PostgreSQL bonnes pratiques

Restriction du schéma « public »
Définir des nouveaux tablespaces pour les données et indexes et temp et changer le nom du tablespace par défaut (data et temp)

 

[HVAULT] Roles postgreSQL

Script de création des roles HVAULT dans ibm cloud pour  postgreSQL (dMZR);

[PostgreSQL] restore de blobs

SELECT lo_unlink(oid) FROM pg_largeobject_metadata;
WARNING:  out of shared memory
ERROR:  out of shared memory
HINT:  You might need to increase max_locks_per_transaction.

 

[PostgreSQL]tables sans oid en big serial

select sch.nspname as schemaname,
       tab.relname as tablename,
       col.attname as columnname,
       col.attnum as columnnumber,
       col.atttypid,
       typ.typname as columntype
from pg_attribute col
join pg_type typ on col.atttypid = typ.oid
join pg_class tab on col.attrelid = tab.oid
join pg_namespace sch on tab.relnamespace = sch.oid
left join pg_attrdef def on tab.oid = def.adrelid
and col.attnum = def.adnum
left join pg_depend deps on def.oid = deps.objid
and deps.deptype = 'N'
where sch.nspname != 'information_schema'
       and sch.nspname not like 'pg_%' -- won't work if you have user schemas matching pg_
       and col.attnum > 0
       and typ.typcategory = 'N'
       and col.attnotnull = true
       and typ.typname = 'int4'
order by sch.nspname,
       tab.relname,
       col.attnum;


with seqs as
       (select oid,
             relname as sequencename
             from pg_class
             where relkind = 'S' )
select sch.nspname as schemaname,
       tab.relname as tablename,
       col.attname as columnname,
       col.attnum as columnnumber,
       col.atttypid,
       typ.typname as columntype,
       seq.sequencename
from pg_attribute col
join pg_type typ on col.atttypid = typ.oid
join pg_class tab on col.attrelid = tab.oid
join pg_namespace sch on tab.relnamespace = sch.oid
left join pg_attrdef def on tab.oid = def.adrelid
and col.attnum = def.adnum
left join pg_depend deps on def.oid = deps.objid
and deps.deptype = 'N'
left join seqs seq on deps.refobjid = seq.oid
where sch.nspname != 'information_schema'
       and sch.nspname not like 'pg_%' -- won't work if you have user schemas matching pg_
       and col.attnum > 0
       and typ.typcategory = 'N'
       and col.attnotnull = true
order by sch.nspname,
       tab.relname,
       col.attnum;

select sch.nspname as schemaname,
       tab.relname as tablename,
       col.attname as columnname,
       col.attnum as columnnumber,
       col.atttypid,
       typ.typname as columntype
from pg_attribute col
join pg_type typ on col.atttypid = typ.oid
join pg_class tab on col.attrelid = tab.oid
join pg_namespace sch on tab.relnamespace = sch.oid
left join pg_attrdef def on tab.oid = def.adrelid
and col.attnum = def.adnum
left join pg_depend deps on def.oid = deps.objid
and deps.deptype = 'N'
where sch.nspname != 'information_schema'
       and sch.nspname not like 'pg_%' -- won't work if you have user schemas matching pg_
       and col.attnum > 0
       and typ.typcategory = 'N'
       and col.attnotnull = true
       and typ.typname = 'int4'
order by sch.nspname,
       tab.relname,
       col.attnum;


with seqs as
       (select oid,
             relname as sequencename
             from pg_class
             where relkind = 'S' )
select sch.nspname as schemaname,
       tab.relname as tablename,
       col.attname as columnname,
       col.attnum as columnnumber,
       col.atttypid,
       typ.typname as columntype,
       seq.sequencename
from pg_attribute col
join pg_type typ on col.atttypid = typ.oid
join pg_class tab on col.attrelid = tab.oid
join pg_namespace sch on tab.relnamespace = sch.oid
left join pg_attrdef def on tab.oid = def.adrelid
and col.attnum = def.adnum
left join pg_depend deps on def.oid = deps.objid
and deps.deptype = 'N'
left join seqs seq on deps.refobjid = seq.oid
where sch.nspname != 'information_schema'
       and sch.nspname not like 'pg_%' -- won't work if you have user schemas matching pg_
       and col.attnum > 0
       and typ.typcategory = 'N'
       and col.attnotnull = true
order by sch.nspname,
       tab.relname,
       col.attnum;

[PostgreSQL] Find all the table and index size

SELECT
    TableName
    ,pg_size_pretty(pg_table_size(TableName)) AS TableSize
    ,pg_size_pretty(pg_indexes_size(TableName)) AS IndexSize
    ,pg_size_pretty(pg_total_relation_size(TableName)) AS TotalSize
FROM 
(
     SELECT ('"' || table_schema || '"."' || table_name || '"') AS TableName
     FROM information_schema.tables
) AS Tables
ORDER BY 4 DESC

source :How to Get Table Size, Database Size, Indexes Size, schema Size, Tablespace Size, column Size in PostgreSQL Database (tutorialdba.com)

[PostgreSQL] Streaming Replication Monitoring Script

Script de création d'une fonction "streaming_slave_check" pour la réplication en postgreSQL.

[PostgreSQL] repmgr tuto

Tutoriel d'installation pour repgmr

[PostgreSQL] Anonymisation des données

Procédure d'anonymisation des données

PostgreSQL Un tour d'horizon !

PostgreSQL around the world

 

PostgreSQL 16 is out.

https://www.postgresql.org/docs/16/release-16.html

 

Digging into PostgreSQL iceberg

https://avestura.dev/blog/explaining-the-postgres-meme

 

PostgreSQL partitioning

https://www.timescale.com/blog/when-to-consider-postgres-partitioning/

 

Who does PostgreSQL

https://momjian.us/main/blogs/pgblog/2023.html#September_11_2023

 

[Postgres] NEWS

There is some new about PostgreSQL world.

 

Some useful tricks and tips about PostgreSQL, like how to get unused index list (but so many more like displaying fun smiley instead of blanks for NULL…)

https://www.crunchydata.com/postgres-tips

 

Some basics about transactions with examples

https://stormatics.tech/salmans-planet-postgresql/how-to-execute-transactions-in-postgresql

 

Huge progress with replication; implement bi-directional replication with upcoming PostgreSQL 16

https://www.postgresql.fastware.com/blog/bi-directional-replication-using-origin-filtering-in-postgresql