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Amazon RDS vs Microsoft SQL Server

Amazon RDS logo

Amazon RDS

Software

Set up, operate, and scale a relational database in the cloud

From
On request
Rated
-
Full reviewWebsite
Microsoft SQL Server logo

Microsoft SQL Server

Software

Enterprise-grade relational database management system

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Microsoft SQL Server has a free tier, so it costs nothing to try first.
  • Each has a real cost: Amazon RDS no super-user access or direct host connectivity limits advanced customization; Microsoft SQL Server licensing and on-premises deployment costs are high compared to open-source alternatives, with Enterprise Edition exceeding $60,000 for minimum core requirements
  • They diverge on capability: Amazon RDS covers Multiple DB Engines, Microsoft SQL Server covers T-SQL.

Where they differ

Only the attributes on which Amazon RDS and Microsoft SQL Server actually diverge.

Attributes where Amazon RDS and Microsoft SQL Server differ
AttributeAmazon RDSMicrosoft SQL Server
Starting priceOn requestFree
Free tierNoYes
PlatformsAWS Cloud, Multi-AZ, Multi-regionWindows Server, Linux (RHEL, SUSE, Ubuntu), Docker, Azure
Founded20061989

Identical on both: pricing model (Unknown), user rating (Not yet rated), category (Unknown).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Amazon RDS

  • Multiple DB Engines
  • Automated Backups
  • Multi-AZ Deployment
  • Read Replicas
  • Encryption
  • Performance Insights
  • Automatic Scaling
  • MySQL

Only in Microsoft SQL Server

  • T-SQL
  • ACID Compliance
  • Advanced Security
  • In-memory OLTP
  • Columnstore Indexes
  • Always On Availability
  • Machine Learning Services
  • Azure

What people use each for

The jobs each tool is most often brought in to do.

Amazon RDS

  • Transaction processing
  • Data storage
  • Application backend
  • Reporting
  • Data analytics

Microsoft SQL Server

  • Transaction processing
  • Data storage
  • Application backend
  • Reporting
  • Data analytics

Both are used for transaction processing, data storage, application backend, reporting, data analytics, on those jobs the choice comes down to price and fit rather than capability.

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Amazon RDS

  • No super-user access or direct host connectivity limits advanced customization
  • Pricing unpredictable and expensive compared to GCP alternatives with equivalent features
  • Limited access to system procedures and tables requiring advanced permissions
  • No Oracle RAC (Real Application Clusters) support for high-availability Oracle deployments

Microsoft SQL Server

  • Licensing and on-premises deployment costs are high compared to open-source alternatives, with Enterprise Edition exceeding $60,000 for minimum core requirements
  • Performance monitoring toolset is insufficient for hybrid cloud environments requiring real-time analytics across multiple deployment types
  • Heavy I/O resource consumption can saturate disk volumes and degrade performance when processing large transaction workloads
  • Always On availability groups with up to 8 secondary replicas are limited to Enterprise edition only; Standard supports only basic availability groups with 2 replicas
  • CPU and memory scaling is capped at 4 sockets or 32 cores on Standard edition, limiting deployments requiring higher compute capacity

Pricing, plan by plan

Amazon RDS

On request

No published plan breakdown. See the Amazon RDS review.

Microsoft SQL Server

Free
  • ExpressFree
    • 4 cores maximum
    • 1.4 GB memory per instance
    • 50 GB database size limit
  • DeveloperFree
    • All Enterprise features
    • Non-production use only
  • Standard$3945/per 2-core pack
    • 32 core maximum per instance
    • 256 GB buffer pool memory
    • Basic availability groups with 2 replicas
  • Enterprise$15123/per 2-core pack
    • Unlimited scaling
    • Always On with up to 8 secondaries
    • Advanced security and HA features

Which should you pick?

