诊断Oracle RMAN备份慢的原因

㈠ 先在系统层面查询CPU、IO使用情况：top、iostat、sar...等

㈡ EXEC DBMS_WORKLOAD_REPOSITORY.CREATE_SNAPSHOT();

㈢ rman target / debug trace =/tmp/rmandebug.txt log=/tmp/rman_log20130727.txt

执行备份

㈣ EXEC DBMS_WORKLOAD_REPOSITORY.CREATE_SNAPSHOT();

㈤ 查询v$backup_datafile

set markup html on
set echo on
set pages 80
set lines 180
set NUMFORMAT 99999999999999999
spool rman_bak20130727.html
select file# fno,used_change_tracking bct,incremental_level incr,
      incremental_change#,checkpoint_change#,datafile_blocks blks,
      block_size ,blocks_read, round((blocks_read/datafile_blocks)*100,2)"%READ",
      blocks,round((blocks/datafile_blocks)*100,2) "%WRTN",
      to_char(comletion_time,'yyyy-mm-dd hh24:mi:ss')
  from v$backup_datafile
order by file#,comletion_time;
spool off
set markup html off

推荐阅读：