>
> > > I thought we decided that file descriptors are kept by
> backends, and are
> > > still accessable while new backends don't see the files. Correct?
> > >
> >
> > Yes,other backends could write to unliked files which would be
> > vanished before long.
> > I think it's more secure to truncate useless segments to size 0
> > than unlinking the segments though vacuum would never remove
> > useless segments.
>
> If you truncate, other backends will see the data gone, and will be
> writing into the middle of an empty file. Better to remove.
>
I couldn't explain more because of my poor English,sorry.
But my test case usually causes backend abort.
My test case isWhile 1 or more sessions frequently insert/update a table,vacuum the table.
After vacuum, those sessions abort with message ERROR: cannot open segment .. of relation ...
This ERROR finally causes spinlock freeze as I reported in a posting
[HACKERS] spinlock freeze ?(Re: INSERT/UPDATE waiting (another
example)).
Comments ?
Thanks.
Hiroshi Inoue
Inoue@tpf.co.jp
