Distributed Cache Service
Distributed Cache Service
- What's New
- Function Overview
- Product Bulletin
-
Service Overview
- Infographics for Comparing DCS for Redis with Open-Source Redis
- What Is DCS?
- Application Scenarios
- Security
- DCS Instance Types
- DCS Instance Specifications
-
Command Compatibility
- Commands Supported and Disabled by DCS for Redis 4.0
- Commands Supported and Disabled by DCS for Redis 5.0
- Commands Supported and Disabled by DCS for Redis 6.0
- Commands Supported and Disabled in Web CLI
- Command Restrictions
- Other Command Usage Restrictions
- Commands Supported and Disabled by DCS for Redis 3.0 (Discontinued)
- Commands Supported and Disabled by DCS for Memcached (Discontinued)
- Disaster Recovery and Multi-Active Solution
- Cache Engine Differences
- Comparing DCS and Open-Source Cache Services
- Notes and Constraints
- Billing
- Permissions Management
- Basic Concepts
- Related Services
- Billing
- Getting Started
-
User Guide
- Process of Using DCS
- Creating a User and Granting DCS Permissions
- Buying a DCS Redis Instance
-
Accessing a DCS Redis Instance
- Configuring Redis Network Connections
- Controlling DCS Redis Access
-
Connecting to Redis on a Client
- Connecting to Redis on redis-cli
- Connecting to Redis on Jedis (Java)
- Connecting to Redis on Lettuce (Java)
- Connecting to Redis on Redisson (Java)
- Connecting to Redis on redis-py (Python)
- Connecting to Redis on go-redis (Go)
- Connecting to Redis on hiredis (C++)
- Connecting to Redis on StackExchange.Redis (C#)
- Connecting to Redis on phpredis (PHP)
- Connecting to Redis on predis (PHP)
- Connecting to Redis on ioredis (Node.js)
- Connecting to Redis on the Console
- Public Access to a DCS Redis 3.0 Instance (Discontinued)
- Accessing a DCS Memcached Instance (Discontinued)
-
Managing Instances
- Viewing and Modifying Basic Settings of a DCS Instance
- Viewing DCS Background Tasks
- Viewing Client Connection Information of a DCS Instance
- Modifying Configuration Parameters of a DCS Instance
- Configuring DCS Instance Parameter Templates
- Configuring DCS Instance Tags
- Renaming Critical Commands for DCS Instances
- Exporting a DCS Instance List
- Performing a Master/Standby Switchover for a DCS Instance
- Managing DCS Instance Shards and Replicas
- Backing Up or Restoring Instance Data
- Changing an Instance
- Managing Lifecycle of an Instance
- Diagnosing and Analyzing an Instance
- Migrating Instance Data
-
Testing Instance Performance
- Testing Redis Performance Using memtier_benchmark
- Testing Redis Performance Using redis-benchmark
- Comparing redis-benchmark and memtier_benchmark
-
Reference for a Redis Performance Test
- Test Data of Master/Standby DCS Redis 3.0 Instances
- Test Data of Proxy Cluster DCS Redis 3.0 Instances
- Test Data of Master/Standby DCS Redis 4.0 or 5.0 Instances
- Test Data of Proxy Cluster DCS Redis 4.0 or 5.0 Instances
- Test Data of Redis Cluster DCS Redis 4.0 or 5.0 Instances
- Test Data of Master/Standby DCS Redis 6.0 Instances
- Test Data of Redis Cluster DCS Redis 6.0 Instances
- Test Data of Redis Backup, Restoration, and Migration
- Applying for More DCS Quotas
- Viewing Monitoring Metrics and Configuring Alarms
- Viewing DCS Audit Logs
- Best Practices
-
API Reference
- Before You Start
- API Overview
- Calling APIs
- Examples
-
API V2
- Lifecycle Management
-
Instance Management
- Updating a Bandwidth Auto Scaling Policy
- Querying a Bandwidth Auto Scaling Policy
- Deleting a Bandwidth Auto Scaling Policy
- Querying Details of an Instance Parameter Modification Record
- Master/Standby Switchover
- Changing the Password
- Resetting a Password
- Querying DCS Instance Statuses
- Restarting DCS Instances or Clearing DCS Instance Data
- Querying Statistics of All Running Instances
- Enabling or Disabling Client IP Pass-through
- Modifying the Bandwidth of an Instance
- Enabling/Modifying Public Access
- Disabling Public Access to an Instance
- Switching Master/Replica Roles on a Cluster Shard
- Asynchronous Master/Replica Node Switchover
- Querying Whether Specifications of an Instance Can Be Increased
- Obtaining Shard Bandwidth of an Instance
- Modifying Instance Shard Bandwidth
- Asynchronously Exporting Instances
- Starting or Stopping a Specified Instance Node
- Obtaining the Instance Engine Version by Instance ID
- Upgrading the Minor Version of an Instance
- Shards and Replicas
- Parameter Management
- Backup and Restoration
-
Data Migration
- Switching IP
- Creating a Backup Import Task
- Listing Migration Tasks
- Deleting Data Migration Tasks
- Querying Details of a Data Migration Task
