Hello Mischa,

[...]
>Second question:
>What is it good for having more than one "normal-not mirrored" logfile when
>u use automatic backup?

The automatic log backup starts to work if log_segment_size log pages were written to 
the log. In the default case this is after 1/3 used logsize and then only this 1/3 
logsize is backuped.
So you will loose log in case of a log volume damage and you can avoid this with a 
mirrored log.

>Third question:
>If u use automatic backup for the logfile and for example
>log_segment_size(ed) 3000 pages, what
>logfile size do u recommend?

The default calculation for log_segment_size is logsize/3 so if you have a preferred 
log_segment_size because it defines the log backup size (in online mode) as well then 
use 3*log_segment_size for the logsize.

If you set log_segment_size to 0 the default will be automatically calculated during 
param_checkall. Once the value is calculated it will not change automatically if you 
add additional log volumes.

Kind regards,
Uwe

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