MCP PostgreSQL Operations Server

A professional MCP server for PostgreSQL database server operations, monitoring, and management. Most features work independently, but advanced performance analysis capabilities are available when the pg_stat_statements and (optionally) pg_stat_monitor extensions are installed.

Features

• ✅ Version Compatibility: Transparent PostgreSQL version support (12-17) - automatically detects your PostgreSQL version and adapts functionality accordingly with zero configuration

• ✅ PostgreSQL Monitoring: Performance analysis based on pg_stat_statements and pg_stat_monitor with full backward compatibility

• ✅ Structure Exploration: Database, table, and user listing with detailed schema information

• ✅ Schema Analysis: Detailed table structure with columns, constraints, indexes, and relationships

• ✅ Performance Analysis: Slow query identification and index usage analysis with version-aware query optimization

• ✅ Capacity Management: Database and table size analysis

• ✅ Bloat Analysis: Table bloat monitoring and dead tuple analysis with maintenance recommendations

• ✅ VACUUM/Autovacuum Analysis: Comprehensive maintenance operation monitoring, effectiveness analysis, and real-time status tracking

• ✅ Configuration Retrieval: PostgreSQL configuration parameter verification

• ✅ Database Performance Statistics: Comprehensive transaction, I/O, and buffer cache analysis

• ✅ I/O Performance Monitoring: Version-aware I/O statistics (comprehensive on PG16+, basic on PG12-15)

• ✅ Background Process Monitoring: Version-aware checkpoint and background writer analysis (split on PG15+)

• ✅ Table Statistics Monitoring: Version-aware comprehensive table usage and maintenance statistics (enhanced vacuum tracking on PG13+)

• ✅ Replication Monitoring: Standby server conflict detection and replication lag analysis with version-compatible WAL status tracking

• ✅ Function Performance Analysis: User-defined function execution statistics

• ✅ Query Performance Analysis: Version-compatible pg_stat_statements integration (PG12: total_time mapping, PG13+: native columns)

• ✅ Safe Read-Only: All operations are read-only and safe

• 🛠️ Easy Customization: Simple and clean codebase makes it very easy to add new tools or customize existing ones

Tool Usage Examples

📸 More Examples with Screenshots →

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⭐ Quickstart (5 minutes)

Note: The postgresql container included in docker-compose.yml is intended for quickstart testing purposes only. You can connect to your own PostgreSQL instance by adjusting the environment variables as needed.

If you want to use your own PostgreSQL instance instead of the built-in test container:

• Update the target PostgreSQL connection information in your .env file (see POSTGRES_HOST, POSTGRES_PORT, POSTGRES_USER, POSTGRES_PASSWORD, POSTGRES_DB).
• In docker-compose.yml, comment out (disable) the postgres and postgres-init-extensions containers to avoid starting the built-in test database.

1. Environment Setup

Note: While superuser privileges provide access to all databases and system information, the MCP server also works with regular user permissions for basic monitoring tasks.

git clone https://github.com/call518/MCP-PostgreSQL-Ops.git
cd MCP-PostgreSQL-Ops

### Check and modify .env file
cp .env.example .env

### No need to modify defaults, but if using your own PostgreSQL server, edit below:
POSTGRES_HOST=host.docker.internal
POSTGRES_PORT=15432
POSTGRES_USER=postgres
POSTGRES_PASSWORD=changeme!@34
POSTGRES_DB=ecommerce # Default connection DB. Superusers can access all DBs.

2. Start Demo Containers

# Start all containers including built-in PostgreSQL for testing
docker-compose up -d

# Alternative: If using your own PostgreSQL instance
# Comment out postgres and postgres-init-extensions services in docker-compose.yml
# Then use the custom configuration:
# docker-compose -f docker-compose.custom-db.yml up -d

3. Access to OpenWebUI

http://localhost:3003/

• The list of MCP tool features provided by swagger can be found in the MCPO API Docs URL.
  • e.g: http://localhost:8003/docs

4. Registering the Tool in OpenWebUI

1. logging in to OpenWebUI with an admin account
2. go to "Settings" → "Tools" from the top menu.
3. Enter the postgresql-ops Tool address (e.g., http://localhost:8003/postgresql-ops) to connect MCP Tools.
4. Setup Ollama or OpenAI.

