Re: pgbasebackup is failing after truncate

On 08/10/2016 11:06 PM, Yelai, Ramkumar wrote:
> HI
>
> At present, I have some requirement to truncate the data base  to
> reclaim disk space and at the same time I need to take basebackup.

To be clear you ran TRUNCATE on tables within the database, correct?

If not what was the actual command you used?

>
> Seems, truncate is successfully reclaimed the space but pgbasebackup
> failed and reported the below error.
>
> “could not stat file or directory ./base/16384/25600: Permission denied.

So what user did you run pg_basebackup  as and does that user have
rights on that file/directory?

>
> Further observation shows that truncate command reclaiming the space by
> making empty (not deleted)  these files in ./base/16384 folders.
>
> Seems these filename are relfilenode in pg_class table to map filename
> to table name. Since truncate making empty these files and create new
> files to map the old table name, pgbasebackup is unable to synch with
> truncate and pointing to old files.
>
> Also, the old files are not deleted from “base” folder.
>
> Please let me know how to resolve this issue
>
> With best regards,
> Ramkumar Yelai
>
> _mailto:ramkumar.yelai@siemens.com_
> _http://www.siemens.co.in/STS_
>
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>


--
Adrian Klaver
adrian.klaver@aklaver.com