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What is meant by Redo Log file mirroring ? How it can be achieved?
 
Process of having a copy of redo log files is called mirroring.
 
This  can be achieved by creating group of log files together, so that LGWR will  automatically  writes  them to all the members of the current on-line redo  log  group. If any one group fails then database automatically switch over to next group. It degrades performance.



  
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 The  System   Global  Area  in  a  Oracle database is the area in memory to facilitates  the  transfer  of information between users. It holds the 
 Number  of  times processes repeatedly query the dictionary table is called recursive  hints.  It  is due to the data dictionary cache is too small. By increasing the SHARED_POOL_SIZE 

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