RMAN Recovery Scenario -Datafile Lost or Datafile Corrupt - How to restore & Recover the Datafile?

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  • čas přidán 24. 07. 2024
  • Only one data file is lost or corrupted
    SCENARIO-1: DATABASE IS NOT OPEN
    SCENARIO-2: DATABASE IS OPEN
    CASE 1: Datafile image copy from FRA
    CASE 2: Datafile restore from backup
    SCENARIO-1: DATABASE IS NOT OPEN
    ===========
    startup mount;
    rman taregt /
    list backup;
    restore datafile 4;
    recover datafile 4;
    alter database open;
    SCENARIO-2: DATABASE IS OPEN
    ==========
    CASE 1: Datafile image copy from FRA
    ==============================
    report schema;
    list copy of datafile 4;
    --- backup as copy database tag 'FullImageBackup';
    sql ‘alter database datafile 4 offline’;
    switch datafile 4 to copy;
    recover datafile 4;
    sql ‘alter database datafile 4 online’;
    report schema;
    cd /u01/app/oracle/oradata/DEVDB/
    mv users01.dbf users01.dbf_backup
    backup as copy datafile 4 format ‘/u01/app/oracle/oradata/DEVDB/users01.dbf’;
    sql ‘alter database datafile 4 offline’;
    switch datafile 4 to copy;
    recover datafile 4;
    sql ‘alter database datafile 4 online’;
    report schema;
    CASE 2: Datafile restore from backup
    ====================================
    rman target /
    sql “alter database datafile ”/u01/app/oracle/oradata/DEVDB/users01.dbf” offline”;
    restore datafile '/u01/app/oracle/oradata/DEVDB/users01.dbf';
    recover datafile '/u01/app/oracle/oradata/DEVDB/users01.dbf';
    sql “alter database datafile ”/u01/app/oracle/oradata/DEVDB/users01.dbf” online”;
    select file_name from dba_data_files;
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