PolarDB is a cloud-native relational database compatible with MySQL, PostgreSQL, and Oracle. PolarDB provides the performance and availability of traditional enterprise databases and the flexibility and cost-effectiveness of open-source databases.

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Unleash the Power of PolarDB: Get Your Always Free PolarDB Instance Now
PolarDB instances (all three variations) are completely free of charge when you use no more than 1 instance (2C8G), and one storage package up to 50GB. Click the link below to register, and renew each month to continue this benefit.
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Your application will be approved automatically if resources are available in your specified region. Click the following links to set up your free PolarDB once approved:
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Get Free PolarDB Storage of 50GB >

Product News

Use PolarDB Storage Plan To Save More
If you need to store a large amount of data, such as 1,000 GB of data or more, storage plans are more cost-effective. The storage costs reduces from the day you use PolarDB Storage Package.
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PolarDB MySQL 8.0 Archive Database Available For Commercial Use
Using X-Engine instead of InnoDB as its default Storage Engine, which can store data up to 200TB but with lower costs reducing by up to 70%, PolarDB MySQL 8.0 Archive Database is suitable for archive data with low demand for computing such as orders and social messages.
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PolarDB for MySQL
100% compatible with open-source MySQL and RDS MySQL
Learn How To Use >

PolarDB for PostgreSQL
Decouple of compute and storage, extreme auto scaling, lower TCO
Learn How To Use >

PolarDB for Oracle
High compatible with Oracle syntax, supports migration from all Oracle versions
Learn How To Use >

PolarDB is designed for business-critical database applications that require fast performance, high concurrency, and automatic scaling. You can scale up to millions of queries per second and 100 TB per database cluster with 15 low latency read replicas. PolarDB is six times faster than standard MySQL databases, and delivers the security, reliability, and availability of traditional commercial databases at 1/10 the cost. PolarDB embodies the proven database technology and best practices honed over the last decade that supported hyper-scale events such as the Alibaba Double 11 Global Shopping Festival.

On November 11, 2018, PolarDB successfully supported 1 billion orders in 24 hours, during which the number of queries received per second spiked by 122 times.

Always Free PolarDB Instance

To support the developer community, we are introducing Always Free PolarDB campaign for all variations. After successful participation, one resource of specified specification can be used for free. Regional resource availability is subject to change. When resources are not available in certain regions, you can switch your free tier instance to a different region, or switch to a paid plan in any specific region. For more information, please read the 「Terms & Conditions」 carefully.
Click Apply Now > to get your Always Free PolarDB now.


PolarDB Instance

Only one PolarDB instance is allowed to claim.

Free Specs

  • PolarDB for MySQL: 2C8G General-purpose
  • PolarDB for PostgreSQL: 2C8G Dedicated
  • PolarDB for Oracle: 2C8G Dedicated
  • 50GB Storage

Available Region

Australia(Sydney) | China(Hong Kong) | Germany(Frankfurt) | Japan(Tokyo) | Singapore | UK(London)

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Large storage capacity
PolarDB supports up to 100 TB of data. You can scale out an instance up to 16 nodes and each node supports up to 88 vCPUs. PolarDB also automatically adjusts the storage space based on your requirements. Fees are charged based on the storage that you use, helping you lower development costs.
Top performance and quick response to a sudden load
PolarDB decouples compute and storage resources, giving it 6 times faster than standard MySQL databases in high concurrency scenarios. The compute and storage nodes are optimized to increase resource utilization rate. A single node can handle up to 1 million QPS and takes less than 5 minutes to be added.
High stability and data security
PolarDB uses the ‘one primary node, multiple replicas’ architecture, in which all read/write and read-only nodes of the same instance access the same replica, greatly reducing storage costs. PolarDB also supports active/standby switchovers to prevent data loss and data inconsistency caused by asynchronous replication. Read-only replicas can be created within minutes to back up and restore data.
High compatibility
PolarDB is fully compatible with MySQL. You can migrate data to Alibaba Cloud without modifying the code. PolarDB will soon be fully compatible with the PostgreSQL and Oracle engines.


