第45题-OCP最新题库062认证考试原题解析
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我要咨询2018年的时候，OCP 11g考试题库大更新，052 053出现了很多新题，
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QUESTION 45
You notice a high number of waits for t he db file scattered read and db file sequential read events in t he recent Automatic Database Diagnostic Monitor (ADDM) report. After further investigation, you f ind that queries are performing too many full table scans and indexes are not being used even though the filter columns are indexed.
Identify three possible reasons for this.
A. Missing or stale histogram statistics
B. Undersized shared pool
C. High clustering factor for the indexes
D. High value for the DB_FILE_MULTIBLOCK_READ_COUNT parameter
E. Oversized buffer cache
Correct Answer: ACD