- Configuring Auto-Reconnect for Migration Tasks
- Stopping a Data Migration Task
- Querying the Progress of an Online Migration Task
- Creating an Online Data Migration Task
- Configuring an Online Data Migration Task
- Stopping Data Migration Tasks
- Stopping Synchronization of a Data Migration Task
- Querying the Migration Log List
- Restarting Online Migration Tasks in Batches
- Tag Management
-
Cache Analysis
- Querying Expired Key Scan Records
- Scanning for Expired Keys Immediately
- Creating a Big Key Analysis Task
- Listing Big Key Analysis Tasks
- Querying Big Key Analysis Details
- Deleting a Big Key Analysis Task
- Configuring Automatic Big Key Analysis
- Querying the Configurations of Automatic Big Key Analysis
- Creating a Hot Key Analysis Task
- Listing Hot Key Analysis Tasks
- Querying Hot Key Analysis Details
- Deleting a Hot Key Analysis Task
- Configuring Automatic Hot Key Analysis
- Querying the Configurations of Automatic Hot Key Analysis
- Creating an Expired Key Scan Task
- Querying Automatic Scanning Configuration
- Modifying Automatic Scanning Configuration
- Log Management
- Account Management
- Network Security
- Background Task Management
- Instance Diagnosis
- Template Management
- Other APIs
- Session Management
- Permissions Policies and Supported Actions
- Appendix
- Out-of-Date APIs (Unavailable Soon)
- SDK Reference
-
FAQs
- Instance Types/Versions
-
Feature
- What Are the CPU Specifications of DCS Instances?
- What Are Shard and Replica Quantities?
- Do DCS Redis Instances Limit the Size of a Key or Value?
- Can I Obtain the Addresses of the Nodes in a Cluster DCS Redis Instance?
- Does DCS for Redis Support Redis Clusters?
- What Are Redis Data Eviction Policies?
- Does DCS for Redis Support Read/Write Splitting?
- Does DCS for Redis Support Multi-DB?
- Does DCS Support External Extensions, Plug-ins, or Modules?
- Do DCS Redis Instances Support Data Persistence? What Is the Impact of Persistence?
- Do DCS Redis Instances Limite Data Quantity?
-
Security
- How Do I Configure a Security Group?
- Why Can't Security Groups Be Configured for DCS Redis 4.0/5.0/6.0 Basic Edition Instances?
- How Can I Secure My DCS Redis Instances?
- Does DCS for Redis Support SSL Encrypted Transmission?
- How Do I Enable or Disable SSL for Public Access to a DCS Redis 3.0 Instance?
- Does DCS Support Cross-AZ Deployment?
- Is a Password Required for Accessing an Instance? How Do I Set a Password?
- Sentinel Principle
- Does DCS Support Sentinels?
-
Client and Network Connection
- Does DCS Support Public Access?
- Troubleshooting Redis Connection Failures
- Does DCS Support Cross-VPC Access?
- Will I Be Charged for the EIP Used for Public Access to a DCS Redis Instance?
- Why Is "(error) NOAUTH Authentication required" Displayed When I Access a DCS Redis Instance?
- What Should I Do If Access to DCS Fails After Server Disconnects?
- Why Do Requests Sometimes Time Out in Clients?
- What Should I Do If an Error Is Returned When I Use the Jedis Connection Pool?
- How Do I Access a DCS Redis Instance Through Redis Desktop Manager?
- What If "ERR Unsupported CONFIG subcommand" is Displayed in SpringCloud?
- What Can I Do If I Fail to Access a DCS Instance Using Its Domain Name Address?
- Can I Access DCS Instances in a Local Environment?
- What Should Be Noted When Using Redis for Pub/Sub?
- Why Is Public Access of My DCS Redis 3.0 Instance Unintentionally Disabled?
- What Can I Do If Error "Cannot assign requested address" Is Returned When I Access Redis Using connect?
- Connection Pool Selection and Recommended Jedis Parameter Settings
- What Can I Do If a Lettuce 6.x Client Is Incompatible with My DCS Instance?
- Should I Use a Domain Name or an IP Address to Connect to a DCS Redis Instance?
- Is the Read-only Address of a Master/Standby Instance Connected to the Master or Standby Node?
-
Redis Usage
- Can I Change the CPU Architecture?
- Can I Change the AZ for an Instance?
- Can I Change the VPC and Subnet for a DCS Redis Instance?
- Can I Customize or Change the Port for Accessing a DCS Instance?
- Can I Modify the Connection Addresses for Accessing a DCS Instance?
- Why Do I Fail to Delete an Instance?
- Why Does It Take a Long Time to Start a Cluster DCS Instance?
- What Should I Do If an Error Occurs in redis_exporter?
- What Is Reserved Memory? How Do I Configure Reserved Memory?
- Why Is Available Memory Smaller Than Instance Cache Size?
- Why Is Redisson Distributed Lock Not Supported by DCS Proxy Cluster Redis 3.0 Instances?
- Does DCS for Redis Provide Backend Management Software?
- Can I Recover Deleted Data of a DCS Instance?
