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Database scaling & optimization

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

3 matches

How to Avoid SELECT * and Mock SQL Column Queries in Python

Mock a SQLite cursor to verify that queries specify explicit columns instead of using SELECT *.

import sqlite3
from unittest.mock import Mock, patch


def get_user_emails(connection):
    """Fetch only the required columns instead of SELECT *."""
    cursor = connection.cursor()
    cursor.execute("SELECT email FROM users")
    return [row[0] for row in cursor.fetchall()]


def test_get_user_emails_specific_colu…

13 0 Open

Database scaling & optimization medium

How to Explain SQLite Query Plans in Python

Build a Python function that runs EXPLAIN QUERY PLAN on SQLite in-memory tables and prints the optimizer's execution plan for any SELECT statement.

sqlite query-plan optimization

Python

import sqlite3

def explain_query(sql: str) -> str:
    """Return the SQLite query plan for the given SQL statement."""
    conn = sqlite3.connect(":memory:")
    cursor = conn.cursor()
    
    # Create sample data for a realistic plan
    cursor.execute("CREATE TABLE users (id INTEGER PRIMARY KEY, name TEXT)")
    c…

14 0 Open

Database scaling & optimization easy

Route SELECT Queries to Read Replicas in Python

A mock round-robin router that forwards SELECT queries to read replicas and sends writes to the primary.

database replication routing

Python

import random

class ReadReplicaRouter:
    """Round-robin router that sends SELECT queries to read replicas."""
    
    def __init__(self, replicas):
        self.replicas = replicas
        self.counter = 0
    
    def route(self, sql):
        if sql.strip().upper().startswith("SELECT"):
            replica = sel…

13 0 Open

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