Compute and Storage Decoupling

PolarDB has optimized the performance of CPUs and memory, and reduces the costs of storage.

Dedicated compute and storage features

Compute nodes (DB servers) execute SQL statements, read data, and write data. Storage nodes (data chunk servers) store data and database snapshots and are grouped into clusters.

Improves resource usage and computing performance

PolarDB is 6 times faster than standard MySQL database in handling large amounts of concurrent queries. Each node can handle more than 1 million QPS, and it takes less than 5 minutes to scale out the number of compute nodes.

On-demand storage capacity

When you purchase an PolarDB cluster, you do not need to specify the storage space.

Shared storage

For PolarDB, all nodes in a cluster share the same replica stored on storage nodes.

Large storage capacity

Each PolarDB cluster supports to scale up to 100 TB and can be scaled out to up to 16 nodes. Each node can have up to 88 vCPUs.

Quick scale-out of read-only instances

You do not need to replicate data when adding read-only nodes. A read-only instance can be created in a few minutes.

Free storage for read-only instances

To add a read-only instance, you only need to pay for the compute nodes. There are no storage fees for the read-only instance.

RDMA-capable network and optimized backup feature

PolarDB supports RDMA-capable networks and the latest PAXOS block storage technology.

Quick data backup and recovery

PolarDB enables you to back up data in a few seconds. When a node fails, you can simply restart the process to resume the service.

A full backup within minutes

PolarDB features the copy-on-write technology that create a snapshot in a few seconds, or create a full copy of the data in a few minutes.

Zero data loss during primary and secondary switchovers

This resolves the issue of data inconsistency between read-only and read/write nodes caused by asynchronous replication.

Quick data migration

PolarDB supports easily migrating RDS for MySQL 5.6 databases to PolarDB.

For more information, see the PolarDB documentation.


  • Typical scenario
Typical scenario

Typical scenario

PolarDB is widely adopted by users in New Retail, Gaming, Internet Finance, and Live-streaming.

PolarDB supports scenarios challenged by high concurrency and sudden traffic volume increase, such as in promotions and flash sales. Instances can be scaled out within seconds, meeting the read/write requirements for enterprise-level large-scale data analysis. Scale-out events can be quickly implemented and the availability of database clusters is enhanced, while keeping storage costs at a minimum.

Problems solved

  • Size Limitations

    Due to the limitations of traditional MySQL databases, such as the use of physical disks and traditional data backup technology, a MySQL database is typically no more than 3 TB. To keep up with the rapid growth of data, you have to scale-out clusters, migrate data, and shard databases. This not only increases development costs but also causes service interruptions.

  • Scalability Limitations

    In a traditional storage architecture, read/write and read-only nodes have their data replicas. If you want to add a read-only node, you have to replicate all of the existing data. Typically, the full replication process is time-consuming, making this scaling option inefficient.

  • Data Consistency and Availability Limitations

    Traditional MySQL read/write nodes and read-only nodes use incremental synchronization to sync data, which takes time to reach read consistency on both nodes. If an application retrieves data from the read-only node, the consistency of the data read cannot be guaranteed. In addition, the synchronization delay may also adversely affect node switchover and cluster availability.

Related Services

Top Scientists Live: Tech Secrets to Double 11's Success Revealed

Introduces the technologies and system architecture of PolarDB behind the success of Alibaba Double 11 Global Shopping Festival.

Watch Now

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Best Practices

Learn How Alibaba Cloud's Databases Could Support 87 Million Transactions per Second

Uncovers how PolarDB maximizes its performance in transactional scenarios.

Best Practices

All-New High-Performance PolarDB Stack, Highly Compatible with Oracle

Introduces the features of PolarDB Box and the best practices for Oracle scenarios.

