postgreSQL troubleshooting 故障分析

1: 產品介紹

來自於

完全開源，兩板斧就可以安裝入庫

幫助DBA提供分析問題的手段，然後定位問題解決問題

Postgres provides various activity statistics that include detailed information about its behaviour: 

connections, statements, database operations, replication, resources usage and more. 

General purpose of the statistics is to help DBAs to monitor and troubleshoot Postgres. 

However, these statistics provided in textual form retrieved from SQL functions and views, 

and Postgres doesn't provide any tools for working with them. 

pgCenter's main goal is to help Postgres DBA manage statistics that theу have in their databases 

and see all the necessary data in convenient format based on builtin stats views and functions.

2：特色

Top-like interface that allows you to monitor stats changes as you go.  

When troubleshooting Postgres it's always important to keep an eye not only on Postgres metrics, 

but also system metrics, 

since Postgres utilizes system resources, such as cpu, memory, storage and network when working. 

pgCenter allows you to see both kinds of statistics related to Postgres and your system.

3：統計了哪些內容

pgCenter supports majority of statistics views available in Postgres, 

and at the same time, uses additional SQL functions applied to statistics to show these in a more convenient way. 

The following stats are available:

current summary activity - a compilation/selection of metrics from different sources - postgres uptime, version, recovery status, number of clients grouped by their states, number of (auto)vacuums, statements per second, age of the longest transaction and the longest vacuum;

pg_stat_activity - information related to the current activity of connected clients and Postgres background processes.

pg_stat_database - database-wide statistics, such as number of commits/rollbacks, handled tuples, deadlocks, temporary files, etc.

pg_stat_replication - statistics on replication, connected standby hosts and their activity.

pg_stat_user_tables, pg_statio_user_tables - statistics on accesses (including IO) to tables.

pg_stat_user_indexes, pg_statio_user_indexes - statistics on accesses (including IO) to indexes.

pg_stat_user_functions - statistics on execution of functions.

pg_stat_statements - statistics on SQL statements executed including time and resources usage.

statistics on tables sizes based on pg_relation_size() and pg_total_relation_size() functions;

pg_stat_progress_vacuum - information about (auto)vacuums status.

System statistics

pgcenter top also provides system usage information based on statistics from procfs filesystem:

load average and CPU usage time (user, system, nice, idle, iowait, software and hardware interrupts, steal);

memory and swap usage, amount of cached and dirty memory, writeback activity;

storage devices statistics: iops, throughput, latencies, average queue and requests size, devices utilization;

network interfaces statistics: throughput in bytes and packets, different kind of errors, saturation and utilization.

In case of connecting to remote Postgres there is possibility to use additional SQL functions used for

 retrieving /proc statistics from remote host.

4：其他類似產品，沒有用過，大家可以驗證一下，歡迎分享經驗

pg_top

99：多練習，多實踐，就可以找到各種問題，尤其效能故障，總可以找到蛛絲馬跡，只要你夠仔細認真。