- Why Is Available Memory of Unused DCS Instances Less Than Total Memory and Why Is Memory Usage of Unused DCS Instances Greater Than Zero?
- How Do I Check Redis Memory Usage?
- Why Is the Capacity or Performance of a Shard of a Redis Cluster Instance Overloaded When That of the Instance Is Still Below the Bottleneck?
- Why Does an OOM Error Occur During a Redis Connection?
- What Clients Can I Use for Redis Cluster in Different Programming Languages?
- Why Do I Need to Configure Timeout for Redis Cluster?
- Why Am I Seeing a Timeout Error When Reading Data from Redis?
- Explaining and Using Hash Tags
- Why Does a Key Disappear in Redis?
- Will Cached Data Be Retained After an Instance Is Restarted?
- How Do I Know Whether an Instance Is Single-DB or Multi-DB?
- Notes and Procedure for Enabling Multi-DB for Proxy Cluster Instances
- How Do I Create a Multi-DB Proxy Cluster Instance?
-
Instance Scaling and Upgrade
- Can I Upgrade Version for a DCS Redis Instance, for Example, from Redis 4.0 to Redis 5.0?
- Upgrading a Redis 3.0 Instance
- Are Services Interrupted If Maintenance is Performed During the Maintenance Time Window?
- Are DCS Instances Stopped or Restarted During Specification Modification?
- What DCS Instance Type Changes Are Supported?
- Are Services Interrupted During Specification Modification?
- Why Do I Fail to Modify the Specifications for a DCS Instance?
- How Do I Reduce the Capacity of a DCS Instance?
- How Do I Add Shards to a Cluster DCS Redis Instance Without Changing the Memory?
- How Do I Handle an Error When I Use Lettuce to Connect to a Redis Cluster Instance After Specification Modification?
- Can I Expand a Single Shard of a Cluster Instance (Scale-Up)?
-
Data Backup, Export, and Migration
- Can I Migrate Data from a Lower Redis Version to a Higher One?
- What Should I Consider When Transferring or Operating Data Between Different OSs?
- Can I Migrate Data from a Multi-DB Source Redis Instance to a Cluster DCS Redis Instance?
- What Are the Constraints and Precautions for Migrating Redis Data to a Cluster Instance?
- What Should I Consider for Online Migration?
- Can I Perform Online Migration Without Any Service Interruption?
- What If "Disconnecting timedout slave" and "overcoming of output buffer limits" Are Reported on the Source Instance During Online Migration?
- How Do I Export DCS Redis Instance Data?
- Why Is Memory of a DCS Redis Instance Unchanged After Data Migration Using Rump, Even If No Error Message Is Returned?
- Can I Export Backup Data of DCS Redis Instances to RDB Files on the Console?
- Where Are DCS Instance Backup Files Stored? How Many of Them Can Be Stored?
- Is All Data in a DCS Redis Instance Migrated During Online Migration?
- When Will AOF Rewrites Be Triggered?
- What Are the Common Causes of Redis Migration Failures?
- Can I Migrate Data to Multiple Target Instances in One Migration Task?
- How Do I Enable the SYNC and PSYNC Commands?
- Will the Same Keys Be Overwritten During Data Migration or Backup Import?
- Why Does Redis Cluster Migration Fail If It Uses Built-in Keys and Cross-Slot Lua Scripts?
- Handling Migration Errors
- Troubleshooting Data Migration Failures
- How Do I Migrate Memcached Data?
- Can I Migrate Data Between DCS Memcached and Redis Instances?
-
Big/Hot Key Analysis and Expired Key Scan
- What Are Big Keys and Hot Keys?
- What Is the Impact of Big Keys or Hot Keys?
- How Do I Avoid Big Keys and Hot Keys?
- How Do I Analyze the Hot Keys of a DCS Redis 3.0 Instance?
- How Do I Detect Big Keys and Hot Keys in Advance?
- How Does DCS Delete Expired Keys?
- How Long Are Keys Stored? How Do I Set Key Expiration?
- Why Does Memory Usage Decrease After Big Key Analysis Is Performed on Redis?
-
Redis Commands
- Does DCS for Redis Support Command Audits?
- How Do I Clear Redis Data?
- How Do I Find Specified Keys and Traverse All Keys?
- Why Do I Fail to Execute Some Redis Commands?
- Why is "permission denied" Returned When I Run the KEYS Command in Web CLI?
- How Do I Rename High-Risk Commands?
- Does DCS for Redis Support Pipelining?
- Does DCS for Redis Support the INCR and EXPIRE Commands?
- Why Does a Redis Command Fail to Take Effect?
- Is There a Time Limit on Executing Redis Commands? What Will Happen If a Command Times Out?
- Can I Configure Redis Keys to Be Case-Insensitive?
- Common Web CLI Errors
-
Monitoring and Alarm
- Why Is CPU Usage of a DCS Redis Instance 100%?
- How Do I View Current Concurrent Connections and Maximum Connections of a DCS Redis Instance?
- What Should I Do If the Monitoring Data of a DCS Redis Instance Is Abnormal?
- Why Is Used Memory Greater Than Available Memory?