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Tool Compatibility Matrix

Automatic Adaptation: All tools work transparently across supported versions - no configuration needed!

🟢 Extension-Independent Tools (No Extensions Required)

Tool Name	Extensions Required	PG 12	PG 13	PG 14	PG 15	PG 16	PG 17	System Views/Tables Used
get_server_info	❌ None	✅	✅	✅	✅	✅	✅	version(), pg_extension
get_active_connections	❌ None	✅	✅	✅	✅	✅	✅	pg_stat_activity
get_postgresql_config	❌ None	✅	✅	✅	✅	✅	✅	pg_settings
get_database_list	❌ None	✅	✅	✅	✅	✅	✅	pg_database
get_table_list	❌ None	✅	✅	✅	✅	✅	✅	information_schema.tables
get_table_schema_info	❌ None	✅	✅	✅	✅	✅	✅	information_schema.*, pg_indexes
get_database_schema_info	❌ None	✅	✅	✅	✅	✅	✅	pg_namespace, pg_class, pg_proc
get_table_relationships	❌ None	✅	✅	✅	✅	✅	✅	information_schema.* (constraints)
get_user_list	❌ None	✅	✅	✅	✅	✅	✅	pg_user, pg_roles
get_index_usage_stats	❌ None	✅	✅	✅	✅	✅	✅	pg_stat_user_indexes
get_database_size_info	❌ None	✅	✅	✅	✅	✅	✅	pg_database_size()
get_table_size_info	❌ None	✅	✅	✅	✅	✅	✅	pg_total_relation_size()
get_vacuum_analyze_stats	❌ None	✅	✅	✅	✅	✅	✅	pg_stat_user_tables
get_current_database_info	❌ None	✅	✅	✅	✅	✅	✅	pg_database, current_database()
get_table_bloat_analysis	❌ None	✅	✅	✅	✅	✅	✅	pg_stat_user_tables
get_database_bloat_overview	❌ None	✅	✅	✅	✅	✅	✅	pg_stat_user_tables
get_autovacuum_status	❌ None	✅	✅	✅	✅	✅	✅	pg_stat_user_tables
get_autovacuum_activity	❌ None	✅	✅	✅	✅	✅	✅	pg_stat_user_tables
get_running_vacuum_operations	❌ None	✅	✅	✅	✅	✅	✅	pg_stat_activity
get_vacuum_effectiveness_analysis	❌ None	✅	✅	✅	✅	✅	✅	pg_stat_user_tables
get_table_bloat_analysis	❌ None	✅	✅	✅	✅	✅	✅	pg_stat_user_tables
get_database_bloat_overview	❌ None	✅	✅	✅	✅	✅	✅	pg_stat_user_tables
get_lock_monitoring	❌ None	✅	✅	✅	✅	✅	✅	pg_locks, pg_stat_activity
get_wal_status	❌ None	✅	✅	✅	✅	✅	✅	pg_current_wal_lsn()
get_database_stats	❌ None	✅	✅	✅	✅	✅	✅	pg_stat_database
get_table_io_stats	❌ None	✅	✅	✅	✅	✅	✅	pg_statio_user_tables
get_index_io_stats	❌ None	✅	✅	✅	✅	✅	✅	pg_statio_user_indexes
get_database_conflicts_stats	❌ None	✅	✅	✅	✅	✅	✅	pg_stat_database_conflicts

🚀 Version-Aware Tools (Auto-Adapting)

