1Z0-033 Oracle9i:Performance Tunning
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Demo Question 10.
What answer below is the best for the number of latches Oracle will need:
A. (PHYRDS * PHYBLKRD + PHYWRTS * PHYBLKWRT) / 2
B. (IMMEDIATE_GETS - IMMEDIATE_MISSES) / 2
C. (IMMEDIATE_GETS - IMMEDIATE_MISSES + GETS - MISSES) / 4
D. Oracle will examine the values and automatically decide the best match for number of latches.
Display Answer
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Answer: D
Do not tune latches. If you see latch contention, then it is a symptom of a part of SGA
experiencing abnormal resource usage. Latches control access with certain assumptions
(for example, a cursor is parsed once and executed many times). To fix the problem,
examine the resource usage for the parts of SGA experiencing contention. Merely
looking at V$LATCH does not address the problem.
Oracle 9i Performance Tuning Guide and Reference
Oracle 9i Database Tuning with the Tuning Pack
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