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Postgresql 檢查數(shù)據(jù)庫(kù)主從復(fù)制進(jìn)度的操作

 更新時(shí)間：2020年12月30日 15:42:27   作者：ChuckChen1222  
這篇文章主要介紹了Postgresql 檢查數(shù)據(jù)庫(kù)主從復(fù)制進(jìn)度的操作，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。一起跟隨小編過(guò)來(lái)看看吧

如何查看主從復(fù)制的狀態(tài)，且備庫(kù)應(yīng)用落后了多少字節(jié)

這些信息要在主庫(kù)中查詢(xún)

查看流復(fù)制的信息可以使用主庫(kù)上的視圖

select pid,state,client_addr,sync_priority,sync_state from pg_stat_replication;

pg_stat_replication中幾個(gè)字?jǐn)嘤涗浟税l(fā)送wal的位置及備庫(kù)接收到的wal的位置、

sent_location--發(fā)送wal的位置

write_location--備庫(kù)接收到的wal的位置

flush_location—備庫(kù)寫(xiě)wal日志到磁盤(pán)的位置

replay_location—備庫(kù)應(yīng)用日志的位置

查看備庫(kù)落后主庫(kù)多少字節(jié)

select pg_xlog_location_diff(pg_current_xlog_location(),replay_location)/1024/1024 as MB from pg_stat_replication;
select pg_xlog_location_diff(pg_current_xlog_location(),replay_location)/1024/1024/1024 as GB from pg_stat_replication;

級(jí)聯(lián)復(fù)制

select pg_xlog_location_diff(pg_last_xlog_replay_location(),replay_location)/1024/1024/1024 as GB from pg_stat_replication;

補(bǔ)充：pgsql之查看主備復(fù)制延遲

查看復(fù)制延遲：

10.0及以上：

SELECT 
  pg_wal_lsn_diff(A .c1, replay_lsn) /(1024 * 1024) AS slave_latency_MB,
  pg_wal_lsn_diff(A .c1, sent_lsn) /(1024 * 1024) AS send_latency_MB,
  pg_wal_lsn_diff(A .c1, flush_lsn) /(1024 * 1024) AS flush_latency_MB,
  state,
  backend_start,
  now()::timestamp with time zone
 FROM pg_stat_replication, pg_current_wal_lsn() AS A(c1)
 WHERE client_addr='192.168.46.173' and application_name = 'standby1'
 ORDER BY slave_latency_MB, send_latency_MB DESC
 LIMIT 1;

注：

192.168.46.173 表示從庫(kù)ip地址。

pg_wal_lsn_diff(lsn pg_lsn, lsn pg_lsn):計(jì)算兩個(gè)預(yù)寫(xiě)式日志位置間的差別。

pg_current_wal_lsn()：獲得當(dāng)前預(yù)寫(xiě)式日志寫(xiě)入位置

小于10.0版本：

SELECT 
  pg_xlog_location_diff(A .c1, replay_lsn) /(1024 * 1024) AS slave_latency_MB,
  pg_xlog_location_diff(A .c1, sent_lsn) /(1024 * 1024) AS send_latency_MB,
  pg_xlog_location_diff(A .c1, flush_lsn) /(1024 * 1024) AS flush_latency_MB,
  state,
  backend_start,
  now()::timestamp with time zone
 FROM pg_stat_replication, pg_current_xlog_location AS A(c1)
 WHERE client_addr='192.168.46.173' and application_name = 'standby1'
 ORDER BY slave_latency_MB, send_latency_MB DESC
 LIMIT 1;

注：

192.168.46.173 表示從庫(kù)ip地址。

pg_xlog_location_diff(lsn pg_lsn, lsn pg_lsn):計(jì)算兩個(gè)預(yù)寫(xiě)式日志位置間的差別。

pg_current_xlog_location ()：獲得當(dāng)前預(yù)寫(xiě)式日志寫(xiě)入位置

以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教。

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