select pid ,usename,client_addr,state,pg_wal_lsn_diff(pg_current_wal_lsn(),write_lsn) write_depaly,pg_wal_lsn_diff(pg_current_wal_lsn(),flush_lsn) flush_delay,pg_wal_lsn_diff(pg_current_wal_lsn(),replay_lsn) re
为了避免不必要的开销,状态字段的操作应该在没有实际原子操作的情况下进行(即只有pg_atomic_read_u32()和pg_atomic_unlocked_write_u32())。wait_backend_pgprocno:等待引用计数变为1的进程的id,通常是要vacuum要整理页面,做垃圾清理。其他进程在UnpinBuffer的时候,会检查是否设置了BM_PIN_COUNT_WAITER(如果设置...
tcp_keepalives_idle = 7200 tcp_keepalives_interval = 130 tcp_keepalives_count = 3 shared_buffers = 256MB work_mem = 16MB maintenance_work_mem = 128MB wal_level = logical full_page_writes = on max_wal_size = 1GB min_wal_size = 80MB wal_keep_segments = 32 logging_collector = o...
Hi All, Thank you all for your previous advices. Now I am able to insert 1190- 1210 records per seconds. Now I just want to know by what extend I could stretch it. What is the maximum insert I can achieve in one second? What is the maximum number of insert postgresql achieved so f...
Airbyte uses logical replication of the Postgres write-ahead log (WAL) to incrementally capture deletes using a replication plugin:See here to learn more on how Airbyte implements CDC. See here to learn more about Postgres CDC requirements and limitations....
deadlocks: 56 (0.93 per sec.) read/write requests: 597246 (9953.02 per sec.) 读写总数(每秒读写次数) other operations: 62812 (1046.75 per sec.) General statistics: total time: 60.0065s 总耗时 total number of events: 31378 共发生多少事务数 ...
This blog compares how PostgreSQL and MySQL handle millions of queries per second. Anastasia: Can open source databases cope with millions of queries per second? Many open source advocates would answer “yes.” However, assertions aren’t enough for well-grounded proof. That’s why in this blog...
To start with, Postgres splits its I/O activity into writing the WAL stream, and reads/writes to the data directory. The real challenge is understanding second-order effects around writes: Typically the write to the data directory happens after the…Continue reading Never run VACUUM FULL: ...
(DAE) vSphere 5.1 express patch 2 build 1021289 32 vCPUs, 12GB vRAM, 3 virtual disks (1 per VMFS data store) SUSE Linux Enterprise Server 11 SP1 (SLES11 SP1) 64-bit; vPostgres DATA directory, vPostgres WAL (write-ahead log) directory and the rest (e.g., root file system and swap...
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