Below are the steps for enabling archive mode or wal archiving in postgres.

STEPS TO ENABLE ARCHIVE MODE IN POSTGRES:

1. Check archive setting in the postgres config file:

postgres=# <strong>select name,setting from pg_settings where name like 'archive%' ;</strong>
          name           |  setting   
-------------------------+------------
 archive_cleanup_command | 
 archive_command         | (disabled)
<span style="color: #ff0000;"><strong> archive_mode            | off    --- >>> 
</strong></span> archive_timeout         | 0
(4 rows)

postgres=# <strong>show wal_level</strong>
 wal_level 
-----------
 <span style="color: #ff0000;"><strong>minimal</strong></span>
(1 row)

If wal_le

2. Now alter below parameters:

Alternatively you can change below parameter directly in the postgres.conf file:

postgres=# <strong>alter system set archive_mode=on;</strong>
ALTER SYSTEM

postgres=# <strong>alter system set archive_command='test ! -f /var/lib/edb/as12/archive/%f && cp %p /var/lib/edb/as12/archive/%f';</strong>
ALTER SYSTEM

postgres=# <strong>alter system set wal_level=replica;</strong>
ALTER SYSTEM

3. Now restart the postgres instance:

[root@]# <strong>systemctl stop edb-as-12</strong>
[root@]# <strong>systemctl start edb-as-12</strong>

-- ALTERNATIVELY YOU CAN USE PG_CTL COMMAND:

export PGDATA=/var/lib/edb/as12/data
pg_ctl stop
pg_ctl start

4. Now check archive mode:

postgres=# <strong>select name,setting from pg_settings where name like 'archive%';</strong>
          name           |                                   setting                                    
-------------------------+------------------------------------------------------------------------------
 archive_cleanup_command | 
 archive_command         | test ! -f /var/lib/edb/as12/archive/%f && cp %p /var/lib/edb/as12/archive/%f
<span style="color: #ff0000;"><strong> archive_mode            | on
</strong></span> archive_timeout         | 0
(4 rows)

postgres=# <strong>show wal_level;</strong>
 wal_level 
-----------
 <span style="color: #ff0000;"><strong>replica</strong></span>
(1 row)

5. Do manual log switch and check whether archive is generating or not:

postgres=# <strong>select pg_switch_wal();</strong>
 pg_switch_wal 
---------------
 0/1D392648
(1 row)

postgres=# <strong>select pg_switch_wal();</strong>
 pg_switch_wal 
---------------
 0/1E000000
(1 row)

[enterprisedb@localhost archive]$ pwd
/var/lib/edb/as12/archive


-rw-------. 1 enterprisedb enterprisedb 16777216 Oct 20 19:44 00000001000000000000001C
-rw-------. 1 enterprisedb enterprisedb 16777216 Oct 20 19:56 00000001000000000000001D

STEPS TO DISABLE ARCHIVE MODE:

1. Set archive_mode to off:

postgres=# <strong>alter system set archive_mode=off;</strong>
ALTER SYSTEM

2. Now restart the postgres instance:

[root@]# <strong>systemctl stop edb-as-12</strong>
[root@]# <strong>systemctl start edb-as-12</strong>

3. Check archive mode:

postgres=# <strong>select name,setting from pg_settings where name like 'archive%';</strong>
          name           |                                   setting                                    
-------------------------+------------------------------------------------------------------------------
 archive_cleanup_command | 
 archive_command         | test ! -f /var/lib/edb/as12/archive/%f && cp %p /var/lib/edb/as12/archive/%f
<span style="color: #ff0000;"><strong> archive_mode            | off
</strong></span> archive_timeout         | 0
(4 rows)