Re: Oracle Data Guard

> Hi All,
>
> can any one let me know kindly the following info.
>
> 1) Has any one used the Oracle 9i Data Guard?

Yes, physical standby and successfully.

> 2) If yes then, is there any performance impact on
> Target/Source server database.

Your database has to be in archivelog mode, but when you are thinking such solutions as DG, then you probably are already running archivelog anyway.

If you run in maximum protection or maximum availability, yes there is. The impact depends mainly on network connection between primary and standby(s) and the speed of redolog disks. You could tune these by using faster network, enabling jumbo frames and SDU size if using Gbit ethernet, also setting lgwr and log apply processes priority higher than others.

> 3) any drawbacks using Data Guard.

You should set your database or critical tablespaces to force logging mode in order to transfer all changes to standby in physical standby. That means, performance improvements which take advantage of nologging operations (such insert append nologging etc), will not run that fast anymore. In logical standby, I think there's no such requirement, but I don't recommend you to use logical stby yet, it's more like a prototype currently, not exactly a working product.

Tanel.

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Author: Tanel Poder
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