2026-03-12 21:01:38

postgresql/pitr_example_01.txt

@@ -0,0 +1,71 @@
+create table players (id int, about text, age int);
+insert into players (id, about, age) 
+	values (generate_series(1, 5000),  
+			repeat('A cool player. ', 2) || 'My number is ' || trunc(random()*1000), 
+			trunc(random()*10 * 2 + 10));
+
+
+*******************************************
+dbaquaris=> select count(*) from players;
+  5000
+
+dbaquaris=> select current_timestamp;
+ 2023-07-09 17:13:00.860309+02
+*******************************************
+
+
+insert into players (id, about, age) 
+	values (generate_series(1, 100000),  
+			repeat('A cool player. ', 2) || 'My number is ' || trunc(random()*1000), 
+			trunc(random()*10 * 2 + 10));
+
+*******************************************
+dbaquaris=> select count(*) from players;
+ 105000
+
+dbaquaris=> select current_timestamp;
+ 2023-07-09 17:36:08.502146+02
+*******************************************
+
+insert into players (id, about, age) 
+	values (generate_series(1, 1000000),  
+			repeat('A cool player. ', 2) || 'My number is ' || trunc(random()*1000), 
+			trunc(random()*10 * 2 + 10));
+
+
+*******************************************
+dbaquaris=> select count(*) from players;
+ 1105000
+
+dbaquaris=> select current_timestamp;
+ 2023-07-09 17:37:32.076851+02
+*******************************************
+
+# PITR to 2023-07-09 17:36:08
+
+- stop PostgreSQL
+- take one of the base backup before ther PITR and put it ion a temporary folder
+
+mkdir /backup/postgresql/tmp
+cd /backup/postgresql/tmp
+gunzip -c /backup/postgresql/daily/2023-07-09__16_43_59_emptydb.tar.gz | tar -xvf -
+
+- add in modify postgresql.conf
+
+restore_command = 'cp /backup/postgresql/wal/%f %p'
+recovery_target_time = '2023-07-09 17:36:08'
+recovery_target_inclusive = true
+
+- create recovery.signal file
+touch recovery.signal
+
+- start PostgreSQL server with the data in the temporary directory
+pg_ctl start -D /backup/postgresql/tmp -l /tmp/reco.log
+
+
+- check logfile; at the end of the recovery you will be asked to execute the following fonction in order to open the instance
+select pg_wal_replay_resume();
+
+- stop PostgreSQL server with the data in the temporary directory
+pg_ctl stop -D /backup/postgresql/tmp -l /tmp/reco.log
+