Redo allocation hits
                                                 Last update (2008-04-15 11:23:41)
                                                                                                                   Date added (2008-04-10 15:54:38)

Summary
The Redo Allocation Hit % displays the percentages of redo allocation hits and redo allocation misses for the database instance. Must be close to 99% for optimal performance.
SELECT ROUND(((gets+immediate_gets)/(gets+immediate_gets+misses+immediate_misses)) *100,2) "Redo Alloc Hit%"
  FROM v$latch WHERE NAME = 'redo allocation';
Redo buffer allocation retries ratio must be close to 1%
SELECT ROUND(a.VALUE/(b.VALUE+0.0001)*100,2) "REDO ALLOCATION RETRIES RATIO"
  FROM v$sysstat a, v$sysstat b
 WHERE a.NAME = 'redo buffer allocation retries'
   AND b.NAME = 'redo writes';
Redo buffer SPACE request must be close to 0.02%
SELECT ROUND(a.VALUE/(b.VALUE+0.0001)*100,4) "REDO SPACE REQUEST RATIO"
  FROM v$sysstat a, v$sysstat b
 WHERE a.NAME = 'redo log space requests'
   AND b.NAME = 'redo entries';
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