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Oracle: administrative waits

Administrative waits should be rare and only caused by actions taken by the DBA such as rebuilding indexes, switching log files or changing the size or the buffer cache.

alter rbs offline                             
buffer pool resize                                                   
index (re)build online cleanup             
index (re)build online merge              
index (re)build online start             
switch logfile command                  
switch undo - offline                 
wait for possible quiesce finish