Tool Name	Extensions Required	PG 12	PG 13	PG 14	PG 15	PG 16	PG 17	Special Features
get_io_stats	❌ None	✅ Basic	✅ Basic	✅ Basic	✅ Basic	✅ Enhanced	✅ Enhanced	PG16+: pg_stat_io support
get_bgwriter_stats	❌ None	✅	✅	✅	✅ Special	✅	✅	PG15: Separate checkpointer stats
get_replication_status	❌ None	✅ Compatible	✅ Enhanced	✅ Enhanced	✅ Enhanced	✅ Enhanced	✅ Enhanced	PG13+: wal_status, safe_wal_size; PG16+: enhanced WAL receiver
get_all_tables_stats	❌ None	✅ Compatible	✅ Enhanced	✅ Enhanced	✅ Enhanced	✅ Enhanced	✅ Enhanced	PG13+: n_ins_since_vacuum tracking for vacuum maintenance optimization
get_user_functions_stats	⚙️ Config Required	✅	✅	✅	✅	✅	✅	Requires track_functions=pl

🟡 Extension-Dependent Tools (Extensions Required)

Tool Name	Required Extension	PG 12	PG 13	PG 14	PG 15	PG 16	PG 17	Notes
get_pg_stat_statements_top_queries	pg_stat_statements	✅ Compatible	✅ Enhanced	✅ Enhanced	✅ Enhanced	✅ Enhanced	✅ Enhanced	PG12: total_time → total_exec_time; PG13+: native total_exec_time
get_pg_stat_monitor_recent_queries	pg_stat_monitor	✅ Compatible	✅ Enhanced	✅ Enhanced	✅ Enhanced	✅ Enhanced	✅ Enhanced	PG12: total_time → total_exec_time; PG13+: native total_exec_time

📋 PostgreSQL 18 Support: PostgreSQL 18 is currently in beta phase and not yet supported by Percona Distribution PostgreSQL. Support will be added once PostgreSQL 18 reaches stable release and distribution support becomes available.

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Usage Examples

Claude Desktop Integration

(Recommended) Add to your Claude Desktop configuration file:

{
  "mcpServers": {
    "postgresql-ops": {
      "command": "uvx",
      "args": ["--python", "3.11", "mcp-postgresql-ops"],
      "env": {
        "POSTGRES_HOST": "127.0.0.1",
        "POSTGRES_PORT": "5432",
        "POSTGRES_USER": "postgres",
        "POSTGRES_PASSWORD": "passwd",
        "POSTGRES_DB": "testdb"
      }
    }
  }
}

"Show PostgreSQL configuration parameter for shared_buffers."

"Show all active connections in a clear and readable html table format."

"Show all relationships for customers table in ecommerce database as a Mermaid diagram."

(Optional) Run with Local Source:

{
  "mcpServers": {
    "postgresql-ops": {
      "command": "uv",
      "args": ["run", "python", "-m", "src.mcp_postgresql_ops.mcp_main"],
      "cwd": "/path/to/MCP-PostgreSQL-Ops",
      "env": {
        "POSTGRES_HOST": "127.0.0.1",
        "POSTGRES_PORT": "5432",
        "POSTGRES_USER": "postgres",
        "POSTGRES_PASSWORD": "passwd",
        "POSTGRES_DB": "testdb"
      }
    }
  }
}

Command Line Usage

/w Pypi and uvx (Recommended)

# Stdio mode
uvx --python 3.11 mcp-postgresql-ops \
  --type stdio

# HTTP mode
uvx --python 3.11 mcp-postgresql-ops
  --type streamable-http \
  --host 127.0.0.1 \
  --port 8080 \
  --log-level DEBUG

/w Local Source

# Stdio mode
PYTHONPATH=/path/to/MCP-PostgreSQL-Ops
python -m src.mcp_postgresql_ops.mcp_main \
  --type stdio

# HTTP mode
PYTHONPATH=/path/to/MCP-PostgreSQL-Ops
python -m src.mcp_postgresql_ops.mcp_main \
  --type streamable-http \
  --host 127.0.0.1 \
  --port 8080 \
  --log-level DEBUG

