I actually just went through an implementation of Data Guard here and ran into issues with archive logs to multiple destinations, and even though dest_2 was set for optional, it still slowed down the production side because of an extremely slow WAN connection. We are running 9i and found that there is an underscore parameter that can be set in 18.104.22.168 and later that is default in 10g. The parameter is _LOG_ARCHIVE_CALLOUT='LOCAL_FIRST=TRUE'. This tells Oracle to write the local log first and then do the secondary destination no matter how long the write takes. The problem with a slow network is that the log is still writable so the Optional part of the destination does not come into play. Optional only works if the destination is unreachable. You can read more on Metalink Note: 260040.1 Todd Sheetz Database Administrator American Transmission Company ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Gogala, Mladen Sent: Wednesday, October 05, 2005 8:58 AM To: 'zhuchao@xxxxxxxxx'; Mladen Gogala Cc: David Sharples; peterdixon001@xxxxxxxxxxx; oracle-l@xxxxxxxxxxxxx Subject: RE: resync In this case it is. I have a RAC database on Solaris and I am maintaining two standby instances: one physical and one logical. The latter one is called "reporting database". I've had all kinds of network calamities but my primary database was never hung. If you have different experience, let's hear it, documented with OS and DB versions and the exact description. I cannot accept patronizing tone on its own, without any additional arguments. In addition to that, to know how oracle works it is sometimes, just sometimes, advisable to read the documentation. -- Mladen Gogala Ext. 121 ________________________________ From: zhu chao [mailto:zhuchao@xxxxxxxxx] Sent: Wednesday, October 05, 2005 8:27 AM To: Mladen Gogala Cc: David Sharples; peterdixon001@xxxxxxxxxxx; oracle-l@xxxxxxxxxxxxx Subject: Re: resync Hi, Gogala, Oracle is not always working as documented, you know:). We did configure optional, and primary database archive process did hang and locked that redo log on primary. I have seen several cases like that.