PostgreSQL Multi-Schema MCP Server: Secure & Scalable Data Access

What is PostgreSQL Multi-Schema MCP Server: Secure & Scalable Data Access?

This server acts as a safeguarded bridge between PostgreSQL databases and large language models (LLMs), enabling secure read-only access across multiple schemas. Think of it like a bouncer for your database—strictly controlling which parts of your data LLMs can peek at, while keeping everything else locked behind velvet ropes.

How to Use PostgreSQL Multi-Schema MCP Server: Secure & Scalable Data Access?

Start by telling the server where your database lives and which schemas need exposure:

npx -y mcp-server-postgres-multi-schema postgresql://localhost/mydb public,analytics

For Claude Desktop users, drop this config into your JSON file like a secret recipe:

{
  "mcpServers": {
    "postgres": {
      "command": "npx",
      "args": ["-y", "mcp-server-postgres-multi-schema", "postgresql://localhost/mydb", "public,audit"]
    }
  }
}

Key Features of PostgreSQL Multi-Schema MCP Server: Secure & Scalable Data Access?

• Schemas on a Need-to-Know Basis: Specify exactly which schemas to expose via command-line—no accidental data exposure allowed.
• Schema Segregation: Strict firewall-style access ensures even if one schema is compromised, others stay untouched.
• Unified View, Compartmentalized Risks: LLMs see a seamless data surface while your underlying structures remain protected.
• Security by Omission: Automatically filters out sensitive system tables so your inner database workings stay hidden.

Use Cases for PostgreSQL Multi-Schema MCP Server

Perfect for scenarios where you want:

• Data exploration without granting full DB access
• Secure cross-schema analysis for compliance audits
• Multi-team collaboration with role-based data visibility
• Training models on sanitized production data

FAQ: PostgreSQL Multi-Schema MCP Server

Q: Does this handle write operations?

A: Absolutely not. We’re all about the “read-only” part of the job description. Data modification stays off-limits.

Q: Can I dynamically add schemas later?

A: Yep, just restart the server with updated schema lists—no database gymnastics required.

Q: Any performance hit?

A: Minimal. The server uses PostgreSQL’s native security features, so it’s as efficient as your DB admin’s coffee intake.

Q: License?

A: MIT-licensed—feel free to audit the code like a paranoid database admin.

PostgreSQL Multi-Schema MCP Server

A Model Context Protocol server that provides read-only access to PostgreSQL databases with enhanced multi-schema support. This server enables LLMs to inspect database schemas across multiple namespaces and execute read-only queries while maintaining schema isolation.

Key Features

• Multi-Schema Support : Explicitly specify which schemas to expose through command-line configuration
• Schema Isolation : Strict access control to only authorized schemas listed during server startup
• Cross-Schema Discovery : Unified view of tables across multiple schemas while maintaining schema boundaries
• Metadata Security : Filters system catalogs to only expose user-defined tables in specified schemas

Components

Tools

• query
  • Execute read-only SQL queries against the connected database
  • Input: sql (string): The SQL query to execute
  • All queries are executed within a READ ONLY transaction
  • Schema context maintained through search_path restriction

Resources

The server provides schema information for each table across authorized schemas:

• Table Schemas (postgres://<host>/<db_schema>/<table>/schema)
  • JSON schema information for each table
  • Includes column names, data types, and type modifiers
  • Automatically discovered from database metadata
  • Multi-schema support with explicit schema allow-list

Usage

The server requires a database URL and accepts a comma-separated list of schemas to expose:

npx -y mcp-server-postgres-multi-schema <database-url> [schemas]

• database-url : PostgreSQL connection string (e.g., postgresql://localhost/mydb)
• schemas : Comma-separated list of schemas to expose (defaults to 'public' if not specified)

Examples

# Connect with default public schema
npx -y mcp-server-postgres-multi-schema postgresql://localhost/mydb

# Connect with multiple schemas
npx -y mcp-server-postgres-multi-schema postgresql://localhost/mydb public,analytics,staging

Usage with Claude Desktop

Configure the "mcpServers" section in your claude_desktop_config.json:

NPX

{
  "mcpServers": {
    "postgres": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-server-postgres-multi-schema",
        "postgresql://localhost/mydb",
        "public,audit"
      ]
    }
  }
}

License

This multi-schema MCP server is licensed under the MIT License. You may use, modify, and distribute the software according to the terms in the LICENSE file.