- Why Does Bandwidth Usage Exceed 100%?
- Why Is the Rejected Connections Metric Displayed?
- Why Is Flow Control Triggered? How Do I Handle It?
- Master/Standby Switchover
- Instance Creation and Permissions
-
Memcached Usage
- Can I Dump DCS Memcached Instance Data for Analysis?
- What Memcached Version Is Compatible with DCS for Memcached?
- What Data Structures Does DCS for Memcached Support?
- Does DCS for Memcached Support Public Access?
- Can I Modify Configuration Parameters of DCS Memcached Instances?
- What Are the Differences Between DCS for Memcached and Self-Hosted Memcached?
- What Policies Does DCS for Memcached Use to Deal with Expired Data?
- How Should I Select AZs When Creating a DCS Memcached Instance?
- Troubleshooting
- Videos
-
More Documents
-
User Guide (ME-Abu Dhabi Region)
- Service Overview
- Getting Started
- Operation Guide
- Monitoring
- Auditing
-
FAQs
-
Client and Network Connection
- Security Group Configurations
- Does DCS Support Public Access?
- Does DCS Support Cross-VPC Access?
- What Should I Do If Access to DCS Fails After Server Disconnects?
- Why Do Requests Sometimes Time Out in Clients?
- What Should I Do If an Error Is Returned When I Use the Jedis Connection Pool?
- Why Is "ERR unknown command" Displayed When I Access a DCS Redis Instance Through a Redis Client?
- How Do I Access a DCS Redis Instance Through Redis Desktop Manager?
- What If "ERR Unsupported CONFIG subcommand" is Displayed in SpringCloud?
- How Do I Troubleshoot Redis Connection Failures?
- What Should Be Noted When Using Redis for Pub/Sub?
-
Redis Usage
- Why Is CPU Usage of a DCS Redis Instance 100%?
- Can I Change the VPC and Subnet for a DCS Redis Instance?
- Why Aren't Security Groups Configured for DCS Redis 4.0 and 5.0 Instances?
- Do DCS Redis Instances Limit the Size of a Key or Value?
- Can I Obtain the Addresses of the Nodes in a Cluster DCS Redis Instance?
- Why Is Available Memory of a DCS Redis 3.0 Instance Smaller Than Instance Cache Size?
- Does DCS for Redis Support Multiple Databases?
- Does DCS for Redis Support Redis Clusters?
- Does DCS for Redis Support Sentinel?
- What Is the Default Data Eviction Policy?
- What Should I Do If an Error Occurs in Redis Exporter?
- Why Is Memory Usage More Than 100%?
- Why Is Redisson Distributed Lock Not Supported by DCS Proxy Cluster Redis 3.0 Instances?
- Can I Customize or Change the Port for Accessing a DCS Instance?
- Can I Modify the Connection Addresses for Accessing a DCS Instance?
- Does DCS Support Cross-AZ Deployment?
- Why Does It Take a Long Time to Start a Cluster DCS Instance?
- What If Redis Commands Are Incompatible with DCS for Redis?
- Does DCS for Redis Provide Backend Management Software?
- Why Is Memory of a DCS Redis Instance Used Up by Just a Few Keys?
- Can I Recover Data from Deleted DCS Instances?
-
Redis Commands
- How Do I Clear Redis Data?
- How Do I Rename High-Risk Commands?
- Does DCS for Redis Support Pipelining?
- Does DCS for Redis Support the INCR and EXPIRE Commands?
- Why Do I Fail to Execute Some Redis Commands?
- Why Does a Redis Command Fail to Take Effect?
- Is There a Time Limit on Executing Redis Commands? What Will Happen If a Command Times Out?
-
Instance Scaling and Upgrade
- Can DCS Redis Instances Be Upgraded, for Example, from Redis 3.0 to Redis 4.0 or 5.0?
- Are Services Interrupted If Maintenance is Performed During the Maintenance Time Window?
- Are Instance Resources Affected During Specification Modification?
- Are Services Interrupted During Specification Modification?
- Why Do I Fail to Modify the Specifications for a DCS Redis Instance?
- Monitoring and Alarm
- Data Backup, Export, and Migration
- Master/Standby Switchover
-
Client and Network Connection
- Change History
- API Reference (ME-Abu Dhabi Region)
-
User Guide (Paris Region)
- Service Overview
- Getting Started
- Operation Guide
- Monitoring
- Auditing
-
FAQs
-
Client and Network Connection
- Security Group Configurations
- Does DCS Support Public Access?
- Does DCS Support Cross-VPC Access?
- What Should I Do If Access to DCS Fails After Server Disconnects?
- Why Do Requests Sometimes Time Out in Clients?
- What Should I Do If an Error Is Returned When I Use the Jedis Connection Pool?
- Why Is "ERR unknown command" Displayed When I Access a DCS Redis Instance Through a Redis Client?
- How Do I Access a DCS Redis Instance Through Redis Desktop Manager?
- What If "ERR Unsupported CONFIG subcommand" is Displayed in SpringCloud?
- How Do I Troubleshoot Redis Connection Failures?
- What Should Be Noted When Using Redis for Pub/Sub?
