[om-list] DCNs and Caching database proxies

[om-list at onemodel.org]

I'm catching up on old-old email. Sorry for all my delays...

I probably (I know I would, if possible) configured the email list to 
not show the from address, because the messages are posted publicly and 
that encourages spam. I can't keep my own off (as site admin) so I get 
the spam, but this is to spare the rest of you, if possible (if memory 
serves).

om-list at onemodel.org wrote:

> After some further consideration, I realized that the propagation 

> latency and lack of transaction metadata could make a general purpose 

> transparent proxy impractical with the current support from Oracle.  

> Without transaction tagging, you cannot guarantee clients a clean 

> snapshot when you mix cached data with new data.

> 

> Oracle has a capability called "flashback queries" that allow you to 

> query an earlier virtual snapshot of the database, identified by system 

> change number (SCN) or timestamp.  If you knew the SCNs of arriving 

> change notifications, you could get completely consistent data, delayed 

> a second or two.  That is too long for transparent OLTP caching, but 

> adequate for a large class of web and decision support applications.

> 

> - Mark

> 

> 

> [Luke, why doesn't the mailing list preserve the from address on each 

> posting?]

> 

> 

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