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- Added Authentication APIs
- API Authentication Upgrade
- TencentDB for MySQL API 2.0 Discontinuation
- Monitoring Module Upgrade in Shanghai Region
- Monitoring Metric Optimization
- Network Architecture Upgrade
- Change of APIs for Querying the Specifications of Purchasable Database Instances
- Replacement of Certain Old Database Proxy APIs
- Added Advanced Monitoring Metrics
- Change of Calculation Formula for Memory Utilization
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- Enhancing Business Load Capacity with TencentDB for MySQL
- Setting up 2-Region-3-DC Disaster Recovery Architecture
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- Data Types
- Error Codes
- FAQs
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- Reference
- Glossary
- Contact Us
- Preset Plugin List
- Release Notes and Announcements
- Release Notes
- Announcements
- Announcement on Some APIs with CAM Authentication Integrated
- Announcement on Some APIs with CAM Authentication Integrated
- Notice on Elimination of Some Indicators in Event Alarms
- Commercial Billing for Database Proxy
- TencentDB for MySQL Audit Upgrade
- Added Authentication APIs
- API Authentication Upgrade
- TencentDB for MySQL API 2.0 Discontinuation
- Monitoring Module Upgrade in Shanghai Region
- Monitoring Metric Optimization
- Network Architecture Upgrade
- Change of APIs for Querying the Specifications of Purchasable Database Instances
- Replacement of Certain Old Database Proxy APIs
- Added Advanced Monitoring Metrics
- Change of Calculation Formula for Memory Utilization
- Monitoring Module Upgrade and Optimization in Guangzhou and Shanghai Regions
- Monitoring Module Upgrade
- Parameter Template and Instance Purchase Process Optimization
- Binlog Will Take up Disk Space
- User Tutorial
- Product Introduction
- Tencent Kernel TXSQL
- Overview
- Kernel Version Release Notes
- Functionality Features
- Performance Features
- Security Features
- Stability Features
- TXRocks Engine
- Purchase Guide
- Getting Started
- Database Audit
- MySQL Cluster Edition
- Operation Guide
- Use Limits
- Operation Overview
- Instance Management and Maintenance
- Instance Upgrade
- CPU Elastic Expansion
- Read-Only/Disaster Recovery Instances
- Database Proxy
- Account Management
- Database Management Center (DMC)
- Parameter Configuration
- Network and Security
- Backup and Rollback
- Data Migration
- Monitoring and Alarms
- Operation Logs
- Tag
- Practical Tutorial
- Usage Specifications of TencentDB for MySQL
- Configuring Automatic Application Reconnection
- Impact of Modifying MySQL Source Instance Parameters
- Limits on Automatic Conversion from MyISAM to InnoDB
- Creating VPCs for TencentDB for MySQL
- Enhancing Business Load Capacity with TencentDB for MySQL
- Setting up 2-Region-3-DC Disaster Recovery Architecture
- Improving TencentDB for MySQL Performance with Read/Write Separation
- Migrating Data from InnoDB to RocksDB with DTS
- Building LAMP Stack for Web Application
- Building Drupal Website
- Building All-Scenario High-Availability Architecture
- Calling MySQL APIs in Python
- White Paper
- Troubleshooting
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Instance APIs
- StopCpuExpand
- StartCpuExpand
- DescribeCpuExpandStrategy
- AddTimeWindow
- BalanceRoGroupLoad
- CloseWanService
- CreateDBInstance
- CreateDBInstanceHour
- CreateRoInstanceIp
- DeleteTimeWindow
- DescribeCdbZoneConfig
- DescribeDBFeatures
- DescribeDBInstanceCharset
- DescribeDBInstanceConfig
- DescribeDBInstanceGTID
- DescribeDBInstanceInfo
- DescribeDBInstanceRebootTime
- DescribeDBSwitchRecords
- DescribeRoGroups
- DescribeRoMinScale
- DescribeTagsOfInstanceIds
- DescribeTimeWindow
- InitDBInstances
- IsolateDBInstance
- ModifyAutoRenewFlag
- ModifyDBInstanceName
- ModifyDBInstanceProject
- ModifyDBInstanceVipVport
- ModifyInstanceTag
- ModifyRoGroupInfo
- ModifyTimeWindow
- OfflineIsolatedInstances
- OpenDBInstanceEncryption
- OpenDBInstanceGTID
- OpenWanService
- ReleaseIsolatedDBInstances
- RenewDBInstance
- RestartDBInstances
- StartReplication
- StopReplication
- SwitchDBInstanceMasterSlave
- SwitchDrInstanceToMaster
- SwitchForUpgrade
- UpgradeDBInstance
- UpgradeDBInstanceEngineVersion
- DescribeDBInstances
