Database - RAC/Scalability (MOSC)

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enq: SQ - contention spike high

edited Dec 3, 2013 3:32AM in Database - RAC/Scalability (MOSC) 7 commentsAnswered
Dear All,

In my database that I handled, there were high spike related to below wait event (I collected this from ASH reports)
EventEvent Class% EventAvg Active Sessions enq: SQ - contentionConfiguration51.7925.79 log file switch (checkpoint incomplete)Configuration21.1310.52 enq: TX - allocate ITL entryConfiguration15.467.70 enq: HW - contentionConfiguration11.525.74
my question are,
1) what is the solution for this enq: SQ - contention, is increasing the cache size solve this problem or is there any better action plan to solve this issue ? currently cache size value for this sequeunce is 20.
2) related log file switch (checkpoint incomplete), do i need to add more log file or do i need to increase the size of log file or this matters of I/O ?

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