-
Redis Usage
- Why Is CPU Usage of a DCS Redis Instance 100%?
- Can I Change the VPC and Subnet for a DCS Redis Instance?
- Do DCS Redis Instances Limit the Size of a Key or Value?
- Why Is Available Memory of a DCS Redis 3.0 Instance Smaller Than Instance Cache Size?
- Does DCS for Redis Support Multiple Databases?
- Does DCS for Redis Support Redis Clusters?
- Does DCS for Redis Support Sentinel?
- What Is the Default Data Eviction Policy?
- What Should I Do If an Error Occurs in Redis Exporter?
- Why Is Memory Usage More Than 100%?
- Why Is Redisson Distributed Lock Not Supported by DCS Proxy Cluster Redis 3.0 Instances?
- Can I Customize or Change the Port for Accessing a DCS Instance?
- Can I Modify the Connection Addresses for Accessing a DCS Instance?
- Does DCS Support Cross-AZ Deployment?
- Why Does It Take a Long Time to Start a Cluster DCS Instance?
- Why Is Memory of a DCS Redis Instance Used Up by Just a Few Keys?
- Can I Recover Data from Deleted DCS Instances?
- Why Is "Error in execution" Returned When I Access Redis?
-
Redis Commands
- Why is "permission denied" Returned When I Run the Keys Command in Web CLI?
- How Do I Clear Redis Data?
- Does DCS for Redis Support the INCR and EXPIRE Commands?
- Why Do I Fail to Execute Some Redis Commands?
- Why Does a Redis Command Fail to Take Effect?
- Is There a Time Limit on Executing Redis Commands? What Will Happen If a Command Times Out?
-
Instance Scaling and Upgrade
- Can DCS Redis Instances Be Upgraded, for Example, from Redis 3.0 to Redis 4.0 or 5.0?
- Are Services Interrupted If Maintenance is Performed During the Maintenance Time Window?
- Are Instance Resources Affected During Specification Modification?
- Are Services Interrupted During Specification Modification?
- Why Do I Fail to Modify the Specifications for a DCS Redis or Memcached Instance?
- Data Backup, Export, and Migration
- Master/Standby Switchover
-
Memcached Usage
- Can I Dump DCS Memcached Instance Data for Analysis?
- What Memcached Version Is Compatible with DCS for Memcached?
- What Data Structures Does DCS for Memcached Support?
- Does DCS for Memcached Support Public Access?
- Can I Modify Configuration Parameters of DCS Memcached Instances?
- What Are the Differences Between DCS for Memcached and Self-Hosted Memcached?
- What Policies Does DCS for Memcached Use to Deal with Expired Data?
- How Should I Select AZs When Creating a DCS Memcached Instance?
-
Client and Network Connection
- Change History
-
API Reference (Paris Region)
- Before You Start
- API Overview
- Calling APIs
-
API V2
- Lifecycle Management
- Instance Management
- Shards and Replicas
- Parameter Management
- Backup and Restoration
-
Data Migration
- Creating a Backup Import Task
- Listing Migration Tasks
- Deleting Data Migration Tasks
- Querying Details of a Data Migration Task
- Configuring Auto-Reconnect for Migration Tasks
- Stopping a Data Migration Task
- Querying the Progress of an Online Migration Task
- Creating an Online Data Migration Task
- Configuring an Online Data Migration Task
- Stopping Data Migration Tasks
- Stopping Synchronization of a Data Migration Task
-
Cache Analysis
- Creating a Big Key Analysis Task
- Listing Big Key Analysis Tasks
- Querying Big Key Analysis Details
- Deleting a Big Key Analysis Task
- Configuring Automatic Big Key Analysis
- Querying the Configurations of Automatic Big Key Analysis
- Creating a Hot Key Analysis Task
- Listing Hot Key Analysis Tasks
- Querying Hot Key Analysis Details
- Deleting a Hot Key Analysis Task
- Configuring Automatic Hot Key Analysis
- Querying the Configurations of Automatic Hot Key Analysis
- Log Management
- Network Security
- Background Task Management
- Instance Diagnosis
- Template Management
- Other APIs
- Outdated APIs (V1)
- Permissions Policies and Supported Actions
- Appendix
- Change History
-
User Guide (Kuala Lumpur Region)
-
Service Overview
- What Is DCS?
