# =============================================================================
# PostgreSQL 效能優化配置
# WOOO TECH - Momo Pro System
# 針對 8GB RAM 伺服器優化
# =============================================================================

# -----------------------------------------------------------------------------
# 連線設定
# -----------------------------------------------------------------------------
listen_addresses = '*'
max_connections = 100

# -----------------------------------------------------------------------------
# 記憶體配置 (針對 8GB RAM 優化)
# -----------------------------------------------------------------------------
# shared_buffers: 建議設為總 RAM 的 25% (8GB * 0.25 = 2GB)
shared_buffers = 2GB

# work_mem: 每個排序/Hash 操作的記憶體 (大型查詢需要更多)
# 計算: (RAM - shared_buffers) / (max_connections * 2)
work_mem = 64MB

# maintenance_work_mem: VACUUM, CREATE INDEX 等維護操作使用
maintenance_work_mem = 512MB

# effective_cache_size: 告訴 planner 系統總共有多少快取可用
# 建議設為總 RAM 的 75%
effective_cache_size = 6GB

# -----------------------------------------------------------------------------
# 磁碟 I/O 配置
# -----------------------------------------------------------------------------
# 使用 SSD 時建議調高
random_page_cost = 1.1
effective_io_concurrency = 200

# 預讀設定 (對於大表 Seq Scan 很重要)
seq_page_cost = 1.0

# -----------------------------------------------------------------------------
# WAL (Write-Ahead Log) 配置
# -----------------------------------------------------------------------------
wal_buffers = 64MB
checkpoint_completion_target = 0.9
max_wal_size = 2GB
min_wal_size = 1GB

# -----------------------------------------------------------------------------
# 查詢計劃器配置
# -----------------------------------------------------------------------------
# 鼓勵使用索引
enable_seqscan = on
enable_indexscan = on
enable_bitmapscan = on

# 並行查詢 (利用多核心)
max_parallel_workers_per_gather = 2
max_parallel_workers = 4
max_worker_processes = 8
parallel_tuple_cost = 0.01
parallel_setup_cost = 1000

# -----------------------------------------------------------------------------
# 自動 VACUUM 配置
# -----------------------------------------------------------------------------
autovacuum = on
autovacuum_vacuum_scale_factor = 0.1
autovacuum_analyze_scale_factor = 0.05

# -----------------------------------------------------------------------------
# 日誌配置
# -----------------------------------------------------------------------------
log_min_duration_statement = 1000
log_checkpoints = on
log_lock_waits = on

# -----------------------------------------------------------------------------
# 統計收集
# -----------------------------------------------------------------------------
track_activities = on
track_counts = on