pgserve

Embedded PostgreSQL Server with TRUE Concurrent Connections

Zero config, auto-provision databases, unlimited concurrent connections. Just works.

Quick Start • Features • CLI • API • Performance

Quick Start

npx pgserve

Connect from any PostgreSQL client — databases auto-create on first connection:

psql postgresql://localhost:8432/myapp

Features

Real PostgreSQL 18	Native binaries, not WASM — full compatibility, extensions support
Unlimited Concurrency	Native PostgreSQL process forking — no connection locks
Zero Config	Just run pgserve, connect to any database name
Auto-Provision	Databases created automatically on first connection
Memory Mode	Fast and ephemeral for development (default)
RAM Mode	Use --ram for /dev/shm storage (Linux, 2x faster)
Persistent Mode	Use --data ./path for durable storage
Async Replication	Sync to real PostgreSQL with minimal overhead
pgvector Built-in	Use --pgvector for auto-enabled vector similarity search
Cross-Platform	Linux x64, macOS ARM64/x64, Windows x64
Any Client Works	psql, node-postgres, Prisma, Drizzle, TypeORM

Installation

# Zero install (recommended)
npx pgserve

# Global install
npm install -g pgserve

# Project dependency
npm install pgserve

PostgreSQL binaries are automatically downloaded on first run (~100MB).

Windows

Download pgserve-windows-x64.exe from GitHub Releases.

Double-click to run, or use CLI:

pgserve-windows-x64.exe --port 5432
pgserve-windows-x64.exe --data C:\pgserve-data

CLI Reference

pgserve [options]

Options:
  --port <number>       PostgreSQL port (default: 8432)
  --data <path>         Data directory for persistence (default: in-memory)
  --ram                 Use RAM storage via /dev/shm (Linux only, fastest)
  --host <host>         Host to bind to (default: 127.0.0.1)
  --log <level>         Log level: error, warn, info, debug (default: info)
  --cluster             Force cluster mode (auto-enabled on multi-core)
  --no-cluster          Force single-process mode
  --workers <n>         Number of worker processes (default: CPU cores)
  --no-provision        Disable auto-provisioning of databases
  --sync-to <url>       Sync to real PostgreSQL (async replication)
  --sync-databases <p>  Database patterns to sync (comma-separated)
  --pgvector            Auto-enable pgvector extension on new databases
  --max-connections <n> Max concurrent connections (default: 1000)
  --help                Show help message

Examples

# Development (memory mode, auto-clusters on multi-core)
pgserve

# RAM mode (Linux only, 2x faster)
pgserve --ram

# Persistent storage
pgserve --data /var/lib/pgserve

# Custom port
pgserve --port 5433

# Enable pgvector for AI/RAG applications
pgserve --pgvector

# RAM mode + pgvector (fastest for AI workloads)
pgserve --ram --pgvector

# Sync to production PostgreSQL
pgserve --sync-to "postgresql://user:pass@db.example.com:5432/prod"

API

import { startMultiTenantServer } from 'pgserve';

const server = await startMultiTenantServer({
  port: 8432,
  host: '127.0.0.1',
  baseDir: null,        // null = memory mode
  logLevel: 'info',
  autoProvision: true,
  enablePgvector: true, // Auto-enable pgvector on new databases
  syncTo: null,         // Optional: PostgreSQL URL for replication
  syncDatabases: null   // Optional: patterns like "myapp,tenant_*"
});

// Get stats
console.log(server.getStats());

// Graceful shutdown
await server.stop();

Framework Integration

node-postgres

import pg from 'pg';

const client = new pg.Client({
  connectionString: 'postgresql://localhost:8432/myapp'
});

await client.connect();
await client.query('CREATE TABLE users (id SERIAL, name TEXT)');
await client.query("INSERT INTO users (name) VALUES ('Alice')");
const result = await client.query('SELECT * FROM users');
console.log(result.rows);
await client.end();

Prisma

// prisma/schema.prisma
datasource db {
  provider = "postgresql"
  url      = env("DATABASE_URL")
}

# .env
DATABASE_URL="postgresql://localhost:8432/myapp"

# Run migrations
npx prisma migrate dev

Drizzle

import { drizzle } from 'drizzle-orm/node-postgres';
import { Pool } from 'pg';

const pool = new Pool({
  connectionString: 'postgresql://localhost:8432/myapp'
});

const db = drizzle(pool);
const users = await db.select().from(usersTable);

Async Replication

Sync ephemeral pgserve data to a real PostgreSQL database. Uses native logical replication for zero performance impact on the hot path.

