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### Extended Implementation ```python import time import mysql.connector import psycopg2 import pymongo from contextlib import contextmanager # Define the databases to compare databases = { 'mysql': mysql.connector.connect( host='localhost', user='root', password='password', database='testdb' ), 'postgresql': psycopg2.connect( host='localhost', user='root', password='password', dbname='testdb' ), 'mongodb': pymongo.MongoClient('mongodb://localhost:27017/')['testdb'] } # Define the indexing strategies to compare indexing_strategies = { 'mysql': ['BTREE', 'HASH'], 'postgresql': ['BTREE', 'HASH'], 'mongodb': ['BTREE', 'HASH'] } # Define the test data test_data = [ {'id': 1, 'name': 'John Doe'}, {'id': 2, 'name': 'Jane Doe'}, {'id': 3, 'name': 'Bob Smith'} ] # Define the test queries test_queries = [ {'query': 'SELECT * FROM table WHERE name = "John Doe"', 'type': 'sql'}, {'query': 'SELECT * FROM table WHERE id = 1', 'type': 'sql'} ] @contextmanager def managed_cursor(connection): cursor = connection.cursor() try: yield cursor finally: