services:
  db:
    # If you use a config generator, use the value below for your
    # "ram" size
    shm_size: 4gb
    command:
      - "postgres"
      - "-c"
      - "max_connections=40"
      - "-c"
      - "shared_buffers=1GB"
      - "-c"
      - "effective_cache_size=3GB"
      - "-c"
      - "maintenance_work_mem=512MB"
      - "-c"
      - "checkpoint_completion_target=0.9"
      - "-c"
      - "wal_buffers=16MB"
      - "-c"
      - "default_statistics_target=500"
      - "-c"
      - "random_page_cost=1.1"
      - "-c"
      - "effective_io_concurrency=200"
      - "-c"
      - "work_mem=6553kB"
      - "-c"
      - "min_wal_size=4GB"
      - "-c"
      - "max_wal_size=16GB"
      - "-c"
      - "max_worker_processes=4"
      - "-c"
      - "max_parallel_workers_per_gather=2"
      - "-c"
      - "max_parallel_workers=4"
      - "-c"
      - "max_parallel_maintenance_workers=2"