shared_buffers = 1024MB # default/32MB                  # min 128kB or max_connections*16kB
maintenance_work_mem = 128MB # default 16MB             # min 1MB
wal_buffers = 1MB #default 64kB                 # min 32kB
checkpoint_segments = 128 #default 3            # in logfile segments, min 1, 16MB each
checkpoint_completion_target = 0.9 #default 0.5 # checkpoint target duration, 0.0 - 1.0
effective_cache_size = 2048MB # default 128MB