- Application Scenarios
- DCS Instance Types
- DCS Instance Specifications
- Command Compatibility
- Disaster Recovery and Multi-Active Solution
- Comparing Redis Versions
- Comparing Redis and Memcached
- Comparing DCS and Open-Source Cache Services
- Notes and Constraints
- Basic Concepts
- Permissions
- Related Services
- Permissions Management
- Process of Using DCS
-
Getting Started
- Creating an Instance
-
Accessing an Instance
- Network Conditions for Accessing DCS Redis
- Accessing a DCS Redis Instance Through redis-cli
- Access in Different Languages
- Accessing a DCS Redis 4.0/5.0/6.0 Instance on the Console
- Accessing a DCS Memcached Instance (Discontinued)
- Viewing Details of a DCS Instance
- Operating DCS Instances
-
Managing DCS Instances
- Configuration Notice
- Modifying Configuration Parameters
- Modifying the Security Group
- Viewing Background Tasks
- Viewing Data Storage Statistics of a DCS Redis 3.0 Proxy Cluster Instance
- Managing Tags
- Managing Shards and Replicas
- Analyzing Big Keys and Hot Keys
- Managing IP Address Whitelist
- Viewing Redis Slow Queries
- Viewing Redis Run Logs
- Diagnosing an Instance
- Transmitting DCS Redis Data with Encryption Using SSL
- Backing Up and Restoring DCS Instances
- Migrating Data with DCS
- Managing Passwords
- Parameter Templates
- Monitoring
- Auditing
- Data Migration Guide
-
FAQs
- Instance Types/Versions
-
Client and Network Connection
- Security Group Configurations
- Does DCS Support Access over Public Networks?
- Does DCS Support Cross-VPC Access?
- Why Is "(error) NOAUTH Authentication required" Displayed When I Access a DCS Redis Instance?
- What Should I Do If Access to DCS Fails After Server Disconnects?
- Why Do Requests Sometimes Time Out in Clients?
- What Should I Do If an Error Is Returned When I Use the Jedis Connection Pool?
- Why Is "ERR unknown command" Displayed When I Access a DCS Redis Instance Through a Redis Client?
- How Do I Access a DCS Redis Instance Through Redis Desktop Manager?
- What If "ERR Unsupported CONFIG subcommand" is Displayed in SpringCloud?
- Is a Password Required for Accessing an Instance? How Do I Set a Password?
- What Should Be Noted When Using Redis for Pub/Sub?
- How Do I Troubleshoot Redis Connection Failures?
- What Can I Do If Error "Cannot assign requested address" Is Returned When I Access Redis Using connect?
- Connection Pool Selection and Recommended Jedis Parameter Settings
-
Redis Usage
- What Are Shard and Replica Quantities?
- Why Is CPU Usage of a DCS Redis Instance 100%?
- Can I Change the VPC and Subnet for a DCS Redis Instance?
- Why Aren't Security Groups Configured for DCS Redis 4.0/5.0/6.0 Instances?
- Do DCS Redis Instances Limit the Size of a Key or Value?
- Can I Obtain the Addresses of the Nodes in a Cluster DCS Redis Instance?
- Why Is Available Memory Smaller Than Instance Cache Size?
- Does DCS for Redis Support Read/Write Splitting?How Do I Configure Read/Write Splitting for a Redis Cluster Instance?
- Does DCS for Redis Support Multiple Databases?
- Does DCS for Redis Support Redis Clusters?
- What Is Sentinel?
- Does DCS for Redis Support Sentinel?
- What Is the Default Data Eviction Policy?
- What Should I Do If an Error Occurs in Redis Exporter?
- How Can I Secure My DCS Redis Instances?
- Why Is Redisson Distributed Lock Not Supported by DCS Proxy Cluster Redis 3.0 Instances?
- Can I Customize or Change the Port for Accessing a DCS Instance?
- Can I Modify the Connection Addresses for Accessing a DCS Instance?
- Why Do I Fail to Delete an Instance?
- Does DCS Support Cross-AZ Deployment?
- Why Does It Take a Long Time to Start a Cluster DCS Instance?
- Does DCS for Redis Provide Backend Management Software?
- Can I Recover Data from Deleted DCS Instances?
- Does DCS for Redis Support SSL Encrypted Transmission?
- Why Is Available Memory of Unused DCS Instances Less Than Total Memory and Why Is Memory Usage of Unused DCS Instances Greater Than Zero?
- How Do I Check Redis Memory Usage?
- Why Is the Capacity or Performance of a Shard of a Redis Cluster Instance Overloaded When That of the Instance Is Still Below the Bottleneck?
- Does DCS Support External Extensions, Plug-ins, or Modules?
- Why Is "Error in execution" Returned When I Access Redis?
- Why Does a Key Disappear in Redis?
- Why Does an OOM Error Occur During a Redis Connection?
- What Clients Can I Use for Redis Cluster in Different Programming Languages?
- Why Do I Need to Configure Timeout for Redis Cluster?
- Can I Change the AZ for an Instance?
- Explaining and Using Hash Tags
- Will Cached Data Be Retained After an Instance Is Restarted?
-
Redis Commands
- How Do I Clear Redis Data?
- How Do I Find Specified Keys and Traverse All Keys?
- Why is "permission denied" Returned When I Run the KEYS Command in Web CLI?
- How Do I Disable High-Risk Commands?
- Does DCS for Redis Support Pipelining?
- Does DCS for Redis Support the INCR and EXPIRE Commands?
- Why Do I Fail to Execute Some Redis Commands?
- Why Does a Redis Command Fail to Take Effect?
- Is There a Time Limit on Executing Redis Commands? What Will Happen If a Command Times Out?
- Can I Configure Redis Keys to Be Case-Insensitive?
- Can I View the Most Frequently Used Redis Commands?
- Common Web CLI Errors
-
Instance Scaling and Upgrade
- Can DCS Redis Instances Be Upgraded, for Example, from Redis 4.0 to 5.0?