# Sync all databases
pgserve --sync-to "postgresql://user:pass@db.example.com:5432/mydb"

# Sync specific databases (supports wildcards)
pgserve --sync-to "postgresql://..." --sync-databases "myapp,tenant_*"

Replication is handled by PostgreSQL's WAL writer process, completely off the runtime event loop. Sync failures don't affect main server operation.

pgvector (Vector Search)

pgvector is built-in — no separate installation required. Just enable it:

# Auto-enable pgvector on all new databases
pgserve --pgvector

# Combined with RAM mode for fastest vector operations
pgserve --ram --pgvector

When --pgvector is enabled, every new database automatically has the vector extension installed. No SQL setup required.

Using pgvector

-- Create table with vector column (1536 = OpenAI embedding size)
CREATE TABLE documents (id SERIAL, content TEXT, embedding vector(1536));

-- Insert with embedding
INSERT INTO documents (content, embedding) VALUES ('Hello', '[0.1, 0.2, ...]');

-- k-NN similarity search (L2 distance)
SELECT content FROM documents ORDER BY embedding <-> $1 LIMIT 10;

See pgvector documentation for full API reference.

Without --pgvector flag

If you don't use --pgvector, you can still enable pgvector manually per database:

CREATE EXTENSION IF NOT EXISTS vector;

pgvector 0.8.1 is bundled with the PostgreSQL binaries. Supports L2 distance (<->), inner product (<#>), and cosine distance (<=>).

Performance

CRUD Benchmarks

Scenario	SQLite	PGlite	PostgreSQL	pgserve	pgserve --ram
Concurrent Writes (10 agents)	91 qps	204 qps	1,667 qps	2,273 qps	4,167 qps 🏆
Mixed Workload	383 qps	484 qps	507 qps	1,133 qps	2,109 qps 🏆
Write Lock (50 writers)	111 qps	228 qps	2,857 qps	3,030 qps	4,348 qps 🏆

Vector Benchmarks (pgvector)

Metric	PGlite	PostgreSQL	pgserve	pgserve --ram
Vector INSERT (1000 × 1536-dim)	152/sec	392/sec	387/sec	1,082/sec 🏆
k-NN Search (k=10, 10k corpus)	22 qps	33 qps	31 qps	30 qps
Recall@10	100%	100%	100%	100%

Why pgserve wins on writes: RAM mode uses /dev/shm (tmpfs), eliminating fsync latency. Vector search is CPU-bound, so RAM mode shows minimal benefit there.

Final Score

Engine	CRUD QPS	Vec QPS	Recall	P50	P99	Score
SQLite	195	N/A	N/A	6.3ms	17.3ms	117
PGlite	305	65	100%	3.3ms	7.0ms	209
PostgreSQL	1,677	152	100%	6.0ms	19.0ms	1,067
pgserve	2,145	149	100%	5.3ms	13.0ms	1,347
pgserve --ram	3,541	381	100%	3.3ms	10.7ms	2,277 🏆

Methodology: Recall@k measured against brute-force ground truth (industry standard). PostgreSQL baseline is Docker pgvector/pgvector:pg18. RAM mode available on Linux and WSL2.

Run benchmarks yourself: bun tests/benchmarks/runner.js --include-vector

Use Cases

Development & Testing Local Development — PostgreSQL without Docker Integration Testing — Real PostgreSQL, not mocks CI/CD Pipelines — Fresh databases per test run E2E Testing — Isolated database for Playwright/Cypress	AI & Agents AI Agent Memory — Isolated, concurrent-safe database LLM Tool Use — Give AI models a real PostgreSQL RAG Applications — Store embeddings with pgvector
Multi-Tenant & SaaS Tenant Isolation — Auto-provision per tenant Demo Environments — Instant sandboxed PostgreSQL Microservices Dev — Each service gets its own DB	Edge & Embedded IoT Devices — Full PostgreSQL on Raspberry Pi Desktop Apps — Electron with embedded PostgreSQL Offline-First — Local DB that syncs when online

Requirements

• Runtime: Node.js >= 18 (npm/npx)
• Platform: Linux x64, macOS ARM64/x64, Windows x64

Development

Contributors: This project uses Bun internally for development:

# Install dependencies
bun install

# Run tests
bun test

# Run benchmarks
bun tests/benchmarks/runner.js

# Lint
bun run lint

Contributing

Contributions welcome! Fork the repo, create a feature branch, add tests, and submit a PR.

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MIT License — Copyright (c) 2025 Namastex Labs

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