Re: Which HA Solution allows to have least downtime while having oracle upgrades/patches

Hi Jensen,

Thanks a lot for the response and information. I am just wondering how are the major online sites such as Amazon.com, ebay and so on are being maintained to minimize downtime during such software maintenance. Don't know what kind of HA solution they are using.

Thanks
CP

Svend Jensen wrote:
> Simple, no HA solution allows for zero downtime while upgrading,
> patching and so forth.
> A matter of fact: more complexity => more dependency => more downtime.
> Simplicity is beatifull (and fast).
>
> Pick a simple solution, and you have more uptime.
>
> My personal favour is (delayed) hot standby on identical systems.
>
> rgds
> /Svend Jensen
>
>
> CP wrote:
>

>> Hi Gurus,
>>
>> Among available Oracle HA solutions - Datagurd, Replication, RAC which 
>> solution really allows to have minimum downtime or permit rolling 
>> upgrades of Oracle software or allow patching oracle software. I tried 
>> to figure out the same by going through couple of oracle documents, 
>> but failed to get a clear idea on this issue.
>>
>>
>> Please help me with any ideas or thoughts on this.
>>
>> Thanks
>> Chandra
>>
>>
>>
>>
>>