Re: [PERFORM] How Can I check PostgreSQL backup is successfully ornot ?

Hi,

I run the below command
[postgres@CPPMoma-DB05 bin]$ pg_dump -U postgres  moma_ts_oce; echo $

Output was like this(Last few lines )
------------------------------
-- Name: public; Type: ACL; Schema: -; Owner: postgres
--

REVOKE ALL ON SCHEMA public FROM PUBLIC;
REVOKE ALL ON SCHEMA public FROM postgres;
GRANT ALL ON SCHEMA public TO postgres;
GRANT ALL ON SCHEMA public TO PUBLIC;

--
-- PostgreSQL database dump complete
--

$

Regards,
Dinesh Chandra
|Database administrator (Oracle/PostgreSQL)| Cyient Ltd. Noida.
------------------------------------------------------------------
Mobile: +91-9953975849 | Ext 1078 |dinesh.chandra@cyient.com
Plot No. 7, NSEZ, Phase-II ,Noida-Dadri Road, Noida - 201 305,India.

-----Original Message-----
From: vinny [mailto:vinny@xs4all.nl]
Sent: 27 February, 2017 7:31 PM
To: John Gorman <jgorman@eldocomp.com>
Cc: Rick Otten <rottenwindfish@gmail.com>; Dinesh Chandra 12108 <Dinesh.Chandra@cyient.com>;
pgsql-performance@postgresql.org;pgsql-performance-owner@postgresql.org
 
Subject: Re: [PERFORM] How Can I check PostgreSQL backup is successfully or not ?

On 2017-02-27 14:29, John Gorman wrote:
> Even though it's not listed in any of the documentation or “pg_dump
> --help” you can check the return code of the process. A return code
> greater than 0 (zero) usually indicates a failure
>
> ./bin >pg_dump -U dummy_user  dummy_database; echo $?
>
> 1
>
> FROM: pgsql-performance-owner@postgresql.org
> [mailto:pgsql-performance-owner@postgresql.org] ON BEHALF OF Rick
> Otten
> SENT: Monday, February 27, 2017 3:36 AM
> TO: Dinesh Chandra 12108
> CC: pgsql-performance@postgresql.org
> SUBJECT: Re: [PERFORM] How Can I check PostgreSQL backup is
> successfully or not ?
>
> Although it doesn't really tell if the pg_dump was successful (you'll
> need to do a full restore to be sure), I generate an archive list.  If
> that fails, the backup clearly wasn't successful, and if it succeeds,
> odds are pretty good that it worked:
>
> On Mon, Feb 27, 2017 at 4:35 AM, Dinesh Chandra 12108
> <Dinesh.Chandra@cyient.com> wrote:
>
> Hi,
>
> We are taking daily full backup of PostgreSQL database using PG_DUMP
> which is automatic scheduled through Cronjobs.
>
> How can I check my yesterday backup is successfully or not?
>
> Is there any query or view by which I can check it?
>
> REGARDS,
>
> DINESH CHANDRA
>
> |DATABASE ADMINISTRATOR (ORACLE/POSTGRESQL)| CYIENT LTD. NOIDA.


It's important to note the distinction between

"the backup process did not fail"

and

"we now have a trustworthy backup"

And you can go full-paranoia and say that you can successfully create a perfectly working backup of the wrong
database.

So what is it that you want to make sure of:
1. Did the process give an error?
2. Did the process create a usable backup?

What are the chances of #1 reporting success but still producing a bad backup?
And can #2 fail on a good database, and if so, can you detect that?



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