- Are Services Interrupted If Maintenance is Performed During the Maintenance Time Window?
- Are Instances Stopped or Restarted During Specification Modification?
- Are Services Interrupted During Specification Modification?
- Why Can't I Modify Specifications for a DCS Redis/Memcached Instance?
- How Do I Reduce the Capacity of a DCS Instance?
- How Do I Handle an Error When I Use Lettuce to Connect to a Redis Cluster Instance After Specification Modification?
-
Monitoring and Alarm
- How Do I View Current Concurrent Connections and Maximum Connections of a DCS Redis Instance?
- Does Redis Support Command Audits?
- What Should I Do If the Monitoring Data of a DCS Redis Instance Is Abnormal?
- Why Is Available Memory of Unused DCS Instances Less Than Total Memory and Why Is Memory Usage of Unused DCS Instances Greater Than Zero?
- Why Is Used Memory Greater Than Available Memory?
- Why Does Bandwidth Usage Exceed 100%?
- Why Is the Rejected Connections Metric Displayed?
- Why Is Flow Control Triggered? How Do I Handle It?
-
Data Backup, Export, and Migration
- How Do I Export DCS Redis Instance Data?
- Can I Export Backup Data of DCS Redis Instances to RDB Files Using the Console?
- Why Are Processes Frequently Killed During Data Migration?
- Is All Data in a DCS Redis Instance Migrated During Online Migration?
- Do DCS Redis Instances Support Data Persistence? What Is the Impact of Persistence?
- When Will AOF Rewrites Be Triggered?
- Can I Migrate Data to Multiple Target Instances in One Migration Task?
- How Do I Enable the SYNC and PSYNC Commands?
- Will the Same Keys Be Overwritten During Data Migration or Backup Import?
- Online Migration with Rump
- What Should I Consider When Transferring or Operating Data Between Different OSs?
- Can I Migrate Data from a Multi-DB Source Redis Instance to a Cluster DCS Redis Instance?
- How Can I Migrate Partial Data?
- What Are the Constraints and Precautions for Migrating Redis Data to a Cluster Instance?
- What Should I Consider for Online Migration?
- Can I Perform Online Migration Without Any Service Interruption?
- What If "Disconnecting timedout slave" and "overcoming of output buffer limits" Are Reported on the Source Instance During Online Migration?
- Why Is Memory of a DCS Redis Instance Unchanged After Data Migration Using Rump, Even If No Error Message Is Returned?
- Can I Migrate Data from a Lower Redis Version to a Higher One?
- How Do I Migrate Memcached Data?
- Big/Hot Key Analysis
- Master/Standby Switchover
-
Memcached Usage
- Can I Dump DCS Memcached Instance Data for Analysis?
- What Memcached Version Is Compatible with DCS for Memcached?
- What Data Structures Does DCS for Memcached Support?
- Does DCS for Memcached Support Public Access?
- Can I Modify Configuration Parameters of DCS Memcached Instances?
- What Are the Differences Between DCS for Memcached and Self-Hosted Memcached?
- What Policies Does DCS for Memcached Use to Deal with Expired Data?
- How Should I Select AZs When Creating a DCS Memcached Instance?
- Troubleshooting
- Change History
-
Service Overview
- API Reference (Kuala Lumpur Region)
-
API Reference (Ankara Region)
- Before You Start
- API Overview
- Calling APIs
-
APIs V2 (Recommended)
- Lifecycle Management
- Instance Management
- Shards and Replicas
- Parameter Management
- Backup and Restoration
-
Data Migration
- Creating a Backup Import Task
- Listing Migration Tasks
- Deleting Data Migration Tasks
- Querying Details of a Data Migration Task
- Stopping a Data Migration Task
- Querying the Progress of an Online Migration Task
- Creating an Online Data Migration Task
- Configuring an Online Data Migration Task
- Stopping Data Migration Tasks
- Log Management
- Background Task Management
- Other APIs
- Outdated APIs (V1)
- Permissions Policies and Supported Actions
- Appendix
-
User Guide (Ankara Region)
- Service Overview
-
Getting Started
- Creating an Instance
-
Accessing an Instance
- Network Conditions for Accessing DCS Redis
- Accessing a DCS Redis Instance Through redis-cli
- Access in Different Languages
- Accessing a DCS Redis Instance on the Console
- Viewing Details of a DCS Instance
-
User Guide
- Permissions Management
- Operating DCS Instances
-
Managing DCS Instances
- Configuration Notice
- Modifying Configuration Parameters
- Modifying Maintenance Time Window
- Modifying the Security Group
- Viewing Background Tasks
- Viewing Data Storage Statistics of a DCS Redis 3.0 Proxy Cluster Instance
- Managing Shards and Replicas
- Analyzing Big Keys and Hot Keys
- Scanning and Deleting Expired Keys in a DCS Redis Instance
- Managing IP Address Whitelist
- Viewing Redis Run Logs
- Diagnosing an Instance
- Backing Up and Restoring DCS Instances
- Migrating Data with DCS
- Managing Passwords
- Monitoring
- Best Practices
-
FAQs
- Instance Types/Versions
-
Client and Network Connection
- Security Group Configurations
- Does DCS Support Access at EIPs?
