Thank you all, I thought there may be a specific posgresql stored procedure
that did the work of enumerating the files of the pg_xlog directory to get
its full  size, or may be one that gave the full size of the server
databases including pg_xlog.
Nevermind, this does the work.

Regards,
Sylvain
‚Äč

2016-09-22 16:05 GMT+02:00 hubert depesz lubaczewski <dep...@depesz.com>:

> On Thu, Sep 22, 2016 at 02:23:20PM +0200, Sylvain Marechal wrote:
> > is there a way to monitor the size of the pg_xlog directory in SQL? The
>
> Assuming you have superuser privileges, it will most likely work:
>
> select sum( (f).size ) from (select pg_stat_file('pg_xlog/' || pg_ls_dir)
> as f from pg_ls_dir('pg_xlog/')) x where not (f).isdir;
>
> Best regards,
>
> depesz
>
>

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