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Environment Variables

Variable	Description	Default	Project Default
PYTHONPATH	Python module search path for MCP server imports	-	/app/src
MCP_LOG_LEVEL	Server logging verbosity (DEBUG, INFO, WARNING, ERROR)	INFO	INFO
FASTMCP_TYPE	MCP transport protocol (stdio for CLI, streamable-http for web)	stdio	streamable-http
FASTMCP_HOST	HTTP server bind address (0.0.0.0 for all interfaces)	127.0.0.1	0.0.0.0
FASTMCP_PORT	HTTP server port for MCP communication	8080	8080
PGSQL_VERSION	PostgreSQL major version for Docker image selection	17	17
POSTGRES_HOST	PostgreSQL server hostname or IP address	127.0.0.1	host.docker.internal
POSTGRES_PORT	PostgreSQL server port number	5432	15432
POSTGRES_USER	PostgreSQL connection username (needs read permissions)	postgres	postgres
POSTGRES_PASSWORD	PostgreSQL user password (supports special characters)	changeme!@34	changeme!@34
POSTGRES_DB	Default database name for connections	testdb	testdb
POSTGRES_MAX_CONNECTIONS	PostgreSQL max_connections configuration parameter	200	200
DOCKER_EXTERNAL_PORT_OPENWEBUI	Host port mapping for Open WebUI container	8080	3003
DOCKER_EXTERNAL_PORT_MCP_SERVER	Host port mapping for MCP server container	8080	18003
DOCKER_EXTERNAL_PORT_MCPO_PROXY	Host port mapping for MCPO proxy container	8000	8003

Note: POSTGRES_DB serves as the default target database for operations when no specific database is specified. In Docker environments, if set to a non-default name, this database will be automatically created during initial PostgreSQL startup.

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Prerequisites

Required PostgreSQL Extensions

For more details, see the ## Tool Compatibility Matrix

Note: Most MCP tools work without any PostgreSQL extensions. section below. Some advanced performance analysis tools require the following extensions:

-- Query performance statistics (required only for get_pg_stat_statements_top_queries)
CREATE EXTENSION IF NOT EXISTS pg_stat_statements;

-- Advanced monitoring (optional, used by get_pg_stat_monitor_recent_queries)
CREATE EXTENSION IF NOT EXISTS pg_stat_monitor;

Quick Setup: For new PostgreSQL installations, add to postgresql.conf:

shared_preload_libraries = 'pg_stat_statements'

Then restart PostgreSQL and run the CREATE EXTENSION commands above.

• pg_stat_statements is required only for slow query analysis tools.
• pg_stat_monitor is optional and used for real-time query monitoring.
• All other tools work without these extensions.

Minimum Requirements

• PostgreSQL 12+ (tested with PostgreSQL 17)
• Python 3.11
• Network access to PostgreSQL server
• Read permissions on system catalogs

Required PostgreSQL Configuration

⚠️ Statistics Collection Settings: Some MCP tools require specific PostgreSQL configuration parameters to collect statistics. Choose one of the following configuration methods:

Tools affected by these settings:

• get_user_functions_stats: Requires track_functions = pl or track_functions = all
• get_table_io_stats & get_index_io_stats: More accurate timing with track_io_timing = on
• get_database_stats: Enhanced I/O timing with track_io_timing = on

Verification: After applying any method, verify the settings:

SELECT name, setting, context FROM pg_settings WHERE name IN ('track_activities', 'track_counts', 'track_io_timing', 'track_functions') ORDER BY name;

       name       | setting |  context  
------------------+---------+-----------
 track_activities | on      | superuser
 track_counts     | on      | superuser
 track_functions  | pl      | superuser
 track_io_timing  | on      | superuser
(4 rows)

Method 1: postgresql.conf (Recommended for Self-Managed PostgreSQL)

Add the following to your postgresql.conf:

# Basic statistics collection (usually enabled by default)
track_activities = on
track_counts = on

# Required for function statistics tools
track_functions = pl    # Enables PL/pgSQL function statistics collection

# Optional but recommended for accurate I/O timing
track_io_timing = on    # Enables I/O timing statistics collection

Then restart PostgreSQL server.

