---
title: "TrueClock-Synchronized Globally-Distributed Database | Distributed Systems Architecture Canon"
description: "Globally distributed relational database architecture providing External Consistency (strict serializability) across multiple continents using atomic clocks and Multi-Paxos consensus."
image: "https://tinycto.tv/assets/distributed-systems/distributed_systems_architectures_og.jpg"
canonicalUrl: "https://tinycto.tv/distributed-systems/architectures/spanner-trueclock-distributed-sql"
locale: "en"
---

# TrueClock-Synchronized Globally-Distributed Database (`arch-spanner-trueclock-distributed-sql`)

> **Architectural Pillar**: CONSENSUS_STATE | **Archetype**: CONSENSUS_STATE_REPLICATION
> **PACELC**: PC/EC | **Consensus Protocol**: Multi-Paxos

Globally distributed relational database architecture providing External Consistency (strict serializability) across multiple continents using atomic clocks and Multi-Paxos consensus.

### 3 Maturity Target Configurations

#### 1. Initial Target: 8,000 trans/sec

- **Guarantees**: Serializable Snapshot Isolation (Single Region)
- **Infrastructure Topology**: 3 nodes in 1 cloud region across 3 availability zones.
- **Operational Trade-Off**: Transaction restarts under high contention on the same range.

#### 2. Scaled Target: 65,000 trans/sec

- **Guarantees**: Strict Serializability across Multi-Region Cloud
- **Infrastructure Topology**: 9 nodes across 3 cloud regions (e.g. Ireland, Frankfurt, London).
- **Operational Trade-Off**: Cross-region consensus round-trip latency on write operations.

#### 3. Ultra-Scale Target: 500,000 trans/sec

- **Guarantees**: Global External Consistency with TrueClock Hardware Reference
- **Infrastructure Topology**: Multi-region Spanner instance spanning Americas, EMEA, and APAC.
- **Operational Trade-Off**: Substantial managed service cloud cost and strict lockwait ceilings.

### Handled Failure Modes

- `DS-FAIL-07: Clock Skew Ordering`
- `DS-FAIL-09: Phantom Reads Write Skew`
- `DS-FAIL-01: Split-Brain Partitioning`


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