Purchase Method

Overview
This document describes how to purchase and configure a TencentDB for Redis® instance in the following two ways:
Console: You can configure the instance parameters and directly make a purchase in the web console.
API: You can call the CreateInstances API to make a purchase.
Preparations for purchase
You have registered a Tencent Cloud account and completed identity verification.
Click here to complete identity verification.
You have determined a region and AZ for the instance. For more information, see Regions and AZs.
You have determined the specification and performance requirements of the instance. For more information, see Memory Edition (Standard Architecture) and Performance.
You have determined a VPC and security group for the instance. For more information, see Virtual Private Cloud and Configuring Security Group.
To deploy the instance across multiple AZs in the same region, learn more about the architecture of multi-AZ deployment first.
To support read/write separation, learn more about how it is implemented first.
You have checked out the billing details of the instance. For more information, see Billing Overview. Database fees for one hour will be frozen when you create a pay-as-you-go database. Make sure that your account balance is sufficient before making a purchase.
Purchasing in the console
1. Log in to the TencentDB for Redis® purchase page with your Tencent Cloud account.
2. Configure the instance as needed based on the parameter descriptions below:
Parameter
Required
Description
Billing Mode
Yes
Currently, only pay-as-you-go is supported.
Region
Yes
Select a region where your instance resides. You should select a region closest to you to reduce access latency.
Note that the region cannot be changed after the instance is successfully created.
We recommend that you select the same region as the CVM instance for private network communication.
The private network between cloud products in different regions is not interconnected and cannot be changed after purchase, so choose carefully. For example, a cloud server in the Guangzhou region cannot access Redis in the Shanghai region via the private network. If cross-region private network communication is needed, see CCN (Cloud Connect Network, CCN).
Instance Edition
Yes
Redis Edition: A high-performance edition based on the open-source Redis.
Memcached Edition: A high-performance edition designed specifically for caching scenes based on the Memcached protocol version 1.6.
Compatible Version
Yes
Redis Edition: Compatible with Redis 7.0, 6.2, 5.0, 4.0, and 2.8. Redis 2.8 is currently not available for purchase. It is recommend to choose version 4.0 or later. If you need version 2.8, submit a ticket to apply.
Memcached Edition: Compatible with Memcached protocol version 1.6.
Architecture
Yes
Choose the product deployment architecture. For more information, see Standard Architecture and Cluster Architecture.
Redis Edition: Version 4.0 and later supports both standard and cluster architectures. Version 2.8 only supports standard architecture.
Memcached Edition: Only supports cluster architecture.
Memory
Yes
Configure the required memory size (0.25–64 GB) if you select Standard Architecture for Architecture.
Replica Quantity
Yes
Select the number of database replicas. Multiple replicas provide master-replica high availability, enhancing the data security. Replicas can also be used to enhance the read-only performance.
The replica quantity may vary by region or edition as configured in the console by default.
Shard Quantity
Yes
Set the number of shards as needed if you select Cluster Architecture for Architecture. The more the shards, the larger the cluster storage capacity.
Shard Capacity
Yes
Set the capacity of each shard if you select Cluster Architecture for Architecture.
Note：
For newly purchased instances, the maximum network throughput here already includes the default additional bandwidth. The additional bandwidth for one shard is consistent across both standard and cluster architectures.
Specs Preview
-
Preview the selected specification and the supported maximum number of connections and maximum network throughput to verify whether they meet your expectations.
Read-Only Replica
No
Select whether to enable the read-write separation feature. Only the Redis Memory Edition supports this feature, and the Memcached Edition does not.
When read-write separation is enabled, write operations are routed to the primary node, while read operations are routed to replica nodes. Data read from the replica node may be delayed compared with the primary node.
