Re: DataMirror - Control Groups

[Mike Berman <mikeba777@xxxxxxxxx>]

Yes A hearty Thank you Oliver!

oliver.wenzel@xxxxxxxxxxxxxxxxxxxxxxx wrote:Hello,

>In DataMirror, I am interested in an explanation of what Control groups 
are, why they seem to take a while to maintain on a daily basis.

Groups are mainly for that, grouping similar libraries and objects 
together. Each group has its own journal, so you can start/end 
groups seperately. Sometimes, when there is a problem in a group, the 
apply job stops doing its job, but only for that group. If 
you put all objects in one big group, all data replication will stop until 
you have fixed the problem.

We have mainly grouped by application, which was very good in the 
beginning. Journalling our EDI application was a big strain on
system performance, and we were happy to be able to turn off the EDI 
group, but the other groups where still mirrored.

One more point, each group has its own apply job (that does the 
mirroring), so if you put too much strain on that job (too many objects),
your apply might lag behind.

I hope this clears it up somewhat.


Regards,

Oliver
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