Design Patterns MCP Server

{ "id": "database-sharding", "name": "Database Sharding", "category": "Data Access", "description": "Horizontal partitioning of data across multiple databases", "when_to_use": "Large datasets\nScalability requirements\nPerformance optimization", "benefits": "Horizontal scaling\nPerformance improvement\nLoad distribution", "drawbacks": "Complex queries\nData consistency\nOperational complexity", "use_cases": "Large-scale applications\nBig data systems\nGlobal applications", "complexity": "High", "tags": [ "data-access", "scaling", "partitioning" ], "examples": { "typescript": { "language": "typescript", "code": "// Database Sharding: horizontal partitioning\nclass ShardingStrategy {\n constructor(private shards: Database[]) {}\n \n getShard(key: string): Database {\n const hash = this.hash(key);\n const shardIndex = hash % this.shards.length;\n return this.shards[shardIndex];\n }\n \n private hash(key: string): number {\n let hash = 0;\n for (let i = 0; i < key.length; i++) {\n hash = ((hash << 5) - hash) + key.charCodeAt(i);\n }\n return Math.abs(hash);\n }\n}\n\nclass ShardedUserRepository {\n constructor(private sharding: ShardingStrategy) {}\n \n async findById(userId: string): Promise<User | null> {\n const shard = this.sharding.getShard(userId);\n const row = await shard.query('SELECT * FROM users WHERE id = $1', [userId]);\n return row ? this.mapToUser(row) : null;\n }\n \n async save(user: User): Promise<void> {\n const shard = this.sharding.getShard(user.id);\n await shard.query('INSERT INTO users (...) VALUES (...)', [user.id, user.email]);\n }\n \n private mapToUser(row: any): User {\n return { id: row.id, email: row.email };\n }\n}\n\nconst sharding = new ShardingStrategy([shard1, shard2, shard3]);\nconst repo = new ShardedUserRepository(sharding);" } } }