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Re: bloated postgres data folder, clean up - Mailing list pgsql-general

From Rémi Cura
Subject Re: bloated postgres data folder, clean up
Date
Msg-id CAJvUf_v23DWVbuKwqp3bSBhfa5P1wtKPh=x_3t1GcuDFYE3MWQ@mail.gmail.com
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In response to Re: bloated postgres data folder, clean up  (Johnny Morano <johnny.morano@payon.com>)
Responses Re: bloated postgres data folder, clean up  (Johnny Morano <johnny.morano@payon.com>)
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Hey,
this is quite the *opposite*.
The function find files in the postgres database folder that are not used by the database.

To use it :
 * connect to the database you want to analyse ( **mandatory** ).
 * create the function (execute function definition)
 * Execute `SELECT * FROM find_useless_postgres_file('your_database_name')`

This will output a list of files that are on the disk but not used by postgres,
and so can be removed.

To be extra sure, you should use oid2name programme to check that the useless files are really useless.


For this :
 * output the list of potential useless files with copy for instance
  ex :
  COPY ( SELECT file_name
         FROM find_useless_postgres_file('your_database_name')
   ) TO 'path_to_you_database_folder/potential_useless.txt'

   now you've got a file with a list of potential erroneous files.

 * Then use oid2name
  `$su postgres
   $cd path_to_you_database_folder
   $while read i; do oid2name -f "$i" -i -S -q -d your_database_name; done < potential_useless.txt
  `

  Nothing should show, meaning that every potential erroneous file
   has not been recognized by oid2name !
  If you feel unconvinced, you can manually try oid2name on some
   of the potential erroneous files, to be extra sure.
  It should not find anything.

 * Now delete all the files in `potential_useless.txt`.
  It could be wiser to not delete the files but rename those
  (for instance, adding `.potentially_useless` as a postfix)
  so if it breaks something, you have an easy way to revert everything.

Anyway, use *-*extra extra*-* caution if you delete.
Except a backup, there would be no easy way to correct a mistake.

Cheers,
Rémi-C

2016-03-02 15:38 GMT+01:00 Johnny Morano <johnny.morano@payon.com>:

Hi Remi!

 

This SQL function you have provided, seems to return all valid files, is that correct? In my case, it returned all my ‘base/’ files. Is that normal?

If yes, maybe you rename the function to ‘find_useful_postgres_files’ ;-)

 

Could you explain in steps how to use this function to make a cleanup of bloated data? (like in an example with commands and example output, if possible of course)

 

Thanks!

 

 

Mit besten Grüßen / With best regards,

Johnny Morano

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From: pgsql-general-owner@postgresql.org [mailto:pgsql-general-owner@postgresql.org] On Behalf Of Rémi Cura
Sent: Mittwoch, 2. März 2016 14:58
To: Alvaro Herrera
Cc: PostgreSQL General
Subject: Re: [GENERAL] bloated postgres data folder, clean up

 

Would gladly do it,

but still this "wiki cooloff" stuff,

can't create a page

Cheers,

Rémi-C

 

2016-02-29 20:44 GMT+01:00 Alvaro Herrera <alvherre@2ndquadrant.com>:

Rémi Cura wrote:
> Hey dear list,
> after a fex years of experiments and crash,
> I ended up with a grossly bloated postgres folder.
> I had about 8 Go of useless files.

Would you add a new page to the wiki with this?

https://wiki.postgresql.org/wiki/Category:Administrative_Snippets

--
Álvaro Herrera                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

 


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