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AlloyDB for PostgreSQL vs Azure Database for PostgreSQL

AlloyDB for PostgreSQL: Google's Postgres-compatible service with disaggregated storage, a columnar engine and ScaNN vectors. Azure Database for PostgreSQL: Microsoft's managed community PostgreSQL, with zone-redundant HA, DiskANN vectors and Citus elastic clusters.

key differences

  • AlloyDB for PostgreSQL is built for larger datasets (≤ 1 PB) than Azure Database for PostgreSQL (≤ 10 TB).
  • Horizontal scaling is none in AlloyDB for PostgreSQL and addon in Azure Database for PostgreSQL.
  • Only AlloyDB for PostgreSQL has columnar storage, in-memory, compression.

choose alloydb for

  • +Migrating demanding Postgres or Oracle workloads to Google Cloud
  • +Operational analytics on live transactional data
  • +RAG and semantic search with vectors stored beside business data
  • +Hybrid deployments using AlloyDB Omni on-premises

best at · OLTP, HTAP, Vector search

choose azure-database-for-postgresql for

  • +Postgres backends for Azure-hosted apps
  • +AI copilots with vectors and relational data together
  • +Migrating Oracle or on-prem Postgres into Azure
  • +Multi-tenant SaaS using Elastic Clusters

best at · OLTP, Vector search, RAG

AlloyDB for PostgreSQLGoogle's Postgres-compatible service with disaggregated storage, a columnar engine and ScaNN vectors.
Azure Database for PostgreSQLMicrosoft's managed community PostgreSQL, with zone-redundant HA, DiskANN vectors and Citus elastic clusters.
overview
Primary model
Relational
Relational
Also supports
Document, Spatial, Vector, Columnar / OLAP
Document, Spatial, Vector, Graph
Type
Managed service
Managed service
Status
Active
Active
Developer
Google
Microsoft
First release
2022
2017
Latest version
–
–
License
ProprietaryProprietary (Google Cloud service; AlloyDB Omni commercial license)
ProprietaryProprietary (Azure service; engine is PostgreSQL License)
Free tier
—
✓
popularity
WhichDB Score
3.6
4.9
Rank
#430
#392
GitHub stars
–
–
Stack Overflow questions
40
214
scale & guarantees
Comfortable data size
Large (≤ 1 PB)
Medium (≤ 10 TB)
Horizontal scaling
None
Addon
Multi-region
Read replicas
Read replicas
ACID
Full
Full
Consistency
Strong
Strong
Schema
Strict
Strict
Architecture
Shared storage, Primary replica
Primary replica, Client server, Distributed
deployment
Self-hosted
✓
—
Vendor-managed cloud
✓
✓
Serverless
—
—
Embedded
—
—
Edge
—
—
Clouds
Google Cloud
Azure
capabilities
Transactions
✓
✓
Joins
✓
✓
Secondary indexes
✓
✓
Full-text search
✓
✓
Vector search
✓
✓
Geospatial
✓
✓
JSON
✓
✓
Change data capture
✓
✓
Triggers
✓
✓
Stored procedures
✓
✓
Materialized views
✓
✓
TTL / expiry
—
—
Pub/Sub
✓
✓
Columnar storage
✓
—
In-memory
✓
—
Durable persistence
✓
✓
Compression
✓
—
Encryption at rest
✓
✓
Role-based access
✓
✓
Time travel
—
—
Branching
—
—
Online schema changes
—
—
Streaming ingest
—
—
Offline sync
—
—
Runs in WebAssembly
—
—
interfaces
Query languages
SQL, PL/pgSQL
SQL, PL/pgSQL
Client languages
Java, Python, Go, JavaScript, C#, Ruby, PHP
C#, Java, Python, JavaScript, Go, PHP, Ruby, Rust
Best for
OLTP, HTAP, Vector search, RAG
OLTP, Vector search, RAG, Geo
Add more to this comparisonNot sure either fits? Try smart match

AlloyDB for PostgreSQL vs Azure Database for PostgreSQL: FAQ

What is the difference between AlloyDB for PostgreSQL and Azure Database for PostgreSQL?

AlloyDB for PostgreSQL: Google's Postgres-compatible service with disaggregated storage, a columnar engine and ScaNN vectors. Azure Database for PostgreSQL: Microsoft's managed community PostgreSQL, with zone-redundant HA, DiskANN vectors and Citus elastic clusters. AlloyDB for PostgreSQL is built for larger datasets (≤ 1 PB) than Azure Database for PostgreSQL (≤ 10 TB). Horizontal scaling is none in AlloyDB for PostgreSQL and addon in Azure Database for PostgreSQL. Only AlloyDB for PostgreSQL has columnar storage, in-memory, compression.

When should I choose AlloyDB for PostgreSQL over Azure Database for PostgreSQL?

Choose AlloyDB for PostgreSQL for migrating demanding Postgres or Oracle workloads to Google Cloud; operational analytics on live transactional data; and RAG and semantic search with vectors stored beside business data. Choose Azure Database for PostgreSQL for postgres backends for Azure-hosted apps; AI copilots with vectors and relational data together; and migrating Oracle or on-prem Postgres into Azure.

Is AlloyDB for PostgreSQL or Azure Database for PostgreSQL more popular?

Azure Database for PostgreSQL ranks #392 on the WhichDB Score (4.9/100) and AlloyDB for PostgreSQL ranks #430 (3.6/100). Popularity is not fit: check the requirements that matter for your project.

Are AlloyDB for PostgreSQL and Azure Database for PostgreSQL open source?

No. AlloyDB for PostgreSQL is proprietary, closed-source software. No. Azure Database for PostgreSQL is proprietary, closed-source software.