Re: San-Based replication VS DataGuard replication

From: hpuxrac <>
Date: Thu, 2 Oct 2008 15:23:32 -0700 (PDT)
Message-ID: <>

On Oct 1, 3:13 pm, macdba321 <> wrote:


> Thank you all for the great input.
> In the last post, can you elaborate on #2? Regarding how dataguard can
> guarantee zero data loss if it is configured for maximum protection.
> (Essentially, the final transaction would not go through if the
> primary database can not get the confirmation back.) However, can you
> elaborate on your statement:  "You can not make SAN replication
> synchronous." ??

Almost all of the ( probably all ? ) of the major storage vendors support storage based replication technologies in both synchronous or asynchronous modes.

Synchronous replication carries a performance hit that you will see in events like "log file sync" varies somewhat in impact depending on volume and how commit intensive applications are.

There is absolutely no sense in the statement "You can not make SAN replication synchronous" sounds like either someone that doesn't have relevant experience or perhaps meant something else unrelated to storage based replication between multiple sites. Received on Thu Oct 02 2008 - 17:23:32 CDT

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