backend_flush_after = 256 synchronous_commit = off full_page_writes = off wal_buffers = 128MB wal_writer_delay = 10ms wal_writer_flush_after = 4MB checkpoint_timeout = 55min max_wal_size = 256GB checkpoint_flush
默认: old_snapshot_threshold = -1,取值范围1min-60d、-1表示禁用,0表示立即 重启数据库生效Timebefore a snapshotistoo oldtoread pages changedafterthe snapshot was taken. 2.6.6 backend_flush_after backend_flush_after=0# measured in pages, 0 disables...
# (需要重启生效) #backend_flush_after = 0 # 只要一个后端写入了超过backend_flush_after字节, 就会尝试强制 OS 把这些写发送到底层存储。 # 合法的范围位于0 (禁用受控写回)和2MB之间。默认是0(即没有刷写控制) #--- # 预写式日志 #--- # - Settings - ...
PostgreSQL 的 Azure Cosmos DB (由 PostgreSQL 的Citus 数据库扩展提供支持) 有各种服务器参数会影响 Azure Cosmos DB for PostgreSQL 的行为,无论是来自标准 PostgreSQL 还是特定于 Azure Cosmos DB for PostgreSQL。 可以在 Azure 门户中为群集设置这些参数。 在“设置”类别下,选择“工作器节点参数”或“协调器...
backend_flush_after 0 bgwriter_delay 10 checkpoint_timeout 30 constraint_exclusion partition cpu_index_tuple_cost 0.005 cpu_operator_cost 0.0025 cpu_tuple_cost 0.01 datestyle 'ISO,YMD' deadlock_timeout 1000 default_with_oids off dynamic_shared_memory_type ...
backend_flush_after - 先前執行寫入的頁數會排清到磁碟 backslash_quote - 設定字串常值中是否允許 “'” bgwriter_delay - 背景寫入器在四捨五入之間的睡眠時間 bgwriter_flush_after - 先前執行寫入的頁數會排清到磁碟 bgwriter_lru_maxpages - 每個回合要排清的背景寫入器最大 LRU 頁面數目 bgwriter_lru_mul...
backend_flush_after,(单位:BLCKSZ) 当某backendprocess writedirtypage的数量超过配置阈值时,触发调用OSsync_file_range,告诉osbackendflush 线程异步刷盘。 从而削减osdirtypage堆积。bgwriter_flush_after,(单位:BLCKSZ) 当bgwriterprocess writedirtypage的数量超过配置阈值时,触发调用OSsync_file_range,告诉osbackend...
不仅仅是bgwriter,即使checkpoint进程和用户进程也从shared buffer刷写脏页到OS cache。可以通过checkpoint_flush_after影响checkpoint进程的fsync,通过backend_flush_after影响后台进程的fsync。 缓存 pg_buffercache pg_prewarm pgfincore pg_dropcache 1.pg_buffercache简介 ...
#backend_flush_after = 0 # 只要一个后端写入了超过backend_flush_after字节, 就会尝试强制 OS 把这些写发送到底层存储。 # 合法的范围位于0 (禁用受控写回)和2MB之间。默认是0(即没有刷写控制) #--- # 预写式日志 #--- # - Settings - wal_level = hot...
backend_flush_after | 0 | Number of pages after which previously performed writes are flushed to disk. backslash_quote | safe_encoding | Sets whether "'" is allowed in string literals. bgwriter_delay | 200ms | Background writer sleep time between rounds. ...