我的 PostgreSQL 9.4.1 服务器出现性能问题。我已经使用通常的最佳实践（pgtune + google）调整了服务器。这是相关的配置：
# <snip> the default config above
default_statistics_target = 50
maintenance_work_mem = 960MB
constraint_exclusion = on
checkpoint_completion_target = 0.9
effective_cache_size = 11GB
work_mem = 96MB
wal_buffers = 8MB
checkpoint_segments = 16
shared_buffers = 4GB
max_connections = 200
autovacuum = on
log_autovacuum_min_duration = 10000
autovacuum_max_workers = 5
autovacuum_naptime = 1min
autovacuum_vacuum_threshold = 50
autovacuum_analyze_threshold = 25
autovacuum_vacuum_scale_factor = 0.2
autovacuum_analyze_scale_factor = 0.1
#autovacuum_freeze_max_age = 200000000
autovacuum_vacuum_cost_delay = 20ms
autovacuum_vacuum_cost_limit = -1
#log_statement='mod'
#log_statement='all'
logging_collector = on …postgresql performance database-tuning postgresql-9.4 performance-tuning