4x
Faster than Standard PostgreSQL
For transactional workloads.
100x
Faster Analytical Queries
With the integrated columnar engine.
99.99%
Availability SLA
Inclusive of maintenance.
The Architectural Revolution: Disaggregated Compute & Storage
AlloyDB's core innovation is separating the PostgreSQL query engine from an intelligent, distributed storage layer. This offloads work from the primary instance, enabling superior performance, elastic scaling, and high availability. The diagram below illustrates the data flow for write and read operations.
Write Path (Fast & Durable)
1. Client Writes to Primary
`INSERT`, `UPDATE` statement
2. WAL Record to Log Service
Commit is confirmed to client now.
3. Log Processing Service (LPS)
Asynchronously applies logs to data blocks in shared storage.
Read Path (Multi-Layer Cache)
1. Client Reads from Replica
`SELECT` statement
2. Check Local Caches (L1/L2)
Serves from memory if available.
3. Fetch from LPS / Storage
LPS serves from its own cache (L3) or materializes the data page on demand.
Availability by Design
The architecture provides industry-leading guarantees for mission-critical systems.
<60 Seconds
Automatic Failover
Standby instances connect to shared storage, eliminating slow data copy operations.
<1 Second
Downtime for Maintenance
Seamlessly hot-swaps endpoints during patching or scaling.
Competitive Landscape: Performance & Value
AlloyDB was built to compete directly with other hyperscaler offerings. Independent benchmarks show it leading on both raw performance and total cost of ownership (TCO), driven by superior efficiency and a simpler pricing model that eliminates expensive I/O charges.
Feature Comparison
Price-Performance (TPC-C)
The Autopilot Advantage
ML-powered systems automate complex database administration, reducing operational overhead and risk.
Adaptive Autovacuum
Automatically reclaims space from deleted rows to prevent table bloat and performance degradation.
The Google Cloud Database Spectrum
AlloyDB fills a critical role between the general-purpose Cloud SQL and the globally-distributed Cloud Spanner, offering a 100% PostgreSQL-compatible path for the most demanding regional workloads.
Cloud SQL
Best for general-purpose workloads, dev/test, and multi-engine needs (MySQL, SQL Server).
AlloyDB (The Sweet Spot)
Best for mission-critical regional applications, HTAP, and AI workloads demanding peak performance and 100% PostgreSQL compatibility.
Cloud Spanner
Best for global applications requiring horizontal write scaling and strong consistency across continents.
The Future is Intelligent & Agentic
AlloyDB is being positioned as the premier data foundation for enterprise generative AI, with best-in-class vector search and deep integration with Vertex AI.
ScaNN Index
Google's Battle-Tested Vector Search
The same technology powering Google Search and YouTube, integrated into PostgreSQL.
4x Faster
Vector Queries
Delivers significant performance advantages for Retrieval-Augmented Generation (RAG).