Oracle Database

A Model Context Protocol server that provides read-only access to Oracle Database. This server enables LLMs to inspect database schemas, execute and explain read-only queries.

Components

Tools

• orcl-query

  • Execute read-only SQL queries against the connected Oracle Database
  • Input: sql (string): The SQL query to execute
  • All queries are executed within a READ ONLY transaction

• orcl-explain

  • Explain plan SQL queries against the connected Oracle Database
  • Input: sql (string): The SQL query to execute
  • Requires GRANT SELECT_CATALOG_ROLE TO your_user;

• orcl-stats

  • Get statistics for a given table on current connected schema
  • Input: name (string): The table name
  • Table owner is equal to USER SQL function returning value

• orcl-connect

  • Reconnect using new credentials
  • Input: connectionString (string): SQLNet connect string for example host.docker.internal:1521/freepdb1
  • Input: user (string): Username for example scott
  • Input: password (string): Password, for example tiger

Example: orcl-connect host.docker.internal:1521/freepdb1 hr hr_2025

• orcl-awr
  • Automatic Workload Repository (AWR) with optional sql_id, requires SELECT_CATALOG_ROLE and grant execute on DBMS_WORKLOAD_REPOSITORY package
  • Input: sql_id (string): (optional) SQL id to get the AWR report for an specific query, if null full last generated AWR report

Resources

The server provides schema information for each table in the Oracle Database current connected user:

• Table Schemas (oracle://USER/<table>/schema)
  • JSON schema information for each table
  • Includes column names and data types
  • Automatically discovered from Oracle Database metadata

Change Log

See Change Log for the history of changes.

Demos

See Demos for usage examples with Claude Desktop, Docker AI, Gemini CLI, and Antigravity Code Editor.

Oracle AWR in action

See Oracle AWR in action for an example of an AWR report generated using the orcl-awr tool, followed by an analysis of the top SQL statements.

The Oracle server uses environment variables or the orcl-connect tool for secure credential management:

• ORACLE_USER: Oracle username (optional if using orcl-connect)
• ORACLE_PASSWORD: Oracle password (optional if using orcl-connect)

Connection String

The connection string should contain only the host, port, and service/SID information (without embedded credentials). Providing it as a command-line argument is optional. If omitted at startup, you must use the orcl-connect tool to establish a connection before using other functionality.

Supported connection string formats:

• host:port/service_name
• host:port:SID

Building

Docker:

docker build -t mochoa/mcp-oracle -f src/oracle/Dockerfile .

Usage with Claude Desktop

To use this server with the Claude Desktop app, add the following configuration to the "mcpServers" section of your claude_desktop_config.json:

Docker

• When running Docker on macOS, use host.docker.internal if the Oracle Database is running on the host network (e.g., localhost)
• Credentials are passed via environment variables ORACLE_USER and ORACLE_PASSWORD

{
  "mcpServers": {
    "oracle": {
      "command": "docker",
      "args": [
        "run", 
        "-i", 
        "--rm",
        "-e", "ORACLE_USER=myuser",
        "-e", "ORACLE_PASSWORD=mypassword",
        "mochoa/mcp-oracle",
        "host.docker.internal:1521/freepdb1"
      ]
    }
  }
}

Note: You can still provide the connection string as a final argument if you want to connect automatically on startup: "args": [..., "mochoa/mcp-oracle", "host.docker.internal:1521/freepdb1"].

Sources

As usual the code of this extension is at GitHub, feel free to suggest changes and make contributions, note that I am a beginner developer of React and TypeScript so contributions to make this UI better are welcome.

Compared to SQLcl MCP server

Using SQLcl Docker extension you could register a connection using:

docker exec --user sqlcl -ti mochoa_sqlcl-docker-extension-desktop-extension-service /opt/sqlcl/bin/sql -save hr_mcp -savepwd hr/[email protected]:1521/freepdb1   

after that using this registration:

{
  "mcpServers": {
    "sqlcl-mcp-server": {
      "type": "stdio",
      "command": "docker",
      "args": [
        "exec",
        "--user",
        "sqlcl",
        "-i",
        "mochoa_sqlcl-docker-extension-desktop-extension-service",
        "/opt/sqlcl/bin/sql",
        "-mcp"
      ]
    }
  }
}

Just replace above Demo prompts instead of "orcl-query" tool use "run-sql".

📜 License

This project is licensed under the Apache License, Version 2.0 for new contributions, with existing code under MIT - see the LICENSE file for details.