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Oracle10g Grid Computing with RAC
Chapter 12 - RAC Design Considerations

Proper Sequence Usage

BEGIN
 select
    INSTANCE_NUMBER INTO INST_ID
  FROM
    V$INSTANCE;
  select
    EMP_ID_SEQ.NEXTVAL INTO SEQ_NUM
  FROM
    DUAL;
  INST_SEQ_ID:=(INST_ID-1)*100000 + SEQ_NUM;
  :NEW.EMP_ID:=INST_SEQ_ID;
END;.

Figure 13.5: Example Staggered Sequence Trigger

Generally, sequences can be cached with cache values as high as 200 in RAC. This is much higher than for a regular Oracle instance. If there is insufficient caching, then contention can result which will show up as an increase in service times. If there are performance problems due to sequences, then examine the row cache locks statistics in the v$system_eventview to determine whether the problem is due to the use of Oracle sequences. This is discussed in the following points:


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