If not enabled during purchase, it can be enabled later based on actual business needs. For more information, see Read-Write Separation.
Network Type
Yes
Currently, only VPC is supported.
AZ
Yes
Choose whether to enable multi-AZ deployment. Both single-AZ deployment and multi-AZ deployment are supported. Multi-AZ deployed instances have higher availability and better disaster recovery capability than single-AZ deployed instances. For more information, see Multi-AZ Deployment.
For single-AZ deployment, select the AZ of the master node in **Master Node Group (Master AZ)**.
For multi-AZ deployment, select the master AZ from the drop-down list of **Master Node Group (Master AZ)**, and specify the AZs for replicas in the drop-down lists of replicas.
IPv4 Network
Yes
Select the VPC and subnet. We recommend that you select the same VPC in the same region as the CVM instance to be connected to.
VPCs are region-specific (e.g., Guangzhou), while subnets are AZ-specific (e.g., Guangzhou Zone 1). One VPC can be divided into one or multiple subnets, which are interconnected over the private network by default. Different VPCs are isolated over the private network by default, no matter whether they are in the same or different regions.
You can switch the VPC after instance purchase as instructed in Configuring Network. You can also click Create VPCs and Create Subnets to create the desired network environment as instructed in Creating VPC.
Port
Yes
Custom port. The default port is 6379. The value range is [1024,65535].
Parameter Template
Yes
Select the parameter template associated with the instance.
You can apply a parameter template to configure parameters in batches for the instance.
The system will automatically adapt the corresponding default template based on the selected compatible version and architecture. For more information, see the default template in Applying Parameter Templates.
Project
Yes
Assign your instance to a project for easy management.
Tag
No
Add tags to your instance for easy classification and management. Click Add to select tag keys and values.
Security Group
Yes
Set security group rules to control the inbound traffic to your database. 
You can either select a security group from the Existing Security Groups drop-down list or click Custom Security Groups to create one and set inbound rules. For more information, see Configuring Security Group.
After selecting the security group from the dropdown list, you can click Rule Preview to view the protocol rule policies of that security group.
Alarm Policy
Yes
Select the alarm policy for the monitoring metric.
If it is not selected, TencentDB for Redis® provides a default alarm policy. You can access the Tencent Cloud Observability Platform (TCOP) to view the default policy on the alarm management page.
Select a custom alarm policy. First log in to the Tencent Cloud Observability Platform (TCOP) to configure the alarm policy on the Alarm Management page. For detailed directions, see Create Alarm Policy.
Instance Name
Yes
Enter up to 60 letters, digits, hyphens, and underscores.
Set Password
Yes
Choose the authentication method, supporting both Password Authentication and Password-Free Authentication. Password Authentication is the default option. Tencent Cloud Memcached Edition only supports password-free authentication, enabling Password-Free Access.
Password
No
If you select Password Authentication for Set Password, you need to set an access password for the instance according to the following requirements:
It can contain [8,64] characters.
It must contain at least two of the following four types: lowercase letters, uppercase letters, digits, and symbols (()`~!@#$%^&*-+=_|{}[]:;<>,.?/).
It cannot start with a slash (/).
Confirm Password
No
Enter the access password for the instance again.
Quantity
Yes
The maximum number of instances you can purchase at a time is 30, with a regional quota of 200 instances.
Terms of Service
Yes
Read TencentDB Service Level Agreement and Service Level Agreement and select I have read and agreed to.
3. After verifying that the parameters are correctly configured, click Buy Now. After the purchase success message is displayed, click Go to Console. After the instance becomes Running in the status , you can use it normally.
Note:
After activating TencentDB for Redis®, make sure that your account balance is sufficient. An insufficient balance may cause overdue payments or even instance repossession. For more information, see Payment Overdue.
For subsequent operations, see Creating TencentDB for Redis® Instance.
Purchasing via APIs
API
Description
﻿CreateInstances﻿
Creates a TencentDB for Redis® instance

