- 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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Buying a DCS Redis Instance
You can buy one or more DCS Redis instances with the required computing capabilities and storage space based on service requirements.
- DCS for Redis 3.0 can no longer be purchased. This section describes how to create a DCS Redis 4.0 or later instance.
- Currently, DCS for Redis 6.0 is available only in some regions, such as CN North-Beijing4 and CN South-Guangzhou.
- The supported Redis versions and instance types vary across regions.
Preparing Required Resources
DCS Redis instances are deployed in Virtual Private Clouds (VPCs), and bound to specific subnets. In this way, Redis instances are isolated with virtual networks that users can manage by themselves. To use professional edition Redis, security groups are required.
Therefore, before creating a Redis instance, prepare a VPC, security group, and subnet if you do not have one yet.
Only professional edition DCS Redis instances require security groups.
Resource |
Requirement |
Operations |
---|---|---|
VPC and subnet |
Different Redis instances can use the same or different VPCs and subnets as required. Note the following when creating a VPC and subnet:
|
For details on how to create a VPC and subnet, see Creating a VPC. If you need to create and use a new subnet in an existing VPC, see Creating a Subnet for the VPC. |
Security group |
Different Redis instances can use the same security group or different security groups. Note the following when creating a security group:
|
For details on how to create a security group, see Creating a Security Group. For details on how to add rules to a security group, see Adding a Security Group Rule. |
Buying a DCS Redis Instance
- Go to the Buy DCS Instance page.
- Choose a purchase mode. Quick Config and Custom are available.
In Quick Config, several common Specification Settings are available, as shown in Figure 1. If none of them meet your needs, go to the Custom tab page to customize instance types and specifications, as shown in Figure 2.
NOTE:
Quick Config and Custom differ only in specification selection.
- Specify Billing Mode.
- Select a region closest to your application to reduce latency and accelerate access.
- Select a project. By default, each region corresponds to a project.
- Configure specifications. If you choose Quick Config, select one of the common specifications by referring to Table 3. If you choose Custom, configure instance specifications by referring to Table 4.
Table 3 Specifications (Quick Config) Item
Description
Basic - memory/Professional - memory
Basic and Professional editions are available. Comparing Professional and Basic Editions
For example, Basic - 16GB is a basic edition instance with 16 GB memory.
Version
Version of the Redis instance. For details, see Comparing Redis Versions.
NOTE:
The Redis version cannot be changed once the instance is created. To use a later Redis version, create another DCS Redis instance and then migrate data from the old instance to the new one.
Instance Type
Master/Standby, Redis Cluster, and Proxy Cluster instances can be quickly configured. For details, see DCS Instance Types.
CPU Architecture
x86-based CPU can be quickly configured.
Replicas
Two replicas mean that the instance has two nodes (one master and one standby).
AZ
AZs where the master node and standby node of the instance are located.
Table 4 Specifications (Custom) Item
Description
Cache Engine
Only Redis is available.
Edition
Basic and Professional editions are available. Comparing Professional and Basic Editions
Basic and Professional are available only when 6.0 is selected. Other versions support only Basic.
Sub-edition
Performance and Storage are available for the professional edition.
Sub-edition is required only when Professional is selected.
CPU Architecture
x86 and Arm are available.
x86 is recommended. Arm is unavailable in some regions.
Version
Currently supported Redis versions: 4.0, 5.0, and 6.0. For details, see Comparing Redis Versions.
NOTE:
The Redis version cannot be changed once the instance is created. To use a later Redis version, create another DCS Redis instance and then migrate data from the old instance to the new one.
Instance Type
Single-node, master/standby, Proxy Cluster, Redis Cluster, and read/write splitting types are supported. For more information, see DCS Instance Types.
The master/standby type is available in the Redis 6.0 enterprise edition.
AZ
AZ: If Instance Type is master/standby, read/write splitting, Proxy Cluster, or Redis Cluster, AZ and Standby AZ are displayed. In this case, select AZs for the master and standby nodes of the instance.
Each region consists of multiple AZs with physically isolated power supplies and networks. The master and standby nodes of a master/standby, read/write splitting, or cluster DCS instance can be deployed in different AZs. Applications can also be deployed across AZs to achieve high availability (HA) for both data and applications.NOTE:
- If instance nodes in an AZ are faulty, nodes in other AZs will not be affected. This is because when the master node is faulty, the standby cache node will automatically become the master node to provide services. Such deployment achieves better disaster recovery.
- Deploying a DCS instance across AZs slightly reduces network efficiency compared with deploying an instance within an AZ. Therefore, if a DCS instance is deployed across AZs, synchronization between master and standby cache nodes is slightly less efficient.
- To accelerate access, deploy your instance and your application in the same AZ.
- To purchase a DCS instance in the CN South-Guangzhou region, AZ 1–5 and 6–7 cannot be selected as the master and standby AZs for an instance. The reason is that AZ 1–5 are physically distant from AZ 6–7 which may cause high internal latency. That is, if one of AZs 1–5 is selected as the primary AZ, AZs 6–7 cannot be selected as the standby AZ. This restriction applies only in the CN South-Guangzhou region.
Replicas
Enter the number of replicas. Replicas are DCS instance nodes. One replica indicates only a master node. Two replicas indicate a master node and a standby node. Three replicas indicate a master node and two standby nodes.
Replica quantity range varies by version and instance type. Replicas cannot be set for single-node instances.
Sharding
This parameter is available only for cluster instances, and is single-choice. The shard size and quantity cannot be specified at once.
