在手工xtts时，增量应用时，执行如下脚本，会报ORA-19609: /home/ora11204/xtts/rmancopyincr/xtts_incr_05u9u9dh_1_1_conv_1 is from different backup set: stamp 1017062833 count 5的错误，请帮忙分析下原因？

以下为执行过程：

增量备份：

alter system checkpoint;

select current_scn from v$database;  -- 1025757

rman target / <<EOF

run{

allocate channel c1 type disk ;

set until scn=1025757;

backup incremental from scn 1025586 datafile  5,6 format '/home/ora11201/xtts/rmancopyincr/xtts_incr_%U';

release channel c1;

}

EOF

转换：

more incr.sql

set serveroutput on;

set termout      on;

set verify      off;

DECLARE

  handle varchar2(512) ;

  comment varchar2(80) ;

  media varchar2(80) ;

  concur boolean ;

  recid number ;

  stamp number ;

  platfrmto number;

  devtype VARCHAR2(512);

BEGIN

   BEGIN

      sys.dbms_backup_restore.restoreCancel(TRUE);

      devtype := sys.dbms_backup_restore.deviceAllocate; 

      sys.dbms_backup_restore.backupBackupPiece(

        bpname => '/home/ora11204/xtts/rmancopyincr/xtts_incr_05u9u9dh_1_1',

        fname => '/home/ora11204/xtts/rmancopyincr/xtts_incr_05u9u9dh_1_1_conv_1',

        handle => handle, media => media, comment => comment, 

        concur => concur, recid => recid, stamp => stamp, check_logical => FALSE,

        copyno => 1, deffmt => 0, copy_recid => 0, copy_stamp => 0,

        npieces => 1, dest => 0,

        pltfrmfr => 13);

  sys.dbms_backup_restore.backupBackupPiece(

        bpname => '/home/ora11204/xtts/rmancopyincr/xtts_incr_06u9u9do_1_1',

        fname => '/home/ora11204/xtts/rmancopyincr/xtts_incr_06u9u9do_1_1_conv_1',

        handle => handle, media => media, comment => comment, 

        concur => concur, recid => recid, stamp => stamp, check_logical => FALSE,

        copyno => 1, deffmt => 0, copy_recid => 0, copy_stamp => 0,

        npieces => 1, dest => 0,

        pltfrmfr => 13);

   EXCEPTION

      WHEN OTHERS

      THEN

        DBMS_OUTPUT.put_line ('ERROR IN CONVERSION ' || SQLERRM);

   END ;

   sys.dbms_backup_restore.deviceDeallocate;

END;

/

exit

$ sqlplus / as sysdba 

@incr.sql

增量应用：

ora11204*o11204-/home/ora11204/xtts/rmancopyincr>$more incr_apply.sql 

   set serveroutput on;

   DECLARE

   outhandle varchar2(512) ;

   outtag varchar2(30) ;

   done boolean ;

   failover boolean ;

   devtype VARCHAR2(512);

   BEGIN

   DBMS_OUTPUT.put_line('Entering RollForward');

   -- Now the rolling forward.

   devtype := sys.dbms_backup_restore.deviceAllocate;

   sys.dbms_backup_restore.applySetDatafile(check_logical => FALSE, cleanup => FALSE) ;

   DBMS_OUTPUT.put_line('After applySetDataFile');

   sys.dbms_backup_restore.applyDatafileTo(

     dfnumber => 5,

     toname => '/ora11204/app/oracle/oradata/O11204/datafile/o1_mf_ts_bb_da_gowptq5f_new.dbf',

     fuzziness_hint => 0, max_corrupt => 0, islevel0 => 0,

     recid => 0, stamp => 0);

   sys.dbms_backup_restore.applyDatafileTo(

     dfnumber => 6,

     toname => '/ora11204/app/oracle/oradata/O11204/datafile/o1_mf_ts_aa_da_gowq48kp_new.dbf',

     fuzziness_hint => 0, max_corrupt => 0, islevel0 => 0,

     recid => 0, stamp => 0);

  DBMS_OUTPUT.put_line('Done: applyDataFileTo');

  -- Restore Set Piece

  sys.dbms_backup_restore.restoreSetPiece(

    handle => '/home/ora11204/xtts/rmancopyincr/xtts_incr_0au9ubnp_1_1_conv_1',

    tag => null, fromdisk => true, recid => 0, stamp => 0) ;

  sys.dbms_backup_restore.restoreSetPiece(

    handle => '/home/ora11204/xtts/rmancopyincr/xtts_incr_0bu9ubo0_1_1_conv_1',

    tag => null, fromdisk => true, recid => 0, stamp => 0) ;

  DBMS_OUTPUT.put_line('Done: RestoreSetPiece');

  -- Restore Backup Piece

  sys.dbms_backup_restore.restoreBackupPiece(

    done => done, params => null, outhandle => outhandle,outtag => outtag, failover => failover);

  DBMS_OUTPUT.put_line('Done: RestoreBackupPiece');

  END;

  /

  exit

ERROR at line 1:

ORA-19624: operation failed, retry possible

ORA-19870: error while restoring backup piece

/home/ora11204/xtts/rmancopyincr/xtts_incr_05u9u9dh_1_1_conv_1

ORA-19609: /home/ora11204/xtts/rmancopyincr/xtts_incr_05u9u9dh_1_1_conv_1 is

from different backup set: stamp 1017062833 count 5

ORA-06512: at "SYS.DBMS_BACKUP_RESTORE", line 2421

ORA-06512: at line 45

上述报错可能跟增量备份时开的channel有关，开一个通道偶尔也不会报错。