时间戳是自 1970 年 1 月 1 日（00:00:00 GMT）以来的秒数。它也被称为 Unix 时间戳（Unix T...
1.前⾔ Prometheus：是从云原⽣计算基⾦会（CNCF）毕业的项⽬。Prometheus是Google监控系统BorgMon类似实现的开源版，整套系统由监控服务、告警服务、时序数据库等⼏个部分，及周边⽣态的各种指标收集器（Exporter）组成，是在当下主流的监控告警系统。exporter：⼴义上向Prometheus提供监控数据的程序都可以成为...
query: "SELECT CASE WHEN NOT pg_is_in_recovery() THEN 0 ELSE GREATEST (0, EXTRACT(EPOCH FROM (now() - pg_last_xact_replay_timestamp())) END AS lag" master: true metrics: - lag: usage: "GAUGE" description: "Replication lag behind master in seconds" pg_postmaster: query: "SELECT ...
显示备库最近接收的WAL日志位置: select pg_last_wal_receive_lsn(); 显示备库最近应用的WAL日志位置: select pg_last_wal_replay_lsn(); 显示备库最近事务的应用时间: select pg_last_xact_replay_timestamp(); 显示主库WAL当前写入位置: select pg_current_wal_lsn(); 2. 流复制备升主库 建议主备库事...
postgres=#selectnow()-pg_last_xact_replay_timestamp(); ?column?---74days-15:49:18.659168(1row)--可见由于两边时间不同步导致此方式无效,所以此方法需要两边的时间是同步的(使用ntp),另外一个问题是如果主库没有事务,则备端最近应用的时间就会隔得比较长,导致显示的差异时间比较大而误报--对比日志延迟...
select pg_last_xact_replay_timestamp(); 显示主库WAL当前写入位置: select pg_current_wal_lsn(); 2. 流复制备升主库 建议主备库事先做个快照 首先判断主备库 ps -ef | grep "wal" 可以查看有 主 备: 或者查看以下SQL 有内容的为主库,没有内容的为从库。
query: "SELECT CASE WHEN NOT pg_is_in_recovery() THEN 0 ELSE GREATEST (0, EXTRACT(EPOCH FROM (now() - pg_last_xact_replay_timestamp())) END AS lag" master: true metrics: - lag: usage: "GAUGE" description: "Replication lag behind master in seconds" pg...
pg_last_xlog_receive_location() pg_last_xlog_replay_location() pg_last_xact_replay_timestamp() 如下: postgres=# select pg_last_xlog_receive_location(),pg_last_xlog_replay_location(),pg_last_xact_replay_timestamp(); pg_last_xlog_receive_location | pg_last_xlog_replay_location |pg_last...
pg_replication:query:"SELECT CASE WHEN NOT pg_is_in_recovery() THEN 0 ELSE GREATEST (0, EXTRACT(EPOCH FROM (now() - pg_last_xact_replay_timestamp())) END AS lag"master:truemetrics:-lag:usage:"GAUGE"description:"Replication lag behind master in seconds"pg_postmaster:query:"SELECT pg_pos...
PG9.1新功能介绍