PostgreSQL监控脚本

往往我们对着一堆系统状态视图不知所措,这里我整理一些学习到的脚本:

后续慢慢补充~


--20170913--
这部分参考了http://blog.postgresql-consulting.com

pg_stat_replication:
SELECT
  client_addr AS client, usename AS user, application_name AS name,
  state, sync_state AS mode,
  (pg_xlog_location_diff(pg_current_xlog_location(),sent_location) / 1024)::bigint as pending,
  (pg_xlog_location_diff(sent_location,write_location) / 1024)::bigint as write,
  (pg_xlog_location_diff(write_location,flush_location) / 1024)::bigint as flush,
  (pg_xlog_location_diff(flush_location,replay_location) / 1024)::bigint as replay,
  (pg_xlog_location_diff(pg_current_xlog_location(),replay_location))::bigint / 1024 as total_lag
FROM pg_stat_replication;

 

 


pg_stat_all_tables:

 

SELECT
    schemaname, relname,
    seq_scan, seq_tup_read,
    seq_tup_read / seq_scan as avg_seq_tup_read
FROM pg_stat_all_tables
WHERE seq_scan > 0
ORDER BY 5 DESC LIMIT 5;

 

 

pg_stat_database:
查看数据库块命中率:
SELECT datname,
100 * blks_hit / (blks_hit + blks_read) as cache_hit_ratio FROM pg_stat_database WHERE (blks_hit + blks_read) > 0;

or:

SELECT 
  round(100 * sum(blks_hit) / sum(blks_hit + blks_read), 3) as cache_hit_ratio
FROM pg_stat_database;

 

SELECT 
  datname, 100 * xact_commit / (xact_commit + xact_rollback) as commit_ratio
FROM pg_stat_database WHERE (xact_commit + xact_rollback) > 0;

 

pg_stat_bgwriter:

 

pg_stat_bgwrite:

 --20170913--

    原文作者:PostgreSQL
    原文地址: https://www.cnblogs.com/kuang17/p/7515170.html
    本文转自网络文章,转载此文章仅为分享知识,如有侵权,请联系博主进行删除。
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