Method 2: PostgreSQL Startup Parameters

For Docker or command-line PostgreSQL startup:

# Docker example
docker run -d \
  -e POSTGRES_PASSWORD=mypassword \
  postgres:17 \
  -c track_activities=on \
  -c track_counts=on \
  -c track_functions=pl \
  -c track_io_timing=on

# Direct postgres command
postgres -D /data \
  -c track_activities=on \
  -c track_counts=on \
  -c track_functions=pl \
  -c track_io_timing=on

Method 3: Dynamic Configuration (AWS RDS, Azure, GCP, Managed Services)

For managed PostgreSQL services where you cannot modify postgresql.conf, use SQL commands to change settings dynamically:

-- Enable basic statistics collection (usually enabled by default)
ALTER SYSTEM SET track_activities = 'on';
ALTER SYSTEM SET track_counts = 'on';

-- Enable function statistics collection (requires superuser privileges)
ALTER SYSTEM SET track_functions = 'pl';

-- Enable I/O timing statistics (optional but recommended)
ALTER SYSTEM SET track_io_timing = 'on';

-- Reload configuration without restart (run separately)
SELECT pg_reload_conf();

Alternative for session-level testing:

-- Set for current session only (temporary)
SET track_activities = 'on';
SET track_counts = 'on';
SET track_functions = 'pl';
SET track_io_timing = 'on';

Note: When using command-line tools, run each SQL statement separately to avoid transaction block errors.

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RDS/Aurora Compatibility

• This server is read-only and works with regular roles on RDS/Aurora. For advanced analysis enable pg_stat_statements; pg_stat_monitor is not available on managed engines.
• On RDS/Aurora, prefer DB Parameter Group over ALTER SYSTEM for persistent settings.

  -- Verify preload setting
  SHOW shared_preload_libraries;
  
  -- Enable extension in target DB
  CREATE EXTENSION IF NOT EXISTS pg_stat_statements;
  
  -- Recommended visibility for monitoring
  GRANT pg_read_all_stats TO <app_user>;

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Example Queries

🟢 Extension-Independent Tools (Always Available)

• get_server_info
  • "Show PostgreSQL server version and extension status."
  • "Check if pg_stat_statements is installed."
• get_active_connections
  • "Show all active connections."
  • "List current sessions with database and user."
• get_postgresql_config
  • "Show all PostgreSQL configuration parameters."
  • "Find all memory-related configuration settings."
• get_database_list
  • "List all databases and their sizes."
  • "Show database list with owner information."
• get_table_list
  • "List all tables in the ecommerce database."
  • "Show table sizes in the public schema."
• get_table_schema_info
  • "Show detailed schema information for the customers table in ecommerce database."
  • "Get column details and constraints for products table in ecommerce database."
  • "Analyze table structure with indexes and foreign keys for orders table in sales schema of ecommerce database."
  • "Show schema overview for all tables in public schema of inventory database."
  • 📋 Features: Column types, constraints, indexes, foreign keys, table metadata
  • ⚠️ Required: database_name parameter must be specified
• get_database_schema_info
  • "Show all schemas in ecommerce database with their contents."
  • "Get detailed information about sales schema in ecommerce database."
  • "Analyze schema structure and permissions for inventory database."
  • "Show schema overview with table counts and sizes for hr_system database."
  • 📋 Features: Schema owners, permissions, object counts, sizes, contents
  • ⚠️ Required: database_name parameter must be specified
• get_table_relationships
  • "Show all relationships for customers table in ecommerce database."
  • "Analyze foreign key relationships for orders table in sales schema of ecommerce database."
  • "Get database-wide relationship overview for ecommerce database."
  • "Find all tables that reference products table in ecommerce database."
  • "Show cross-schema relationships in inventory database."
  • 📋 Features: Foreign key relationships (inbound/outbound), cross-schema dependencies, constraint details
  • ⚠️ Required: database_name parameter must be specified
  • 💡 Usage: Leave table_name empty for database-wide relationship analysis
• get_user_list
  • "List all database users and their roles."
  • "Show user permissions for a specific database."
• get_index_usage_stats
  • "Analyze index usage efficiency."
  • "Find unused indexes in the current database."
• get_database_size_info
  • "Show database capacity analysis."
  • "Find the largest databases by size."
• get_table_size_info
  • "Show table and index size analysis."
  • "Find largest tables in a specific schema."
• get_vacuum_analyze_stats
  • "Show recent VACUUM and ANALYZE operations."
  • "List tables needing VACUUM."
• get_current_database_info
  • "What database am I connected to?"
  • "Show current database information and connection details."
  • "Display database encoding, collation, and size information."
  • 📋 Features: Database name, encoding, collation, size, connection limits
  • 🔧 PostgreSQL 12-17: Fully compatible, no extensions required
• get_table_bloat_analysis
  • "Analyze table bloat in the current database."
  • "Show dead tuple ratios and bloat estimates for user_logs table pattern."
  • "Find tables with high bloat that need VACUUM maintenance."
  • "Analyze bloat in specific schema with minimum 100 dead tuples."
  • 📋 Features: Dead tuple ratios, bloat size estimates, VACUUM recommendations, pattern filtering
  • 🔧 PostgreSQL 12-17: Fully compatible, no extensions required
  • 💡 Usage: Extension-Independent approach using pg_stat_user_tables
• get_database_bloat_overview
  • "Show database-wide bloat summary by schema."
  • "Get high-level view of storage efficiency across all schemas."
  • "Identify schemas requiring maintenance attention."
  • 📋 Features: Schema-level aggregation, total bloat estimates, maintenance status
  • 🔧 PostgreSQL 12-17: Fully compatible, no extensions required
• get_autovacuum_status
  • "Check autovacuum configuration and trigger conditions."
  • "Show tables needing immediate autovacuum attention."
  • "Analyze autovacuum threshold percentages for public schema."
  • "Find tables approaching autovacuum trigger points."
  • 📋 Features: Trigger threshold analysis, urgency classification, configuration status
  • 🔧 PostgreSQL 12-17: Fully compatible, no extensions required
  • 💡 Usage: Extension-Independent autovacuum monitoring using pg_stat_user_tables
• get_autovacuum_activity
  • "Show autovacuum activity patterns for the last 48 hours."
  • "Monitor autovacuum execution frequency and timing."
  • "Find tables with irregular autovacuum patterns."
  • "Analyze recent autovacuum and autoanalyze history."
  • 📋 Features: Activity patterns, execution frequency, timing analysis
  • 🔧 PostgreSQL 12-17: Fully compatible, no extensions required
  • 💡 Usage: Historical autovacuum pattern analysis
• get_running_vacuum_operations
  • "Show currently running VACUUM and ANALYZE operations."
  • "Monitor active maintenance operations and their progress."
  • "Check if any VACUUM operations are blocking queries."
  • "Find long-running maintenance operations."
  • 📋 Features: Real-time operation status, elapsed time, impact level, process details
  • 🔧 PostgreSQL 12-17: Fully compatible, no extensions required
  • 💡 Usage: Real-time maintenance monitoring using pg_stat_activity
• get_vacuum_effectiveness_analysis
  • "Analyze VACUUM effectiveness and maintenance patterns."
  • "Compare manual VACUUM vs autovacuum efficiency."
  • "Find tables with suboptimal maintenance patterns."
  • "Check VACUUM frequency vs table activity ratios."
  • 📋 Features: Maintenance pattern analysis, effectiveness assessment, DML-to-VACUUM ratios
  • 🔧 PostgreSQL 12-17: Fully compatible, no extensions required
  • 💡 Usage: Strategic VACUUM analysis using existing statistics
• get_table_bloat_analysis
  • "Analyze table bloat in the public schema."
  • "Show tables with high dead tuple ratios in ecommerce database."
  • "Find tables requiring VACUUM maintenance."
  • "Check bloat for tables with more than 5000 dead tuples."
  • 📋 Features: Dead tuple ratios, estimated bloat size, VACUUM recommendations
  • ⚠️ Required: Specify database_name for cross-database analysis
• get_database_bloat_overview
  • "Show database-wide bloat summary by schema."
  • "Get bloat overview for inventory database."
  • "Identify schemas with highest bloat ratios."
  • "Database maintenance planning with bloat statistics."
  • 📋 Features: Schema-level aggregation, maintenance priorities, size recommendations
• get_lock_monitoring
  • "Show all current locks and blocked sessions."
  • "Show only blocked sessions with granted=false filter."
  • "Monitor locks by specific user with username filter."
  • "Check exclusive locks with mode filter."
• get_wal_status
  • "Show WAL status and archiving information."
  • "Monitor WAL generation and current LSN position."
• get_replication_status
  • "Check replication connections and lag status."
  • "Monitor replication slots and WAL receiver status."
• get_database_stats
  • "Show comprehensive database performance metrics."
  • "Analyze transaction commit ratios and I/O statistics."
  • "Monitor buffer cache hit ratios and temporary file usage."
• get_bgwriter_stats
  • "Analyze checkpoint performance and timing."
  • "Show me checkpoint performance."
  • "Show background writer efficiency statistics."
  • "Monitor buffer allocation and fsync patterns."
• get_user_functions_stats
  • "Analyze user-defined function performance."
  • "Show function call counts and execution times."
  • "Identify performance bottlenecks in custom functions."
  • ⚠️ Requires: track_functions = pl in postgresql.conf
• get_table_io_stats
  • "Analyze table I/O performance and buffer hit ratios."
  • "Identify tables with poor buffer cache performance."
  • "Monitor TOAST table I/O statistics."
  • 💡 Enhanced with: track_io_timing = on for accurate timing
• get_index_io_stats
  • "Show index I/O performance and buffer efficiency."
  • "Identify indexes causing excessive disk I/O."
  • "Monitor index cache-friendliness patterns."
  • 💡 Enhanced with: track_io_timing = on for accurate timing
• get_database_conflicts_stats
  • "Check replication conflicts on standby servers."
  • "Analyze conflict types and resolution statistics."
  • "Monitor standby server query cancellation patterns."
  • "Monitor WAL generation and current LSN position."
• get_replication_status
  • "Check replication connections and lag status."
  • "Monitor replication slots and WAL receiver status."

