[Postgres] Monitor autovacuum_freeze_max_age

This query allows you to monitor the : autovacuum_freeze_max_age

 

SELECT datname, round(age(datfrozenxid)/to_number(current_setting('autovacuum_freeze_max_age'),'999999999')*100,1) as Percent FROM pg_database where datname != 'template0';

[Postgres] Monitor wait event

\t
select wait_event_type, wait_event from pg_stat_activity where pid !=pg_backend_pid();
\watch 0.5

[Postgres] Solve PostgreSQL DataFileRead and buffer_io with Parameter Tuning

Click her to see the next.

[Postgres] Tuto tuning

This site helped to resolve IPC wait event : Postgres checkpoint tuning | Tembo Docs

You have to adapt the checkpoint_timeout within the max_wal_size.

If the max_wal_size is 8Go then you can increase the default value of checkpoint_timeout (which is 5 min).

 

For big database with big wal size, you need to increase the checkpoint_timeout to avoid IPC wait event on the Buffers.

 

 

[Postgres] Identifier les privilèges

SELECT *   FROM information_schema.role_table_grants  WHERE grantee = '<role_name>';

[Postgres] Identifier les attentes

This query allows you to identify the wait events on which query .

How to Find and Stop Running Queries on PostgreSQL

Find a query with his pid.

[Postgres] PG_PARTMAN

pg_partman v4 vs pg_partman v5 

Une fonction diffère. 

Conséquence la version 5 va gérer nativement la rotation des partitions et pas la 4 

voici la fonction : 

[Postgres] Extensions

Extensions en prd indispensables : 

[Postgres] Monitor cloud DB (AZURE / IBM)

Quand on n'a pas d'outils pour faire le monitoring des bases PostgreSQL hébergées dans le cloud (IBM ou AZURE...)

voici quelques requêtes , vue, fonction SQl utiles pour interroger la base : 

[Postgres] Locker une base

On ne peut pas locker une base nativement alors comment peut -on le faire ?