Re: archive wal's failure and load increase.

[Simon Riggs <simon(at)2ndquadrant(dot)com>]

On Fri, 2006-09-29 at 10:29 -0400, Tom Lane wrote:
> Simon Riggs <simon(at)2ndquadrant(dot)com> writes:
> > We discussed putting PreallocXlogFiles() in bgwriter once before, but I
> > think last time we discussed that idea it was rejected, IIRC.
> 
> We already do that: it's called a checkpoint.  

Yes, but not enough.

PreallocXlogFiles() adds only a *single* xlog file, sometimes.

On a busy system, that would be used up too quickly to make a
difference. After that the effect of adding new files would continue as
suggested.

If it did add more than one... it might work better for this case.

> It's a good thought but I don't think the theory holds water for
> explaining Cedric's problem, unless there was *also* some effect
> preventing checkpoints from completing ... which would be a much more
> serious problem than the archiver failing.

Still the best explanation for me.

-- 
  Simon Riggs             
  EnterpriseDB   http://www.enterprisedb.com