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* Re: Backup
@ 2024-10-16 19:52 Tomas Vondra <[email protected]>
2024-10-16 20:32 ` Re: Backup Adrian Klaver <[email protected]>
0 siblings, 1 reply; 2+ messages in thread
From: Tomas Vondra @ 2024-10-16 19:52 UTC (permalink / raw)
To: Andy Hartman <[email protected]>; [email protected]
On 10/16/24 21:37, Andy Hartman wrote:
> I am very new to Postgres and have always worked in the mssql world. I'm
> looking for suggestions on DB backups. I currently have a DB used to
> store Historical information that has images it's currently around 100gig.
>
> I'm looking to take a monthly backup as I archive a month of data at a
> time. I am looking for it to be compressed and have a machine that has
> multiple cpu's and ample memory.
>
> Suggestions on things I can try ?
> I did a pg_dump using these parms
> --format=t --blobs lobarch
>
> it ran my device out of storage:
>
> pg_dump: error: could not write to output file: No space left on device
>
> I have 150gig free on my backup drive... can obviously add more
>
> looking for the quickest and smallest backup file output...
>
> Thanks again for help\suggestions
>
You didn't specify the Postgres version - that matters, because older
pg_dump versions (before PG 16) do not support compression. Since PG 16
you can use either -Fc or -Fd (instead of the tar format), and it'll
compress the output using gzip.
Alternatively, you can use --compress=method:level (the supported
methods depend on how the packages were built, no idea what platform
you're on etc.). See
https://www.postgresql.org/docs/current/app-pgdump.html
If you're on older version, you should be able to write the dump to
standard output, and compress that way. Something like
pg_dump -Fc | gzip -c > compressed.dump.gz
However, be aware that pg_dump is more an export tool than a backup
suitable for large databases / quick recovery. It won't allow doing PITR
and similar stuff.
regards
--
Tomas Vondra
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: Backup
2024-10-16 19:52 Re: Backup Tomas Vondra <[email protected]>
@ 2024-10-16 20:32 ` Adrian Klaver <[email protected]>
0 siblings, 0 replies; 2+ messages in thread
From: Adrian Klaver @ 2024-10-16 20:32 UTC (permalink / raw)
To: Tomas Vondra <[email protected]>; Andy Hartman <[email protected]>; [email protected]
On 10/16/24 12:52, Tomas Vondra wrote:
> On 10/16/24 21:37, Andy Hartman wrote:
>> I am very new to Postgres and have always worked in the mssql world. I'm
> You didn't specify the Postgres version - that matters, because older
> pg_dump versions (before PG 16) do not support compression. Since PG 16
> you can use either -Fc or -Fd (instead of the tar format), and it'll
> compress the output using gzip.
Oh, it goes back further then that:
https://www.postgresql.org/docs/7.1/app-pgdump.html
"-F format, --format=format
Format can be one of the following:
p
output a plain text SQL script file (default)
t
output a tar archive suitable for input into pg_restore. Using
this archive format allows reordering and/or exclusion of schema
elements at the time the database is restored. It is also possible to
limit which data is reloaded at restore time.
c
output a custom archive suitable for input into pg_restore.
This is the most flexible format in that it allows reordering of data
load as well as schema elements. This format is also compressed by default.
"
>
> Alternatively, you can use --compress=method:level (the supported
> methods depend on how the packages were built, no idea what platform
> you're on etc.). See
>
> https://www.postgresql.org/docs/current/app-pgdump.html
>
> If you're on older version, you should be able to write the dump to
> standard output, and compress that way. Something like
>
> pg_dump -Fc | gzip -c > compressed.dump.gz
>
> However, be aware that pg_dump is more an export tool than a backup
> suitable for large databases / quick recovery. It won't allow doing PITR
> and similar stuff.
>
>
> regards
>
--
Adrian Klaver
[email protected]
^ permalink raw reply [nested|flat] 2+ messages in thread
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2024-10-16 19:52 Re: Backup Tomas Vondra <[email protected]>
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