Hi Paul, Is the connection between your sites pushed to the limits? You can use ssh, with compression and port forwarding, to get the redo info compressed. It's described in http://metalink.oracle.com/metalink/plsql/showdoc?db=NOT&id=225633.1&blackframe=0 (note 225633.1). Depends on the DG-method used. SSH/port forwarding won't bring you much improvement using LGWR SYNC, but can do so significantly in ARCH ASYNC mode. I'm sorry , I don't know the Double-Take stuff you described. What I would take into consideration is how to verify and monitor that the standby system actually gets synchronised, and what time instatiation takes. Is switchover possible? Otherwise a failover for switchover puposes might take a lot of time for re-instantiation, resulting in longer vulnerable periods with only one database available. Regards, Carel-Jan At 05:22 PM 1/23/2004, you wrote: >We're setting up a Data Guard physical standby here at our office; the >primary database is at a colocation facility about 100 miles away, with >a T1 currently providing networking between the two sites. The T1 is >inadequate to keep up with the rate of redo generation during batch >operations (like imports) on the primary. > >Our IT suggested that I look at NSI's Double-Take, which claims to >replicate only byte-by-byte changes, and to support Oracle. I have two >questions for anyone who's used or considered using this product: > >1. Does Double-Take appreciably reduce network traffic compared to >Data Guard physical standby? >2. Does Double-Take work reliably with Oracle? Does Oracle support a >database that is replicated using this product? > >TIA > > > >===== >Paul Baumgartel >Transcentive, Inc. >www.transcentive.com > >__________________________________ >Do you Yahoo!? >Yahoo! SiteBuilder - Free web site building tool. Try it! >http://webhosting.yahoo.com/ps/sb/ === If you think education is expensive, try ignorance. (Derek Bok) === DBA!ert, Independent Oracle Consultancy Kastanjelaan 61C 2743 BX Waddinxveen The Netherlands tel. +31 (0) 182 640 428 fax +31 (0) 182 640 429 mobile +31 (0) 653 911 950 e-mail info.dbalert@xxxxxxxxx