A new type of replication, Supplementary Instance (SI) 
replication, allows replication to a supplementary instance which can 
execute its own business logic and commit database updates, to provide 
reporting, decision support, data warehousing, auditing, and more - 
all in real time.  A technical bulletin is at 
http://tinco.pair.com/bhaskar/gtm/doc/articles/GTM_Supplementary_Inst... 

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