Check out Metalink Doc ID: 386417.1 Dick Goulet Senior Oracle DBA PAREXEL International ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Charles Schultz Sent: Friday, June 05, 2009 12:57 PM To: ORACLE-L Subject: Requesting a RFS walkthrough Good day, list, I am curious if someone would be able to divulge some of the under pinnings of RFS. The snippet below is from our alert.log on the standby; this is one of two 10.2.0.2 physical standby databases with no DB Broker using real-time apply, and we have been seeing this situation happen more and more often. Our networking group tells us there are no issues with the infrastructure, so I am struggling to understand why this happening. My basic understanding of RFS explains the situation like so: * At 10:45:02, the heartbeat process attempts to talk to Primary but is unable to. I assume there are two similar messages because we have two FAL_SERVERS, but I could be way off in that. * The next few verbose messages show a connection being reestablished with the primary. * At 10:45:20, FAL attempts to get logseq 6045. Why does it fail? The log was archived on the Primary at 10:45:15 (v$archived_log.completion_time). * It fails again at 10:45:55, but succeeds at 10:45:56. Why? Fri Jun 5 10:45:02 2009 RFS[143]: Possible network disconnect with primary database Fri Jun 5 10:45:05 2009 RFS[144]: Possible network disconnect with primary database Fri Jun 5 10:45:15 2009 RFS[142]: Successfully opened standby log 22: '+DATA/gcprod/onlinelog/group_22.352.633713051' Fri Jun 5 10:45:15 2009 RFS[139]: Successfully opened standby log 25: '+DATA/gcprod/onlinelog/group_25.262.633713253' Fri Jun 5 10:45:16 2009 Redo Shipping Client Connected as PUBLIC -- Connected User is Valid RFS[147]: Assigned to RFS process 18916 RFS[147]: Identified database type as 'physical standby' Primary database is in MAXIMUM PERFORMANCE mode Primary database is in MAXIMUM PERFORMANCE mode Fri Jun 5 10:45:16 2009 Redo Shipping Client Connected as PUBLIC -- Connected User is Valid RFS[148]: Assigned to RFS process 18918 RFS[148]: Identified database type as 'physical standby' Primary database is in MAXIMUM PERFORMANCE mode Fri Jun 5 10:45:16 2009 RFS[147]: Successfully opened standby log 21: '+DATA/gcprod/onlinelog/group_21.351.633713041' Fri Jun 5 10:45:16 2009 Primary database is in MAXIMUM PERFORMANCE mode RFS[148]: Successfully opened standby log 24: '+DATA/gcprod/onlinelog/group_24.282.633713233' Fri Jun 5 10:45:20 2009 Fetching gap sequence in thread 1, gap sequence 6045-6045 FAL[client]: Error fetching gap sequence, no FAL server specified Fri Jun 5 10:45:55 2009 FAL[client]: Failed to request gap sequence GAP - thread 1 sequence 6045-6045 DBID 1222165961 branch 631792716 FAL[client]: All defined FAL servers have been attempted. ------------------------------------------------------------- Check that the CONTROL_FILE_RECORD_KEEP_TIME initialization parameter is defined to a value that is sufficiently large enough to maintain adequate log switch information to resolve archivelog gaps. ------------------------------------------------------------- Fri Jun 5 10:45:56 2009 RFS[145]: Archived Log: '+FRA/gcprod/archivelog/1_6045_631792716.dbf' Fri Jun 5 10:46:30 2009 Media Recovery Log +FRA/gcprod/archivelog/1_6045_631792716.dbf -- Charles Schultz