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From: Ron Johnson <ronljohnsonjr@gmail.com>
Date: Sat, 23 Aug 2025 09:56:34 -0400
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 <CANzqJaDPO2X3XSwj1SC5FA5ybgds0Z0iehX4GpwnOft9eVfOPg@mail.gmail.com>
Subject: Associating a pg_basebackup .backup file with it's saveset?
To: Pgsql-admin <pgsql-admin@lists.postgresql.org>
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PG 16.10

(I'd rather use PgBackRest, but can't due to the fact that
the immutable filesystem where we must store backup files doesn't support
links. =F0=9F=98=9E)

Thus, I'm archiving WAL files and taking basebackups.

At some point, when I'm ready to delete the oldest basebackup directory,
I'll also of course need to run "pg_archivecleanup /Database/backups/wals
mumble".

The .backup file is not in the pg_wal.tar file, so how do I know which
.backup file to use?

archive_command =3D '/usr/local/bin/postgres/wal_archive.sh "%p" "%f"'

$ cd /Database/backups/wals
$ dir *backup
-rw------- 1 postgres postgres 341 2025-08-23 08:42:39
000000010000000200000023.00000028.backup
-rw------- 1 postgres postgres 341 2025-08-23 09:24:48
000000010000000200000035.00000028.backup

$ dir /Database/backups/basebackup/
total 0
drwxr-xr-x 2 postgres postgres 113 2025-08-23 08:42:41
2025-08-23_08-42-36_full/
drwxr-xr-x 2 postgres postgres 113 2025-08-23 09:24:50
2025-08-23_09-24-43_full/

$ dir /Database/backups/basebackup/2025-08-23_09-24-43_full/
total 152896
-rw------- 1 postgres postgres    612541 2025-08-23 09:24:48 backup_manifes=
t
-rw------- 1 postgres postgres 153057906 2025-08-23 09:24:48 base.tar.zst
-rw------- 1 postgres postgres   2847732 2025-08-23 09:24:48 pg_wal.tar.xz
-rw-r--r-- 1 postgres postgres     37864 2025-08-23 09:24:50 schemata.tar.x=
z

--=20
Death to <Redacted>, and butter sauce.
Don't boil me, I'm still alive.
<Redacted> lobster!

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<div dir=3D"ltr"><div>PG 16.10</div><div><br></div><div>(I&#39;d rather use=
 PgBackRest, but can&#39;t due to the fact that the=C2=A0immutable=C2=A0fil=
esystem where we must store backup files doesn&#39;t support links. =F0=9F=
=98=9E)</div><div><br></div><div>Thus, I&#39;m archiving WAL files and taki=
ng basebackups.</div><div><br></div><div>At some point, when I&#39;m ready =
to delete the oldest basebackup directory, I&#39;ll also of course need to =
run &quot;<font face=3D"monospace">pg_archivecleanup=C2=A0/Database/backups=
/wals mumble</font>&quot;.</div><div><br></div><div>The .backup file is not=
 in the=C2=A0pg_wal.tar file, so=C2=A0how do I know which .backup file to u=
se?</div><div><br></div><div><font face=3D"monospace">archive_command =3D &=
#39;/usr/local/bin/postgres/wal_archive.sh &quot;%p&quot; &quot;%f&quot;=
9;</font></div><div><br></div><div><font face=3D"monospace">$ cd /Database/=
backups/wals<br>$ dir *backup<br>-rw------- 1 postgres postgres 341 2025-08=
-23 08:42:39 000000010000000200000023.00000028.backup<br>-rw------- 1 postg=
res postgres 341 2025-08-23 09:24:48 000000010000000200000035.00000028.back=
up<br></font></div><div><font face=3D"monospace"><br></font></div><div><fon=
t face=3D"monospace">$ dir /Database/backups/basebackup/<br>total 0<br>drwx=
r-xr-x 2 postgres postgres 113 2025-08-23 08:42:41 2025-08-23_08-42-36_full=
/<br>drwxr-xr-x 2 postgres postgres 113 2025-08-23 09:24:50 2025-08-23_09-2=
4-43_full/</font></div><div><font face=3D"monospace"><br></font></div><div>=
<font face=3D"monospace">$ dir /Database/backups/basebackup/2025-08-23_09-2=
4-43_full/<br>total 152896<br>-rw------- 1 postgres postgres =C2=A0 =C2=A06=
12541 2025-08-23 09:24:48 backup_manifest<br>-rw------- 1 postgres postgres=
 153057906 2025-08-23 09:24:48 base.tar.zst<br>-rw------- 1 postgres postgr=
es =C2=A0 2847732 2025-08-23 09:24:48 pg_wal.tar.xz<br>-rw-r--r-- 1 postgre=
s postgres =C2=A0 =C2=A0 37864 2025-08-23 09:24:50 schemata.tar.xz</font></=
div><div><br></div><span class=3D"gmail_signature_prefix">-- </span><br><di=
v dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"gmail_signature">=
<div dir=3D"ltr">Death to &lt;Redacted&gt;, and butter sauce.<div>Don&#39;t=
 boil me, I&#39;m still alive.<br><div><div>&lt;Redacted&gt; lobster!</div>=
</div></div></div></div></div>

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