rds
15 articles on rds — what drives the cost, how it is priced, and where the savings actually are.
RDS storage autoscaling cost: convenient, but it only ratchets up
RDS storage autoscaling prevents out-of-space outages by growing your volume automatically, and the feature itself is free. The catch is that it never shrinks, so a one-time spike can leave you paying for oversized storage for the life of the instance. Here is how to use it without the ratchet.
RDS gp3 vs io1 storage cost: which database volume type to pick
RDS gp3 gives a free IOPS and throughput baseline for a flat per-GB price, while io1 charges separately for every provisioned IOPS. For most databases gp3 is dramatically cheaper. Here is the pricing, the break-even, and when io1 still earns its cost.
RDS reserved instances cost: how much they save and when to buy
RDS Reserved Instances cut the hourly rate of a database by up to about 40 percent for a one-year term and 60 percent for three years, in exchange for a commitment. Here is how the payment options compare, where the size-flexibility applies, and how to avoid over-committing.
Self-hosted database on EC2 vs RDS cost: is running your own worth it?
Running Postgres or MySQL yourself on EC2 is cheaper per hour than RDS, but RDS handles backups, failover, and patching. The premium is real, and so is the operational burden it removes. Here is when self-hosting a database pays off, with numbers.
How much does a Postgres database cost on AWS? RDS and Aurora pricing
A managed Postgres database on AWS costs the instance, the storage, the backups, and the data transfer, from around 15 dollars a month for a tiny dev instance to hundreds for production. Here is what drives RDS and Aurora Postgres pricing and how to keep it lean.
RDS Multi-AZ cost explained: paying for high availability
RDS Multi-AZ roughly doubles instance and storage cost by running a standby in a second Availability Zone for automatic failover. Here is what you actually pay for, and when the availability is worth the premium.
RDS read replica cost: scaling reads and what it adds
Each RDS read replica is a full additional instance with its own compute and storage cost, plus data transfer for cross-region replicas. Here is how read replica pricing works and how to scale reads without overpaying.
RDS vs Aurora cost: which managed database is cheaper
Standard RDS bills for provisioned instances and storage; Aurora bills for compute plus storage and I/O that scale with usage, and offers a serverless option. Which is cheaper depends on your scale, I/O pattern, and how many replicas you run. Here is the comparison.
Right-size RDS instances guide: databases without the bloat
RDS instances are often provisioned larger than the workload needs, and unlike stateless compute, resizing a database takes care. Here is how to right-size RDS instance class, storage, and IOPS to real usage without risking the database.
Database connection pooling cost impact: smaller databases, lower bills
Connection pooling lets a database serve more clients with fewer resources, so you can run a smaller, cheaper instance. The cost impact comes from avoiding over-provisioning driven by connection limits. Here is how pooling saves money.
AWS RDS Multi-AZ cost: you pay for the standby you hope never runs
Multi-AZ roughly doubles instance cost by running a standby replica, and mirrors storage, for automatic failover. Multi-AZ cluster deployments add readable standbys. Here is what you pay for high availability and when it is worth it.
Aurora Serverless v2 cost: what an ACU really costs you
Aurora Serverless v2 bills per ACU-hour (~$0.12) scaling in 0.5-ACU steps, with a ~$44/month floor unless you enable scale-to-zero. Here's when it beats provisioned Aurora and when it doesn't.
RDS Proxy cost: is the always-on charge worth it?
RDS Proxy bills per vCPU of the database it fronts, continuously, whether or not connections flow. Here's how the charge works, when it pays for itself, and when it's overhead you can skip.
Aurora I/O Optimized: when it actually pays off
Aurora I/O Optimized eliminates per-I/O charges but adds ~30% to instance/storage rates. The break-even is around 25% I/O share of total cost. Here's the math, when to switch, and how to apply it in Terraform.
RDS vs Aurora: cost decision framework
RDS is cheaper per instance hour; Aurora has more efficient storage and built-in replicas. Here's when each one wins, including Aurora I/O Optimized, Aurora Serverless v2, and Reserved Capacity options.