3.3 Managed relational databases
You can run a production database without becoming a DBA, and know which parts are still yours.
Before:02. ComputeUnlocks:04. Networking in the Cloud08. Observability & Reliability
The same thing, three names
One idea, sold under a different brand by each provider. Learn it once and you can read any job advertisement.
- On AWS
- RDS / Aurora
- On Azure
- Azure Database for PostgreSQL/MySQL, SQL Database
- On Google Cloud
- Cloud SQL / AlloyDB
A managed database service takes patching, backups and failover off your desk while leaving schema, queries and connections firmly on it, and this topic maps that split. Point-in-time recovery, read replicas and multi-zone failover are the machinery; testing a restore is the habit. It anchors the storage module because most applications still stand on a relational database. The classic outage gets its own item — too many connections — because connection limits and poolers are the part of database operations the managed service does not manage for you.
Work through these
Provisioning, versions and maintenance windows
The provider handles installation, version upgrades and patching, but maintenance happens in a window you choose and it does involve interruption. Setting that window deliberately avoids an unpleasant surprise.
Backups, point-in-time recovery and testing a restore
Automatic backups and the ability to rewind to a moment in time are the features you are paying for, and neither is proven until you have performed a restore. Doing one on purpose is the item.
Read replicas, failover and multi-zone deployments
Copies that serve reads, automatic promotion when the primary fails, and spreading across zones are three different protections against three different problems. Buying one and expecting another is a common mistake.
Connection limits, poolers and the classic 'too many connections' outage
Databases accept a limited number of simultaneous connections, and applications that open one per request exhaust them under load. A connection pooler is the standard fix, and knowing the symptom saves hours.
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