Recovering Server Parameter File

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Recovering server parameter file

If the Server Parameter file is lost or corrupted , the next startup of the instance may fail . There is chance of the failure of the current instance as well.

The following are the common reasons for the corruption or loss of the spfile

  • Accidental deletion
  • Editing spfile using text editors

in this document , we will disucss on  two situations of recovering  server parameter file or spfile

  1.  When the database up and running , that is using the information from memory
  2. Using the text based parameter file

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Steps For Recovering server parameter file or spfile

Use the following steps to recovering server parameter file or spfile

Please note : Whenever RMAN backup the controlfile  , the spfile is automatically   backed up along with controlfile

The control is automatically backed up in the following situations

  • When the full back is taken place
  • When the system datafile is backed up
  • On all backup commands , if the controlfile auto backup is enabled

More Reading

Recreate  using the values in memory:

If the instance is running, issue the following command to recreate the SPFILE from the current values of initialization parameters in memory:

SQL> create spfile from memory

Recreate  using the pfile:

SQL> create spfile from pfile;

Restore spfile from RMAN Backup:

RMAN> restore spfile from autobackup

or

RMAN> restore spfile from backuppiece

Imp :  We will discuss more on RMAN steps to restore the spfile   in this document

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