shared_buffers       =  10GB
effective_cache_size =  14GB
maintenance_work_mem =  4GB
work_mem             =  10GB
random_page_cost = 3.5 
geqo_threshold = 15 
from_collapse_limit = 14
join_collapse_limit = 14
default_statistics_target    = 10000
constraint_exclusion         = on
checkpoint_completion_target = 0.9
wal_buffers                  = 32MB
checkpoint_segments          = 64
max_connections              = 10