MySQL with an init script

docker-compose.mysql.template

  mysql:
    image: mysql:5.7
    ports:
      - 3306:3306
    volumes:
#      - ./volume/mysql:/var/lib/mysql:rw
      - ./scripts/mysql/demo.sql:/docker-entrypoint-initdb.d/demo.sql:ro
    environment:
      MYSQL_ALLOW_EMPTY_PASSWORD: "yes"
      MYSQL_DATABASE: "sample"
      MYSQL_USER: "sample"
      MYSQL_PASSWORD: "sample"
    restart: always

My issue could also be caused by the connection pool size. Could you also let me know how to set the pool size through the docker compose? Thanks, Harry