🚀 Version-Aware Tools (Auto-Adapting)

• get_io_stats (New!)
  • "Show comprehensive I/O statistics." (PostgreSQL 16+ provides detailed breakdown)
  • "Analyze I/O statistics."
  • "Analyze buffer cache efficiency and I/O timing."
  • "Monitor I/O patterns by backend type and context."
  • 📈 PG16+: Full pg_stat_io with timing, backend types, and contexts
  • 📊 PG12-15: Basic pg_statio_* fallback with buffer hit ratios
• get_bgwriter_stats (Enhanced!)
  • "Show background writer and checkpoint performance."
  • 📈 PG15: Separate checkpointer and bgwriter statistics (unique feature)
  • 📊 PG12-14, 16+: Combined bgwriter stats (includes checkpointer data)
• get_server_info (Enhanced!)
  • "Show server version and compatibility features."
  • "Check server compatibility."
  • "Check what MCP tools are available on this PostgreSQL version."
  • "Displays feature availability matrix and upgrade recommendations."
• get_all_tables_stats (Enhanced!)
  • "Show comprehensive statistics for all tables." (version-compatible for PG12-17)
  • "Include system tables with include_system=true parameter."
  • "Analyze table access patterns and maintenance needs."
  • 📈 PG13+: Tracks insertions since vacuum (n_ins_since_vacuum) for optimal maintenance scheduling
  • 📊 PG12: Compatible mode with NULL for unsupported columns

🟡 Extension-Dependent Tools

• get_pg_stat_statements_top_queries (Requires pg_stat_statements)
  • "Show top 10 slowest queries."
  • "Analyze slow queries in the inventory database."
  • 📈 Version-Compatible: PG12 uses total_time → total_exec_time mapping; PG13+ uses native columns
  • 💡 Cross-Version: Automatically adapts query structure for PostgreSQL 12-17 compatibility
• get_pg_stat_monitor_recent_queries (Optional, uses pg_stat_monitor)
  • "Show recent queries in real time."
  • "Monitor query activity for the last 5 minutes."
  • 📈 Version-Compatible: PG12 uses total_time → total_exec_time mapping; PG13+ uses native columns
  • 💡 Cross-Version: Automatically adapts query structure for PostgreSQL 12-17 compatibility

💡 Pro Tip: All tools support multi-database operations using the database_name parameter. This allows PostgreSQL superusers to analyze and monitor multiple databases from a single MCP server instance.

