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Database scaling & optimization

Indexing, connection pooling, read replicas, query tuning, and throughput-aware SQL.

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Database scaling & optimization medium

How to Mock a Cross-Shard Saga in Python

Simulate a distributed saga with compensating transactions across multiple database shards using a lightweight Python class that tracks executed steps and rolls them back in reverse on failure.

saga sharding distributed-systems
Python 
import json


class SagaState:
    def __init__(self, saga_id):
        self.saga_id = saga_id
        self.executed_steps = []
        self.compensations = []

    def execute_step(self, shard, step_name, operation):
        self.executed_steps.append((shard, step_name))
        print(f"[Saga {self.saga_id}] Executin…
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