- Use default: You do not need to specify the shard size and quantity. Select one of the default instance specifications.
- Custom shard size: Select a shard size. Then select an instance specification.
- Custom shard quantity: Select a shard quantity. Then select an instance specification.
Instance Specification
In the Instance Specification area, select memory as required. For more information about the instance performance, see DCS Instance Specifications. The default memory quota is displayed on the console.
To increase quota, click Increase quota below the specifications. On the displayed page, fill in a quota application form and click Submit.
- Configure instance network settings.
- Select the created VPC and Subnet.
NOTE:
- To access the instance in an Elastic Cloud Server (ECS), select the VPC where the ECS is.
- The VPC and subnet are fixed once the DCS instance is created.
- A shared VPC implements network resource sharing, and unified and efficient management and control at low O&M costs.
- In the IPv4 Address area, set the instance (private) IP address.
Redis Cluster and professional edition instances only support automatically-assigned IP addresses. The other instance types support both automatically-assigned IP addresses and manually-specified IP addresses. You can manually specify an IP address for your instance as required.
- Configure Port. For basic edition Redis instances, you can specify a port numbering in the range from 1 to 65535. If no port is specified, the default port 6379 will be used.
For Redis 6.0 professional, you cannot customize a port. The default port 6379 will be used.
- Select the created security group from the Security Group drop-down list.
A security group is a set of rules that control access to ECSs. It provides access policies for mutually trusted ECSs with the same security protection requirements in the same VPC.
Only professional edition DCS Redis instances require security groups. Basic edition DCS Redis instances are based on VPC endpoints and do not support security groups. To control access to these instances, configure a whitelist after the instances are created.
If port 6379 is not enabled for the selected security group, the Enable port 6379 check box is displayed and selected by default, indicating that after the instance is created, port 6379 will be enabled for the selected security group. If port 6379 is not enabled for the selected security group, connections to the instance may fail.
- Select the created VPC and Subnet.
- Set Instance Name.
When you create only one instance at a time, the value of Name can contain 4 to 64 characters. When you create more than one instance at a time, the value of Name can contain 4 to 56 characters. These instances are named in the format of "name-n", in which n starts from 000 and is incremented by 1. For example, if you create two instances and set Name to dcs_demo, the two instances are respectively named as dcs_demo-000 and dcs_demo-001.
- Specify Enterprise Project. An enterprise project manages cloud resources by gathering relevant ones together.
NOTE:
If you cannot select an enterprise project, check your permissions. For details, see Why Can't I Select the Required Enterprise Project When Creating a DCS Instance?
- Set the instance password.
- Select Yes or No for Password Protected.
NOTE:
- Password-free access carries security risks. Exercise caution when selecting this mode.
- After creating a password-free DCS Redis instance, you can set a password for it later by using the password reset function. For details, see Changing Password Settings for DCS Redis Instances.
- Password and Confirm Password: These parameters indicate the password of accessing the DCS Redis instance, and are displayed only when Password Protected is set to Yes.
NOTE:
- For security purposes, if password-free access is disabled, the system prompts you to enter an instance-specific password when you are accessing the DCS Redis instance.
- Keep your instance password secure and change it periodically. The system cannot detect your password.
- Select Yes or No for Password Protected.
- Click Advanced Settings and set the following information as required.
- Configure Parameter Configuration. Retain Default templates or select Use custom template as required.
If you select Use custom template, select one from the drop-down list box. To view or modify the configuration in the selected template, click View Parameter. If no custom parameter template of the selected instance version and type is available, the selection box is empty. In this case, click View Parameter Templates to go to the template creation page to create a template. For details, see Creating a Custom Parameter Template for a DCS Instance.
- To configure instance backup policies, enable Auto Backup.
This parameter is displayed only when the instance type is master/standby, read/write splitting, or cluster. For details about instance backup and backup policies, see Backing Up and Restoring Instances.
- Currently, Public Access cannot be configured during instance creation. Configure it later on the instance details page. For details, see Enabling Public Access to Redis 4.0/5.0/6.0 and Obtaining the Access Addresses.
- Add a tag.
Tags are used to identify cloud resources. When you have many cloud resources of the same type, you can use tags to classify cloud resources by dimension (for example, by usage, owner, or environment).
If tag policies for DCS have been set in your organization, add tags to DCS instances based on these policies. If a tag does not comply with the tag policies, DCS instance creation may fail. Contact your organization administrator to learn more about tag policies.
- If you have created predefined tags, select a predefined pair of tag key and value. Click View predefined tags. On the Tag Management Service (TMS) console, view predefined tags or create new tags.
- You can also add a tag by entering the tag key and value. For details about how to name tags, see Managing Tags.
- Rename critical commands.
Currently, you can only rename the COMMAND, KEYS, FLUSHDB, FLUSHALL, HGETALL, SCAN, HSCAN, SSCAN, and ZSCAN commands. For Proxy Cluster instances, you can also rename the DBSIZE and DBSTATS commands.
- Specify the maintenance window.
Choose a window for DCS O&M personnel to perform maintenance on your instance. You will be contacted before any maintenance activities are performed.
- Enter a description of the instance.
- Configure Parameter Configuration. Retain Default templates or select Use custom template as required.
- Specify Required Duration. Determine the purchase duration and whether to enable auto-renewal only when purchasing a yearly/monthly Redis instance.
- Specify Quantity.
- Click Next.
The displayed page shows the instance information you have specified.
- Confirm the instance information and submit the request.
- After the task is successfully submitted, the Cache Manager page is displayed. When the new instance is in the Running state, the instance is created successfully.
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