He is one of the most respected guys in the Israel oracle community. Adar Yechiel Rechovot, Israel LS Cheng wrote:
Was the lecturer a pure lecturer or lecturer/consultant?Academic stuffs sounds very good always but us we live in real worlds and work with real applications.Regards -- LSCOn Tue, Nov 25, 2008 at 5:05 PM, Yechiel Adar <adar666@xxxxxxxxxxxx <mailto:adar666@xxxxxxxxxxxx>> wrote:I was in a stream class today and the lecturer mentioned just this thing. Create a second database and create bi-directional streams between the two. 1) bring the application down for a minute or two. 2) change the application to access the second server. 3) bring down the first database. 4) bring up the application. It will start to put updates in the queues in the second database. 5) upgrade the first database. 6) bring up the first database and wait for the apply process to catch up. 7) bring down the application for a minute or two. 8) point the application to the first database. 9) start up the application. Upgrade completed with only a few minutes down time. Need EE for streams and works best in 10.2.0.4 <http://10.2.0.4>. Adar Yechiel Rechovot, Israel Martin Berger wrote:Hi Keith, I have to second Carels and Michaels meanings. Your desire is highly complex and multi dimensional. So you will not get any straight forward answer. In one of my prior lives I had to promote and support Multi Master Replication. If someone uses this wise, he can achieve azero-downtime environment. But be warned: You need a tremendous engineering work and stillreally good skilled operational DBAs with enough time to take care of. I have never checked, wether or not streams can provide the same functionality. Maybe it's worth checking. just some ideas, might they help, Martin --Martin Berger http://berxblog.blogspot.comHi, I'm working with a customer running a critical web site on a 10gR2 RAC backend DB - they support hundreds of thousands ofsimultaneous connections at the "quietest" time. They have expressed a desire for NO downtime during ANY changesto Oracle, particularly the application of Oracle patches andOracle upgrades (both minor and major), etc. Any thoughts? Who's "been there done that"?