Re: Enterprise Manager warns of blocking on LGWR

From: Norman Dunbar <>
Date: Fri, 08 Dec 2017 09:16:30 +0000
Message-ID: <>

Morning Mladen,

> Furthermore, duplexing redo logs is completely unnecessary. Duplexing is done by the
> storage (RAID 1+0 or some other form of RAID) and it is unnecessary to waste the
> expensive server CPU and IO capacity to do the job that storage does anyway.


Not every company has the thought or foresight to RAID things plus, if somehow, someone deletes a RAIDed copy of a database file, the mirror will get deleted too, yes?

Be safe, duplex anyway, after all 'disc is cheap' as we are always told, and cpu isn't really a problem, especially if the disc controllers do it for you.

I've always duplexed redo and cintrol filrs, to separate discs, since I was a wee fledgling DBA - but I have to say that it did prove necessary, once only. Junior DBA deleted a file, luckily there was a duplex.


Sent from my Android device with K-9 Mail. Please excuse my brevity.
Received on Fri Dec 08 2017 - 10:16:30 CET

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