> I am not sure on the exact semantics of the 4.6.4 engine, but in any
> case you
> need to limit concurrency (and thus speed) as much as possible. If you
> really
> need sequence, that means you need to run it on a single thread (with
> a
> direct mode main queue). The defaults look like they "preserve
> sequence", and
> you will see the inevitable out of sequence only when heavy traffic
> occurs.
> 
> However, any approach to trying to "preserve sequence" will not work
> if
> looked at closely enough, so there is nothing that can be preseverd.
> Details
> are in my Linux Kongress paper:
> 
> http://blog.gerhards.net/2010/10/linux-kongress-2010-rsyslog-paper.html
> 

Thanks Rainer. Interesting. I read chapter 7 about concurrency optimization.

What I am looking for is indeed what is described there: preserved timestamp 
order. And this only with some restrictions:
* in time windows within few seconds or so 
  because those message will be processed with the need of chronological order.
* only per system

Of course there might be corner cases where this will not always work but this
will then be only due to a system outage or something like that.

I am now going to try 5.6.0 with omruleset. I hope it will work
then.

Are there any config options to control or affect timestamp ordering?

In my case I guess it would be sufficient if only one thread would feed the
database.

TIA
-Marc
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