These files were backed up to another Linux system. Is it possible to convert it into a program readable format? I can write a script in most languages to read them.
On Jan 11, 2024, at 3:18 PM, Holger Jakobs <holger@xxxxxxxxxx> wrote:
You can always dump the contents of a running instance (called
cluster) using pg_dumpall creating a text file with SQL commands,
which can be fed subsequently into any empty, but running
installation of the same or more recent version of the server
using psql.
What isn't possible is getting a corrupted copy of the data
directory back to life.
Unless you took the copy while the database server was completely
down, regard it unusable.
If the copy isn't corrupt, you can start it on the same
architecture with the same major version of the software again
using pg_ctl. Look at the help of the program for details.
When the database system is running again, take a dump with
pg_dumpall.
Am 11.01.24 um 22:12 schrieb Andrew
Wang:
They were separated. The source list in Ubuntu 18 was moved
because the 16 is different from former versions, which caused the
problem, as I upgraded the Linux system before, it worked very
well.
I tried to install the 15 and 16, but the configuration
complained ports and other things. Any way to dump all into a
format from another computer and then read them into the new 16?
"I assumed they can merged into 16 but they
were not after upgrading my system."
Yeah... that's a pretty unfounded assumption.
Fortunately, your data might be salvageable,
if the new system has separate -- and populated --
directories for 12, 13 and 14. Were any of the source
system Postgresql instances running when you ran rsync?
If not, then you can install the old versions of
Postgresql in parallel with 16, and then run pg_upgrade.
I used “rsync” in Linux to backup the
the entire directory that contained data for 12,13
and 15. The last 15 was gone after upgrading to 16
with Ubuntu 22.04. I assumed they can merged into 16
but they were not after upgrading my system.
Did you take basebackup?
1. What is the source of the data
that you copied to /var/lib/pgsql/15/main?
2. What errors or problems are you
having?
Dear staff at pqsql,
I try to restore all
data from
/var/lib/pgsql/15/main,
but do not know how and have not
found hits from your web as
detailed below. Could you provide
a tip for that?Thanks. Regards
Your search for restore
data from /var/lib/pgsql/
returned no hits.
Andrew
Hello!
This is a test mail for the list
pgsql-admin@xxxxxxxxxxxxxxxxxxxx
as requested. The mail has the
same list-id header
as email delivered to the list,
and can be used to
for example test local mail
filters.
--
--
Holger Jakobs, Bergisch Gladbach, Tel. +49-178-9759012
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