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RAC Design Considerations

Proper Sequence Usage

  • A problem with sequences is indicated in a v$system_event as an extended average wait time for row cache locks in the range of a few hundred milliseconds. The proportion of time waiting for row cache locks to the total time waiting for non-idle events will be relatively high.
     

  • In the v$rowcache view, for the dc_sequences parameter, the ratio of dlm_conflicts to dlm_requests will be high. If this ratio exceeds 10 to 15%, and the row cache lock wait time is a significant portion of the total wait time, then it is likely that the service time deterioration is due to insufficiently cached sequences. For example:

SQL> col parameter format a15
SQL> select parameter, dlm_conflicts
, dlm_requests, dlm_conflicts/dlm_requests ratio
   2 from v$rowcache
   3 where dlm_requests>0;

PARAMETER        DLM_CONFLICTS   DLM_REQUESTS         RATIO
--------------- -------------- --------------   -----------
dc_sequences                 0              2             0


For more information, see the book Oracle 11g Grid and Real Application Clusters 30% off if you buy it directly from Rampant TechPress . 

Written by top Oracle experts, this RAC book has a complete online code depot with ready to use RAC scripts.


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