Oracle Local Registry

In Oracle Clusterware 12c, each node in a cluster has a local registry for node-specific resources, called an Oracle Local Registry (OLR), that is installed and configured when Oracle Clusterware installs OCR. Multiple processes on each node have simultaneous read and write access to the OLR particular to the node on which they reside, regardless of whether Oracle Clusterware is running or fully functional.

By default, OLR is located at Grid_home/cdata/host_name.olr on each node.

Manage OLR using the OCRCHECK, OCRDUMP, and OCRCONFIG utilities as root with the -local option.

• You can check the status of OLR on the local node using the OCRCHECK utility, as follows:

  # ocrcheck -local
  
  Status of Oracle Cluster Registry is as follows :
          Version                  :          3
          Total space (kbytes)     :     262132
          Used space (kbytes)      :       9200
          Available space (kbytes) :     252932
          ID                       :  604793089
          Device/File Name         : /private2/crs/cdata/localhost/dglnx6.olr
                                     Device/File integrity check succeeded
  
          Local OCR integrity check succeeded
  

• You can display the content of OLR on the local node to the text terminal that initiated the program using the OCRDUMP utility, as follows:

  # ocrdump -local -stdout
  

• You can perform administrative tasks on OLR on the local node using the OCRCONFIG utility.

  • To export OLR to a file:

    # ocrconfig –local –export file_name

    Note:

    • Oracle recommends that you use the -manualbackup and -restore commands and not the -import and -export commands.

    • When exporting OLR, Oracle recommends including "olr", the host name, and the timestamp in the name string. For example:

      olr_myhost1_20090603_0130_export

  • To import a specified file to OLR:

    # ocrconfig –local –import file_name
    

  • To manually back up OLR:

    # ocrconfig –local –manualbackup

    Note:

    The OLR is backed up after an installation or an upgrade. After that time, you can only manually back up the OLR. Automatic backups are not supported for the OLR. You should create a new backup when you migrate OCR from Oracle ASM to other storage, or when you migrate OCR from other storage to Oracle ASM.

    The default backup ___location for the OLR is in the path Grid_home/cdata/host_name.

  • To view the contents of the OLR backup file:

    ocrdump -local -backupfile olr_backup_file_name
    

  • To change the OLR backup ___location:

    ocrconfig -local -backuploc new_olr_backup_path
    

  • To restore OLR:

    # crsctl stop crs
    # ocrconfig -local -restore file_name
    # ocrcheck -local
    # crsctl start crs
    $ cluvfy comp olr