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Can you explain why DBWR was holding these files and we can avoid it?

edited Oct 23, 2009 7:03AM in Database Administration (MOSC) 1 commentAnswered
 We restored from backup Read Only and offline datafiles. We didn’t do anything with this files, only backup them to new tapes.
But DBWR processes got and was holding these files.

# fuser /dev/vx/rdsk/ICN/volumes_arc_049_01
/dev/vx/rdsk/ICN/volumes_arc_049_01:    27033o
# ptree 27033
27033 ora_dbw0_icn
# fuser  /dev/vx/rdsk/ICN/volumes_arc_049_02
/dev/vx/rdsk/ICN/volumes_arc_049_02:    27033o
# fuser /dev/vx/rdsk/ICN/events_arc_035_01
/dev/vx/rdsk/ICN/events_arc_035_01:    27033o

Can you explain why DBWR was holding these files and we can avoid it?

It’s problem for us because we can’t unmount this device.

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