[PostgreSQL] pgBackRest sauvegarder la standby

Backup From a Standby | pgBackRest (pmatseykanets.github.io)

[PostgreSQL] Vérifier le statut de la réplication

On master:

select * from pg_stat_replication;

On replica (streaming replication in my case):

select * from pg_stat_wal_receiver;

On your master, pg_stat_replication provides data about ongoing replication:

select client_addr, state, sent_location, write_location,
        flush_location, replay_location from pg_stat_replication;

On postgresql v10:

select client_addr, state, sent_lsn, write_lsn,
    flush_lsn, replay_lsn from pg_stat_replication;

On server

postgres=# select usename,application_name,client_addr,backend_start,state,sync_state from pg_stat_replication ;


On client

postgres=# select pg_is_in_recovery();

postgres=# select pg_last_xlog_receive_location();

postgres=#    SELECT CASE WHEN pg_last_xlog_receive_location() = pg_last_xlog_replay_location()
                  THEN 0
                ELSE EXTRACT (EPOCH FROM now() - pg_last_xact_replay_timestamp())
              END AS log_delay;

postgres=# select pg_last_xlog_replay_location();

[PostgreSQL] COMPRESS

Detecting inline, inline-compressed and TOAST storage

+--+--------------+------------------+----------+-----------+-------------+
|id|full_name     |uncompressed_bytes|compressed|out_of_line|bytes_on_disk|
+--+--------------+------------------+----------+-----------+-------------+
|1 |joe toast     |4004              |false     |true       |4000         |
|2 |joe compressed|3000              |true      |false      |44           |
|3 |joe inline    |10                |false     |false      |11           |

Deploy new postgreSQL instance dMZR

Deploy new postgreSQL instance dMZR

Modifier l'encodage PostgreSQL en UTF8

How to change PostgreSQL database encoding to UTF8 (shubhamdipt.com)

 

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)