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Troubleshooting

Connection Issues

1. Check PostgreSQL server status
2. Verify connection parameters in .env file
3. Ensure network connectivity
4. Check user permissions

Extension Errors

1. Run get_server_info to check extension status
2. Install missing extensions:

   CREATE EXTENSION pg_stat_statements;
   CREATE EXTENSION pg_stat_monitor;

3. Restart PostgreSQL if needed

Configuration Issues

1. "No data found" for function statistics: Check track_functions setting

   SHOW track_functions;  -- Should be 'pl' or 'all'

   Quick fix for managed services (AWS RDS, etc.):

   ALTER SYSTEM SET track_functions = 'pl';
   SELECT pg_reload_conf();

2. Missing I/O timing data: Enable timing collection

   SHOW track_io_timing;  -- Should be 'on'

   Quick fix:

   ALTER SYSTEM SET track_io_timing = 'on';
   SELECT pg_reload_conf();

3. Apply configuration changes:

   • Self-managed: Add settings to postgresql.conf and restart server
   • Managed services: Use ALTER SYSTEM SET + SELECT pg_reload_conf()
   • Temporary testing: Use SET parameter = value for current session
   • Generate some database activity to populate statistics

Performance Issues

1. Use limit parameters to reduce result size
2. Run monitoring during off-peak hours
3. Check database load before running analysis

Version Compatibility Issues

For more details, see the ## Tool Compatibility Matrix

1. Run compatibility check first:

   # "Use get_server_info to check version and available features"

2. Understanding feature availability:

   • PostgreSQL 16-17: All features available
   • PostgreSQL 15+: Separate checkpointer stats
   • PostgreSQL 14+: Parallel query tracking
   • PostgreSQL 12-13: Core functionality only

3. If a tool shows "Not Available":

   • Feature requires newer PostgreSQL version
   • Tool will automatically use best available alternative
   • Consider upgrading PostgreSQL for enhanced monitoring

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Development

Testing & Development

# Test with MCP Inspector
./scripts/run-mcp-inspector-local.sh

# Direct execution for debugging
python -m src.mcp_postgresql_ops.mcp_main --log-level DEBUG

# Test version compatibility (requires different PostgreSQL versions)
# Modify POSTGRES_HOST in .env to point to different versions

# Run tests (if you add any)
uv run pytest

Version Compatibility Testing

The MCP server automatically adapts to PostgreSQL versions 12-17. To test across versions:

1. Set up test databases: Different PostgreSQL versions (12, 14, 15, 16, 17)
2. Run compatibility tests: Point to each version and verify tool behavior
3. Check feature detection: Ensure proper version detection and feature availability
4. Verify fallback behavior: Confirm graceful degradation on older versions

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Security Notes

• All tools are read-only - no data modification capabilities
• Sensitive information (passwords) are masked in outputs
• No direct SQL execution - only predefined queries
• Follows principle of least privilege

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Contributing

🤝 Got ideas? Found bugs? Want to add cool features?

We're always excited to welcome new contributors! Whether you're fixing a typo, adding a new monitoring tool, or improving documentation - every contribution makes this project better.

Ways to contribute:

• 🐛 Report issues or bugs
• 💡 Suggest new PostgreSQL monitoring features
• 📝 Improve documentation
• 🚀 Submit pull requests
• ⭐ Star the repo if you find it useful!

Pro tip: The codebase is designed to be super friendly for adding new tools. Check out the existing @mcp.tool() functions in mcp_main.py.

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Example: MCPO Swagger APIs

[MCPO Swagger URL] http://localhost:8003/postgresql-ops/docs

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License

Freely use, modify, and distribute under the MIT License.

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⭐ Other Projects

Other MCP servers by the same author:

• MCP-Ambari-API
• MCP-Airflow-API
• LogSentinelAI - LLB-Based Log Analyzer