfo
- DescribeInstanceShards
- DescribeMaintenanceWindow
- DescribeParamTemplateInfo
- DescribeReplicationGroup
- DescribeSSLStatus
- DescribeTaskInfo
- DescribeTaskList
- ModfiyInstancePassword
- RemoveReplicationInstance
- UpgradeInstance
- DescribeInstanceEvents
- ModifyInstanceAvailabilityZones
- ModifyInstanceEvent
- SwitchAccessNewInstance
- DescribeInstanceSupportFeature
- Parameter Management APIs
- Other APIs
- Region APIs
- Monitoring and Management APIs
- Backup and Restoration APIs
- Data Types
- Error Codes
- FAQs
- Service Agreement
- Glossary
- Contact Us
- Release Notes and Announcements
- User Tutorial
- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- Operation Overview
- Access Management
- SDK Connection
- Daily Instance Operation
- Viewing Instance Information
- Assigning Instance to Project
- Editing Instance Tag
- Setting Maintenance Time
- Changing Instance Specification
- Adjusting the Number of Connections
- Enabling/Disabling Read/Write Separation
- Clearing Instances
- Returning and Isolating Instance
- Restoring Isolated Instance
- Eliminating Instance
- Instance Upgrade
- Node Management
- Multi-AZ Deployment Management
- Backup and Restoration
- Data Migration
- Account and Password
- Parameter Configuration
- Slow Log
- Network and Security
- Monitoring and Alarms
- Event Management
- Global Replication
- Performance Optimization
- Sentinel Mode
- Development Guidelines
- Command Compatibility
- Troubleshooting
- Best Practices
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Instance APIs
- AddReplicationInstance
- AllocateWanAddress
- ChangeInstanceRole
- ChangeMasterInstance
- CleanUpInstance
- ClearInstance
- CloseSSL
- CreateInstanceAccount
- CreateReplicationGroup
- DeleteInstanceAccount
- DeleteReplicationInstance
- DescribeAutoBackupConfig
- DescribeBandwidthRange
- DescribeInstanceAccount
- DescribeInstanceDTSInfo
- DescribeInstanceZoneInfo
- DescribeInstances
- DescribeProxySlowLog
- DescribeSlowLog
- DescribeTendisSlowLog
- DestroyPostpaidInstance
- DestroyPrepaidInstance
- DisableReplicaReadonly
- EnableReplicaReadonly
- InquiryPriceCreateInstance
- InquiryPriceUpgradeInstance
- KillMasterGroup
- ModifyAutoBackupConfig
- ModifyInstance
- ModifyInstanceAccount
- ModifyInstanceReadOnly
- ModifyMaintenanceWindow
- ModifyNetworkConfig
- OpenSSL
- ReleaseWanAddress
- RenewInstance
- ResetPassword
- StartupInstance
- SwitchProxy
- UpgradeInstanceVersion
- UpgradeProxyVersion
- UpgradeSmallVersion
- UpgradeVersionToMultiAvailabilityZones
- DescribeCommonDBInstances
- ChangeReplicaToMaster
- CloneInstances
- CreateInstances
- DescribeInstanceDealDetail
- DescribeInstanceNodeInfo
- DescribeInstanceShards
- DescribeMaintenanceWindow
- DescribeParamTemplateInfo
- DescribeReplicationGroup
- DescribeSSLStatus
- DescribeTaskInfo
- DescribeTaskList
- ModfiyInstancePassword
- RemoveReplicationInstance
- UpgradeInstance
- DescribeInstanceEvents
- ModifyInstanceAvailabilityZones
- ModifyInstanceEvent
- SwitchAccessNewInstance
- DescribeInstanceSupportFeature
- Parameter Management APIs
- Other APIs
- Region APIs
- Monitoring and Management APIs
- Backup and Restoration APIs
- Data Types
- Error Codes
- FAQs
- Service Agreement
- Glossary
- Contact Us
Limits on Region and AZ
The global replication feature can replicate data in the same AZ or across AZs between any Tencent Cloud regions no matter where instances in the replication group are deployed. Currently, only the following regions and AZs support global replication, and AZs of instances in a global replication group cannot be adjusted.
Region | AZ |
Hong Kong (China) | Hong Kong Zones 2 and 3 |
Chengdu | Chengdu Zone 1 |
Virginia | Virginia Zone 2 |
Shanghai | Shanghai Zones 4 and 5 |
Beijing | Beijing Zones 5 and 7 |
Guangzhou | Guangzhou Zones 4, 5, and 6 |
Tianjin | Tianjin Zone 2 |
Nanjing | Nanjing Zones 2 and 3 |
Singapore | Singapore Zone 2 |
Shenzhen | Shenzhen Zone 4 |
Limits on the version and architecture of global replication group instances
Global replication supports instances running on 4.0 Standard Architecture, 4.0 Cluster Architecture, 5.0 Standard Architecture, and 5.0 Cluster Architecture.
The architectures of instances in a replication group cannot be changed; for example, you cannot change an instance from Cluster Architecture to Standard Architecture.
The version and architecture of instances to be added to a replication group must be the same as those of the master instance specified during group creation.
Limits on the specifications of global replication group instances
We recommend that you set the number of shards for instances in the replication group to the nth power of 2, such as 8, 16, 32, and 64 (maximum value).
When creating a replication group, you must specify a master instance with at least two replicas for the group.
Currently, you can add up to four instances in a global replication group in the following deployment schemes: one master and three read-only instances, four master instances, or two master and two read-only instances.
The specifications of instances to be added to a replication group must be the same as those of existing instances in the group, and their memory capacity must be greater than or equal to the used capacity of the master instance specified during group creation.
When you change the specifications, all instances in a replication group must have the same specifications; otherwise, performance or capacity problems may occur.
Limits on the parameter settings
The
maxmemory-policy parameter of instances in a global replication group must be set to noeviction.Limits on Command Sync
The FLUSHDB or FLUSHALL command will be synced to all instances in the replication group. Therefore, run them with caution.
The Pub and Sub command groups will not be synced. We recommend that you use the
Stream data structure to replicate notification messages across regions.When the RESTORE command is synced, if the target instance has the same key, it will not be executed.
Limits on the sync granularity
Currently, syncing is performed at the instance granularity, that is, all instance data will be synced. You cannot choose to sync partial instance data.
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