Strange mount/unmount diskgroup

From: Mladen Gogala <mgogala_at_vmsinfo.com>
Date: Sun, 18 Feb 2007 17:57:57 -0500
Message-ID: <45D8D9F5.7010408@vmsinfo.com>

I have a RAC database with a standby. Both RAC and standby are on ASM. On standby,
I used the flashback recovery area located on the DGFRA diskgroup to create standby redo
logs. There aren't any problems but I am perplexed by entries like this:

RFS[1]: Successfully opened standby log 30: '+DGFRA/adprd/onlinelog/group_30.265.614877861'

SUCCESS: diskgroup DGFRA was dismounted
SUCCESS: diskgroup DGFRA was mounted
SUCCESS: diskgroup DGFRA was dismounted

Sun Feb 18 17:51:50 2007

SUCCESS: diskgroup DGFRA was mounted
SUCCESS: diskgroup DGFRA was dismounted
SUCCESS: diskgroup DGFRA was mounted
SUCCESS: diskgroup DGFRA was dismounted

Sun Feb 18 17:51:52 2007

Media Recovery Log /BACKUP/archives/archADPRD_1_514_614435904.dbf
Media Recovery Log /BACKUP/archives/archADPRD_1_515_614435904.dbf
Media Recovery Log /BACKUP/archives/archADPRD_2_863_614435904.dbf
Media Recovery Log /BACKUP/archives/archADPRD_1_516_614435904.dbf
Media Recovery Log /BACKUP/archives/archADPRD_2_864_614435904.dbf

Media Recovery Waiting for thread 1 sequence 517

Why in the world is it unmounting/mounting the diskgroup? What useful purpose does it serve and why
doesn't the instance just leave it mounted?

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Received on Sun Feb 18 2007 - 16:57:57 CST