Choose Amazon RDS if

  • You need multiple db engines.
  • You work on AWS Cloud, Multi-AZ, Multi-region.
  • You also want automated backups.
Amazon RDS review

Choose Microsoft SQL Server if

  • You need t-sql.
  • You want to start without paying.
  • You work on Windows Server, Linux (RHEL, SUSE, Ubuntu), Docker, Azure.
  • You also want acid compliance.
Microsoft SQL Server review

Questions people ask

Is Amazon RDS or Microsoft SQL Server better?
Neither clearly leads. Amazon RDS starts at On request and Microsoft SQL Server at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Amazon RDS or Microsoft SQL Server?
Microsoft SQL Server has a free tier; the other does not. Paid plans start at On request for Amazon RDS and Free for Microsoft SQL Server.
Does Amazon RDS or Microsoft SQL Server run on more platforms?
Amazon RDS runs on AWS Cloud, Multi-AZ, Multi-region. Microsoft SQL Server runs on Windows Server, Linux (RHEL, SUSE, Ubuntu), Docker, Azure.
Can I use Microsoft SQL Server for free?
Yes. Microsoft SQL Server has a free tier, so you can try it without paying. Amazon RDS starts at On request.
What is Amazon RDS best used for?
Amazon RDS is most often used for transaction processing, data storage, application backend, reporting.
What can Amazon RDS do that Microsoft SQL Server cannot?
Amazon RDS covers Multiple DB Engines, Automated Backups, Multi-AZ Deployment, Read Replicas. Microsoft SQL Server covers T-SQL, ACID Compliance, Advanced Security, In-memory OLTP.

Answered from the vendors’ own pages

Amazon RDS: What databases does Amazon RDS support?

Amazon RDS supports Amazon Aurora, PostgreSQL, MySQL, MariaDB, Oracle Database, and Microsoft SQL Server as managed database engines.

Source
Microsoft SQL Server: What is the pricing model for SQL Server?

SQL Server uses core-based licensing with per-2-core pack pricing. Enterprise Edition costs approximately $15,123 per 2-core pack (minimum 8 cores). Standard Edition costs approximately $3,945 per 2-core pack. Developer and Express editions are free. Software Assurance adds 25-35% annually for upgrades and support.

Source
Amazon RDS: Does Amazon RDS handle backups automatically?

Yes. Amazon RDS automates backup configuration, backing up your database and transaction logs. Blue/Green Deployments allow safer updates by mirroring production in staging before applying changes.

Source
Microsoft SQL Server: Does SQL Server run on Linux?

Yes. SQL Server 2017 and later run on Linux (Red Hat Enterprise Linux, SUSE Linux Enterprise Server, Ubuntu), Docker containers, and Windows with feature parity including Always On availability groups, Active Directory authentication, and encryption.

Source
Amazon RDS: How does Amazon RDS Proxy improve performance?

Amazon RDS Proxy is a managed database proxy that makes applications more scalable by reducing database connection overhead, more resilient to database failures, and more secure through built-in authentication.

Source
Microsoft SQL Server: Is there a free edition of SQL Server?

Yes. SQL Server Express is free and includes all functionality of Enterprise edition for development and testing, with limits of 4 cores, 1,410 MB memory per instance, and 50 GB per database. Developer edition is also free for non-production use.

Source
Amazon RDS: Does Amazon RDS provide read replicas?

Yes. Amazon RDS supports read replicas across availability zones and regions, enabling horizontal scaling of read capacity while maintaining a single write primary.

Source
Microsoft SQL Server: Can SQL Server be deployed offline?

Yes. SQL Server can be installed from offline media on machines without internet access. Microsoft provides complete offline installation packages for SQL Server, SSMS, and supporting components, making deployment in isolated or air-gapped environments feasible.

Source
Amazon RDS: Can I access the host directly via SSH or Remote Desktop?

No. Amazon RDS does not allow direct host access via SSH, Telnet, or Windows Remote Desktop Connection. Database access is limited to database clients and management console.

Source
Microsoft SQL Server: What high availability options does SQL Server provide?

SQL Server offers Always On availability groups (Enterprise only), Always On failover cluster instances, database mirroring, log shipping, and for disaster recovery, failover servers in Azure and Accelerated Database Recovery for faster recovery after failures.

Source
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