Question
Backups and Point In Time Restore (PITR)
- Posted on January 17, 2020
- DigitalOcean Managed MySQL Database
Asked by petersys
I currently use AWS RDS. Looking at your managed database pages and the documentation it’s not clear if, like AWS, you’re taking snapshots every 5 minutes in addition to the daily backups - or there is only the daily backup?
What is the Recovery Point Objective (RPO) of your managed MySQL databases? This is assuming user error, so a cluster does not help as the mistake will be replicated.
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Hey petersys 👋
The service takes a single full backup every 24 hours; the write ahead log (WAL) is backed up approximately every 5 minutes, enabling point-in-time-restore operations.
If user error occurs that needs to be rolled back, the best way to accomplish this is to create a new service from a backup at a point-in-time prior to the error. Once the new service is online, the original service can be destroyed.
Hey @petersys
Sorry for the delay here. A multi-node setup would have reduced RPO due to standby nodes being promoted and taking over write and read operations right away. For a single-node service, a failure will cause the loss of data in the WAL that has not yet been committed to the backup service (5 min or less as outlined above). For multi-node services, any loss of data is a function replication lag. Replication to standby nodes is asynchronous but close to real-time.
Thanks!
For a single-node, non-HA services, it is fair to assess the RPO as approximately 5 minutes. Users who require reduced RPO should configure their Managed Database services with one or more standby nodes.