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chore(kb/aws/rds): improve clarity

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Michele Cereda
2026-02-13 23:03:56 +01:00
parent 25350873fc
commit d78d012b69
1 changed files with 21 additions and 6 deletions
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knowledge base/cloud computing/aws/rds.md
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@@ -331,6 +331,12 @@ created manual snapshots to recover it.
Taking backups can be unbearably slow depending on the amount of data needing to be copied.<br/>
For reference, the first snapshot of a DB instance with standard 100 GiB `gp3` storage took about 3h to complete.
AWS charges only for snapshots that one owns. Public snapshots _owned by other accounts_ are **not** counted.<br/>
AWS does **not** charge for backup storage of **automated** snapshots up to the size of an RDS instance, as long as
that instance is active. Any backup storage beyond this incurs additional charges.<br/>
Manual snapshots are billed **entirely** based on their storage usage.<br/>
Cross-region snapshot copies also incur additional transfer and storage charges in the destination region.
### Automatic backups
Automatic backups are storage volume snapshots of **entire** DB instances.
@@ -369,13 +375,14 @@ Automated backups will **not** occur while a DB snapshot copy is running in the
### Manual backups
Back up DB instances manually by creating DB snapshots.<br/>
The first snapshot contains the data for the full database. Subsequent snapshots of the same database are incremental.
The first snapshot contains the data for the **full** database. Subsequent snapshots of the same database are
**incremental**.
One can copy both automatic and manual DB snapshots, but only share manual DB snapshots.
Manual snapshots **never** expire and are retained indefinitely.
Manual snapshots **never** expire and are retained until explicitly deleted.
One can store up to 100 manual snapshots per Region.
One can store up to **100** manual snapshots per Region.
### Export snapshots to S3
@@ -1022,7 +1029,7 @@ Impacting factors (from most to least impactful):
1. Storage type and capacity.
1. Backup storage.
Backup storage up to 100% of one's total database storage (per region) is free.<br/>
Backup storage _for automatic snapshots_ up to 100% of one's total database storage (per region) is free.<br/>
Additional backup storage costs ~$0.095 per GB-month (`us-east-1`).<br/>
[Exporting snapshots to S3][export snapshots to s3] costs ~$0.10 per GB (`us-east-1`).
@@ -1043,6 +1050,10 @@ Impacting factors (from most to least impactful):
1. Zero-ETL integrations.
1. Extended support.
1. Networking.
Public IPv4 addresses associated with resources launched in a VPC are charged at standard rates.<br/>
This rate is $0.005/h as of 20126-02-13, and is charged in 1s increments for a minimum of 60s.
### Cost-saving measures
@@ -1050,9 +1061,9 @@ Impacting factors (from most to least impactful):
Consider changing them more appropriate ones (more recent, smaller, or Graviton-based) every few months.
- Consider leveraging [reserved instances][rds reserved instances].
Prefer using _Standard RIs_ when sticking with one instance type and **not** needing changing it for the **entire**
Prefer using _Standard_ RIs when sticking with one instance type and **not** needing changing it for the **entire**
duration of a reservation.<br/>
Otherwise, prefer _Convertible RIs_ for flexibility.
Otherwise, prefer _Convertible_ (A.K.A. _Size-flexible_) RIs for flexibility.
RDS does **not** support Savings Plans at the time of writing.
@@ -1146,6 +1157,7 @@ or write workloads and exceeds the instance type quotas.
- [Kyle Kingsbury's Amazon RDS for PostgreSQL 17.4 analysis]
- [AWS RDS Max Connections Limit As Per Instance Type]
- [Amazon RDS and Aurora credentials format]
- [Amazon RDS: Snapshot, restore, and recovery demystified]
### Sources
@@ -1168,6 +1180,7 @@ or write workloads and exceeds the instance type quotas.
- [Disabling AWS RDS backups when creating/updating instances?]
- [Viewing instance status]
- [Recommended alarms for RDS]
- [Working With Amazon RDS Snapshots: The Basics and a Quick Tutorial]
<!--
Reference
@@ -1189,6 +1202,7 @@ or write workloads and exceeds the instance type quotas.
[Amazon RDS and Aurora credentials format]: https://docs.aws.amazon.com/secretsmanager/latest/userguide/reference_secret_json_structure.html#reference_secret_json_structure_rds
[amazon rds db instance storage]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_Storage.html
[amazon rds db instances]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Overview.DBInstance.html
[Amazon RDS: Snapshot, restore, and recovery demystified]: https://aws.amazon.com/blogs/database/amazon-rds-snapshot-restore-and-recovery-demystified/
[aws kms key management]: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Overview.Encryption.Keys.html
[Changing RDS storage from gp2 to gp3]: https://repost.aws/questions/QUDPKCzJclQbCwOt47lf7lFQ/changing-rds-storage-from-gp2-to-gp3
[how can i decrease the total provisioned storage size of my amazon rds db instance?]: https://repost.aws/knowledge-center/rds-db-storage-size
@@ -1226,3 +1240,4 @@ or write workloads and exceeds the instance type quotas.
[Disabling AWS RDS backups when creating/updating instances?]: https://stackoverflow.com/questions/35709153/disabling-aws-rds-backups-when-creating-updating-instances#35730978
[Kyle Kingsbury's Amazon RDS for PostgreSQL 17.4 analysis]: https://jepsen.io/analyses/amazon-rds-for-postgresql-17.4
[Understanding AWS RDS Pricing]: https://www.bytebase.com/blog/understanding-aws-rds-pricing/
[Working With Amazon RDS Snapshots: The Basics and a Quick Tutorial]: https://n2ws.com/blog/aws-cloud/rds-snapshot