Best Practices

Seizing the Opportunity in the New Cloud Native Battlefield

Introduces the technical benefits of PolarDB.

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Setting up Database Performance Benchmarking on Alibaba Cloud

This document gives you a guidance to implement database performance tests based on commonly used benchmarks, including the Transaction Processing Performance Council (TPC) and sysbench benchmarks.


Building an Auto Scaling System on Alibaba Cloud

This solution allows you to automatically adjust the compute capacity in response to traffic fluctuations. The contents include database scaling to meet increased data demands and Redis caching across zones to ease the load on the database.

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Getting Started

PolarDB: A Technical Guidebook

PolarDB User Guide


Creating a Robust Cloud-Based Database for Fintech, E-Commerce and Gaming

Introduces typical industry solutions of ApsaraDB for PolarDB.


Introducing Alibaba Cloud's Database Solutions

Describes how Alibaba Cloud database services support and secure your workloads.


Introducing Cloud-Native Databases

Download our ebook on cloud-native databases to discover more about getting the most out of innovative Database as a Service products and services.

View All

Related Videos

Let Your Database Amaze

PolarDB Tutorial: PolarDB High Availability Solution and Java JDBC Program Writing

How To Use PolarDB MySQL GDN (Global Database Network)

Certification course: Alibaba Cloud PolarDB Technical Essentials

Understand Alibaba Cloud PolarDB basic functions and operation details.

0.01 USD

Original price: USD 10.00

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Offer Terms & Conditions

The offers detailed on this page are valid for as long as the page shows. The offers apply only to purchases of the specific products listed on this page from Alibaba Cloud. All shown below do not apply to purchases made at third-party resellers.

Instance specifications and terms are as follows:

a. When the usage does not exceed 1 PolarDB instance of 2C8G (2-core and 8GB of memory) and the storage usage of that instance does not exceed 50GB, the fee is fully free.
b. Regional resource availability is subject to change. When resources are not available in certain regions, you can switch your free tier instance to a different region, or switch to a paid plan in any specific region.
c. Each user can participate at most once a month, and after each successful participation, the free benefits will be valid for the month, and the benefits will expire if the benefits are not used in the same month. If the benefits expire, you can reapply.
d. Applications can only be made through Alibaba Cloud accounts, but not through sub-accounts. After the application is submitted, the application result will be sent by email and message to your account within 3-7 business days. If the application is approved, you can use the free benefits immediately. The benefits are only applicable to launch new resources, free renewal of existing resources is not allowed.


These are the terms and conditions that apply to promotions on alibabacloud.com, including ones where you must select products as part of the offer. No alternative terms and conditions apply.
• Alibaba Cloud reserves the right to modify or cancel the offer at any time.
• These offers only apply to products and digital content.
• These offers are limited to one per customer and account. If you have multiple accounts, only one account is eligible to participate.
• Only users that have passed our Real Name Registration verification process are eligible to participate.
• A user is eligible no more to purchase subscription instances with the promotion if there is already one user in its name(with same CID) applied the offer.
• Each of these offers may not be combined with other offers.
• Each of these offers are non-transferrable and may not be resold.
• Discounts and promotions will apply automatically when you check out if all terms and conditions have been met.
• If you violate any of the offer terms, the offer will be made invalid.

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Upgraded Support For You

1 on 1 Presale Consultation, 24/7 Technical Support, Faster Response, and More Free Tickets.

1 on 1 Presale Consultation

Consulting by experienced cloud experts.Learn More

24/7 Technical Support

Extended service time from 10 hours 5 days a week to 24/7. Learn More

6 Free Tickets per Quarter

The number of free tickets doubled from 3 to 6 per quarter. Learn More

Faster Response

Shorten after-sale response time from 36 hours to 18 hours. Learn More

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More Information About PolarDB

PolarDB Documentation > PolarDB Console >
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