Re: standby redologs ?!!
- From: "ZhangLeyi (Kamus)" <kamusis@xxxxxxxxx>
- To: premj@xxxxxxxxxxxxxx
- Date: Mon, 26 Sep 2011 11:32:01 +0800
Hi Prem
Incase has no enough time to transfer the redo data from primary to
standby, plus 1 is more reliable.
But ... in the real world, if you have network issue, plus 1 will not do
any help, and if you have perfect network, actually only 1 or 2 standby
redo log will be used on the standby site.
So ... IMOHO, you can safely ignore it.
Prem wrote:
> Friends ,
> I have a question (sorry if I sound too naive) .
>
> 11gR2 manuals say : "The standby redo log must have at least one more redo
> log group than the redo log at the redo source database, for each redo thread
> at the redo source database."
>
> It means - we need 3 standby redo log groups on the standby db if there are 2
> redo log groups on the primary db . why so ? what is the purpose of that one
> extra group ?
>
> Regards,
> ~ JP ~
>
>
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>
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Zhang Leyi (Kamus) <kamusis@xxxxxxxxx>
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