# PostgreSQL MCP Server Technical Documentation
## Architecture Overview
The PostgreSQL MCP Server is built on the Model Context Protocol (MCP) framework and provides database management capabilities through a set of specialized tools.
### Core Components
1. **MCP Server**
- Handles protocol communication
- Manages tool registration
- Processes requests/responses
- Implements error handling
2. **Database Interface**
- Connection management
- Query execution
- Transaction handling
- Result processing
3. **Analysis Engine**
- Configuration analysis
- Performance metrics
- Security auditing
- Recommendations generation
## Tool Specifications
### 1. analyze_database
#### Input Schema
```typescript
interface AnalyzeDatabaseInput {
connectionString: string;
analysisType?: "configuration" | "performance" | "security";
options?: {
timeout?: number;
depth?: "basic" | "detailed" | "comprehensive";
includeData?: boolean;
};
}
```
#### Output Schema
```typescript
interface AnalysisResult {
status: "success" | "error";
timestamp: string;
duration: number;
analysis: {
type: string;
metrics: Record<string, any>;
findings: Array<{
category: string;
level: "info" | "warning" | "critical";
message: string;
details: any;
}>;
recommendations: Array<{
priority: "low" | "medium" | "high";
description: string;
implementation: string;
impact: string;
}>;
};
error?: {
code: string;
message: string;
details: any;
};
}
```
### 2. debug_database
#### Input Schema
```typescript
interface DebugDatabaseInput {
connectionString: string;
issue: "connection" | "performance" | "locks" | "replication";
logLevel?: "info" | "debug" | "trace";
options?: {
timeout?: number;
maxResults?: number;
includeQueries?: boolean;
collectMetrics?: boolean;
};
}
```
#### Output Schema
```typescript
interface DebugResult {
status: "success" | "error";
timestamp: string;
duration: number;
debug: {
issue: string;
context: {
serverVersion: string;
currentConnections: number;
uptime: string;
};
findings: Array<{
type: string;
severity: "low" | "medium" | "high";
description: string;
evidence: any;
solution?: string;
}>;
metrics?: {
cpu: number;
memory: number;
io: {
read: number;
write: number;
};
connections: number;
};
queries?: Array<{
sql: string;
duration: number;
plan?: any;
stats?: any;
}>;
};
error?: {
code: string;
message: string;
details: any;
};
}
```
## Implementation Details
### Connection Management
```typescript
class ConnectionManager {
private pools: Map<string, Pool>;
private config: ConnectionConfig;
constructor(config: ConnectionConfig) {
this.pools = new Map();
this.config = config;
}
async getConnection(connectionString: string): Promise<PoolClient> {
// Implementation
}
async releaseConnection(client: PoolClient): Promise<void> {
// Implementation
}
private createPool(connectionString: string): Pool {
// Implementation
}
}
```
### Analysis Engine
```typescript
class AnalysisEngine {
private connection: ConnectionManager;
private metrics: MetricsCollector;
constructor(connection: ConnectionManager) {
this.connection = connection;
this.metrics = new MetricsCollector();
}
async analyzeConfiguration(): Promise<ConfigAnalysis> {
// Implementation
}
async analyzePerformance(): Promise<PerformanceAnalysis> {
// Implementation
}
async analyzeSecurity(): Promise<SecurityAnalysis> {
// Implementation
}
}
```
### Debug Engine
```typescript
class DebugEngine {
private connection: ConnectionManager;
private logger: Logger;
constructor(connection: ConnectionManager, logger: Logger) {
this.connection = connection;
this.logger = logger;
}
async debugConnection(): Promise<DebugResult> {
// Implementation
}
async debugPerformance(): Promise<DebugResult> {
// Implementation
}
async debugLocks(): Promise<DebugResult> {
// Implementation
}
async debugReplication(): Promise<DebugResult> {
// Implementation
}
}
```
## Error Handling
### Error Types
```typescript
enum ErrorCode {
CONNECTION_ERROR = "CONNECTION_ERROR",
AUTHENTICATION_ERROR = "AUTHENTICATION_ERROR",
PERMISSION_ERROR = "PERMISSION_ERROR",
TIMEOUT_ERROR = "TIMEOUT_ERROR",
VALIDATION_ERROR = "VALIDATION_ERROR",
INTERNAL_ERROR = "INTERNAL_ERROR"
}
interface McpError {
code: ErrorCode;
message: string;
details?: any;
cause?: Error;
}
```
### Error Handling Strategy
1. **Connection Errors**
- Retry with exponential backoff
- Pool connection management
- Timeout handling
- Circuit breaker implementation
2. **Query Errors**
- SQL error parsing
- Query timeout handling
- Transaction management
- Resource cleanup
3. **Analysis Errors**
- Partial result handling
- Metric collection failures
- Analysis timeout management
- Resource constraints
## Performance Considerations
1. **Connection Pooling**
- Pool size configuration
- Connection lifecycle
- Resource limits
- Idle timeout management
2. **Query Optimization**
- Prepared statements
- Query planning
- Result streaming
- Batch operations
3. **Resource Management**
- Memory usage
- CPU utilization
- I/O operations
- Network bandwidth
## Security Implementation
1. **Authentication**
- Connection string validation
- Credential management
- SSL/TLS configuration
- Role-based access
2. **Query Safety**
- SQL injection prevention
- Query sanitization
- Parameter binding
- Resource limits
3. **Audit Logging**
- Operation logging
- Access tracking
- Error logging
- Security events