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Yes

Parameter	Required	Description
Billing Mode	Yes	Currently, only pay-as-you-go is supported.
Region	Yes	Select a region where your instance resides. You should select a region closest to you to reduce access latency. Note that the region cannot be changed after the instance is successfully created. We recommend that you select the same region as the CVM instance for private network communication. The private network between cloud products in different regions is not interconnected and cannot be changed after purchase, so choose carefully. For example, a cloud server in the Guangzhou region cannot access Redis in the Shanghai region via the private network. If cross-region private network communication is needed, see CCN (Cloud Connect Network, CCN).
Instance Edition	Yes	Redis Edition: A high-performance edition based on the open-source Redis. Memcached Edition: A high-performance edition designed specifically for caching scenes based on the Memcached protocol version 1.6.
Compatible Version	Yes	Redis Edition: Compatible with Redis 7.0, 6.2, 5.0, 4.0, and 2.8. Redis 2.8 is currently not available for purchase. It is recommend to choose version 4.0 or later. If you need version 2.8, submit a ticket to apply. Memcached Edition: Compatible with Memcached protocol version 1.6.
Architecture	Yes	Choose the product deployment architecture. For more information, see Standard Architecture and Cluster Architecture. Redis Edition: Version 4.0 and later supports both standard and cluster architectures. Version 2.8 only supports standard architecture. Memcached Edition: Only supports cluster architecture.
Memory	Yes	Configure the required memory size (0.25–64 GB) if you select Standard Architecture for Architecture.
Replica Quantity	Yes	Select the number of database replicas. Multiple replicas provide master-replica high availability, enhancing the data security. Replicas can also be used to enhance the read-only performance. The replica quantity may vary by region or edition as configured in the console by default.
Shard Quantity	Yes	Set the number of shards as needed if you select Cluster Architecture for Architecture. The more the shards, the larger the cluster storage capacity.
Shard Capacity	Yes	Set the capacity of each shard if you select Cluster Architecture for Architecture. Note： For newly purchased instances, the maximum network throughput here already includes the default additional bandwidth. The additional bandwidth for one shard is consistent across both standard and cluster architectures.
Specs Preview	-	Preview the selected specification and the supported maximum number of connections and maximum network throughput to verify whether they meet your expectations.
Read-Only Replica	No	Select whether to enable the read-write separation feature. Only the Redis Memory Edition supports this feature, and the Memcached Edition does not. When read-write separation is enabled, write operations are routed to the primary node, while read operations are routed to replica nodes. Data read from the replica node may be delayed compared with the primary node. If not enabled during purchase, it can be enabled later based on actual business needs. For more information, see Read-Write Separation.
Network Type	Yes	Currently, only VPC is supported.
AZ	Yes	Choose whether to enable multi-AZ deployment. Both single-AZ deployment and multi-AZ deployment are supported. Multi-AZ deployed instances have higher availability and better disaster recovery capability than single-AZ deployed instances. For more information, see Multi-AZ Deployment. For single-AZ deployment, select the AZ of the master node in Master Node Group (Master AZ). For multi-AZ deployment, select the master AZ from the drop-down list of Master Node Group (Master AZ), and specify the AZs for replicas in the drop-down lists of replicas.
IPv4 Network	Yes	Select the VPC and subnet. We recommend that you select the same VPC in the same region as the CVM instance to be connected to. VPCs are region-specific (e.g., Guangzhou), while subnets are AZ-specific (e.g., Guangzhou Zone 1). One VPC can be divided into one or multiple subnets, which are interconnected over the private network by default. Different VPCs are isolated over the private network by default, no matter whether they are in the same or different regions. You can switch the VPC after instance purchase as instructed in Configuring Network. You can also click Create VPCs and Create Subnets to create the desired network environment as instructed in Creating VPC.
Port	Yes	Custom port. The default port is 6379. The value range is [1024,65535].
Parameter Template	Yes	Select the parameter template associated with the instance. You can apply a parameter template to configure parameters in batches for the instance. The system will automatically adapt the corresponding default template based on the selected compatible version and architecture. For more information, see the default template in Applying Parameter Templates.
Project	Yes	Assign your instance to a project for easy management.
Tag	No	Add tags to your instance for easy classification and management. Click Add to select tag keys and values.
Security Group	Yes	Set security group rules to control the inbound traffic to your database. You can either select a security group from the Existing Security Groups drop-down list or click Custom Security Groups to create one and set inbound rules. For more information, see Configuring Security Group. After selecting the security group from the dropdown list, you can click Rule Preview to view the protocol rule policies of that security group.
Alarm Policy	Yes	Select the alarm policy for the monitoring metric. If it is not selected, TencentDB for Redis^® provides a default alarm policy. You can access the Tencent Cloud Observability Platform (TCOP) to view the default policy on the alarm management page. Select a custom alarm policy. First log in to the Tencent Cloud Observability Platform (TCOP) to configure the alarm policy on the Alarm Management page. For detailed directions, see Create Alarm Policy.
Instance Name	Yes	Enter up to 60 letters, digits, hyphens, and underscores.
Set Password	Yes	Choose the authentication method, supporting both Password Authentication and Password-Free Authentication. Password Authentication is the default option. Tencent Cloud Memcached Edition only supports password-free authentication, enabling Password-Free Access.
Password	No	If you select Password Authentication for Set Password, you need to set an access password for the instance according to the following requirements: It can contain [8,64] characters. It must contain at least two of the following four types: lowercase letters, uppercase letters, digits, and symbols (()`~!@#$%^&*-+=_\|{}[]:;<>,.?/). It cannot start with a slash (/).
Confirm Password	No	Enter the access password for the instance again.
Quantity	Yes	The maximum number of instances you can purchase at a time is 30, with a regional quota of 200 instances.
Terms of Service	Yes	Read TencentDB Service Level Agreement and Service Level Agreement and select I have read and agreed to.

API	Description
CreateInstances	Creates a TencentDB for Redis^® instance

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Overview

Preparations for purchase

Purchasing in the console

Purchasing via APIs