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Restore multiplexing of the controlfile

Scenarios:

  • restore of the multiplexing of the controlfile after a failure
  • additional controlfile multiplexing

Configuration:

  • Two diskgroups (1) +DBNAME_DATADG1 for db files and redo logs (Oacle-managed files) (2) +DBNAME_RECODG1 for the flash recovery area
  • The controlfile is mirrored/multiplexed in two copies one per diskgroup
  • The role of the two copies is not symmetrical: the first one is the primary copy, a loss of of the primary copy will quickly cause a crash of the (cluster) DB
  • The loss of a non-primary copy of the controlfile will not crash the DB immediately, but will require (cluster) downtime to fix it

How to restore a failed copy of the controlfile:

  • stop all instances
  • create pfile='/tmp/pfileDB' from spfile (use this to find the name of the failed controlfile copy)
  • start one instance in nomount
  • with rman (Example):
set DBID=....
 restore controlfile to '+DBNAME_RECODG1/DBANME/controlfile/current.258.614023949' 
 from '+DBNAME_DATADG1/DBNAME/controlfile/current.256.612033453';
  • startup the DB

If you have to add a copy of the controlfile:

  • typical scenario, after a controlfile copy failure the DB was reopened with only 1 copy, a maintenance is scheduled to restore full redundancy
  • same as above but (Example:)
    • restore controlfile to '+DBNAME_DATADG1' from '+DBNAME_RECODG1/DBANME/controlfile/current.258.614023949'
    • use ASMCMD to find the name of the controlfile copy generated above and edit the spfile accordingly

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Topic revision: r2 - 2007-03-05 - LucaCanali
 
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