- DescribeDBZoneConfig
- CreateDeployGroup
- DeleteDeployGroups
- DescribeDeployGroupList
- ModifyNameOrDescByDpId
- Data Import APIs
- Database Proxy APIs
- AdjustCdbProxy
- AdjustCdbProxyAddress
- CloseCdbProxyAddress
- CreateCdbProxy
- CreateCdbProxyAddress
- DescribeCdbProxyInfo
- DescribeProxySupportParam
- ModifyCdbProxyAddressDesc
- ModifyCdbProxyAddressVipAndVPort
- ModifyCdbProxyParam
- CloseCDBProxy
- DescribeProxyCustomConf
- ReloadBalanceProxyNode
- SwitchCDBProxy
- UpgradeCDBProxyVersion
- Database Audit APIs
- Security APIs
- Task APIs
- Account APIs
- Backup APIs
- DescribeBackupDecryptionKey
- CreateBackup
- DeleteBackup
- DescribeBackupDownloadRestriction
- DescribeBackupEncryptionStatus
- DescribeBackupOverview
- DescribeBackupSummaries
- DescribeBinlogBackupOverview
- DescribeDataBackupOverview
- DescribeLocalBinlogConfig
- DescribeRemoteBackupConfig
- DescribeSlowLogs
- ModifyBackupDownloadRestriction
- ModifyBackupEncryptionStatus
- ModifyLocalBinlogConfig
- ModifyRemoteBackupConfig
- DescribeBackups
- DescribeBackupConfig
- ModifyBackupConfig
- DescribeBinlogs
- Rollback APIs
- Parameter APIs
- Database APIs
- Monitoring APIs
- Log-related API
- Data Types
- Error Codes
- FAQs
- Service Agreement
- Reference
- Glossary
- Contact Us
- Preset Plugin List
Switch Between Read-Write Nodes and Read-Only Nodes
Last updated: 2024-05-14 14:12:42
TencentDB for MySQL Cluster Edition instances support switching between read-write nodes and read-only nodes, i.e., primary/replica switch. In the event of an instance failure, the system will automatically switch a read-only node to a read-write node to ensure system availability and data integrity. This automatic switching is triggered under special circumstances such as failures. In addition to automatic switching, you can also perform manual switching through the console. This document introduces the read-write node switching for the Cluster Edition. For information on primary/replica switch for two-node and three-node instances, see Primary/Replica Switch.
Background
In enterprise-level applications, the database is usually a critical part of the business system. Any database failure or downtime can have a severe impact on business operations. Therefore, to ensure system availability and data integrity, it is necessary to adopt a high availability solution like primary/replica switch. This solution allows for a quick switch from a read-write node to a read-only node within the cluster in the event of a failure, preventing business interruptions and data loss.
Prerequisites
For instances of the TencentDB for MySQL Cluster Edition, see Purchase Methods for creation.
The instance is running, with no other tasks in progress.
Notes
During the read-write node switching process, there will be brief disconnections lasting a few seconds. It is recommended to perform the switching operation during off-peak business hours and ensure that your application has a reconnection mechanism.
Once the read-write node has been switched, the instance connection address remains unchanged. The original read-write node will serve as a read-only node, and applications will automatically connect to the new read-write node (which was previously a read-only node).
Directions
1. Log in to the MySQL Console. In the instance list, click Instance ID or Manage in the Operation column to enter the Instance Details page.
2. After going to Instance Details > Availability Information > Read-Write Node Availability Zone, click Read-Write Node Switch.
Note:
You can also directly find the target read-only instance under Instance Details > Instance Architecture Diagram, and click the Switch Icon on the topology chart to enter the Read-Write Node Switch popup.
3. In the pop-up, select the switch time, specify the node, check the notes, and then click OK.
During Maintenance Time: The read-write node switch will be carried out during the maintenance time. To modify the instance maintenance time, see Setting Instance Maintenance Time.
Upon Upgrade Completion: After the settings are completed, you can immediately perform read-write node switching.
4. After the instance status changes from Primary/Replica Switching to Running, the switch is completed.
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