- Does DCS Support Cross-VPC Access?
- What Should I Do If Access to DCS Fails After Server Disconnects?
- Why Do Requests Sometimes Time Out in Clients?
- What Should I Do If an Error Is Returned When I Use the Jedis Connection Pool?
- Why Is "ERR unknown command" Displayed When I Access a DCS Redis Instance Through a Redis Client?
- How Do I Access a DCS Redis Instance Through Redis Desktop Manager?
- What If "ERR Unsupported CONFIG subcommand" is Displayed in SpringCloud?
- How Do I Troubleshoot Redis Connection Failures?
- What Should Be Noted When Using Redis for Pub/Sub?
- Should I Use a Domain Name or an IP Address to Connect to a DCS Redis Instance?
-
Redis Usage
- Why Is CPU Usage of a DCS Redis Instance 100%?
- Can I Change the VPC and Subnet for a DCS Redis Instance?
- Why Aren't Security Groups Configured for DCS Redis 4.0 and Later Instances?
- Do DCS Redis Instances Limit the Size of a Key or Value?
- Can I Obtain the Addresses of the Nodes in a Cluster DCS Redis Instance?
- Why Is Available Memory Smaller Than Instance Cache Size?
- Does DCS for Redis Support Multiple Databases?
- Does DCS for Redis Support Redis Clusters?
- Does DCS for Redis Support Sentinel?
- What Is the Default Data Eviction Policy?
- What Should I Do If an Error Occurs in Redis Exporter?
- Why Is Redisson Distributed Lock Not Supported by DCS Proxy Cluster Redis 3.0 Instances?
- Can I Customize or Change the Port for Accessing a DCS Instance?
- Can I Modify the Connection Addresses for Accessing a DCS Instance?
- Does DCS Support Cross-AZ Deployment?
- Why Does It Take a Long Time to Start a Cluster DCS Instance?
- What If Redis Commands Are Incompatible with DCS for Redis?
- Does DCS for Redis Provide Backend Management Software?
- Why Is Memory of a DCS Redis Instance Used Up by Just a Few Keys?
- Can I Recover Data from Deleted DCS Instances?
- Why Is "Error in execution" Returned When I Access Redis?
-
Redis Commands
- How Do I Clear Redis Data?
- How Do I Disable High-Risk Commands?
- Does DCS for Redis Support Pipelining?
- Does DCS for Redis Support the INCR and EXPIRE Commands?
- Why Do I Fail to Execute Some Redis Commands?
- Why Does a Redis Command Fail to Take Effect?
- Is There a Time Limit on Executing Redis Commands? What Will Happen If a Command Times Out?
-
Instance Scaling and Upgrade
- Can DCS Redis Instances Be Upgraded, for Example, from Redis 4.0 to 5.0?
- Are Services Interrupted If Maintenance is Performed During the Maintenance Time Window?
- Are Instances Stopped or Restarted During Specification Modification?
- Are Services Interrupted During Specification Modification?
- Why Can't I Modify Specifications for a DCS Redis Instance?
-
Monitoring and Alarm
- Does Redis Support Command Audits?
- What Should I Do If the Monitoring Data of a DCS Redis Instance Is Abnormal?
- Why Is Available Memory of Unused DCS Instances Less Than Total Memory and Why Is Memory Usage of Unused DCS Instances Greater Than Zero?
- Why Is Used Memory Greater Than Available Memory?
- Why Is Flow Control Triggered? How Do I Handle It?
-
Data Backup, Export, and Migration
- How Do I Export DCS Redis Instance Data?
- Can I Export Backup Data of DCS Redis Instances to RDB Files Using the Console?
- Why Are Processes Frequently Killed During Data Migration?
- Is All Data in a DCS Redis Instance Migrated During Online Migration?
- Do DCS Redis Instances Support Data Persistence? What Is the Impact of Persistence?
- When Will AOF Rewrites Be Triggered?
- Online Migration with Rump
-
Big/Hot Key Analysis and Expired Key Scan
- What Are Big Keys and Hot Keys?
- What Is the Impact of Big Keys or Hot Keys?
- How Do I Avoid Big Keys and Hot Keys?
- How Do I Analyze the Hot Keys of a DCS Redis 3.0 Instance?
- How Do I Detect Big Keys and Hot Keys in Advance?
- How Does DCS Delete Expired Keys?
- How Long Are Keys Stored? How Do I Set Key Expiration?
- Master/Standby Switchover
-
User Guide (ME-Abu Dhabi Region)
- General Reference
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Data Migration
- Creating a Backup Import Task
- Listing Migration Tasks
- Deleting Data Migration Tasks
- Querying Details of a Data Migration Task
- Configuring Auto-Reconnect for Migration Tasks
- Stopping a Data Migration Task
- Querying the Progress of an Online Migration Task
- Creating an Online Data Migration Task
- Configuring an Online Data Migration Task
- Stopping Data Migration Tasks
- Stopping Synchronization of a Data Migration Task
Parent topic: API V2
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