<readOnlyIfYouWantToKnowAboutAProductThatReallyScales>
"Jonathan K. Weedon" wrote:
>
> It seems that the conversation about scalability is proceeding along rather
> well. Originally, I opened with some very strong statements about how
> certain appservers would have trouble scaling on certain databases.
>
> The conversation has proceeded on its own, and a number of the facts that
> lead to my original statement have been corroborated, independently. Let's
> review those facts.
>
> 1) Some products do not support a "tuned" and "verified" update mechanism
> in their CMP engines, which is needed to support optimistic concurrency in
> the appserver.
>
> ... [Lots of convincing arguments why tuned and verified updates are
> valuable for scalability]
I couldn't agree with you more. And, by the way:
<vendor>
Tuned (and verified) updates are the default behaviour with the CMP engine in
Sybase EAServer 3.6.1.
</vendor>
(I couldn't have everyone thinking that Borland AppServer is the only one that
scales. You do have an excellent product and are to be complimented for that).
One day I need to write a message to the list explaining in detail why the lack
of entity bean object caching (integrated with OCC) is a scalability issue, and
thereby why it will be useful to have not just tuned and verified updates, but
also to have a cluster-aware entity bean object cache to prevent unnecessary
database 'select' statements, which will work (with some caveats) even in the
presense of external updates to the database.
Sound interesting?
<vendor>
Check out Sybase EAServer 4.0 (in beta any day now). Try out the Object Cache.
Find out for yourself how well this scales compared to other vendors' offerings.
Then sit back and watch the other vendors scrambling to play catch-up.
</vendor>
</readOnlyIfYouWantToKnowAboutAProductThatReallyScales>
________________________________________________________________________________
Evan Ireland Sybase EAServer Engineering [EMAIL PROTECTED]
Wellington, New Zealand +64 4 934-5856
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