Re: Enterprise Manager warns of blocking on LGWR

On Fri, 8 Dec 2017 14:47:58 -0800
Jared Still <jkstill_at_gmail.com> wrote:

>
> This is the same logic applied by using Normal or High redundancy in ASM;
> much more protection for your data than external redundancy can provide.
>
>
> Jared Still
> Certifiable Oracle DBA and Part Time Perl Evangelist
> Principal Consultant at Pythian

I beg to differ. A good SAN will do everything that high redundancy will do: create and synchronize additional copies of data. Good replication like EMC or Hitachi will even support geographically remote copy of the database, which would be a problem with ASM high redundancy. Basically, all those high redundancy features provide the same protection as a decent SAN. My impression is that those features are meant for the people with their databases on JBOD. As incredible as it may seem, such databases do exist. And if hardware is not providing the necessary redundancy, there is no other option but to use ASM redundancy and duplexed redo logs. Regards

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Mladen Gogala
Oracle DBA
Tel: (347) 321-1217
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